+++ /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