X-Git-Url: https://git.pterodactylus.net/?p=Sone.git;a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsone%2Fdatabase%2Fmemory%2FMemoryPostDatabase.java;fp=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsone%2Fdatabase%2Fmemory%2FMemoryPostDatabase.java;h=a16a36b2a1d9a225363a6532ae6e36f9e51d80f3;hp=0000000000000000000000000000000000000000;hb=4d62892729cbce31c4fb2171ad2c2174db1d44b4;hpb=b7c6d579e0f873c0a648d865d0c838b221563080

diff --git a/src/main/java/net/pterodactylus/sone/database/memory/MemoryPostDatabase.java b/src/main/java/net/pterodactylus/sone/database/memory/MemoryPostDatabase.java
new file mode 100644
index 0000000..a16a36b
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/database/memory/MemoryPostDatabase.java
@@ -0,0 +1,301 @@
+/*
+ * 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();
+		}
+	}
+
+}