--- /dev/null
+/*
+ * Sone - MemoryPostDatabase.java - Copyright © 2013 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.Preconditions.checkNotNull;
+
+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.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.PostDatabase;
+import net.pterodactylus.sone.database.SoneProvider;
+import net.pterodactylus.util.config.Configuration;
+import net.pterodactylus.util.config.ConfigurationException;
+
+import com.google.common.base.Optional;
+import com.google.inject.Inject;
+
+/**
+ * Memory-based {@link PostDatabase} implementation.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+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 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 Set<String> knownPosts = new HashSet<String>();
+
+ /**
+ * Creates a new memory database.
+ *
+ * @param soneProvider
+ * The Sone provider
+ */
+ @Inject
+ public MemoryPostDatabase(SoneProvider soneProvider) {
+ this.soneProvider = soneProvider;
+ }
+
+ //
+ // POSTPROVIDER METHODS
+ //
+
+ /**
+ * {@inheritDocs}
+ */
+ @Override
+ public Optional<Post> getPost(String postId) {
+ lock.readLock().lock();
+ try {
+ return Optional.fromNullable(allPosts.get(postId));
+ } finally {
+ lock.readLock().unlock();
+ }
+ }
+
+ /**
+ * {@inheritDocs}
+ */
+ @Override
+ public Collection<Post> getPosts(String soneId) {
+ return new HashSet<Post>(getPostsFrom(soneId));
+ }
+
+ /**
+ * {@inheritDocs}
+ */
+ @Override
+ public Collection<Post> getDirectedPosts(String recipientId) {
+ lock.readLock().lock();
+ try {
+ Collection<Post> posts = recipientPosts.get(recipientId);
+ return (posts == null) ? Collections.<Post> emptySet() : new HashSet<Post>(posts);
+ } finally {
+ lock.readLock().unlock();
+ }
+ }
+
+ //
+ // POSTBUILDERFACTORY METHODS
+ //
+
+ /**
+ * {@inheritDocs}
+ */
+ @Override
+ public PostBuilder newPostBuilder() {
+ return new MemoryPostBuilder(soneProvider);
+ }
+
+ //
+ // POSTSTORE METHODS
+ //
+
+ /**
+ * {@inheritDocs}
+ */
+ @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);
+ if (post.getRecipientId().isPresent()) {
+ getPostsTo(post.getRecipientId().get()).add(post);
+ }
+ } finally {
+ lock.writeLock().unlock();
+ }
+ }
+
+ /**
+ * {@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);
+ if (post.getRecipientId().isPresent()) {
+ getPostsTo(post.getRecipientId().get()).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. */
+ getPostsFrom(sone.getId()).clear();
+ for (Post post : posts) {
+ allPosts.remove(post.getId());
+ if (post.getRecipientId().isPresent()) {
+ getPostsTo(post.getRecipientId().get()).remove(post);
+ }
+ }
+
+ /* add new posts. */
+ getPostsFrom(sone.getId()).addAll(posts);
+ for (Post post : posts) {
+ allPosts.put(post.getId(), post);
+ if (post.getRecipientId().isPresent()) {
+ getPostsTo(post.getRecipientId().get()).add(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());
+ if (post.getRecipientId().isPresent()) {
+ getPostsTo(post.getRecipientId().get()).remove(post);
+ }
+ }
+ } finally {
+ lock.writeLock().unlock();
+ }
+ }
+
+ //
+ // POSTDATABASE METHODS
+ //
+
+ /**
+ * {@inheritDocs}
+ */
+ @Override
+ public void loadKnownPosts(Configuration configuration, String prefix) {
+ lock.writeLock().lock();
+ try {
+ int postCounter = 0;
+ while (true) {
+ String knownPostId = configuration.getStringValue(prefix + postCounter++ + "/ID").getValue(null);
+ if (knownPostId == null) {
+ break;
+ }
+ knownPosts.add(knownPostId);
+ }
+ } finally {
+ lock.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();
+ }
+ }
+
+ //
+ // 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();
+ 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());
+ }
+ } 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();
+ }
+
+ 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