+/*
+ * 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
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+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.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.locks.ReadWriteLock;
+
+import net.pterodactylus.sone.data.Post;
+import net.pterodactylus.sone.data.Sone;
+import net.pterodactylus.sone.database.DatabaseException;
+import net.pterodactylus.sone.database.PostDatabase;
+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.collect.Multimap;
+import com.google.common.collect.SetMultimap;
+
+/**
+ * Memory-based {@link PostDatabase} implementation.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class MemoryPostDatabase implements PostDatabase {
+
+ private final MemoryDatabase memoryDatabase;
+ private final ReadWriteLock readWriteLock;
+ private final Configuration configuration;
+ private final Map<String, Post> allPosts = new HashMap<String, Post>();
+ 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>();
+
+ public MemoryPostDatabase(MemoryDatabase memoryDatabase, ReadWriteLock readWriteLock, Configuration configuration) {
+ this.memoryDatabase = memoryDatabase;
+ this.readWriteLock = readWriteLock;
+ this.configuration = configuration;
+ }
+
+ @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);
+ }
+ };
+ }
+
+ @Override
+ public Optional<Post> getPost(String postId) {
+ readWriteLock.readLock().lock();
+ try {
+ return fromNullable(allPosts.get(postId));
+ } finally {
+ readWriteLock.readLock().unlock();
+ }
+ }
+
+ @Override
+ public Collection<Post> getPosts(String soneId) {
+ readWriteLock.readLock().lock();
+ try {
+ return new HashSet<Post>(sonePosts.get(soneId));
+ } finally {
+ readWriteLock.readLock().unlock();
+ }
+ }
+
+ @Override
+ public Collection<Post> getDirectedPosts(String recipientId) {
+ readWriteLock.readLock().lock();
+ try {
+ Collection<Post> posts = recipientPosts.get(recipientId);
+ return (posts == null) ? Collections.<Post>emptySet() : new HashSet<Post>(posts);
+ } finally {
+ readWriteLock.readLock().unlock();
+ }
+ }
+
+ /**
+ * Returns whether the given post is known.
+ *
+ * @param post
+ * The post
+ * @return {@code true} if the post is known, {@code false} otherwise
+ */
+ @Override
+ public boolean isPostKnown(Post post) {
+ readWriteLock.readLock().lock();
+ try {
+ return knownPosts.contains(post.getId());
+ } finally {
+ readWriteLock.readLock().unlock();
+ }
+ }
+
+ /**
+ * 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");
+ readWriteLock.writeLock().lock();
+ try {
+ allPosts.put(post.getId(), post);
+ sonePosts.put(post.getSone().getId(), post);
+ if (post.getRecipientId().isPresent()) {
+ recipientPosts.put(post.getRecipientId().get(), post);
+ }
+ } finally {
+ readWriteLock.writeLock().unlock();
+ }
+ }
+
+ @Override
+ public void removePost(Post post) {
+ checkNotNull(post, "post must not be null");
+ readWriteLock.writeLock().lock();
+ try {
+ allPosts.remove(post.getId());
+ sonePosts.remove(post.getSone().getId(), post);
+ if (post.getRecipientId().isPresent()) {
+ recipientPosts.remove(post.getRecipientId().get(), post);
+ }
+ post.getSone().removePost(post);
+ } finally {
+ readWriteLock.writeLock().unlock();
+ }
+ }
+
+ @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));
+ }
+ }
+
+ readWriteLock.writeLock().lock();
+ try {
+ /* remove all posts by the Sone. */
+ sonePosts.removeAll(sone.getId());
+ for (Post post : posts) {
+ allPosts.remove(post.getId());
+ if (post.getRecipientId().isPresent()) {
+ recipientPosts.remove(post.getRecipientId().get(), post);
+ }
+ }
+
+ /* add new posts. */
+ sonePosts.putAll(sone.getId(), posts);
+ for (Post post : posts) {
+ allPosts.put(post.getId(), post);
+ if (post.getRecipientId().isPresent()) {
+ recipientPosts.put(post.getRecipientId().get(), post);
+ }
+ }
+ } finally {
+ readWriteLock.writeLock().unlock();
+ }
+ }
+
+ @Override
+ public void removePosts(Sone sone) {
+ checkNotNull(sone, "sone must not be null");
+ readWriteLock.writeLock().lock();
+ try {
+ /* remove all posts by the Sone. */
+ sonePosts.removeAll(sone.getId());
+ for (Post post : sone.getPosts()) {
+ allPosts.remove(post.getId());
+ if (post.getRecipientId().isPresent()) {
+ recipientPosts.remove(post.getRecipientId().get(), post);
+ }
+ }
+ } finally {
+ readWriteLock.writeLock().unlock();
+ }
+ }
+
+ public void start() {
+ readWriteLock.writeLock().lock();
+ try {
+ int postCounter = 0;
+ while (true) {
+ String knownPostId = configuration.getStringValue("KnownPosts/" + postCounter++ + "/ID").getValue(null);
+ if (knownPostId == null) {
+ break;
+ }
+ knownPosts.add(knownPostId);
+ }
+ } finally {
+ readWriteLock.writeLock().unlock();
+ }
+ }
+
+ public void stop() throws DatabaseException {
+ save();
+ }
+
+ public void save() throws DatabaseException {
+ readWriteLock.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 {
+ readWriteLock.readLock().unlock();
+ }
+ }
+
+}
projects / Sone.git / commitdiff