src/main/java/net/pterodactylus/sone/core/Core.java

   1 /*
   2  * Sone - Core.java - Copyright © 2010–2016 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.core;
  19
  20 import static com.google.common.base.Optional.fromNullable;
  21 import static com.google.common.base.Preconditions.checkArgument;
  22 import static com.google.common.base.Preconditions.checkNotNull;
  23 import static com.google.common.primitives.Longs.tryParse;
  24 import static java.lang.String.format;
  25 import static java.util.logging.Level.WARNING;
  26 import static java.util.logging.Logger.getLogger;
  27
  28 import java.util.ArrayList;
  29 import java.util.Collection;
  30 import java.util.HashMap;
  31 import java.util.HashSet;
  32 import java.util.List;
  33 import java.util.Map;
  34 import java.util.Map.Entry;
  35 import java.util.Set;
  36 import java.util.concurrent.ExecutorService;
  37 import java.util.concurrent.Executors;
  38 import java.util.concurrent.ScheduledExecutorService;
  39 import java.util.concurrent.TimeUnit;
  40 import java.util.logging.Level;
  41 import java.util.logging.Logger;
  42
  43 import javax.annotation.Nonnull;
  44 import javax.annotation.Nullable;
  45
  46 import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidAlbumFound;
  47 import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidImageFound;
  48 import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidParentAlbumFound;
  49 import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidPostFound;
  50 import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidPostReplyFound;
  51 import net.pterodactylus.sone.core.SoneChangeDetector.PostProcessor;
  52 import net.pterodactylus.sone.core.SoneChangeDetector.PostReplyProcessor;
  53 import net.pterodactylus.sone.core.event.ImageInsertFinishedEvent;
  54 import net.pterodactylus.sone.core.event.InsertionDelayChangedEvent;
  55 import net.pterodactylus.sone.core.event.MarkPostKnownEvent;
  56 import net.pterodactylus.sone.core.event.MarkPostReplyKnownEvent;
  57 import net.pterodactylus.sone.core.event.MarkSoneKnownEvent;
  58 import net.pterodactylus.sone.core.event.NewPostFoundEvent;
  59 import net.pterodactylus.sone.core.event.NewPostReplyFoundEvent;
  60 import net.pterodactylus.sone.core.event.NewSoneFoundEvent;
  61 import net.pterodactylus.sone.core.event.PostRemovedEvent;
  62 import net.pterodactylus.sone.core.event.PostReplyRemovedEvent;
  63 import net.pterodactylus.sone.core.event.SoneLockedEvent;
  64 import net.pterodactylus.sone.core.event.SoneRemovedEvent;
  65 import net.pterodactylus.sone.core.event.SoneUnlockedEvent;
  66 import net.pterodactylus.sone.data.Album;
  67 import net.pterodactylus.sone.data.Client;
  68 import net.pterodactylus.sone.data.Image;
  69 import net.pterodactylus.sone.data.Post;
  70 import net.pterodactylus.sone.data.PostReply;
  71 import net.pterodactylus.sone.data.Profile;
  72 import net.pterodactylus.sone.data.Profile.Field;
  73 import net.pterodactylus.sone.data.Reply;
  74 import net.pterodactylus.sone.data.Sone;
  75 import net.pterodactylus.sone.data.Sone.SoneStatus;
  76 import net.pterodactylus.sone.data.SoneOptions.LoadExternalContent;
  77 import net.pterodactylus.sone.data.TemporaryImage;
  78 import net.pterodactylus.sone.database.AlbumBuilder;
  79 import net.pterodactylus.sone.database.Database;
  80 import net.pterodactylus.sone.database.DatabaseException;
  81 import net.pterodactylus.sone.database.ImageBuilder;
  82 import net.pterodactylus.sone.database.PostBuilder;
  83 import net.pterodactylus.sone.database.PostProvider;
  84 import net.pterodactylus.sone.database.PostReplyBuilder;
  85 import net.pterodactylus.sone.database.PostReplyProvider;
  86 import net.pterodactylus.sone.database.SoneBuilder;
  87 import net.pterodactylus.sone.database.SoneProvider;
  88 import net.pterodactylus.sone.freenet.wot.Identity;
  89 import net.pterodactylus.sone.freenet.wot.IdentityManager;
  90 import net.pterodactylus.sone.freenet.wot.OwnIdentity;
  91 import net.pterodactylus.sone.freenet.wot.event.IdentityAddedEvent;
  92 import net.pterodactylus.sone.freenet.wot.event.IdentityRemovedEvent;
  93 import net.pterodactylus.sone.freenet.wot.event.IdentityUpdatedEvent;
  94 import net.pterodactylus.sone.freenet.wot.event.OwnIdentityAddedEvent;
  95 import net.pterodactylus.sone.freenet.wot.event.OwnIdentityRemovedEvent;
  96 import net.pterodactylus.sone.main.SonePlugin;
  97 import net.pterodactylus.util.config.Configuration;
  98 import net.pterodactylus.util.config.ConfigurationException;
  99 import net.pterodactylus.util.service.AbstractService;
 100 import net.pterodactylus.util.thread.NamedThreadFactory;
 101
 102 import com.google.common.annotations.VisibleForTesting;
 103 import com.google.common.base.Optional;
 104 import com.google.common.collect.FluentIterable;
 105 import com.google.common.collect.HashMultimap;
 106 import com.google.common.collect.Multimap;
 107 import com.google.common.collect.Multimaps;
 108 import com.google.common.eventbus.EventBus;
 109 import com.google.common.eventbus.Subscribe;
 110 import com.google.inject.Inject;
 111 import com.google.inject.Singleton;
 112 import kotlin.jvm.functions.Function1;
 113
 114 /**
 115  * The Sone core.
 116  */
 117 @Singleton
 118 public class Core extends AbstractService implements SoneProvider, PostProvider, PostReplyProvider {
 119
 120         /** The logger. */
 121         private static final Logger logger = getLogger(Core.class.getName());
 122
 123         /** The start time. */
 124         private final long startupTime = System.currentTimeMillis();
 125
 126         /** The preferences. */
 127         private final Preferences preferences;
 128
 129         /** The event bus. */
 130         private final EventBus eventBus;
 131
 132         /** The configuration. */
 133         private final Configuration configuration;
 134
 135         /** Whether we’re currently saving the configuration. */
 136         private boolean storingConfiguration = false;
 137
 138         /** The identity manager. */
 139         private final IdentityManager identityManager;
 140
 141         /** Interface to freenet. */
 142         private final FreenetInterface freenetInterface;
 143
 144         /** The Sone downloader. */
 145         private final SoneDownloader soneDownloader;
 146
 147         /** The image inserter. */
 148         private final ImageInserter imageInserter;
 149
 150         /** Sone downloader thread-pool. */
 151         private final ExecutorService soneDownloaders = Executors.newFixedThreadPool(10, new NamedThreadFactory("Sone Downloader %2$d"));
 152
 153         /** The update checker. */
 154         private final UpdateChecker updateChecker;
 155
 156         /** The trust updater. */
 157         private final WebOfTrustUpdater webOfTrustUpdater;
 158
 159         /** Locked local Sones. */
 160         /* synchronize on itself. */
 161         private final Set<Sone> lockedSones = new HashSet<Sone>();
 162
 163         /** Sone inserters. */
 164         /* synchronize access on this on sones. */
 165         private final Map<Sone, SoneInserter> soneInserters = new HashMap<Sone, SoneInserter>();
 166
 167         /** Sone rescuers. */
 168         /* synchronize access on this on sones. */
 169         private final Map<Sone, SoneRescuer> soneRescuers = new HashMap<Sone, SoneRescuer>();
 170
 171         /** All known Sones. */
 172         private final Set<String> knownSones = new HashSet<String>();
 173
 174         /** The post database. */
 175         private final Database database;
 176
 177         /** Trusted identities, sorted by own identities. */
 178         private final Multimap<OwnIdentity, Identity> trustedIdentities = Multimaps.synchronizedSetMultimap(HashMultimap.<OwnIdentity, Identity>create());
 179
 180         /** All temporary images. */
 181         private final Map<String, TemporaryImage> temporaryImages = new HashMap<String, TemporaryImage>();
 182
 183         /** Ticker for threads that mark own elements as known. */
 184         private final ScheduledExecutorService localElementTicker = Executors.newScheduledThreadPool(1);
 185
 186         /** The time the configuration was last touched. */
 187         private volatile long lastConfigurationUpdate;
 188
 189         /**
 190          * Creates a new core.
 191          *
 192          * @param configuration
 193          *            The configuration of the core
 194          * @param freenetInterface
 195          *            The freenet interface
 196          * @param identityManager
 197          *            The identity manager
 198          * @param webOfTrustUpdater
 199          *            The WebOfTrust updater
 200          * @param eventBus
 201          *            The event bus
 202          * @param database
 203          *            The database
 204          */
 205         @Inject
 206         public Core(Configuration configuration, FreenetInterface freenetInterface, IdentityManager identityManager, SoneDownloader soneDownloader, ImageInserter imageInserter, UpdateChecker updateChecker, WebOfTrustUpdater webOfTrustUpdater, EventBus eventBus, Database database) {
 207                 super("Sone Core");
 208                 this.configuration = configuration;
 209                 this.freenetInterface = freenetInterface;
 210                 this.identityManager = identityManager;
 211                 this.soneDownloader = soneDownloader;
 212                 this.imageInserter = imageInserter;
 213                 this.updateChecker = updateChecker;
 214                 this.webOfTrustUpdater = webOfTrustUpdater;
 215                 this.eventBus = eventBus;
 216                 this.database = database;
 217                 preferences = new Preferences(eventBus);
 218         }
 219
 220         //
 221         // ACCESSORS
 222         //
 223
 224         /**
 225          * Returns the time Sone was started.
 226          *
 227          * @return The startup time (in milliseconds since Jan 1, 1970 UTC)
 228          */
 229         public long getStartupTime() {
 230                 return startupTime;
 231         }
 232
 233         /**
 234          * Returns the options used by the core.
 235          *
 236          * @return The options of the core
 237          */
 238         public Preferences getPreferences() {
 239                 return preferences;
 240         }
 241
 242         /**
 243          * Returns the identity manager used by the core.
 244          *
 245          * @return The identity manager
 246          */
 247         public IdentityManager getIdentityManager() {
 248                 return identityManager;
 249         }
 250
 251         /**
 252          * Returns the update checker.
 253          *
 254          * @return The update checker
 255          */
 256         public UpdateChecker getUpdateChecker() {
 257                 return updateChecker;
 258         }
 259
 260         /**
 261          * Returns the Sone rescuer for the given local Sone.
 262          *
 263          * @param sone
 264          *            The local Sone to get the rescuer for
 265          * @return The Sone rescuer for the given Sone
 266          */
 267         public SoneRescuer getSoneRescuer(Sone sone) {
 268                 checkNotNull(sone, "sone must not be null");
 269                 checkArgument(sone.isLocal(), "sone must be local");
 270                 synchronized (soneRescuers) {
 271                         SoneRescuer soneRescuer = soneRescuers.get(sone);
 272                         if (soneRescuer == null) {
 273                                 soneRescuer = new SoneRescuer(this, soneDownloader, sone);
 274                                 soneRescuers.put(sone, soneRescuer);
 275                                 soneRescuer.start();
 276                         }
 277                         return soneRescuer;
 278                 }
 279         }
 280
 281         /**
 282          * Returns whether the given Sone is currently locked.
 283          *
 284          * @param sone
 285          *            The sone to check
 286          * @return {@code true} if the Sone is locked, {@code false} if it is not
 287          */
 288         public boolean isLocked(Sone sone) {
 289                 synchronized (lockedSones) {
 290                         return lockedSones.contains(sone);
 291                 }
 292         }
 293
 294         public SoneBuilder soneBuilder() {
 295                 return database.newSoneBuilder();
 296         }
 297
 298         /**
 299          * {@inheritDocs}
 300          */
 301         @Nonnull
 302         @Override
 303         public Collection<Sone> getSones() {
 304                 return database.getSones();
 305         }
 306
 307         @Nonnull
 308         @Override
 309         public Function1<String, Sone> getSoneLoader() {
 310                 return database.getSoneLoader();
 311         }
 312
 313         /**
 314          * Returns the Sone with the given ID, regardless whether it’s local or
 315          * remote.
 316          *
 317          * @param id
 318          *            The ID of the Sone to get
 319          * @return The Sone with the given ID, or {@code null} if there is no such
 320          *         Sone
 321          */
 322         @Override
 323         @Nullable
 324         public Sone getSone(@Nonnull String id) {
 325                 return database.getSone(id);
 326         }
 327
 328         /**
 329          * {@inheritDocs}
 330          */
 331         @Override
 332         public Collection<Sone> getLocalSones() {
 333                 return database.getLocalSones();
 334         }
 335
 336         /**
 337          * Returns the local Sone with the given ID, optionally creating a new Sone.
 338          *
 339          * @param id
 340          *            The ID of the Sone
 341          * @return The Sone with the given ID, or {@code null}
 342          */
 343         public Sone getLocalSone(String id) {
 344                 Sone sone = database.getSone(id);
 345                 if ((sone != null) && sone.isLocal()) {
 346                         return sone;
 347                 }
 348                 return null;
 349         }
 350
 351         /**
 352          * {@inheritDocs}
 353          */
 354         @Override
 355         public Collection<Sone> getRemoteSones() {
 356                 return database.getRemoteSones();
 357         }
 358
 359         /**
 360          * Returns the remote Sone with the given ID.
 361          *
 362          *
 363          * @param id
 364          *            The ID of the remote Sone to get
 365          * @return The Sone with the given ID
 366          */
 367         public Sone getRemoteSone(String id) {
 368                 return database.getSone(id);
 369         }
 370
 371         /**
 372          * Returns whether the given Sone has been modified.
 373          *
 374          * @param sone
 375          *            The Sone to check for modifications
 376          * @return {@code true} if a modification has been detected in the Sone,
 377          *         {@code false} otherwise
 378          */
 379         public boolean isModifiedSone(Sone sone) {
 380                 return soneInserters.containsKey(sone) && soneInserters.get(sone).isModified();
 381         }
 382
 383         /**
 384          * Returns a post builder.
 385          *
 386          * @return A new post builder
 387          */
 388         public PostBuilder postBuilder() {
 389                 return database.newPostBuilder();
 390         }
 391
 392         @Nullable
 393         @Override
 394         public Post getPost(@Nonnull String postId) {
 395                 return database.getPost(postId);
 396         }
 397
 398         /**
 399          * {@inheritDocs}
 400          */
 401         @Override
 402         public Collection<Post> getPosts(String soneId) {
 403                 return database.getPosts(soneId);
 404         }
 405
 406         /**
 407          * {@inheritDoc}
 408          */
 409         @Override
 410         public Collection<Post> getDirectedPosts(final String recipientId) {
 411                 checkNotNull(recipientId, "recipient must not be null");
 412                 return database.getDirectedPosts(recipientId);
 413         }
 414
 415         /**
 416          * Returns a post reply builder.
 417          *
 418          * @return A new post reply builder
 419          */
 420         public PostReplyBuilder postReplyBuilder() {
 421                 return database.newPostReplyBuilder();
 422         }
 423
 424         /**
 425          * {@inheritDoc}
 426          */
 427         @Nullable
 428         @Override
 429         public PostReply getPostReply(String replyId) {
 430                 return database.getPostReply(replyId);
 431         }
 432
 433         /**
 434          * {@inheritDoc}
 435          */
 436         @Override
 437         public List<PostReply> getReplies(final String postId) {
 438                 return database.getReplies(postId);
 439         }
 440
 441         /**
 442          * Returns all Sones that have liked the given post.
 443          *
 444          * @param post
 445          *            The post to get the liking Sones for
 446          * @return The Sones that like the given post
 447          */
 448         public Set<Sone> getLikes(Post post) {
 449                 Set<Sone> sones = new HashSet<Sone>();
 450                 for (Sone sone : getSones()) {
 451                         if (sone.getLikedPostIds().contains(post.getId())) {
 452                                 sones.add(sone);
 453                         }
 454                 }
 455                 return sones;
 456         }
 457
 458         /**
 459          * Returns all Sones that have liked the given reply.
 460          *
 461          * @param reply
 462          *            The reply to get the liking Sones for
 463          * @return The Sones that like the given reply
 464          */
 465         public Set<Sone> getLikes(PostReply reply) {
 466                 Set<Sone> sones = new HashSet<Sone>();
 467                 for (Sone sone : getSones()) {
 468                         if (sone.getLikedReplyIds().contains(reply.getId())) {
 469                                 sones.add(sone);
 470                         }
 471                 }
 472                 return sones;
 473         }
 474
 475         /**
 476          * Returns whether the given post is bookmarked.
 477          *
 478          * @param post
 479          *            The post to check
 480          * @return {@code true} if the given post is bookmarked, {@code false}
 481          *         otherwise
 482          */
 483         public boolean isBookmarked(Post post) {
 484                 return database.isPostBookmarked(post);
 485         }
 486
 487         /**
 488          * Returns all currently known bookmarked posts.
 489          *
 490          * @return All bookmarked posts
 491          */
 492         public Set<Post> getBookmarkedPosts() {
 493                 return database.getBookmarkedPosts();
 494         }
 495
 496         public AlbumBuilder albumBuilder() {
 497                 return database.newAlbumBuilder();
 498         }
 499
 500         /**
 501          * Returns the album with the given ID, optionally creating a new album if
 502          * an album with the given ID can not be found.
 503          *
 504          * @param albumId
 505          *            The ID of the album
 506          * @return The album with the given ID, or {@code null} if no album with the
 507          *         given ID exists
 508          */
 509         @Nullable
 510         public Album getAlbum(@Nonnull String albumId) {
 511                 return database.getAlbum(albumId);
 512         }
 513
 514         public ImageBuilder imageBuilder() {
 515                 return database.newImageBuilder();
 516         }
 517
 518         /**
 519          * Returns the image with the given ID, creating it if necessary.
 520          *
 521          * @param imageId
 522          *            The ID of the image
 523          * @return The image with the given ID
 524          */
 525         @Nullable
 526         public Image getImage(String imageId) {
 527                 return getImage(imageId, true);
 528         }
 529
 530         /**
 531          * Returns the image with the given ID, optionally creating it if it does
 532          * not exist.
 533          *
 534          * @param imageId
 535          *            The ID of the image
 536          * @param create
 537          *            {@code true} to create an image if none exists with the given
 538          *            ID
 539          * @return The image with the given ID, or {@code null} if none exists and
 540          *         none was created
 541          */
 542         @Nullable
 543         public Image getImage(String imageId, boolean create) {
 544                 Image image = database.getImage(imageId);
 545                 if (image != null) {
 546                         return image;
 547                 }
 548                 if (!create) {
 549                         return null;
 550                 }
 551                 Image newImage = database.newImageBuilder().withId(imageId).build();
 552                 database.storeImage(newImage);
 553                 return newImage;
 554         }
 555
 556         /**
 557          * Returns the temporary image with the given ID.
 558          *
 559          * @param imageId
 560          *            The ID of the temporary image
 561          * @return The temporary image, or {@code null} if there is no temporary
 562          *         image with the given ID
 563          */
 564         public TemporaryImage getTemporaryImage(String imageId) {
 565                 synchronized (temporaryImages) {
 566                         return temporaryImages.get(imageId);
 567                 }
 568         }
 569
 570         //
 571         // ACTIONS
 572         //
 573
 574         /**
 575          * Locks the given Sone. A locked Sone will not be inserted by
 576          * {@link SoneInserter} until it is {@link #unlockSone(Sone) unlocked}
 577          * again.
 578          *
 579          * @param sone
 580          *            The sone to lock
 581          */
 582         public void lockSone(Sone sone) {
 583                 synchronized (lockedSones) {
 584                         if (lockedSones.add(sone)) {
 585                                 eventBus.post(new SoneLockedEvent(sone));
 586                         }
 587                 }
 588         }
 589
 590         /**
 591          * Unlocks the given Sone.
 592          *
 593          * @see #lockSone(Sone)
 594          * @param sone
 595          *            The sone to unlock
 596          */
 597         public void unlockSone(Sone sone) {
 598                 synchronized (lockedSones) {
 599                         if (lockedSones.remove(sone)) {
 600                                 eventBus.post(new SoneUnlockedEvent(sone));
 601                         }
 602                 }
 603         }
 604
 605         /**
 606          * Adds a local Sone from the given own identity.
 607          *
 608          * @param ownIdentity
 609          *            The own identity to create a Sone from
 610          * @return The added (or already existing) Sone
 611          */
 612         public Sone addLocalSone(OwnIdentity ownIdentity) {
 613                 if (ownIdentity == null) {
 614                         logger.log(Level.WARNING, "Given OwnIdentity is null!");
 615                         return null;
 616                 }
 617                 logger.info(String.format("Adding Sone from OwnIdentity: %s", ownIdentity));
 618                 Sone sone = database.newSoneBuilder().local().from(ownIdentity).build();
 619                 String property = fromNullable(ownIdentity.getProperty("Sone.LatestEdition")).or("0");
 620                 sone.setLatestEdition(fromNullable(tryParse(property)).or(0L));
 621                 sone.setClient(new Client("Sone", SonePlugin.getPluginVersion()));
 622                 sone.setKnown(true);
 623                 SoneInserter soneInserter = new SoneInserter(this, eventBus, freenetInterface, ownIdentity.getId());
 624                 soneInserter.insertionDelayChanged(new InsertionDelayChangedEvent(preferences.getInsertionDelay()));
 625                 eventBus.register(soneInserter);
 626                 synchronized (soneInserters) {
 627                         soneInserters.put(sone, soneInserter);
 628                 }
 629                 loadSone(sone);
 630                 database.storeSone(sone);
 631                 sone.setStatus(SoneStatus.idle);
 632                 soneInserter.start();
 633                 return sone;
 634         }
 635
 636         /**
 637          * Creates a new Sone for the given own identity.
 638          *
 639          * @param ownIdentity
 640          *            The own identity to create a Sone for
 641          * @return The created Sone
 642          */
 643         public Sone createSone(OwnIdentity ownIdentity) {
 644                 if (!webOfTrustUpdater.addContextWait(ownIdentity, "Sone")) {
 645                         logger.log(Level.SEVERE, String.format("Could not add “Sone” context to own identity: %s", ownIdentity));
 646                         return null;
 647                 }
 648                 Sone sone = addLocalSone(ownIdentity);
 649
 650                 followSone(sone, "nwa8lHa271k2QvJ8aa0Ov7IHAV-DFOCFgmDt3X6BpCI");
 651                 touchConfiguration();
 652                 return sone;
 653         }
 654
 655         /**
 656          * Adds the Sone of the given identity.
 657          *
 658          * @param identity
 659          *            The identity whose Sone to add
 660          * @return The added or already existing Sone
 661          */
 662         public Sone addRemoteSone(Identity identity) {
 663                 if (identity == null) {
 664                         logger.log(Level.WARNING, "Given Identity is null!");
 665                         return null;
 666                 }
 667                 String property = fromNullable(identity.getProperty("Sone.LatestEdition")).or("0");
 668                 long latestEdition = fromNullable(tryParse(property)).or(0L);
 669                 Sone existingSone = getSone(identity.getId());
 670                 if ((existingSone != null )&& existingSone.isLocal()) {
 671                         return existingSone;
 672                 }
 673                 boolean newSone = existingSone == null;
 674                 Sone sone = !newSone ? existingSone : database.newSoneBuilder().from(identity).build();
 675                 sone.setLatestEdition(latestEdition);
 676                 if (newSone) {
 677                         synchronized (knownSones) {
 678                                 newSone = !knownSones.contains(sone.getId());
 679                         }
 680                         sone.setKnown(!newSone);
 681                         if (newSone) {
 682                                 eventBus.post(new NewSoneFoundEvent(sone));
 683                                 for (Sone localSone : getLocalSones()) {
 684                                         if (localSone.getOptions().isAutoFollow()) {
 685                                                 followSone(localSone, sone.getId());
 686                                         }
 687                                 }
 688                         }
 689                 }
 690                 database.storeSone(sone);
 691                 soneDownloader.addSone(sone);
 692                 soneDownloaders.execute(soneDownloader.fetchSoneAsUskAction(sone));
 693                 return sone;
 694         }
 695
 696         /**
 697          * Lets the given local Sone follow the Sone with the given ID.
 698          *
 699          * @param sone
 700          *            The local Sone that should follow another Sone
 701          * @param soneId
 702          *            The ID of the Sone to follow
 703          */
 704         public void followSone(Sone sone, String soneId) {
 705                 checkNotNull(sone, "sone must not be null");
 706                 checkNotNull(soneId, "soneId must not be null");
 707                 database.addFriend(sone, soneId);
 708                 @SuppressWarnings("ConstantConditions") // we just followed, this can’t be null.
 709                 long now = database.getFollowingTime(soneId);
 710                 Sone followedSone = getSone(soneId);
 711                 if (followedSone == null) {
 712                         return;
 713                 }
 714                 for (Post post : followedSone.getPosts()) {
 715                         if (post.getTime() < now) {
 716                                 markPostKnown(post);
 717                         }
 718                 }
 719                 for (PostReply reply : followedSone.getReplies()) {
 720                         if (reply.getTime() < now) {
 721                                 markReplyKnown(reply);
 722                         }
 723                 }
 724                 touchConfiguration();
 725         }
 726
 727         /**
 728          * Lets the given local Sone unfollow the Sone with the given ID.
 729          *
 730          * @param sone
 731          *            The local Sone that should unfollow another Sone
 732          * @param soneId
 733          *            The ID of the Sone being unfollowed
 734          */
 735         public void unfollowSone(Sone sone, String soneId) {
 736                 checkNotNull(sone, "sone must not be null");
 737                 checkNotNull(soneId, "soneId must not be null");
 738                 database.removeFriend(sone, soneId);
 739                 touchConfiguration();
 740         }
 741
 742         /**
 743          * Sets the trust value of the given origin Sone for the target Sone.
 744          *
 745          * @param origin
 746          *            The origin Sone
 747          * @param target
 748          *            The target Sone
 749          * @param trustValue
 750          *            The trust value (from {@code -100} to {@code 100})
 751          */
 752         public void setTrust(Sone origin, Sone target, int trustValue) {
 753                 checkNotNull(origin, "origin must not be null");
 754                 checkArgument(origin.getIdentity() instanceof OwnIdentity, "origin must be a local Sone");
 755                 checkNotNull(target, "target must not be null");
 756                 checkArgument((trustValue >= -100) && (trustValue <= 100), "trustValue must be within [-100, 100]");
 757                 webOfTrustUpdater.setTrust((OwnIdentity) origin.getIdentity(), target.getIdentity(), trustValue, preferences.getTrustComment());
 758         }
 759
 760         /**
 761          * Removes any trust assignment for the given target Sone.
 762          *
 763          * @param origin
 764          *            The trust origin
 765          * @param target
 766          *            The trust target
 767          */
 768         public void removeTrust(Sone origin, Sone target) {
 769                 checkNotNull(origin, "origin must not be null");
 770                 checkNotNull(target, "target must not be null");
 771                 checkArgument(origin.getIdentity() instanceof OwnIdentity, "origin must be a local Sone");
 772                 webOfTrustUpdater.setTrust((OwnIdentity) origin.getIdentity(), target.getIdentity(), null, null);
 773         }
 774
 775         /**
 776          * Assigns the configured positive trust value for the given target.
 777          *
 778          * @param origin
 779          *            The trust origin
 780          * @param target
 781          *            The trust target
 782          */
 783         public void trustSone(Sone origin, Sone target) {
 784                 setTrust(origin, target, preferences.getPositiveTrust());
 785         }
 786
 787         /**
 788          * Assigns the configured negative trust value for the given target.
 789          *
 790          * @param origin
 791          *            The trust origin
 792          * @param target
 793          *            The trust target
 794          */
 795         public void distrustSone(Sone origin, Sone target) {
 796                 setTrust(origin, target, preferences.getNegativeTrust());
 797         }
 798
 799         /**
 800          * Removes the trust assignment for the given target.
 801          *
 802          * @param origin
 803          *            The trust origin
 804          * @param target
 805          *            The trust target
 806          */
 807         public void untrustSone(Sone origin, Sone target) {
 808                 removeTrust(origin, target);
 809         }
 810
 811         /**
 812          * Updates the stored Sone with the given Sone.
 813          *
 814          * @param sone
 815          *            The updated Sone
 816          */
 817         public void updateSone(Sone sone) {
 818                 updateSone(sone, false);
 819         }
 820
 821         /**
 822          * Updates the stored Sone with the given Sone. If {@code soneRescueMode} is
 823          * {@code true}, an older Sone than the current Sone can be given to restore
 824          * an old state.
 825          *
 826          * @param sone
 827          *            The Sone to update
 828          * @param soneRescueMode
 829          *            {@code true} if the stored Sone should be updated regardless
 830          *            of the age of the given Sone
 831          */
 832         public void updateSone(final Sone sone, boolean soneRescueMode) {
 833                 Sone storedSone = getSone(sone.getId());
 834                 if (storedSone != null) {
 835                         if (!soneRescueMode && !(sone.getTime() > storedSone.getTime())) {
 836                                 logger.log(Level.FINE, String.format("Downloaded Sone %s is not newer than stored Sone %s.", sone, storedSone));
 837                                 return;
 838                         }
 839                         List<Object> events =
 840                                         collectEventsForChangesInSone(storedSone, sone);
 841                         database.storeSone(sone);
 842                         for (Object event : events) {
 843                                 eventBus.post(event);
 844                         }
 845                         sone.setOptions(storedSone.getOptions());
 846                         sone.setKnown(storedSone.isKnown());
 847                         sone.setStatus((sone.getTime() == 0) ? SoneStatus.unknown : SoneStatus.idle);
 848                         if (sone.isLocal()) {
 849                                 touchConfiguration();
 850                         }
 851                 }
 852         }
 853
 854         private List<Object> collectEventsForChangesInSone(Sone oldSone,
 855                         final Sone newSone) {
 856                 final List<Object> events = new ArrayList<Object>();
 857                 SoneChangeDetector soneChangeDetector = new SoneChangeDetector(
 858                                 oldSone);
 859                 soneChangeDetector.onNewPosts(new PostProcessor() {
 860                         @Override
 861                         public void processPost(Post post) {
 862                                 if (post.getTime() < database.getFollowingTime(newSone.getId())) {
 863                                         post.setKnown(true);
 864                                 } else if (!post.isKnown()) {
 865                                         events.add(new NewPostFoundEvent(post));
 866                                 }
 867                         }
 868                 });
 869                 soneChangeDetector.onRemovedPosts(new PostProcessor() {
 870                         @Override
 871                         public void processPost(Post post) {
 872                                 events.add(new PostRemovedEvent(post));
 873                         }
 874                 });
 875                 soneChangeDetector.onNewPostReplies(new PostReplyProcessor() {
 876                         @Override
 877                         public void processPostReply(PostReply postReply) {
 878                                 if (postReply.getTime() < database.getFollowingTime(newSone.getId())) {
 879                                         postReply.setKnown(true);
 880                                 } else if (!postReply.isKnown()) {
 881                                         events.add(new NewPostReplyFoundEvent(postReply));
 882                                 }
 883                         }
 884                 });
 885                 soneChangeDetector.onRemovedPostReplies(new PostReplyProcessor() {
 886                         @Override
 887                         public void processPostReply(PostReply postReply) {
 888                                 events.add(new PostReplyRemovedEvent(postReply));
 889                         }
 890                 });
 891                 soneChangeDetector.detectChanges(newSone);
 892                 return events;
 893         }
 894
 895         /**
 896          * Deletes the given Sone. This will remove the Sone from the
 897          * {@link #getLocalSones() local Sones}, stop its {@link SoneInserter} and
 898          * remove the context from its identity.
 899          *
 900          * @param sone
 901          *            The Sone to delete
 902          */
 903         public void deleteSone(Sone sone) {
 904                 if (!(sone.getIdentity() instanceof OwnIdentity)) {
 905                         logger.log(Level.WARNING, String.format("Tried to delete Sone of non-own identity: %s", sone));
 906                         return;
 907                 }
 908                 if (!getLocalSones().contains(sone)) {
 909                         logger.log(Level.WARNING, String.format("Tried to delete non-local Sone: %s", sone));
 910                         return;
 911                 }
 912                 SoneInserter soneInserter = soneInserters.remove(sone);
 913                 soneInserter.stop();
 914                 database.removeSone(sone);
 915                 webOfTrustUpdater.removeContext((OwnIdentity) sone.getIdentity(), "Sone");
 916                 webOfTrustUpdater.removeProperty((OwnIdentity) sone.getIdentity(), "Sone.LatestEdition");
 917                 try {
 918                         configuration.getLongValue("Sone/" + sone.getId() + "/Time").setValue(null);
 919                 } catch (ConfigurationException ce1) {
 920                         logger.log(Level.WARNING, "Could not remove Sone from configuration!", ce1);
 921                 }
 922         }
 923
 924         /**
 925          * Marks the given Sone as known. If the Sone was not {@link Post#isKnown()
 926          * known} before, a {@link MarkSoneKnownEvent} is fired.
 927          *
 928          * @param sone
 929          *            The Sone to mark as known
 930          */
 931         public void markSoneKnown(Sone sone) {
 932                 if (!sone.isKnown()) {
 933                         sone.setKnown(true);
 934                         synchronized (knownSones) {
 935                                 knownSones.add(sone.getId());
 936                         }
 937                         eventBus.post(new MarkSoneKnownEvent(sone));
 938                         touchConfiguration();
 939                 }
 940         }
 941
 942         /**
 943          * Loads and updates the given Sone from the configuration. If any error is
 944          * encountered, loading is aborted and the given Sone is not changed.
 945          *
 946          * @param sone
 947          *            The Sone to load and update
 948          */
 949         public void loadSone(Sone sone) {
 950                 if (!sone.isLocal()) {
 951                         logger.log(Level.FINE, String.format("Tried to load non-local Sone: %s", sone));
 952                         return;
 953                 }
 954                 logger.info(String.format("Loading local Sone: %s", sone));
 955
 956                 /* load Sone. */
 957                 String sonePrefix = "Sone/" + sone.getId();
 958                 Long soneTime = configuration.getLongValue(sonePrefix + "/Time").getValue(null);
 959                 if (soneTime == null) {
 960                         logger.log(Level.INFO, "Could not load Sone because no Sone has been saved.");
 961                         return;
 962                 }
 963                 String lastInsertFingerprint = configuration.getStringValue(sonePrefix + "/LastInsertFingerprint").getValue("");
 964
 965                 /* load profile. */
 966                 ConfigurationSoneParser configurationSoneParser = new ConfigurationSoneParser(configuration, sone);
 967                 Profile profile = configurationSoneParser.parseProfile();
 968
 969                 /* load posts. */
 970                 Collection<Post> posts;
 971                 try {
 972                         posts = configurationSoneParser.parsePosts(database);
 973                 } catch (InvalidPostFound ipf) {
 974                         logger.log(Level.WARNING, "Invalid post found, aborting load!");
 975                         return;
 976                 }
 977
 978                 /* load replies. */
 979                 Collection<PostReply> replies;
 980                 try {
 981                         replies = configurationSoneParser.parsePostReplies(database);
 982                 } catch (InvalidPostReplyFound iprf) {
 983                         logger.log(Level.WARNING, "Invalid reply found, aborting load!");
 984                         return;
 985                 }
 986
 987                 /* load post likes. */
 988                 Set<String> likedPostIds =
 989                                 configurationSoneParser.parseLikedPostIds();
 990
 991                 /* load reply likes. */
 992                 Set<String> likedReplyIds =
 993                                 configurationSoneParser.parseLikedPostReplyIds();
 994
 995                 /* load albums. */
 996                 List<Album> topLevelAlbums;
 997                 try {
 998                         topLevelAlbums =
 999                                         configurationSoneParser.parseTopLevelAlbums(database);
1000                 } catch (InvalidAlbumFound iaf) {
1001                         logger.log(Level.WARNING, "Invalid album found, aborting load!");
1002                         return;
1003                 } catch (InvalidParentAlbumFound ipaf) {
1004                         logger.log(Level.WARNING, format("Invalid parent album ID: %s",
1005                                         ipaf.getAlbumParentId()));
1006                         return;
1007                 }
1008
1009                 /* load images. */
1010                 try {
1011                         configurationSoneParser.parseImages(database);
1012                 } catch (InvalidImageFound iif) {
1013                         logger.log(WARNING, "Invalid image found, aborting load!");
1014                         return;
1015                 } catch (InvalidParentAlbumFound ipaf) {
1016                         logger.log(Level.WARNING,
1017                                         format("Invalid album image (%s) encountered, aborting load!",
1018                                                         ipaf.getAlbumParentId()));
1019                         return;
1020                 }
1021
1022                 /* load avatar. */
1023                 String avatarId = configuration.getStringValue(sonePrefix + "/Profile/Avatar").getValue(null);
1024                 if (avatarId != null) {
1025                         final Map<String, Image> images =
1026                                         configurationSoneParser.getImages();
1027                         profile.setAvatar(images.get(avatarId));
1028                 }
1029
1030                 /* load options. */
1031                 sone.getOptions().setAutoFollow(configuration.getBooleanValue(sonePrefix + "/Options/AutoFollow").getValue(false));
1032                 sone.getOptions().setSoneInsertNotificationEnabled(configuration.getBooleanValue(sonePrefix + "/Options/EnableSoneInsertNotifications").getValue(false));
1033                 sone.getOptions().setShowNewSoneNotifications(configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewSones").getValue(true));
1034                 sone.getOptions().setShowNewPostNotifications(configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewPosts").getValue(true));
1035                 sone.getOptions().setShowNewReplyNotifications(configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewReplies").getValue(true));
1036                 sone.getOptions().setShowCustomAvatars(LoadExternalContent.valueOf(configuration.getStringValue(sonePrefix + "/Options/ShowCustomAvatars").getValue(LoadExternalContent.NEVER.name())));
1037                 sone.getOptions().setLoadLinkedImages(LoadExternalContent.valueOf(configuration.getStringValue(sonePrefix + "/Options/LoadLinkedImages").getValue(LoadExternalContent.NEVER.name())));
1038
1039                 /* if we’re still here, Sone was loaded successfully. */
1040                 synchronized (sone) {
1041                         sone.setTime(soneTime);
1042                         sone.setProfile(profile);
1043                         sone.setPosts(posts);
1044                         sone.setReplies(replies);
1045                         sone.setLikePostIds(likedPostIds);
1046                         sone.setLikeReplyIds(likedReplyIds);
1047                         for (Album album : sone.getRootAlbum().getAlbums()) {
1048                                 sone.getRootAlbum().removeAlbum(album);
1049                         }
1050                         for (Album album : topLevelAlbums) {
1051                                 sone.getRootAlbum().addAlbum(album);
1052                         }
1053                         synchronized (soneInserters) {
1054                                 soneInserters.get(sone).setLastInsertFingerprint(lastInsertFingerprint);
1055                         }
1056                 }
1057                 for (Post post : posts) {
1058                         post.setKnown(true);
1059                 }
1060                 for (PostReply reply : replies) {
1061                         reply.setKnown(true);
1062                 }
1063
1064                 logger.info(String.format("Sone loaded successfully: %s", sone));
1065         }
1066
1067         /**
1068          * Creates a new post.
1069          *
1070          * @param sone
1071          *            The Sone that creates the post
1072          * @param recipient
1073          *            The recipient Sone, or {@code null} if this post does not have
1074          *            a recipient
1075          * @param text
1076          *            The text of the post
1077          * @return The created post
1078          */
1079         public Post createPost(Sone sone, Optional<Sone> recipient, String text) {
1080                 checkNotNull(text, "text must not be null");
1081                 checkArgument(text.trim().length() > 0, "text must not be empty");
1082                 if (!sone.isLocal()) {
1083                         logger.log(Level.FINE, String.format("Tried to create post for non-local Sone: %s", sone));
1084                         return null;
1085                 }
1086                 PostBuilder postBuilder = database.newPostBuilder();
1087                 postBuilder.from(sone.getId()).randomId().currentTime().withText(text.trim());
1088                 if (recipient.isPresent()) {
1089                         postBuilder.to(recipient.get().getId());
1090                 }
1091                 final Post post = postBuilder.build();
1092                 database.storePost(post);
1093                 eventBus.post(new NewPostFoundEvent(post));
1094                 sone.addPost(post);
1095                 touchConfiguration();
1096                 localElementTicker.schedule(new MarkPostKnown(post), 10, TimeUnit.SECONDS);
1097                 return post;
1098         }
1099
1100         /**
1101          * Deletes the given post.
1102          *
1103          * @param post
1104          *            The post to delete
1105          */
1106         public void deletePost(Post post) {
1107                 if (!post.getSone().isLocal()) {
1108                         logger.log(Level.WARNING, String.format("Tried to delete post of non-local Sone: %s", post.getSone()));
1109                         return;
1110                 }
1111                 database.removePost(post);
1112                 eventBus.post(new PostRemovedEvent(post));
1113                 markPostKnown(post);
1114                 touchConfiguration();
1115         }
1116
1117         /**
1118          * Marks the given post as known, if it is currently not a known post
1119          * (according to {@link Post#isKnown()}).
1120          *
1121          * @param post
1122          *            The post to mark as known
1123          */
1124         public void markPostKnown(Post post) {
1125                 post.setKnown(true);
1126                 eventBus.post(new MarkPostKnownEvent(post));
1127                 touchConfiguration();
1128                 for (PostReply reply : getReplies(post.getId())) {
1129                         markReplyKnown(reply);
1130                 }
1131         }
1132
1133         public void bookmarkPost(Post post) {
1134                 database.bookmarkPost(post);
1135         }
1136
1137         /**
1138          * Removes the given post from the bookmarks.
1139          *
1140          * @param post
1141          *            The post to unbookmark
1142          */
1143         public void unbookmarkPost(Post post) {
1144                 database.unbookmarkPost(post);
1145         }
1146
1147         /**
1148          * Creates a new reply.
1149          *
1150          * @param sone
1151          *            The Sone that creates the reply
1152          * @param post
1153          *            The post that this reply refers to
1154          * @param text
1155          *            The text of the reply
1156          * @return The created reply
1157          */
1158         public PostReply createReply(Sone sone, Post post, String text) {
1159                 checkNotNull(text, "text must not be null");
1160                 checkArgument(text.trim().length() > 0, "text must not be empty");
1161                 if (!sone.isLocal()) {
1162                         logger.log(Level.FINE, String.format("Tried to create reply for non-local Sone: %s", sone));
1163                         return null;
1164                 }
1165                 PostReplyBuilder postReplyBuilder = postReplyBuilder();
1166                 postReplyBuilder.randomId().from(sone.getId()).to(post.getId()).currentTime().withText(text.trim());
1167                 final PostReply reply = postReplyBuilder.build();
1168                 database.storePostReply(reply);
1169                 eventBus.post(new NewPostReplyFoundEvent(reply));
1170                 sone.addReply(reply);
1171                 touchConfiguration();
1172                 localElementTicker.schedule(new MarkReplyKnown(reply), 10, TimeUnit.SECONDS);
1173                 return reply;
1174         }
1175
1176         /**
1177          * Deletes the given reply.
1178          *
1179          * @param reply
1180          *            The reply to delete
1181          */
1182         public void deleteReply(PostReply reply) {
1183                 Sone sone = reply.getSone();
1184                 if (!sone.isLocal()) {
1185                         logger.log(Level.FINE, String.format("Tried to delete non-local reply: %s", reply));
1186                         return;
1187                 }
1188                 database.removePostReply(reply);
1189                 markReplyKnown(reply);
1190                 sone.removeReply(reply);
1191                 touchConfiguration();
1192         }
1193
1194         /**
1195          * Marks the given reply as known, if it is currently not a known reply
1196          * (according to {@link Reply#isKnown()}).
1197          *
1198          * @param reply
1199          *            The reply to mark as known
1200          */
1201         public void markReplyKnown(PostReply reply) {
1202                 boolean previouslyKnown = reply.isKnown();
1203                 reply.setKnown(true);
1204                 eventBus.post(new MarkPostReplyKnownEvent(reply));
1205                 if (!previouslyKnown) {
1206                         touchConfiguration();
1207                 }
1208         }
1209
1210         /**
1211          * Creates a new album for the given Sone.
1212          *
1213          * @param sone
1214          *            The Sone to create the album for
1215          * @param parent
1216          *            The parent of the album (may be {@code null} to create a
1217          *            top-level album)
1218          * @return The new album
1219          */
1220         public Album createAlbum(Sone sone, Album parent) {
1221                 Album album = database.newAlbumBuilder().randomId().by(sone).build();
1222                 database.storeAlbum(album);
1223                 parent.addAlbum(album);
1224                 return album;
1225         }
1226
1227         /**
1228          * Deletes the given album. The owner of the album has to be a local Sone,
1229          * and the album has to be {@link Album#isEmpty() empty} to be deleted.
1230          *
1231          * @param album
1232          *            The album to remove
1233          */
1234         public void deleteAlbum(Album album) {
1235                 checkNotNull(album, "album must not be null");
1236                 checkArgument(album.getSone().isLocal(), "album’s Sone must be a local Sone");
1237                 if (!album.isEmpty()) {
1238                         return;
1239                 }
1240                 album.getParent().removeAlbum(album);
1241                 database.removeAlbum(album);
1242                 touchConfiguration();
1243         }
1244
1245         /**
1246          * Creates a new image.
1247          *
1248          * @param sone
1249          *            The Sone creating the image
1250          * @param album
1251          *            The album the image will be inserted into
1252          * @param temporaryImage
1253          *            The temporary image to create the image from
1254          * @return The newly created image
1255          */
1256         public Image createImage(Sone sone, Album album, TemporaryImage temporaryImage) {
1257                 checkNotNull(sone, "sone must not be null");
1258                 checkNotNull(album, "album must not be null");
1259                 checkNotNull(temporaryImage, "temporaryImage must not be null");
1260                 checkArgument(sone.isLocal(), "sone must be a local Sone");
1261                 checkArgument(sone.equals(album.getSone()), "album must belong to the given Sone");
1262                 Image image = database.newImageBuilder().withId(temporaryImage.getId()).build().modify().setSone(sone).setCreationTime(System.currentTimeMillis()).update();
1263                 album.addImage(image);
1264                 database.storeImage(image);
1265                 imageInserter.insertImage(temporaryImage, image);
1266                 return image;
1267         }
1268
1269         /**
1270          * Deletes the given image. This method will also delete a matching
1271          * temporary image.
1272          *
1273          * @see #deleteTemporaryImage(String)
1274          * @param image
1275          *            The image to delete
1276          */
1277         public void deleteImage(Image image) {
1278                 checkNotNull(image, "image must not be null");
1279                 checkArgument(image.getSone().isLocal(), "image must belong to a local Sone");
1280                 deleteTemporaryImage(image.getId());
1281                 image.getAlbum().removeImage(image);
1282                 database.removeImage(image);
1283                 touchConfiguration();
1284         }
1285
1286         /**
1287          * Creates a new temporary image.
1288          *
1289          * @param mimeType
1290          *            The MIME type of the temporary image
1291          * @param imageData
1292          *            The encoded data of the image
1293          * @return The temporary image
1294          */
1295         public TemporaryImage createTemporaryImage(String mimeType, byte[] imageData) {
1296                 TemporaryImage temporaryImage = new TemporaryImage();
1297                 temporaryImage.setMimeType(mimeType).setImageData(imageData);
1298                 synchronized (temporaryImages) {
1299                         temporaryImages.put(temporaryImage.getId(), temporaryImage);
1300                 }
1301                 return temporaryImage;
1302         }
1303
1304         /**
1305          * Deletes the temporary image with the given ID.
1306          *
1307          * @param imageId
1308          *            The ID of the temporary image to delete
1309          */
1310         public void deleteTemporaryImage(String imageId) {
1311                 checkNotNull(imageId, "imageId must not be null");
1312                 synchronized (temporaryImages) {
1313                         temporaryImages.remove(imageId);
1314                 }
1315                 Image image = getImage(imageId, false);
1316                 if (image != null) {
1317                         imageInserter.cancelImageInsert(image);
1318                 }
1319         }
1320
1321         /**
1322          * Notifies the core that the configuration, either of the core or of a
1323          * single local Sone, has changed, and that the configuration should be
1324          * saved.
1325          */
1326         public void touchConfiguration() {
1327                 lastConfigurationUpdate = System.currentTimeMillis();
1328         }
1329
1330         //
1331         // SERVICE METHODS
1332         //
1333
1334         /**
1335          * Starts the core.
1336          */
1337         @Override
1338         public void serviceStart() {
1339                 loadConfiguration();
1340                 updateChecker.start();
1341                 identityManager.start();
1342                 webOfTrustUpdater.init();
1343                 webOfTrustUpdater.start();
1344                 database.start();
1345         }
1346
1347         /**
1348          * {@inheritDoc}
1349          */
1350         @Override
1351         public void serviceRun() {
1352                 long lastSaved = System.currentTimeMillis();
1353                 while (!shouldStop()) {
1354                         sleep(1000);
1355                         long now = System.currentTimeMillis();
1356                         if (shouldStop() || ((lastConfigurationUpdate > lastSaved) && ((now - lastConfigurationUpdate) > 5000))) {
1357                                 for (Sone localSone : getLocalSones()) {
1358                                         saveSone(localSone);
1359                                 }
1360                                 saveConfiguration();
1361                                 lastSaved = now;
1362                         }
1363                 }
1364         }
1365
1366         /**
1367          * Stops the core.
1368          */
1369         @Override
1370         public void serviceStop() {
1371                 localElementTicker.shutdownNow();
1372                 synchronized (soneInserters) {
1373                         for (Entry<Sone, SoneInserter> soneInserter : soneInserters.entrySet()) {
1374                                 soneInserter.getValue().stop();
1375                                 saveSone(soneInserter.getKey());
1376                         }
1377                 }
1378                 synchronized (soneRescuers) {
1379                         for (SoneRescuer soneRescuer : soneRescuers.values()) {
1380                                 soneRescuer.stop();
1381                         }
1382                 }
1383                 saveConfiguration();
1384                 database.stop();
1385                 webOfTrustUpdater.stop();
1386                 updateChecker.stop();
1387                 soneDownloader.stop();
1388                 soneDownloaders.shutdown();
1389                 identityManager.stop();
1390         }
1391
1392         //
1393         // PRIVATE METHODS
1394         //
1395
1396         /**
1397          * Saves the given Sone. This will persist all local settings for the given
1398          * Sone, such as the friends list and similar, private options.
1399          *
1400          * @param sone
1401          *            The Sone to save
1402          */
1403         private synchronized void saveSone(Sone sone) {
1404                 if (!sone.isLocal()) {
1405                         logger.log(Level.FINE, String.format("Tried to save non-local Sone: %s", sone));
1406                         return;
1407                 }
1408                 if (!(sone.getIdentity() instanceof OwnIdentity)) {
1409                         logger.log(Level.WARNING, String.format("Local Sone without OwnIdentity found, refusing to save: %s", sone));
1410                         return;
1411                 }
1412
1413                 logger.log(Level.INFO, String.format("Saving Sone: %s", sone));
1414                 try {
1415                         /* save Sone into configuration. */
1416                         String sonePrefix = "Sone/" + sone.getId();
1417                         configuration.getLongValue(sonePrefix + "/Time").setValue(sone.getTime());
1418                         configuration.getStringValue(sonePrefix + "/LastInsertFingerprint").setValue(soneInserters.get(sone).getLastInsertFingerprint());
1419
1420                         /* save profile. */
1421                         Profile profile = sone.getProfile();
1422                         configuration.getStringValue(sonePrefix + "/Profile/FirstName").setValue(profile.getFirstName());
1423                         configuration.getStringValue(sonePrefix + "/Profile/MiddleName").setValue(profile.getMiddleName());
1424                         configuration.getStringValue(sonePrefix + "/Profile/LastName").setValue(profile.getLastName());
1425                         configuration.getIntValue(sonePrefix + "/Profile/BirthDay").setValue(profile.getBirthDay());
1426                         configuration.getIntValue(sonePrefix + "/Profile/BirthMonth").setValue(profile.getBirthMonth());
1427                         configuration.getIntValue(sonePrefix + "/Profile/BirthYear").setValue(profile.getBirthYear());
1428                         configuration.getStringValue(sonePrefix + "/Profile/Avatar").setValue(profile.getAvatar());
1429
1430                         /* save profile fields. */
1431                         int fieldCounter = 0;
1432                         for (Field profileField : profile.getFields()) {
1433                                 String fieldPrefix = sonePrefix + "/Profile/Fields/" + fieldCounter++;
1434                                 configuration.getStringValue(fieldPrefix + "/Name").setValue(profileField.getName());
1435                                 configuration.getStringValue(fieldPrefix + "/Value").setValue(profileField.getValue());
1436                         }
1437                         configuration.getStringValue(sonePrefix + "/Profile/Fields/" + fieldCounter + "/Name").setValue(null);
1438
1439                         /* save posts. */
1440                         int postCounter = 0;
1441                         for (Post post : sone.getPosts()) {
1442                                 String postPrefix = sonePrefix + "/Posts/" + postCounter++;
1443                                 configuration.getStringValue(postPrefix + "/ID").setValue(post.getId());
1444                                 configuration.getStringValue(postPrefix + "/Recipient").setValue(post.getRecipientId().orNull());
1445                                 configuration.getLongValue(postPrefix + "/Time").setValue(post.getTime());
1446                                 configuration.getStringValue(postPrefix + "/Text").setValue(post.getText());
1447                         }
1448                         configuration.getStringValue(sonePrefix + "/Posts/" + postCounter + "/ID").setValue(null);
1449
1450                         /* save replies. */
1451                         int replyCounter = 0;
1452                         for (PostReply reply : sone.getReplies()) {
1453                                 String replyPrefix = sonePrefix + "/Replies/" + replyCounter++;
1454                                 configuration.getStringValue(replyPrefix + "/ID").setValue(reply.getId());
1455                                 configuration.getStringValue(replyPrefix + "/Post/ID").setValue(reply.getPostId());
1456                                 configuration.getLongValue(replyPrefix + "/Time").setValue(reply.getTime());
1457                                 configuration.getStringValue(replyPrefix + "/Text").setValue(reply.getText());
1458                         }
1459                         configuration.getStringValue(sonePrefix + "/Replies/" + replyCounter + "/ID").setValue(null);
1460
1461                         /* save post likes. */
1462                         int postLikeCounter = 0;
1463                         for (String postId : sone.getLikedPostIds()) {
1464                                 configuration.getStringValue(sonePrefix + "/Likes/Post/" + postLikeCounter++ + "/ID").setValue(postId);
1465                         }
1466                         configuration.getStringValue(sonePrefix + "/Likes/Post/" + postLikeCounter + "/ID").setValue(null);
1467
1468                         /* save reply likes. */
1469                         int replyLikeCounter = 0;
1470                         for (String replyId : sone.getLikedReplyIds()) {
1471                                 configuration.getStringValue(sonePrefix + "/Likes/Reply/" + replyLikeCounter++ + "/ID").setValue(replyId);
1472                         }
1473                         configuration.getStringValue(sonePrefix + "/Likes/Reply/" + replyLikeCounter + "/ID").setValue(null);
1474
1475                         /* save albums. first, collect in a flat structure, top-level first. */
1476                         List<Album> albums = FluentIterable.from(sone.getRootAlbum().getAlbums()).transformAndConcat(Album.FLATTENER).toList();
1477
1478                         int albumCounter = 0;
1479                         for (Album album : albums) {
1480                                 String albumPrefix = sonePrefix + "/Albums/" + albumCounter++;
1481                                 configuration.getStringValue(albumPrefix + "/ID").setValue(album.getId());
1482                                 configuration.getStringValue(albumPrefix + "/Title").setValue(album.getTitle());
1483                                 configuration.getStringValue(albumPrefix + "/Description").setValue(album.getDescription());
1484                                 configuration.getStringValue(albumPrefix + "/Parent").setValue(album.getParent().equals(sone.getRootAlbum()) ? null : album.getParent().getId());
1485                         }
1486                         configuration.getStringValue(sonePrefix + "/Albums/" + albumCounter + "/ID").setValue(null);
1487
1488                         /* save images. */
1489                         int imageCounter = 0;
1490                         for (Album album : albums) {
1491                                 for (Image image : album.getImages()) {
1492                                         if (!image.isInserted()) {
1493                                                 continue;
1494                                         }
1495                                         String imagePrefix = sonePrefix + "/Images/" + imageCounter++;
1496                                         configuration.getStringValue(imagePrefix + "/ID").setValue(image.getId());
1497                                         configuration.getStringValue(imagePrefix + "/Album").setValue(album.getId());
1498                                         configuration.getStringValue(imagePrefix + "/Key").setValue(image.getKey());
1499                                         configuration.getStringValue(imagePrefix + "/Title").setValue(image.getTitle());
1500                                         configuration.getStringValue(imagePrefix + "/Description").setValue(image.getDescription());
1501                                         configuration.getLongValue(imagePrefix + "/CreationTime").setValue(image.getCreationTime());
1502                                         configuration.getIntValue(imagePrefix + "/Width").setValue(image.getWidth());
1503                                         configuration.getIntValue(imagePrefix + "/Height").setValue(image.getHeight());
1504                                 }
1505                         }
1506                         configuration.getStringValue(sonePrefix + "/Images/" + imageCounter + "/ID").setValue(null);
1507
1508                         /* save options. */
1509                         configuration.getBooleanValue(sonePrefix + "/Options/AutoFollow").setValue(sone.getOptions().isAutoFollow());
1510                         configuration.getBooleanValue(sonePrefix + "/Options/EnableSoneInsertNotifications").setValue(sone.getOptions().isSoneInsertNotificationEnabled());
1511                         configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewSones").setValue(sone.getOptions().isShowNewSoneNotifications());
1512                         configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewPosts").setValue(sone.getOptions().isShowNewPostNotifications());
1513                         configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewReplies").setValue(sone.getOptions().isShowNewReplyNotifications());
1514                         configuration.getStringValue(sonePrefix + "/Options/ShowCustomAvatars").setValue(sone.getOptions().getShowCustomAvatars().name());
1515                         configuration.getStringValue(sonePrefix + "/Options/LoadLinkedImages").setValue(sone.getOptions().getLoadLinkedImages().name());
1516
1517                         configuration.save();
1518
1519                         webOfTrustUpdater.setProperty((OwnIdentity) sone.getIdentity(), "Sone.LatestEdition", String.valueOf(sone.getLatestEdition()));
1520
1521                         logger.log(Level.INFO, String.format("Sone %s saved.", sone));
1522                 } catch (ConfigurationException ce1) {
1523                         logger.log(Level.WARNING, String.format("Could not save Sone: %s", sone), ce1);
1524                 }
1525         }
1526
1527         /**
1528          * Saves the current options.
1529          */
1530         private void saveConfiguration() {
1531                 synchronized (configuration) {
1532                         if (storingConfiguration) {
1533                                 logger.log(Level.FINE, "Already storing configuration…");
1534                                 return;
1535                         }
1536                         storingConfiguration = true;
1537                 }
1538
1539                 /* store the options first. */
1540                 try {
1541                         preferences.saveTo(configuration);
1542
1543                         /* save known Sones. */
1544                         int soneCounter = 0;
1545                         synchronized (knownSones) {
1546                                 for (String knownSoneId : knownSones) {
1547                                         configuration.getStringValue("KnownSone/" + soneCounter++ + "/ID").setValue(knownSoneId);
1548                                 }
1549                                 configuration.getStringValue("KnownSone/" + soneCounter + "/ID").setValue(null);
1550                         }
1551
1552                         /* save known posts. */
1553                         database.save();
1554
1555                         /* now save it. */
1556                         configuration.save();
1557
1558                 } catch (ConfigurationException ce1) {
1559                         logger.log(Level.SEVERE, "Could not store configuration!", ce1);
1560                 } catch (DatabaseException de1) {
1561                         logger.log(Level.SEVERE, "Could not save database!", de1);
1562                 } finally {
1563                         synchronized (configuration) {
1564                                 storingConfiguration = false;
1565                         }
1566                 }
1567         }
1568
1569         /**
1570          * Loads the configuration.
1571          */
1572         private void loadConfiguration() {
1573                 new PreferencesLoader(preferences).loadFrom(configuration);
1574
1575                 /* load known Sones. */
1576                 int soneCounter = 0;
1577                 while (true) {
1578                         String knownSoneId = configuration.getStringValue("KnownSone/" + soneCounter++ + "/ID").getValue(null);
1579                         if (knownSoneId == null) {
1580                                 break;
1581                         }
1582                         synchronized (knownSones) {
1583                                 knownSones.add(knownSoneId);
1584                         }
1585                 }
1586         }
1587
1588         /**
1589          * Notifies the core that a new {@link OwnIdentity} was added.
1590          *
1591          * @param ownIdentityAddedEvent
1592          *            The event
1593          */
1594         @Subscribe
1595         public void ownIdentityAdded(OwnIdentityAddedEvent ownIdentityAddedEvent) {
1596                 OwnIdentity ownIdentity = ownIdentityAddedEvent.ownIdentity();
1597                 logger.log(Level.FINEST, String.format("Adding OwnIdentity: %s", ownIdentity));
1598                 if (ownIdentity.hasContext("Sone")) {
1599                         addLocalSone(ownIdentity);
1600                 }
1601         }
1602
1603         /**
1604          * Notifies the core that an {@link OwnIdentity} was removed.
1605          *
1606          * @param ownIdentityRemovedEvent
1607          *            The event
1608          */
1609         @Subscribe
1610         public void ownIdentityRemoved(OwnIdentityRemovedEvent ownIdentityRemovedEvent) {
1611                 OwnIdentity ownIdentity = ownIdentityRemovedEvent.ownIdentity();
1612                 logger.log(Level.FINEST, String.format("Removing OwnIdentity: %s", ownIdentity));
1613                 trustedIdentities.removeAll(ownIdentity);
1614         }
1615
1616         /**
1617          * Notifies the core that a new {@link Identity} was added.
1618          *
1619          * @param identityAddedEvent
1620          *            The event
1621          */
1622         @Subscribe
1623         public void identityAdded(IdentityAddedEvent identityAddedEvent) {
1624                 Identity identity = identityAddedEvent.identity();
1625                 logger.log(Level.FINEST, String.format("Adding Identity: %s", identity));
1626                 trustedIdentities.put(identityAddedEvent.ownIdentity(), identity);
1627                 addRemoteSone(identity);
1628         }
1629
1630         /**
1631          * Notifies the core that an {@link Identity} was updated.
1632          *
1633          * @param identityUpdatedEvent
1634          *            The event
1635          */
1636         @Subscribe
1637         public void identityUpdated(IdentityUpdatedEvent identityUpdatedEvent) {
1638                 Identity identity = identityUpdatedEvent.identity();
1639                 final Sone sone = getRemoteSone(identity.getId());
1640                 if (sone.isLocal()) {
1641                         return;
1642                 }
1643                 String newLatestEdition = identity.getProperty("Sone.LatestEdition");
1644                 if (newLatestEdition != null) {
1645                         Long parsedNewLatestEdition = tryParse(newLatestEdition);
1646                         if (parsedNewLatestEdition != null) {
1647                                 sone.setLatestEdition(parsedNewLatestEdition);
1648                         }
1649                 }
1650                 soneDownloader.addSone(sone);
1651                 soneDownloaders.execute(soneDownloader.fetchSoneAsSskAction(sone));
1652         }
1653
1654         /**
1655          * Notifies the core that an {@link Identity} was removed.
1656          *
1657          * @param identityRemovedEvent
1658          *            The event
1659          */
1660         @Subscribe
1661         public void identityRemoved(IdentityRemovedEvent identityRemovedEvent) {
1662                 OwnIdentity ownIdentity = identityRemovedEvent.ownIdentity();
1663                 Identity identity = identityRemovedEvent.identity();
1664                 trustedIdentities.remove(ownIdentity, identity);
1665                 for (Entry<OwnIdentity, Collection<Identity>> trustedIdentity : trustedIdentities.asMap().entrySet()) {
1666                         if (trustedIdentity.getKey().equals(ownIdentity)) {
1667                                 continue;
1668                         }
1669                         if (trustedIdentity.getValue().contains(identity)) {
1670                                 return;
1671                         }
1672                 }
1673                 Sone sone = getSone(identity.getId());
1674                 if (sone == null) {
1675                         /* TODO - we don’t have the Sone anymore. should this happen? */
1676                         return;
1677                 }
1678                 for (PostReply postReply : sone.getReplies()) {
1679                         eventBus.post(new PostReplyRemovedEvent(postReply));
1680                 }
1681                 for (Post post : sone.getPosts()) {
1682                         eventBus.post(new PostRemovedEvent(post));
1683                 }
1684                 eventBus.post(new SoneRemovedEvent(sone));
1685                 database.removeSone(sone);
1686         }
1687
1688         /**
1689          * Deletes the temporary image.
1690          *
1691          * @param imageInsertFinishedEvent
1692          *            The event
1693          */
1694         @Subscribe
1695         public void imageInsertFinished(ImageInsertFinishedEvent imageInsertFinishedEvent) {
1696                 logger.log(Level.WARNING, String.format("Image insert finished for %s: %s", imageInsertFinishedEvent.image(), imageInsertFinishedEvent.resultingUri()));
1697                 imageInsertFinishedEvent.image().modify().setKey(imageInsertFinishedEvent.resultingUri().toString()).update();
1698                 deleteTemporaryImage(imageInsertFinishedEvent.image().getId());
1699                 touchConfiguration();
1700         }
1701
1702         @VisibleForTesting
1703         class MarkPostKnown implements Runnable {
1704
1705                 private final Post post;
1706
1707                 public MarkPostKnown(Post post) {
1708                         this.post = post;
1709                 }
1710
1711                 @Override
1712                 public void run() {
1713                         markPostKnown(post);
1714                 }
1715
1716         }
1717
1718         @VisibleForTesting
1719         class MarkReplyKnown implements Runnable {
1720
1721                 private final PostReply postReply;
1722
1723                 public MarkReplyKnown(PostReply postReply) {
1724                         this.postReply = postReply;
1725                 }
1726
1727                 @Override
1728                 public void run() {
1729                         markReplyKnown(postReply);
1730                 }
1731
1732         }
1733
1734 }