Remove updated time setter from Sone, store update time in database.
[Sone.git] / src / main / java / net / pterodactylus / sone / database / memory / MemoryDatabase.java
index 18a5718..d5d5396 100644 (file)
@@ -21,13 +21,15 @@ import static com.google.common.base.Optional.fromNullable;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.base.Predicates.not;
 import static com.google.common.collect.FluentIterable.from;
-import static java.util.Collections.unmodifiableCollection;
+import static java.lang.String.format;
+import static java.util.logging.Level.WARNING;
 import static net.pterodactylus.sone.data.Reply.TIME_COMPARATOR;
 import static net.pterodactylus.sone.data.Sone.LOCAL_SONE_FILTER;
 import static net.pterodactylus.sone.data.Sone.toAllAlbums;
 import static net.pterodactylus.sone.data.Sone.toAllImages;
 
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -36,12 +38,25 @@ import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
-
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import net.pterodactylus.sone.core.ConfigurationSoneParser;
+import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidAlbumFound;
+import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidImageFound;
+import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidParentAlbumFound;
+import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidPostFound;
+import net.pterodactylus.sone.core.ConfigurationSoneParser.InvalidPostReplyFound;
 import net.pterodactylus.sone.data.Album;
+import net.pterodactylus.sone.data.Client;
 import net.pterodactylus.sone.data.Image;
+import net.pterodactylus.sone.data.LocalSone;
 import net.pterodactylus.sone.data.Post;
 import net.pterodactylus.sone.data.PostReply;
+import net.pterodactylus.sone.data.Profile;
+import net.pterodactylus.sone.data.Profile.Field;
 import net.pterodactylus.sone.data.Sone;
+import net.pterodactylus.sone.data.Sone.ShowCustomAvatars;
 import net.pterodactylus.sone.data.impl.AlbumBuilderImpl;
 import net.pterodactylus.sone.data.impl.ImageBuilderImpl;
 import net.pterodactylus.sone.database.AlbumBuilder;
@@ -53,15 +68,21 @@ import net.pterodactylus.sone.database.PostDatabase;
 import net.pterodactylus.sone.database.PostReplyBuilder;
 import net.pterodactylus.sone.database.SoneBuilder;
 import net.pterodactylus.sone.database.SoneProvider;
+import net.pterodactylus.sone.freenet.wot.OwnIdentity;
+import net.pterodactylus.sone.main.SonePlugin;
+import net.pterodactylus.sone.utils.Optionals;
 import net.pterodactylus.util.config.Configuration;
 import net.pterodactylus.util.config.ConfigurationException;
 
+import com.google.common.base.Function;
 import com.google.common.base.Optional;
 import com.google.common.base.Predicate;
+import com.google.common.collect.FluentIterable;
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Multimap;
 import com.google.common.collect.SortedSetMultimap;
 import com.google.common.collect.TreeMultimap;
+import com.google.common.primitives.Longs;
 import com.google.common.util.concurrent.AbstractService;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
@@ -74,6 +95,8 @@ import com.google.inject.Singleton;
 @Singleton
 public class MemoryDatabase extends AbstractService implements Database {
 
+       private static final Logger logger = Logger.getLogger("Sone.Database.Memory");
+       private static final String LATEST_EDITION_PROPERTY = "Sone.LatestEdition";
        /** The lock. */
        private final ReadWriteLock lock = new ReentrantReadWriteLock();
 
@@ -84,16 +107,9 @@ public class MemoryDatabase extends AbstractService implements Database {
        private final Configuration configuration;
        private final ConfigurationLoader configurationLoader;
 
+       private final Set<String> localSones = new HashSet<String>();
        private final Map<String, Sone> allSones = new HashMap<String, Sone>();
-
-       /** All posts by their ID. */
-       private final Map<String, Post> allPosts = new HashMap<String, Post>();
-
-       /** All posts by their Sones. */
-       private final Multimap<String, Post> sonePosts = HashMultimap.create();
-
-       /** Whether posts are known. */
-       private final Set<String> knownPosts = new HashSet<String>();
+       private final Map<String, String> lastInsertFingerprints = new HashMap<String, String>();
 
        /** All post replies by their ID. */
        private final Map<String, PostReply> allPostReplies = new HashMap<String, PostReply>();
@@ -116,7 +132,10 @@ public class MemoryDatabase extends AbstractService implements Database {
        private final Map<String, Image> allImages = new HashMap<String, Image>();
        private final Multimap<String, Image> soneImages = HashMultimap.create();
 
+       private final MemorySoneDatabase soneDatabase;
+       private final MemoryPostDatabase postDatabase;
        private final MemoryBookmarkDatabase memoryBookmarkDatabase;
+       private final MemoryFriendDatabase memoryFriendDatabase;
 
        /**
         * Creates a new memory database.
@@ -131,14 +150,180 @@ public class MemoryDatabase extends AbstractService implements Database {
                this.soneProvider = soneProvider;
                this.configuration = configuration;
                this.configurationLoader = new ConfigurationLoader(configuration);
+               soneDatabase = new MemorySoneDatabase(configurationLoader);
+               postDatabase = new MemoryPostDatabase(this, configurationLoader);
                memoryBookmarkDatabase =
                                new MemoryBookmarkDatabase(this, configurationLoader);
+               memoryFriendDatabase = new MemoryFriendDatabase(configurationLoader);
        }
 
        //
        // DATABASE METHODS
        //
 
+       @Override
+       public Optional<LocalSone> getLocalSone(String localSoneId) {
+               lock.readLock().lock();
+               try {
+                       if (!localSones.contains(localSoneId)) {
+                               return Optional.absent();
+                       }
+                       return Optional.of((LocalSone) allSones.get(localSoneId));
+               } finally {
+                       lock.readLock().unlock();
+               }
+       }
+
+       @Override
+       public LocalSone registerLocalSone(OwnIdentity ownIdentity) {
+               final LocalSone localSone = loadLocalSone(ownIdentity);
+               localSones.add(ownIdentity.getId());
+               return localSone;
+       }
+
+       private LocalSone loadLocalSone(OwnIdentity ownIdentity) {
+               LocalSone localSone = (LocalSone) newSoneBuilder().local().from(ownIdentity).build();
+               localSone.setLatestEdition(
+                               Optional.fromNullable(
+                                               Longs.tryParse(ownIdentity.getProperty(LATEST_EDITION_PROPERTY)))
+                               .or(0L));
+               localSone.setClient(new Client("Sone", SonePlugin.VERSION.toString()));
+               localSone.setKnown(true);
+
+               loadSone(localSone);
+               return localSone;
+       }
+
+       public void loadSone(LocalSone sone) {
+               long soneTime = configurationLoader.getLocalSoneTime(sone.getId());
+               if (soneTime == -1) {
+                       return;
+               }
+
+               /* load profile. */
+               ConfigurationSoneParser configurationSoneParser = new ConfigurationSoneParser(configuration, sone);
+               Profile profile = configurationSoneParser.parseProfile();
+
+               /* load posts. */
+               Collection<Post> posts;
+               try {
+                       posts = configurationSoneParser.parsePosts(this);
+               } catch (InvalidPostFound ipf) {
+                       logger.log(Level.WARNING, "Invalid post found, aborting load!");
+                       return;
+               }
+
+               /* load replies. */
+               Collection<PostReply> postReplies;
+               try {
+                       postReplies = configurationSoneParser.parsePostReplies(this);
+               } catch (InvalidPostReplyFound iprf) {
+                       logger.log(Level.WARNING, "Invalid reply found, aborting load!");
+                       return;
+               }
+
+               /* load post likes. */
+               Set<String> likedPostIds = configurationSoneParser.parseLikedPostIds();
+
+               /* load reply likes. */
+               Set<String> likedReplyIds = configurationSoneParser.parseLikedPostReplyIds();
+
+               /* load albums. */
+               List<Album> topLevelAlbums;
+               try {
+                       topLevelAlbums = configurationSoneParser.parseTopLevelAlbums(this);
+               } catch (InvalidAlbumFound iaf) {
+                       logger.log(Level.WARNING, "Invalid album found, aborting load!");
+                       return;
+               } catch (InvalidParentAlbumFound ipaf) {
+                       logger.log(Level.WARNING,
+                                       format("Invalid parent album ID: %s", ipaf.getAlbumParentId()));
+                       return;
+               }
+
+               /* load images. */
+               try {
+                       configurationSoneParser.parseImages(this);
+               } catch (InvalidImageFound iif) {
+                       logger.log(WARNING, "Invalid image found, aborting load!");
+                       return;
+               } catch (InvalidParentAlbumFound ipaf) {
+                       logger.log(Level.WARNING,
+                                       format("Invalid album image (%s) encountered, aborting load!",
+                                                       ipaf.getAlbumParentId()));
+                       return;
+               }
+
+               /* load avatar. */
+               String sonePrefix = "Sone/" + sone.getId();
+               String avatarId = configuration.getStringValue(sonePrefix + "/Profile/Avatar").getValue(null);
+               if (avatarId != null) {
+                       final Map<String, Image> images = configurationSoneParser.getImages();
+                       profile.setAvatar(images.get(avatarId));
+               }
+
+               /* load options. */
+               sone.getOptions().setAutoFollow(configuration.getBooleanValue(sonePrefix + "/Options/AutoFollow").getValue(null));
+               sone.getOptions().setSoneInsertNotificationEnabled(configuration.getBooleanValue(sonePrefix + "/Options/EnableSoneInsertNotifications").getValue(null));
+               sone.getOptions().setShowNewSoneNotifications(configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewSones").getValue(null));
+               sone.getOptions().setShowNewPostNotifications(configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewPosts").getValue(null));
+               sone.getOptions().setShowNewReplyNotifications(configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewReplies").getValue(null));
+               sone.getOptions().setShowCustomAvatars(ShowCustomAvatars.valueOf(
+                               configuration.getStringValue(sonePrefix + "/Options/ShowCustomAvatars")
+                                               .getValue(ShowCustomAvatars.NEVER.name())));
+
+               /* if we’re still here, Sone was loaded successfully. */
+               lock.writeLock().lock();
+               try {
+                       updateSoneTime(sone, soneTime);
+                       sone.setProfile(profile);
+                       sone.setLikePostIds(likedPostIds);
+                       sone.setLikeReplyIds(likedReplyIds);
+
+                       String lastInsertFingerprint = configurationLoader.getLastInsertFingerprint(sone.getId());
+                       lastInsertFingerprints.put(sone.getId(), lastInsertFingerprint);
+
+                       allSones.put(sone.getId(), sone);
+                       storePosts(sone.getId(), posts);
+                       storePostReplies(sone.getId(), postReplies);
+                       storeAlbums(sone.getId(), topLevelAlbums);
+                       storeImages(sone.getId(), from(topLevelAlbums).transformAndConcat(Album.FLATTENER).transformAndConcat(Album.IMAGES).toList());
+               } finally {
+                       lock.writeLock().unlock();
+               }
+               for (Post post : posts) {
+                       post.setKnown(true);
+               }
+               for (PostReply reply : postReplies) {
+                       reply.setKnown(true);
+               }
+
+               logger.info(String.format("Sone loaded successfully: %s", sone));
+       }
+
+       @Override
+       public String getLastInsertFingerprint(Sone sone) {
+               lock.readLock().lock();
+               try {
+                       if (!lastInsertFingerprints.containsKey(sone.getId())) {
+                               return "";
+                       }
+                       return lastInsertFingerprints.get(sone.getId());
+               } finally {
+                       lock.readLock().unlock();
+               }
+       }
+
+       @Override
+       public void setLastInsertFingerprint(Sone sone, String lastInsertFingerprint) {
+               lock.writeLock().lock();
+               try {
+                       lastInsertFingerprints.put(sone.getId(), lastInsertFingerprint);
+               } finally {
+                       lock.writeLock().unlock();
+               }
+       }
+
        /**
         * Saves the database.
         *
@@ -147,8 +332,128 @@ public class MemoryDatabase extends AbstractService implements Database {
         */
        @Override
        public void save() throws DatabaseException {
-               saveKnownPosts();
-               saveKnownPostReplies();
+               lock.writeLock().lock();
+               try {
+                       saveKnownPostReplies();
+                       for (Sone localSone : from(localSones).transform(soneLoader()).transform(Optionals.<Sone>get())) {
+                               saveSone(localSone);
+                       }
+               } finally {
+                       lock.writeLock().unlock();
+               }
+       }
+
+       private synchronized void saveSone(Sone sone) {
+               logger.log(Level.INFO, String.format("Saving Sone: %s", sone));
+               try {
+                       /* save Sone into configuration. */
+                       String sonePrefix = "Sone/" + sone.getId();
+                       configuration.getLongValue(sonePrefix + "/Time").setValue(sone.getTime());
+                       configuration.getStringValue(sonePrefix + "/LastInsertFingerprint").setValue(lastInsertFingerprints.get(sone.getId()));
+
+                       /* save profile. */
+                       Profile profile = sone.getProfile();
+                       configuration.getStringValue(sonePrefix + "/Profile/FirstName").setValue(profile.getFirstName());
+                       configuration.getStringValue(sonePrefix + "/Profile/MiddleName").setValue(profile.getMiddleName());
+                       configuration.getStringValue(sonePrefix + "/Profile/LastName").setValue(profile.getLastName());
+                       configuration.getIntValue(sonePrefix + "/Profile/BirthDay").setValue(profile.getBirthDay());
+                       configuration.getIntValue(sonePrefix + "/Profile/BirthMonth").setValue(profile.getBirthMonth());
+                       configuration.getIntValue(sonePrefix + "/Profile/BirthYear").setValue(profile.getBirthYear());
+                       configuration.getStringValue(sonePrefix + "/Profile/Avatar").setValue(profile.getAvatar());
+
+                       /* save profile fields. */
+                       int fieldCounter = 0;
+                       for (Field profileField : profile.getFields()) {
+                               String fieldPrefix = sonePrefix + "/Profile/Fields/" + fieldCounter++;
+                               configuration.getStringValue(fieldPrefix + "/Name").setValue(profileField.getName());
+                               configuration.getStringValue(fieldPrefix + "/Value").setValue(profileField.getValue());
+                       }
+                       configuration.getStringValue(sonePrefix + "/Profile/Fields/" + fieldCounter + "/Name").setValue(null);
+
+                       /* save posts. */
+                       int postCounter = 0;
+                       for (Post post : sone.getPosts()) {
+                               String postPrefix = sonePrefix + "/Posts/" + postCounter++;
+                               configuration.getStringValue(postPrefix + "/ID").setValue(post.getId());
+                               configuration.getStringValue(postPrefix + "/Recipient").setValue(post.getRecipientId().orNull());
+                               configuration.getLongValue(postPrefix + "/Time").setValue(post.getTime());
+                               configuration.getStringValue(postPrefix + "/Text").setValue(post.getText());
+                       }
+                       configuration.getStringValue(sonePrefix + "/Posts/" + postCounter + "/ID").setValue(null);
+
+                       /* save replies. */
+                       int replyCounter = 0;
+                       for (PostReply reply : sone.getReplies()) {
+                               String replyPrefix = sonePrefix + "/Replies/" + replyCounter++;
+                               configuration.getStringValue(replyPrefix + "/ID").setValue(reply.getId());
+                               configuration.getStringValue(replyPrefix + "/Post/ID").setValue(reply.getPostId());
+                               configuration.getLongValue(replyPrefix + "/Time").setValue(reply.getTime());
+                               configuration.getStringValue(replyPrefix + "/Text").setValue(reply.getText());
+                       }
+                       configuration.getStringValue(sonePrefix + "/Replies/" + replyCounter + "/ID").setValue(null);
+
+                       /* save post likes. */
+                       int postLikeCounter = 0;
+                       for (String postId : sone.getLikedPostIds()) {
+                               configuration.getStringValue(sonePrefix + "/Likes/Post/" + postLikeCounter++ + "/ID").setValue(postId);
+                       }
+                       configuration.getStringValue(sonePrefix + "/Likes/Post/" + postLikeCounter + "/ID").setValue(null);
+
+                       /* save reply likes. */
+                       int replyLikeCounter = 0;
+                       for (String replyId : sone.getLikedReplyIds()) {
+                               configuration.getStringValue(sonePrefix + "/Likes/Reply/" + replyLikeCounter++ + "/ID").setValue(replyId);
+                       }
+                       configuration.getStringValue(sonePrefix + "/Likes/Reply/" + replyLikeCounter + "/ID").setValue(null);
+
+                       /* save albums. first, collect in a flat structure, top-level first. */
+                       List<Album> albums = FluentIterable.from(sone.getRootAlbum().getAlbums()).transformAndConcat(Album.FLATTENER).toList();
+
+                       int albumCounter = 0;
+                       for (Album album : albums) {
+                               String albumPrefix = sonePrefix + "/Albums/" + albumCounter++;
+                               configuration.getStringValue(albumPrefix + "/ID").setValue(album.getId());
+                               configuration.getStringValue(albumPrefix + "/Title").setValue(album.getTitle());
+                               configuration.getStringValue(albumPrefix + "/Description").setValue(album.getDescription());
+                               configuration.getStringValue(albumPrefix + "/Parent").setValue(album.getParent().equals(sone.getRootAlbum()) ? null : album.getParent().getId());
+                               configuration.getStringValue(albumPrefix + "/AlbumImage").setValue(album.getAlbumImage() == null ? null : album.getAlbumImage().getId());
+                       }
+                       configuration.getStringValue(sonePrefix + "/Albums/" + albumCounter + "/ID").setValue(null);
+
+                       /* save images. */
+                       int imageCounter = 0;
+                       for (Album album : albums) {
+                               for (Image image : album.getImages()) {
+                                       if (!image.isInserted()) {
+                                               continue;
+                                       }
+                                       String imagePrefix = sonePrefix + "/Images/" + imageCounter++;
+                                       configuration.getStringValue(imagePrefix + "/ID").setValue(image.getId());
+                                       configuration.getStringValue(imagePrefix + "/Album").setValue(album.getId());
+                                       configuration.getStringValue(imagePrefix + "/Key").setValue(image.getKey());
+                                       configuration.getStringValue(imagePrefix + "/Title").setValue(image.getTitle());
+                                       configuration.getStringValue(imagePrefix + "/Description").setValue(image.getDescription());
+                                       configuration.getLongValue(imagePrefix + "/CreationTime").setValue(image.getCreationTime());
+                                       configuration.getIntValue(imagePrefix + "/Width").setValue(image.getWidth());
+                                       configuration.getIntValue(imagePrefix + "/Height").setValue(image.getHeight());
+                               }
+                       }
+                       configuration.getStringValue(sonePrefix + "/Images/" + imageCounter + "/ID").setValue(null);
+
+                       /* save options. */
+                       configuration.getBooleanValue(sonePrefix + "/Options/AutoFollow").setValue(sone.getOptions().isAutoFollow());
+                       configuration.getBooleanValue(sonePrefix + "/Options/EnableSoneInsertNotifications").setValue(sone.getOptions().isSoneInsertNotificationEnabled());
+                       configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewSones").setValue(sone.getOptions().isShowNewSoneNotifications());
+                       configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewPosts").setValue(sone.getOptions().isShowNewPostNotifications());
+                       configuration.getBooleanValue(sonePrefix + "/Options/ShowNotification/NewReplies").setValue(sone.getOptions().isShowNewReplyNotifications());
+                       configuration.getStringValue(sonePrefix + "/Options/ShowCustomAvatars").setValue(sone.getOptions().getShowCustomAvatars().name());
+
+                       configuration.save();
+
+                       logger.log(Level.INFO, String.format("Sone %s saved.", sone));
+               } catch (ConfigurationException ce1) {
+                       logger.log(Level.WARNING, String.format("Could not save Sone: %s", sone), ce1);
+               }
        }
 
        //
@@ -158,8 +463,10 @@ public class MemoryDatabase extends AbstractService implements Database {
        /** {@inheritDocs} */
        @Override
        protected void doStart() {
+               soneDatabase.start();
+               memoryFriendDatabase.start();
+               postDatabase.start();
                memoryBookmarkDatabase.start();
-               loadKnownPosts();
                loadKnownPostReplies();
                notifyStarted();
        }
@@ -168,6 +475,10 @@ public class MemoryDatabase extends AbstractService implements Database {
        @Override
        protected void doStop() {
                try {
+                       soneDatabase.stop();
+                       memoryFriendDatabase.stop();
+                       postDatabase.stop();
+                       memoryBookmarkDatabase.stop();
                        save();
                        notifyStopped();
                } catch (DatabaseException de1) {
@@ -177,7 +488,7 @@ public class MemoryDatabase extends AbstractService implements Database {
 
        @Override
        public SoneBuilder newSoneBuilder() {
-               return new MemorySoneBuilder();
+               return new MemorySoneBuilder(this);
        }
 
        @Override
@@ -187,36 +498,61 @@ public class MemoryDatabase extends AbstractService implements Database {
                        removeSone(sone);
 
                        allSones.put(sone.getId(), sone);
-                       sonePosts.putAll(sone.getId(), sone.getPosts());
-                       for (Post post : sone.getPosts()) {
-                               allPosts.put(post.getId(), post);
-                       }
-                       sonePostReplies.putAll(sone.getId(), sone.getReplies());
-                       for (PostReply postReply : sone.getReplies()) {
-                               allPostReplies.put(postReply.getId(), postReply);
-                       }
-                       soneAlbums.putAll(sone.getId(), toAllAlbums.apply(sone));
-                       for (Album album : toAllAlbums.apply(sone)) {
-                               allAlbums.put(album.getId(), album);
-                       }
-                       soneImages.putAll(sone.getId(), toAllImages.apply(sone));
-                       for (Image image : toAllImages.apply(sone)) {
-                               allImages.put(image.getId(), image);
-                       }
+                       storePosts(sone.getId(), sone.getPosts());
+                       storePostReplies(sone.getId(), sone.getReplies());
+                       storeAlbums(sone.getId(), toAllAlbums.apply(sone));
+                       storeImages(sone.getId(), toAllImages.apply(sone));
                } finally {
                        lock.writeLock().unlock();
                }
        }
 
        @Override
+       public boolean isSoneKnown(Sone sone) {
+               return soneDatabase.isKnownSone(sone.getId());
+       }
+
+       @Override
+       public void setSoneKnown(Sone sone) {
+               soneDatabase.setSoneKnown(sone.getId());
+       }
+
+       @Override
+       public void updateSoneTime(Sone sone, long soneTime) {
+               soneDatabase.updateSoneTime(sone.getId(), soneTime);
+       }
+
+       private void storePosts(String soneId, Collection<Post> posts) {
+               postDatabase.storePosts(soneId, posts);
+       }
+
+       private void storePostReplies(String soneId, Collection<PostReply> postReplies) {
+               sonePostReplies.putAll(soneId, postReplies);
+               for (PostReply postReply : postReplies) {
+                       allPostReplies.put(postReply.getId(), postReply);
+               }
+       }
+
+       private void storeAlbums(String soneId, Collection<Album> albums) {
+               soneAlbums.putAll(soneId, albums);
+               for (Album album : albums) {
+                       allAlbums.put(album.getId(), album);
+               }
+       }
+
+       private void storeImages(String soneId, Collection<Image> images) {
+               soneImages.putAll(soneId, images);
+               for (Image image : images) {
+                       allImages.put(image.getId(), image);
+               }
+       }
+
+       @Override
        public void removeSone(Sone sone) {
                lock.writeLock().lock();
                try {
                        allSones.remove(sone.getId());
-                       Collection<Post> removedPosts = sonePosts.removeAll(sone.getId());
-                       for (Post removedPost : removedPosts) {
-                               allPosts.remove(removedPost.getId());
-                       }
+                       postDatabase.removePostsFor(sone.getId());
                        Collection<PostReply> removedPostReplies =
                                        sonePostReplies.removeAll(sone.getId());
                        for (PostReply removedPostReply : removedPostReplies) {
@@ -238,6 +574,16 @@ public class MemoryDatabase extends AbstractService implements Database {
        }
 
        @Override
+       public Function<String, Optional<Sone>> soneLoader() {
+               return new Function<String, Optional<Sone>>() {
+                       @Override
+                       public Optional<Sone> apply(String soneId) {
+                               return getSone(soneId);
+                       }
+               };
+       }
+
+       @Override
        public Optional<Sone> getSone(String soneId) {
                lock.readLock().lock();
                try {
@@ -258,10 +604,16 @@ public class MemoryDatabase extends AbstractService implements Database {
        }
 
        @Override
-       public Collection<Sone> getLocalSones() {
+       public Collection<LocalSone> getLocalSones() {
                lock.readLock().lock();
                try {
-                       return from(allSones.values()).filter(LOCAL_SONE_FILTER).toSet();
+                       return from(allSones.values()).filter(LOCAL_SONE_FILTER).transform(new Function<Sone, LocalSone>() {
+                               @Override
+                               public LocalSone apply(Sone sone) {
+                                       // FIXME – Sones will not always implement LocalSone
+                                       return (LocalSone) sone;
+                               }
+                       }).toSet();
                } finally {
                        lock.readLock().unlock();
                }
@@ -278,6 +630,37 @@ public class MemoryDatabase extends AbstractService implements Database {
                }
        }
 
+       @Override
+       public Collection<String> getFriends(LocalSone localSone) {
+               if (!localSone.isLocal()) {
+                       return Collections.emptySet();
+               }
+               return memoryFriendDatabase.getFriends(localSone.getId());
+       }
+
+       @Override
+       public Optional<Long> getSoneFollowingTime(String remoteSoneId) {
+               return memoryFriendDatabase.getSoneFollowingTime(remoteSoneId);
+       }
+
+       @Override
+       public boolean isFriend(LocalSone localSone, String friendSoneId) {
+               if (!localSone.isLocal()) {
+                       return false;
+               }
+               return memoryFriendDatabase.isFriend(localSone.getId(), friendSoneId);
+       }
+
+       @Override
+       public void addFriend(LocalSone localSone, String friendSoneId) {
+               memoryFriendDatabase.addFriend(localSone.getId(), friendSoneId);
+       }
+
+       @Override
+       public void removeFriend(LocalSone localSone, String friendSoneId) {
+               memoryFriendDatabase.removeFriend(localSone.getId(), friendSoneId);
+       }
+
        //
        // POSTPROVIDER METHODS
        //
@@ -285,12 +668,7 @@ public class MemoryDatabase extends AbstractService implements Database {
        /** {@inheritDocs} */
        @Override
        public Optional<Post> getPost(String postId) {
-               lock.readLock().lock();
-               try {
-                       return fromNullable(allPosts.get(postId));
-               } finally {
-                       lock.readLock().unlock();
-               }
+               return postDatabase.getPost(postId);
        }
 
        /** {@inheritDocs} */
@@ -302,17 +680,7 @@ public class MemoryDatabase extends AbstractService implements Database {
        /** {@inheritDocs} */
        @Override
        public Collection<Post> getDirectedPosts(final String recipientId) {
-               lock.readLock().lock();
-               try {
-                       return from(sonePosts.values()).filter(new Predicate<Post>() {
-                               @Override
-                               public boolean apply(Post post) {
-                                       return post.getRecipientId().asSet().contains(recipientId);
-                               }
-                       }).toSet();
-               } finally {
-                       lock.readLock().unlock();
-               }
+               return postDatabase.getDirectedPosts(recipientId);
        }
 
        //
@@ -333,72 +701,14 @@ public class MemoryDatabase extends AbstractService implements Database {
        @Override
        public void storePost(Post post) {
                checkNotNull(post, "post must not be null");
-               lock.writeLock().lock();
-               try {
-                       allPosts.put(post.getId(), post);
-                       getPostsFrom(post.getSone().getId()).add(post);
-               } finally {
-                       lock.writeLock().unlock();
-               }
+               postDatabase.storePost(post);
        }
 
        /** {@inheritDocs} */
        @Override
        public void removePost(Post post) {
                checkNotNull(post, "post must not be null");
-               lock.writeLock().lock();
-               try {
-                       allPosts.remove(post.getId());
-                       getPostsFrom(post.getSone().getId()).remove(post);
-                       post.getSone().removePost(post);
-               } finally {
-                       lock.writeLock().unlock();
-               }
-       }
-
-       /** {@inheritDocs} */
-       @Override
-       public void storePosts(Sone sone, Collection<Post> posts) throws IllegalArgumentException {
-               checkNotNull(sone, "sone must not be null");
-               /* verify that all posts are from the same Sone. */
-               for (Post post : posts) {
-                       if (!sone.equals(post.getSone())) {
-                               throw new IllegalArgumentException(String.format("Post from different Sone found: %s", post));
-                       }
-               }
-
-               lock.writeLock().lock();
-               try {
-                       /* remove all posts by the Sone. */
-                       Collection<Post> oldPosts = getPostsFrom(sone.getId());
-                       for (Post post : oldPosts) {
-                               allPosts.remove(post.getId());
-                       }
-
-                       /* add new posts. */
-                       getPostsFrom(sone.getId()).addAll(posts);
-                       for (Post post : posts) {
-                               allPosts.put(post.getId(), post);
-                       }
-               } finally {
-                       lock.writeLock().unlock();
-               }
-       }
-
-       /** {@inheritDocs} */
-       @Override
-       public void removePosts(Sone sone) {
-               checkNotNull(sone, "sone must not be null");
-               lock.writeLock().lock();
-               try {
-                       /* remove all posts by the Sone. */
-                       getPostsFrom(sone.getId()).clear();
-                       for (Post post : sone.getPosts()) {
-                               allPosts.remove(post.getId());
-                       }
-               } finally {
-                       lock.writeLock().unlock();
-               }
+               postDatabase.removePost(post.getId());
        }
 
        //
@@ -460,32 +770,6 @@ public class MemoryDatabase extends AbstractService implements Database {
 
        /** {@inheritDocs} */
        @Override
-       public void storePostReplies(Sone sone, Collection<PostReply> postReplies) {
-               checkNotNull(sone, "sone must not be null");
-               /* verify that all posts are from the same Sone. */
-               for (PostReply postReply : postReplies) {
-                       if (!sone.equals(postReply.getSone())) {
-                               throw new IllegalArgumentException(String.format("PostReply from different Sone found: %s", postReply));
-                       }
-               }
-
-               lock.writeLock().lock();
-               try {
-                       /* remove all post replies of the Sone. */
-                       for (PostReply postReply : getRepliesFrom(sone.getId())) {
-                               removePostReply(postReply);
-                       }
-                       for (PostReply postReply : postReplies) {
-                               allPostReplies.put(postReply.getId(), postReply);
-                               sonePostReplies.put(postReply.getSone().getId(), postReply);
-                       }
-               } finally {
-                       lock.writeLock().unlock();
-               }
-       }
-
-       /** {@inheritDocs} */
-       @Override
        public void removePostReply(PostReply postReply) {
                lock.writeLock().lock();
                try {
@@ -495,21 +779,6 @@ public class MemoryDatabase extends AbstractService implements Database {
                }
        }
 
-       /** {@inheritDocs} */
-       @Override
-       public void removePostReplies(Sone sone) {
-               checkNotNull(sone, "sone must not be null");
-
-               lock.writeLock().lock();
-               try {
-                       for (PostReply postReply : sone.getReplies()) {
-                               removePostReply(postReply);
-                       }
-               } finally {
-                       lock.writeLock().unlock();
-               }
-       }
-
        //
        // ALBUMPROVDER METHODS
        //
@@ -640,12 +909,7 @@ public class MemoryDatabase extends AbstractService implements Database {
         * @return {@code true} if the post is known, {@code false} otherwise
         */
        boolean isPostKnown(Post post) {
-               lock.readLock().lock();
-               try {
-                       return knownPosts.contains(post.getId());
-               } finally {
-                       lock.readLock().unlock();
-               }
+               return postDatabase.isPostKnown(post.getId());
        }
 
        /**
@@ -657,16 +921,7 @@ public class MemoryDatabase extends AbstractService implements Database {
         *              {@code true} if the post is known, {@code false} otherwise
         */
        void setPostKnown(Post post, boolean known) {
-               lock.writeLock().lock();
-               try {
-                       if (known) {
-                               knownPosts.add(post.getId());
-                       } else {
-                               knownPosts.remove(post.getId());
-                       }
-               } finally {
-                       lock.writeLock().unlock();
-               }
+               postDatabase.setPostKnown(post.getId(), known);
        }
 
        /**
@@ -720,61 +975,7 @@ public class MemoryDatabase extends AbstractService implements Database {
         * @return All posts
         */
        private Collection<Post> getPostsFrom(String soneId) {
-               lock.readLock().lock();
-               try {
-                       return sonePosts.get(soneId);
-               } finally {
-                       lock.readLock().unlock();
-               }
-       }
-
-       /** Loads the known posts. */
-       private void loadKnownPosts() {
-               Set<String> knownPosts = configurationLoader.loadKnownPosts();
-               lock.writeLock().lock();
-               try {
-                       this.knownPosts.clear();
-                       this.knownPosts.addAll(knownPosts);
-               } finally {
-                       lock.writeLock().unlock();
-               }
-       }
-
-       /**
-        * Saves the known posts to the configuration.
-        *
-        * @throws DatabaseException
-        *              if a configuration error occurs
-        */
-       private void saveKnownPosts() throws DatabaseException {
-               lock.readLock().lock();
-               try {
-                       int postCounter = 0;
-                       for (String knownPostId : knownPosts) {
-                               configuration.getStringValue("KnownPosts/" + postCounter++ + "/ID").setValue(knownPostId);
-                       }
-                       configuration.getStringValue("KnownPosts/" + postCounter + "/ID").setValue(null);
-               } catch (ConfigurationException ce1) {
-                       throw new DatabaseException("Could not save database.", ce1);
-               } finally {
-                       lock.readLock().unlock();
-               }
-       }
-
-       /**
-        * Returns all replies by the given Sone.
-        *
-        * @param id
-        *              The ID of the Sone
-        * @return The post replies of the Sone, sorted by time (newest first)
-        */
-       private Collection<PostReply> getRepliesFrom(String id) {
-               lock.readLock().lock();
-               try {
-                       return unmodifiableCollection(sonePostReplies.get(id));
-               } finally {
-                       lock.readLock().unlock();
-               }
+               return postDatabase.getPostsFrom(soneId);
        }
 
        /** Loads the known post replies. */
@@ -800,7 +1001,8 @@ public class MemoryDatabase extends AbstractService implements Database {
                try {
                        int replyCounter = 0;
                        for (String knownReplyId : knownPostReplies) {
-                               configuration.getStringValue("KnownReplies/" + replyCounter++ + "/ID").setValue(knownReplyId);
+                               configuration.getStringValue("KnownReplies/" + replyCounter++ + "/ID").setValue(
+                                               knownReplyId);
                        }
                        configuration.getStringValue("KnownReplies/" + replyCounter + "/ID").setValue(null);
                } catch (ConfigurationException ce1) {