/*
- * Sone - MemoryPostDatabase.java - Copyright © 2013 David Roden
+ * Sone - MemoryPostDatabase.java - Copyright © 2014 David Roden
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
package net.pterodactylus.sone.database.memory;
+import static com.google.common.base.Optional.fromNullable;
import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.collect.FluentIterable.from;
+import static com.google.common.collect.HashMultimap.create;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
-import java.util.UUID;
import java.util.concurrent.locks.ReadWriteLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
import net.pterodactylus.sone.data.Post;
import net.pterodactylus.sone.data.Sone;
-import net.pterodactylus.sone.data.impl.AbstractPostBuilder;
-import net.pterodactylus.sone.database.PostBuilder;
+import net.pterodactylus.sone.database.DatabaseException;
import net.pterodactylus.sone.database.PostDatabase;
-import net.pterodactylus.sone.database.SoneProvider;
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.inject.Inject;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.SetMultimap;
/**
* Memory-based {@link PostDatabase} implementation.
*/
public class MemoryPostDatabase implements PostDatabase {
- /** The lock. */
- private final ReadWriteLock lock = new ReentrantReadWriteLock();
-
- /** The Sone provider. */
- private final SoneProvider soneProvider;
-
- /** All posts by their ID. */
+ private final MemoryDatabase memoryDatabase;
+ private final ReadWriteLock readWriteLock;
+ private final Configuration configuration;
private final Map<String, Post> allPosts = new HashMap<String, Post>();
-
- /** All posts by their Sones. */
- private final Map<String, Collection<Post>> sonePosts = new HashMap<String, Collection<Post>>();
-
- /** All posts by their recipient. */
- private final Map<String, Collection<Post>> recipientPosts = new HashMap<String, Collection<Post>>();
-
- /** Whether posts are known. */
+ private final Multimap<String, Post> sonePosts = create();
+ private final SetMultimap<String, String> likedPostsBySone = create();
+ private final SetMultimap<String, String> postLikingSones = create();
+ private final Multimap<String, Post> recipientPosts = create();
private final Set<String> knownPosts = new HashSet<String>();
- /**
- * Creates a new memory database.
- *
- * @param soneProvider
- * The Sone provider
- */
- @Inject
- public MemoryPostDatabase(SoneProvider soneProvider) {
- this.soneProvider = soneProvider;
+ public MemoryPostDatabase(MemoryDatabase memoryDatabase, ReadWriteLock readWriteLock, Configuration configuration) {
+ this.memoryDatabase = memoryDatabase;
+ this.readWriteLock = readWriteLock;
+ this.configuration = configuration;
}
- //
- // POSTPROVIDER METHODS
- //
+ @Override
+ public Function<String, Optional<Post>> getPost() {
+ return new Function<String, Optional<Post>>() {
+ @Override
+ public Optional<Post> apply(String postId) {
+ return (postId == null) ? Optional.<Post>absent() : getPost(postId);
+ }
+ };
+ }
- /**
- * {@inheritDocs}
- */
@Override
public Optional<Post> getPost(String postId) {
- lock.readLock().lock();
+ readWriteLock.readLock().lock();
try {
- return Optional.fromNullable(allPosts.get(postId));
+ return fromNullable(allPosts.get(postId));
} finally {
- lock.readLock().unlock();
+ readWriteLock.readLock().unlock();
}
}
- /**
- * {@inheritDocs}
- */
@Override
public Collection<Post> getPosts(String soneId) {
- return new HashSet<Post>(getPostsFrom(soneId));
+ readWriteLock.readLock().lock();
+ try {
+ return new HashSet<Post>(sonePosts.get(soneId));
+ } finally {
+ readWriteLock.readLock().unlock();
+ }
}
- /**
- * {@inheritDocs}
- */
@Override
public Collection<Post> getDirectedPosts(String recipientId) {
- lock.readLock().lock();
+ readWriteLock.readLock().lock();
try {
Collection<Post> posts = recipientPosts.get(recipientId);
- return (posts == null) ? Collections.<Post>
emptySet() : new HashSet<Post>(posts);
+ return (posts == null) ? Collections.<Post>emptySet() : new HashSet<Post>(posts);
} finally {
- lock.readLock().unlock();
+ readWriteLock.readLock().unlock();
}
}
- //
- // POSTBUILDERFACTORY METHODS
- //
-
/**
- * {@inheritDocs}
+ * Returns whether the given post is known.
+ *
+ * @param post
+ * The post
+ * @return {@code true} if the post is known, {@code false} otherwise
*/
@Override
- public PostBuilder newPostBuilder() {
- return new MemoryPostBuilder(soneProvider);
+ public boolean isPostKnown(Post post) {
+ readWriteLock.readLock().lock();
+ try {
+ return knownPosts.contains(post.getId());
+ } finally {
+ readWriteLock.readLock().unlock();
+ }
}
- //
- // POSTSTORE METHODS
- //
-
/**
- * {@inheritDocs}
+ * Sets whether the given post is known.
+ *
+ * @param post
+ * The post
*/
@Override
+ public void setPostKnown(Post post) {
+ readWriteLock.writeLock().lock();
+ try {
+ knownPosts.add(post.getId());
+ } finally {
+ readWriteLock.writeLock().unlock();
+ }
+ }
+
+ @Override
+ public void likePost(Post post, Sone localSone) {
+ readWriteLock.writeLock().lock();
+ try {
+ likedPostsBySone.put(localSone.getId(), post.getId());
+ postLikingSones.put(post.getId(), localSone.getId());
+ } finally {
+ readWriteLock.writeLock().unlock();
+ }
+ }
+
+ @Override
+ public void unlikePost(Post post, Sone localSone) {
+ readWriteLock.writeLock().lock();
+ try {
+ likedPostsBySone.remove(localSone.getId(), post.getId());
+ postLikingSones.remove(post.getId(), localSone.getId());
+ } finally {
+ readWriteLock.writeLock().unlock();
+ }
+ }
+
+ public boolean isLiked(Post post, Sone sone) {
+ readWriteLock.readLock().lock();
+ try {
+ return likedPostsBySone.containsEntry(sone.getId(), post.getId());
+ } finally {
+ readWriteLock.readLock().unlock();
+ }
+ }
+
+ @Override
+ public Set<Sone> getLikes(Post post) {
+ readWriteLock.readLock().lock();
+ try {
+ return from(postLikingSones.get(post.getId())).transform(memoryDatabase.getSone()).transformAndConcat(MemoryDatabase.<Sone>unwrap()).toSet();
+ } finally {
+ readWriteLock.readLock().unlock();
+ }
+ }
+
+ @Override
public void storePost(Post post) {
checkNotNull(post, "post must not be null");
- lock.writeLock().lock();
+ readWriteLock.writeLock().lock();
try {
allPosts.put(post.getId(), post);
- getPostsFrom(post.getSone().getId()).add(post);
+ sonePosts.put(post.getSone().getId(), post);
if (post.getRecipientId().isPresent()) {
- getPostsTo(post.getRecipientId().get()).add(post);
+ recipientPosts.put(post.getRecipientId().get(), post);
}
} finally {
- lock.writeLock().unlock();
+ readWriteLock.writeLock().unlock();
}
}
- /**
- * {@inheritDocs}
- */
@Override
public void removePost(Post post) {
checkNotNull(post, "post must not be null");
- lock.writeLock().lock();
+ readWriteLock.writeLock().lock();
try {
allPosts.remove(post.getId());
- getPostsFrom(post.getSone().getId()).remove(post);
+ sonePosts.remove(post.getSone().getId(), post);
if (post.getRecipientId().isPresent()) {
- getPostsTo(post.getRecipientId().get()).remove(post);
+ recipientPosts.remove(post.getRecipientId().get(), post);
}
post.getSone().removePost(post);
} finally {
- lock.writeLock().unlock();
+ readWriteLock.writeLock().unlock();
}
}
- /**
- * {@inheritDocs}
- */
@Override
public void storePosts(Sone sone, Collection<Post> posts) throws IllegalArgumentException {
checkNotNull(sone, "sone must not be null");
}
}
- lock.writeLock().lock();
+ readWriteLock.writeLock().lock();
try {
/* remove all posts by the Sone. */
- getPostsFrom(sone.getId()).clear();
+ sonePosts.removeAll(sone.getId());
for (Post post : posts) {
allPosts.remove(post.getId());
if (post.getRecipientId().isPresent()) {
- getPostsTo(post.getRecipientId().get()).remove(post);
+ recipientPosts.remove(post.getRecipientId().get(), post);
}
}
/* add new posts. */
- getPostsFrom(sone.getId()).addAll(posts);
+ sonePosts.putAll(sone.getId(), posts);
for (Post post : posts) {
allPosts.put(post.getId(), post);
if (post.getRecipientId().isPresent()) {
- getPostsTo(post.getRecipientId().get()).add(post);
+ recipientPosts.put(post.getRecipientId().get(), post);
}
}
} finally {
- lock.writeLock().unlock();
+ readWriteLock.writeLock().unlock();
}
}
- /**
- * {@inheritDocs}
- */
@Override
public void removePosts(Sone sone) {
checkNotNull(sone, "sone must not be null");
- lock.writeLock().lock();
+ readWriteLock.writeLock().lock();
try {
/* remove all posts by the Sone. */
- getPostsFrom(sone.getId()).clear();
+ sonePosts.removeAll(sone.getId());
for (Post post : sone.getPosts()) {
allPosts.remove(post.getId());
if (post.getRecipientId().isPresent()) {
- getPostsTo(post.getRecipientId().get()).remove(post);
+ recipientPosts.remove(post.getRecipientId().get(), post);
}
}
} finally {
- lock.writeLock().unlock();
+ readWriteLock.writeLock().unlock();
}
}
- //
- // POSTDATABASE METHODS
- //
-
- /**
- * {@inheritDocs}
- */
- @Override
- public void loadKnownPosts(Configuration configuration, String prefix) {
- lock.writeLock().lock();
+ public void start() {
+ readWriteLock.writeLock().lock();
try {
int postCounter = 0;
while (true) {
- String knownPostId = configuration.getStringValue(prefix + postCounter++ + "/ID").getValue(null);
+ String knownPostId = configuration.getStringValue("KnownPosts/" + postCounter++ + "/ID").getValue(null);
if (knownPostId == null) {
break;
}
knownPosts.add(knownPostId);
}
} finally {
- lock.writeLock().unlock();
+ readWriteLock.writeLock().unlock();
}
}
- /**
- * {@inheritDocs}
- */
- @Override
- public void saveKnownPosts(Configuration configuration, String prefix) throws ConfigurationException {
- lock.readLock().lock();
- try {
- int postCounter = 0;
- for (String knownPostId : knownPosts) {
- configuration.getStringValue(prefix + postCounter++ + "/ID").setValue(knownPostId);
- }
- configuration.getStringValue(prefix + postCounter + "/ID").setValue(null);
- } finally {
- lock.readLock().unlock();
- }
+ public void stop() throws DatabaseException {
+ save();
}
- //
- // PACKAGE-PRIVATE METHODS
- //
-
- /**
- * Returns whether the given post is known.
- *
- * @param post
- * The post
- * @return {@code true} if the post is known, {@code false} otherwise
- */
- boolean isPostKnown(Post post) {
- lock.readLock().lock();
+ public void save() throws DatabaseException {
+ readWriteLock.readLock().lock();
try {
- return knownPosts.contains(post.getId());
- } finally {
- lock.readLock().unlock();
- }
- }
-
- /**
- * Sets whether the given post is known.
- *
- * @param post
- * The post
- * @param known
- * {@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());
+ 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.writeLock().unlock();
- }
- }
-
- //
- // PRIVATE METHODS
- //
-
- /**
- * Gets all posts for the given Sone, creating a new collection if there is
- * none yet.
- *
- * @param soneId
- * The ID of the Sone to get the posts for
- * @return All posts
- */
- private Collection<Post> getPostsFrom(String soneId) {
- Collection<Post> posts = null;
- lock.readLock().lock();
- try {
- posts = sonePosts.get(soneId);
- } finally {
- lock.readLock().unlock();
- }
- if (posts != null) {
- return posts;
- }
-
- posts = new HashSet<Post>();
- lock.writeLock().lock();
- try {
- sonePosts.put(soneId, posts);
- } finally {
- lock.writeLock().unlock();
+ readWriteLock.readLock().unlock();
}
-
- return posts;
- }
-
- /**
- * Gets all posts that are directed the given Sone, creating a new
- * collection if there is none yet.
- *
- * @param recipientId
- * The ID of the Sone to get the posts for
- * @return All posts
- */
- private Collection<Post> getPostsTo(String recipientId) {
- Collection<Post> posts = null;
- lock.readLock().lock();
- try {
- posts = recipientPosts.get(recipientId);
- } finally {
- lock.readLock().unlock();
- }
- if (posts != null) {
- return posts;
- }
-
- posts = new HashSet<Post>();
- lock.writeLock().lock();
- try {
- recipientPosts.put(recipientId, posts);
- } finally {
- lock.writeLock().unlock();
- }
-
- return posts;
- }
-
- /**
- * {@link PostBuilder} implementation that creates a {@link MemoryPost}.
- *
- * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
- */
- private class MemoryPostBuilder extends AbstractPostBuilder {
-
- /**
- * Creates a new memory post builder.
- *
- * @param soneProvider
- * The Sone provider
- */
- public MemoryPostBuilder(SoneProvider soneProvider) {
- super(soneProvider);
- }
-
- /**
- * {@inheritDocs}
- */
- @Override
- public Post build() throws IllegalStateException {
- validate();
- Post post = new MemoryPost(MemoryPostDatabase.this, soneProvider, randomId ? UUID.randomUUID().toString() : id, senderId, recipientId, currentTime ? System.currentTimeMillis() : time, text);
- post.setKnown(isPostKnown(post));
- return post;
- }
-
}
}
projects / Sone.git / blobdiff