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

   1 /*
   2  * FreenetSone - Core.java - Copyright © 2010 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 java.net.MalformedURLException;
  21 import java.util.ArrayList;
  22 import java.util.Collection;
  23 import java.util.Collections;
  24 import java.util.Comparator;
  25 import java.util.HashMap;
  26 import java.util.HashSet;
  27 import java.util.List;
  28 import java.util.Map;
  29 import java.util.Set;
  30 import java.util.UUID;
  31 import java.util.logging.Level;
  32 import java.util.logging.Logger;
  33
  34 import net.pterodactylus.sone.core.SoneException.Type;
  35 import net.pterodactylus.sone.data.Post;
  36 import net.pterodactylus.sone.data.Profile;
  37 import net.pterodactylus.sone.data.Reply;
  38 import net.pterodactylus.sone.data.Sone;
  39 import net.pterodactylus.util.config.Configuration;
  40 import net.pterodactylus.util.config.ConfigurationException;
  41 import net.pterodactylus.util.filter.Filter;
  42 import net.pterodactylus.util.filter.Filters;
  43 import net.pterodactylus.util.logging.Logging;
  44 import net.pterodactylus.util.service.AbstractService;
  45 import freenet.client.FetchResult;
  46 import freenet.keys.FreenetURI;
  47
  48 /**
  49  * The Sone core.
  50  *
  51  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  52  */
  53 public class Core extends AbstractService {
  54
  55         /** The logger. */
  56         private static final Logger logger = Logging.getLogger(Core.class);
  57
  58         /** The configuration. */
  59         private Configuration configuration;
  60
  61         /** Interface to freenet. */
  62         private FreenetInterface freenetInterface;
  63
  64         /** The Sone downloader. */
  65         private SoneDownloader soneDownloader;
  66
  67         /** The local Sones. */
  68         private final Set<Sone> localSones = new HashSet<Sone>();
  69
  70         /** Sone inserters. */
  71         private final Map<Sone, SoneInserter> soneInserters = new HashMap<Sone, SoneInserter>();
  72
  73         /* various caches follow here. */
  74
  75         /** Cache for all known Sones. */
  76         private final Map<String, Sone> soneCache = new HashMap<String, Sone>();
  77
  78         /** Cache for all known posts. */
  79         private final Map<String, Post> postCache = new HashMap<String, Post>();
  80
  81         /** Cache for all known replies. */
  82         private final Map<String, Reply> replyCache = new HashMap<String, Reply>();
  83
  84         /**
  85          * Creates a new core.
  86          */
  87         public Core() {
  88                 super("Sone Core");
  89         }
  90
  91         //
  92         // ACCESSORS
  93         //
  94
  95         /**
  96          * Sets the configuration of the core.
  97          *
  98          * @param configuration
  99          *            The configuration of the core
 100          * @return This core (for method chaining)
 101          */
 102         public Core configuration(Configuration configuration) {
 103                 this.configuration = configuration;
 104                 return this;
 105         }
 106
 107         /**
 108          * Sets the Freenet interface to use.
 109          *
 110          * @param freenetInterface
 111          *            The Freenet interface to use
 112          * @return This core (for method chaining)
 113          */
 114         public Core freenetInterface(FreenetInterface freenetInterface) {
 115                 this.freenetInterface = freenetInterface;
 116                 soneDownloader = new SoneDownloader(this, freenetInterface);
 117                 soneDownloader.start();
 118                 return this;
 119         }
 120
 121         /**
 122          * Returns the local Sones.
 123          *
 124          * @return The local Sones
 125          */
 126         public Set<Sone> getSones() {
 127                 return Collections.unmodifiableSet(localSones);
 128         }
 129
 130         /**
 131          * Returns the Sone with the given ID, or an empty Sone that has been
 132          * initialized with the given ID.
 133          *
 134          * @param soneId
 135          *            The ID of the Sone
 136          * @return The Sone
 137          */
 138         public Sone getSone(String soneId) {
 139                 if (!soneCache.containsKey(soneId)) {
 140                         Sone sone = new Sone(soneId);
 141                         soneCache.put(soneId, sone);
 142                 }
 143                 return soneCache.get(soneId);
 144         }
 145
 146         /**
 147          * Returns all known sones.
 148          *
 149          * @return All known sones
 150          */
 151         public Collection<Sone> getKnownSones() {
 152                 return soneCache.values();
 153         }
 154
 155         /**
 156          * Gets all known Sones that are not local Sones.
 157          *
 158          * @return All remote Sones
 159          */
 160         public Collection<Sone> getRemoteSones() {
 161                 return Filters.filteredCollection(getKnownSones(), new Filter<Sone>() {
 162
 163                         @Override
 164                         @SuppressWarnings("synthetic-access")
 165                         public boolean filterObject(Sone object) {
 166                                 return !localSones.contains(object);
 167                         }
 168                 });
 169         }
 170
 171         /**
 172          * Creates a new post and adds it to the given Sone.
 173          *
 174          * @param sone
 175          *            The sone that creates the post
 176          * @param text
 177          *            The text of the post
 178          * @return The created post
 179          */
 180         public Post createPost(Sone sone, String text) {
 181                 return createPost(sone, System.currentTimeMillis(), text);
 182         }
 183
 184         /**
 185          * Creates a new post and adds it to the given Sone.
 186          *
 187          * @param sone
 188          *            The Sone that creates the post
 189          * @param time
 190          *            The time of the post
 191          * @param text
 192          *            The text of the post
 193          * @return The created post
 194          */
 195         public Post createPost(Sone sone, long time, String text) {
 196                 Post post = getPost(UUID.randomUUID().toString()).setSone(sone).setTime(time).setText(text);
 197                 sone.addPost(post);
 198                 return post;
 199         }
 200
 201         /**
 202          * Creates a reply.
 203          *
 204          * @param sone
 205          *            The Sone that posts the reply
 206          * @param post
 207          *            The post the reply refers to
 208          * @param text
 209          *            The text of the reply
 210          * @return The created reply
 211          */
 212         public Reply createReply(Sone sone, Post post, String text) {
 213                 return createReply(sone, post, System.currentTimeMillis(), text);
 214         }
 215
 216         /**
 217          * Creates a reply.
 218          *
 219          * @param sone
 220          *            The Sone that posts the reply
 221          * @param post
 222          *            The post the reply refers to
 223          * @param time
 224          *            The time of the post
 225          * @param text
 226          *            The text of the reply
 227          * @return The created reply
 228          */
 229         public Reply createReply(Sone sone, Post post, long time, String text) {
 230                 Reply reply = getReply(UUID.randomUUID().toString()).setSone(sone).setPost(post).setTime(time).setText(text);
 231                 sone.addReply(reply);
 232                 return reply;
 233         }
 234
 235         //
 236         // ACTIONS
 237         //
 238
 239         /**
 240          * Adds a Sone to watch for updates. The Sone needs to be completely
 241          * initialized.
 242          *
 243          * @param sone
 244          *            The Sone to watch for updates
 245          */
 246         public void addSone(Sone sone) {
 247                 soneCache.put(sone.getId(), sone);
 248                 soneDownloader.addSone(sone);
 249         }
 250
 251         /**
 252          * Adds the given Sone.
 253          *
 254          * @param sone
 255          *            The Sone to add
 256          */
 257         public void addLocalSone(Sone sone) {
 258                 if (localSones.add(sone)) {
 259                         SoneInserter soneInserter = new SoneInserter(freenetInterface, sone);
 260                         soneInserter.start();
 261                         soneInserters.put(sone, soneInserter);
 262                 }
 263         }
 264
 265         /**
 266          * Creates a new Sone at a random location.
 267          *
 268          * @param name
 269          *            The name of the Sone
 270          * @return The created Sone
 271          * @throws SoneException
 272          *             if a Sone error occurs
 273          */
 274         public Sone createSone(String name) throws SoneException {
 275                 return createSone(name, null, null);
 276         }
 277
 278         /**
 279          * Creates a new Sone at the given location. If one of {@code requestUri} or
 280          * {@code insertUrI} is {@code null}, the Sone is created at a random
 281          * location.
 282          *
 283          * @param name
 284          *            The name of the Sone
 285          * @param requestUri
 286          *            The request URI of the Sone, or {@link NullPointerException}
 287          *            to create a Sone at a random location
 288          * @param insertUri
 289          *            The insert URI of the Sone, or {@code null} to create a Sone
 290          *            at a random location
 291          * @return The created Sone
 292          * @throws SoneException
 293          *             if a Sone error occurs
 294          */
 295         public Sone createSone(String name, String requestUri, String insertUri) throws SoneException {
 296                 if ((name == null) || (name.trim().length() == 0)) {
 297                         throw new SoneException(Type.INVALID_SONE_NAME);
 298                 }
 299                 String finalRequestUri;
 300                 String finalInsertUri;
 301                 if ((requestUri == null) || (insertUri == null)) {
 302                         String[] keyPair = freenetInterface.generateKeyPair();
 303                         finalRequestUri = keyPair[0];
 304                         finalInsertUri = keyPair[1];
 305                 } else {
 306                         finalRequestUri = requestUri;
 307                         finalInsertUri = insertUri;
 308                 }
 309                 Sone sone;
 310                 try {
 311                         logger.log(Level.FINEST, "Creating new Sone “%s” at %s (%s)…", new Object[] { name, finalRequestUri, finalInsertUri });
 312                         sone = getSone(UUID.randomUUID().toString()).setName(name).setRequestUri(new FreenetURI(finalRequestUri).setKeyType("USK").setDocName("Sone-" + name)).setInsertUri(new FreenetURI(finalInsertUri).setKeyType("USK").setDocName("Sone-" + name));
 313                         sone.setProfile(new Profile());
 314                         /* set modification counter to 1 so it is inserted immediately. */
 315                         sone.setModificationCounter(1);
 316                         addLocalSone(sone);
 317                 } catch (MalformedURLException mue1) {
 318                         throw new SoneException(Type.INVALID_URI);
 319                 }
 320                 return sone;
 321         }
 322
 323         /**
 324          * Loads the Sone from the given request URI. The fetching of the data is
 325          * performed in a new thread so this method returns immediately.
 326          *
 327          * @param requestUri
 328          *            The request URI to load the Sone from
 329          */
 330         public void loadSone(final String requestUri) {
 331                 new Thread(new Runnable() {
 332
 333                         @Override
 334                         @SuppressWarnings("synthetic-access")
 335                         public void run() {
 336                                 try {
 337                                         FreenetURI realRequestUri = new FreenetURI(requestUri).setMetaString(new String[] { "sone.xml" });
 338                                         FetchResult fetchResult = freenetInterface.fetchUri(realRequestUri);
 339                                         Sone parsedSone = soneDownloader.parseSone(null, fetchResult, realRequestUri);
 340                                         if (parsedSone != null) {
 341                                                 addSone(parsedSone);
 342                                         }
 343                                 } catch (MalformedURLException mue1) {
 344                                         logger.log(Level.INFO, "Could not create URI from “" + requestUri + "”.", mue1);
 345                                 }
 346                         }
 347                 }, "Sone Downloader").start();
 348         }
 349
 350         /**
 351          * Deletes the given Sone from this plugin instance.
 352          *
 353          * @param sone
 354          *            The sone to delete
 355          */
 356         public void deleteSone(Sone sone) {
 357                 SoneInserter soneInserter = soneInserters.remove(sone);
 358                 soneInserter.stop();
 359                 localSones.remove(sone);
 360         }
 361
 362         /**
 363          * Returns the post with the given ID. If no post exists yet with the given
 364          * ID, a new post is returned.
 365          *
 366          * @param postId
 367          *            The ID of the post
 368          * @return The post
 369          */
 370         public Post getPost(String postId) {
 371                 if (!postCache.containsKey(postId)) {
 372                         postCache.put(postId, new Post(postId));
 373                 }
 374                 return postCache.get(postId);
 375         }
 376
 377         /**
 378          * Returns the reply with the given ID. If no reply exists yet with the
 379          * given ID, a new reply is returned.
 380          *
 381          * @param replyId
 382          *            The ID of the reply
 383          * @return The reply
 384          */
 385         public Reply getReply(String replyId) {
 386                 if (!replyCache.containsKey(replyId)) {
 387                         replyCache.put(replyId, new Reply(replyId));
 388                 }
 389                 return replyCache.get(replyId);
 390         }
 391
 392         /**
 393          * Gets all replies to the given post, sorted by date, oldest first.
 394          *
 395          * @param post
 396          *            The post the replies refer to
 397          * @return The sorted list of replies for the post
 398          */
 399         public List<Reply> getReplies(Post post) {
 400                 List<Reply> replies = new ArrayList<Reply>();
 401                 for (Reply reply : replyCache.values()) {
 402                         if (reply.getPost().equals(post)) {
 403                                 replies.add(reply);
 404                         }
 405                 }
 406                 Collections.sort(replies, new Comparator<Reply>() {
 407
 408                         /**
 409                          * {@inheritDoc}
 410                          */
 411                         @Override
 412                         public int compare(Reply leftReply, Reply rightReply) {
 413                                 return (int) Math.max(Integer.MIN_VALUE, Math.min(Integer.MAX_VALUE, leftReply.getTime() - rightReply.getTime()));
 414                         }
 415                 });
 416                 return replies;
 417         }
 418
 419         //
 420         // SERVICE METHODS
 421         //
 422
 423         /**
 424          * {@inheritDoc}
 425          */
 426         @Override
 427         protected void serviceStart() {
 428                 loadConfiguration();
 429         }
 430
 431         /**
 432          * {@inheritDoc}
 433          */
 434         @Override
 435         protected void serviceStop() {
 436                 soneDownloader.stop();
 437                 /* stop all Sone inserters. */
 438                 for (SoneInserter soneInserter : soneInserters.values()) {
 439                         soneInserter.stop();
 440                 }
 441                 saveConfiguration();
 442         }
 443
 444         //
 445         // PRIVATE METHODS
 446         //
 447
 448         /**
 449          * Loads the configuration.
 450          */
 451         private void loadConfiguration() {
 452                 logger.entering(Core.class.getName(), "loadConfiguration()");
 453
 454                 /* parse local Sones. */
 455                 logger.log(Level.INFO, "Loading Sones…");
 456                 int soneId = 0;
 457                 do {
 458                         String sonePrefix = "Sone/Sone." + soneId++;
 459                         String id = configuration.getStringValue(sonePrefix + "/ID").getValue(null);
 460                         if (id == null) {
 461                                 break;
 462                         }
 463                         String name = configuration.getStringValue(sonePrefix + "/Name").getValue(null);
 464                         String insertUri = configuration.getStringValue(sonePrefix + "/InsertURI").getValue(null);
 465                         String requestUri = configuration.getStringValue(sonePrefix + "/RequestURI").getValue(null);
 466                         long modificationCounter = configuration.getLongValue(sonePrefix + "/ModificationCounter").getValue((long) 0);
 467                         String firstName = configuration.getStringValue(sonePrefix + "/Profile/FirstName").getValue(null);
 468                         String middleName = configuration.getStringValue(sonePrefix + "/Profile/MiddleName").getValue(null);
 469                         String lastName = configuration.getStringValue(sonePrefix + "/Profile/LastName").getValue(null);
 470                         try {
 471                                 Profile profile = new Profile();
 472                                 profile.setFirstName(firstName);
 473                                 profile.setMiddleName(middleName);
 474                                 profile.setLastName(lastName);
 475                                 Sone sone = getSone(id).setName(name).setRequestUri(new FreenetURI(requestUri)).setInsertUri(new FreenetURI(insertUri));
 476                                 sone.setProfile(profile);
 477                                 int postId = 0;
 478                                 do {
 479                                         String postPrefix = sonePrefix + "/Post." + postId++;
 480                                         id = configuration.getStringValue(postPrefix + "/ID").getValue(null);
 481                                         if (id == null) {
 482                                                 break;
 483                                         }
 484                                         long time = configuration.getLongValue(postPrefix + "/Time").getValue(null);
 485                                         String text = configuration.getStringValue(postPrefix + "/Text").getValue(null);
 486                                         Post post = getPost(id).setSone(sone).setTime(time).setText(text);
 487                                         sone.addPost(post);
 488                                 } while (true);
 489                                 int replyCounter = 0;
 490                                 do {
 491                                         String replyPrefix = sonePrefix + "/Reply." + replyCounter++;
 492                                         String replyId = configuration.getStringValue(replyPrefix + "/ID").getValue(null);
 493                                         if (replyId == null) {
 494                                                 break;
 495                                         }
 496                                         Post replyPost = getPost(configuration.getStringValue(replyPrefix + "/Post").getValue(null));
 497                                         long replyTime = configuration.getLongValue(replyPrefix + "/Time").getValue(null);
 498                                         String replyText = configuration.getStringValue(replyPrefix + "/Text").getValue(null);
 499                                         Reply reply = getReply(replyId).setSone(sone).setPost(replyPost).setTime(replyTime).setText(replyText);
 500                                         sone.addReply(reply);
 501                                 } while (true);
 502
 503                                 /* load friends. */
 504                                 int friendCounter = 0;
 505                                 while (true) {
 506                                         String friendPrefix = sonePrefix + "/Friend." + friendCounter++;
 507                                         String friendId = configuration.getStringValue(friendPrefix + "/ID").getValue(null);
 508                                         if (friendId == null) {
 509                                                 break;
 510                                         }
 511                                         Sone friendSone = getSone(friendId);
 512                                         String friendKey = configuration.getStringValue(friendPrefix + "/Key").getValue(null);
 513                                         String friendName = configuration.getStringValue(friendPrefix + "/Name").getValue(null);
 514                                         friendSone.setRequestUri(new FreenetURI(friendKey)).setName(friendName);
 515                                         loadSone(friendKey);
 516                                         sone.addFriend(friendSone);
 517                                 }
 518
 519                                 sone.setModificationCounter(modificationCounter);
 520                                 addLocalSone(sone);
 521                         } catch (MalformedURLException mue1) {
 522                                 logger.log(Level.WARNING, "Could not create Sone from requestUri (“" + requestUri + "”) and insertUri (“" + insertUri + "”)!", mue1);
 523                         }
 524                 } while (true);
 525                 logger.log(Level.INFO, "Loaded %d Sones.", getSones().size());
 526
 527                 logger.exiting(Core.class.getName(), "loadConfiguration()");
 528         }
 529
 530         /**
 531          * Saves the configuraiton.
 532          */
 533         private void saveConfiguration() {
 534                 Set<Sone> sones = getSones();
 535                 logger.log(Level.INFO, "Storing %d Sones…", sones.size());
 536                 try {
 537                         /* store all Sones. */
 538                         int soneId = 0;
 539                         for (Sone sone : localSones) {
 540                                 String sonePrefix = "Sone/Sone." + soneId++;
 541                                 configuration.getStringValue(sonePrefix + "/ID").setValue(sone.getId());
 542                                 configuration.getStringValue(sonePrefix + "/Name").setValue(sone.getName());
 543                                 configuration.getStringValue(sonePrefix + "/RequestURI").setValue(sone.getRequestUri().toString());
 544                                 configuration.getStringValue(sonePrefix + "/InsertURI").setValue(sone.getInsertUri().toString());
 545                                 configuration.getLongValue(sonePrefix + "/ModificationCounter").setValue(sone.getModificationCounter());
 546                                 Profile profile = sone.getProfile();
 547                                 configuration.getStringValue(sonePrefix + "/Profile/FirstName").setValue(profile.getFirstName());
 548                                 configuration.getStringValue(sonePrefix + "/Profile/MiddleName").setValue(profile.getMiddleName());
 549                                 configuration.getStringValue(sonePrefix + "/Profile/LastName").setValue(profile.getLastName());
 550                                 int postId = 0;
 551                                 for (Post post : sone.getPosts()) {
 552                                         String postPrefix = sonePrefix + "/Post." + postId++;
 553                                         configuration.getStringValue(postPrefix + "/ID").setValue(post.getId());
 554                                         configuration.getLongValue(postPrefix + "/Time").setValue(post.getTime());
 555                                         configuration.getStringValue(postPrefix + "/Text").setValue(post.getText());
 556                                 }
 557                                 /* write null ID as terminator. */
 558                                 configuration.getStringValue(sonePrefix + "/Post." + postId + "/ID").setValue(null);
 559
 560                                 int replyId = 0;
 561                                 for (Reply reply : sone.getReplies()) {
 562                                         String replyPrefix = sonePrefix + "/Reply." + replyId++;
 563                                         configuration.getStringValue(replyPrefix + "/ID").setValue(reply.getId());
 564                                         configuration.getStringValue(replyPrefix + "/Post").setValue(reply.getPost().getId());
 565                                         configuration.getLongValue(replyPrefix + "/Time").setValue(reply.getTime());
 566                                         configuration.getStringValue(replyPrefix + "/Text").setValue(reply.getText());
 567                                 }
 568                                 /* write null ID as terminator. */
 569                                 configuration.getStringValue(sonePrefix + "/Reply." + replyId + "/ID").setValue(null);
 570
 571                                 int friendId = 0;
 572                                 for (Sone friend : sone.getFriends()) {
 573                                         String friendPrefix = sonePrefix + "/Friend." + friendId++;
 574                                         configuration.getStringValue(friendPrefix + "/ID").setValue(friend.getId());
 575                                         configuration.getStringValue(friendPrefix + "/Key").setValue(friend.getRequestUri().toString());
 576                                         configuration.getStringValue(friendPrefix + "/Name").setValue(friend.getName());
 577                                 }
 578                                 /* write null ID as terminator. */
 579                                 configuration.getStringValue(sonePrefix + "/Friend." + friendId + "/ID").setValue(null);
 580
 581                         }
 582                         /* write null ID as terminator. */
 583                         configuration.getStringValue("Sone/Sone." + soneId + "/ID").setValue(null);
 584
 585                 } catch (ConfigurationException ce1) {
 586                         logger.log(Level.WARNING, "Could not store configuration!", ce1);
 587                 }
 588         }
 589
 590 }