2 * Sone - MemoryDatabase.java - Copyright © 2013 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.sone.database.memory;
20 import static com.google.common.base.Optional.fromNullable;
21 import static com.google.common.base.Preconditions.checkNotNull;
23 import java.util.ArrayList;
24 import java.util.Collection;
25 import java.util.Collections;
26 import java.util.Comparator;
27 import java.util.HashMap;
28 import java.util.HashSet;
29 import java.util.List;
32 import java.util.SortedSet;
33 import java.util.TreeSet;
34 import java.util.concurrent.locks.ReadWriteLock;
35 import java.util.concurrent.locks.ReentrantReadWriteLock;
37 import net.pterodactylus.sone.data.Album;
38 import net.pterodactylus.sone.data.Image;
39 import net.pterodactylus.sone.data.Post;
40 import net.pterodactylus.sone.data.PostReply;
41 import net.pterodactylus.sone.data.Reply;
42 import net.pterodactylus.sone.data.Sone;
43 import net.pterodactylus.sone.database.Database;
44 import net.pterodactylus.sone.database.DatabaseException;
45 import net.pterodactylus.sone.database.PostBuilder;
46 import net.pterodactylus.sone.database.PostDatabase;
47 import net.pterodactylus.sone.database.PostReplyBuilder;
48 import net.pterodactylus.sone.database.SoneProvider;
49 import net.pterodactylus.util.config.Configuration;
50 import net.pterodactylus.util.config.ConfigurationException;
52 import com.google.common.base.Optional;
53 import com.google.common.collect.ArrayListMultimap;
54 import com.google.common.collect.ListMultimap;
55 import com.google.common.collect.SortedSetMultimap;
56 import com.google.common.collect.TreeMultimap;
57 import com.google.common.util.concurrent.AbstractService;
58 import com.google.inject.Inject;
61 * Memory-based {@link PostDatabase} implementation.
63 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
65 public class MemoryDatabase extends AbstractService implements Database {
68 private final ReadWriteLock lock = new ReentrantReadWriteLock();
70 /** The Sone provider. */
71 private final SoneProvider soneProvider;
73 /** The configuration. */
74 private final Configuration configuration;
76 /** All posts by their ID. */
77 private final Map<String, Post> allPosts = new HashMap<String, Post>();
79 /** All posts by their Sones. */
80 private final Map<String, Collection<Post>> sonePosts = new HashMap<String, Collection<Post>>();
82 /** All posts by their recipient. */
83 private final Map<String, Collection<Post>> recipientPosts = new HashMap<String, Collection<Post>>();
85 /** Whether posts are known. */
86 private final Set<String> knownPosts = new HashSet<String>();
88 /** All post replies by their ID. */
89 private final Map<String, PostReply> allPostReplies = new HashMap<String, PostReply>();
91 /** Replies sorted by Sone. */
92 private final SortedSetMultimap<String, PostReply> sonePostReplies = TreeMultimap.create(new Comparator<String>() {
95 public int compare(String leftString, String rightString) {
96 return leftString.compareTo(rightString);
98 }, PostReply.TIME_COMPARATOR);
100 /** Replies by post. */
101 private final Map<String, SortedSet<PostReply>> postReplies = new HashMap<String, SortedSet<PostReply>>();
103 /** Whether post replies are known. */
104 private final Set<String> knownPostReplies = new HashSet<String>();
106 private final Map<String, Album> allAlbums = new HashMap<String, Album>();
108 private final ListMultimap<String, String> albumImages = ArrayListMultimap.create();
110 private final Map<String, Image> allImages = new HashMap<String, Image>();
113 * Creates a new memory database.
115 * @param soneProvider
117 * @param configuration
118 * The configuration for loading and saving elements
121 public MemoryDatabase(SoneProvider soneProvider, Configuration configuration) {
122 this.soneProvider = soneProvider;
123 this.configuration = configuration;
131 * Saves the database.
133 * @throws DatabaseException
134 * if an error occurs while saving
137 public void save() throws DatabaseException {
139 saveKnownPostReplies();
146 /** {@inheritDocs} */
148 protected void doStart() {
150 loadKnownPostReplies();
154 /** {@inheritDocs} */
156 protected void doStop() {
160 } catch (DatabaseException de1) {
166 // POSTPROVIDER METHODS
169 /** {@inheritDocs} */
171 public Optional<Post> getPost(String postId) {
172 lock.readLock().lock();
174 return fromNullable(allPosts.get(postId));
176 lock.readLock().unlock();
180 /** {@inheritDocs} */
182 public Collection<Post> getPosts(String soneId) {
183 return new HashSet<Post>(getPostsFrom(soneId));
186 /** {@inheritDocs} */
188 public Collection<Post> getDirectedPosts(String recipientId) {
189 lock.readLock().lock();
191 Collection<Post> posts = recipientPosts.get(recipientId);
192 return (posts == null) ? Collections.<Post>emptySet() : new HashSet<Post>(posts);
194 lock.readLock().unlock();
199 // POSTBUILDERFACTORY METHODS
202 /** {@inheritDocs} */
204 public PostBuilder newPostBuilder() {
205 return new MemoryPostBuilder(this, soneProvider);
212 /** {@inheritDocs} */
214 public void storePost(Post post) {
215 checkNotNull(post, "post must not be null");
216 lock.writeLock().lock();
218 allPosts.put(post.getId(), post);
219 getPostsFrom(post.getSone().getId()).add(post);
220 if (post.getRecipientId().isPresent()) {
221 getPostsTo(post.getRecipientId().get()).add(post);
224 lock.writeLock().unlock();
228 /** {@inheritDocs} */
230 public void removePost(Post post) {
231 checkNotNull(post, "post must not be null");
232 lock.writeLock().lock();
234 allPosts.remove(post.getId());
235 getPostsFrom(post.getSone().getId()).remove(post);
236 if (post.getRecipientId().isPresent()) {
237 getPostsTo(post.getRecipientId().get()).remove(post);
239 post.getSone().removePost(post);
241 lock.writeLock().unlock();
245 /** {@inheritDocs} */
247 public void storePosts(Sone sone, Collection<Post> posts) throws IllegalArgumentException {
248 checkNotNull(sone, "sone must not be null");
249 /* verify that all posts are from the same Sone. */
250 for (Post post : posts) {
251 if (!sone.equals(post.getSone())) {
252 throw new IllegalArgumentException(String.format("Post from different Sone found: %s", post));
256 lock.writeLock().lock();
258 /* remove all posts by the Sone. */
259 getPostsFrom(sone.getId()).clear();
260 for (Post post : posts) {
261 allPosts.remove(post.getId());
262 if (post.getRecipientId().isPresent()) {
263 getPostsTo(post.getRecipientId().get()).remove(post);
268 getPostsFrom(sone.getId()).addAll(posts);
269 for (Post post : posts) {
270 allPosts.put(post.getId(), post);
271 if (post.getRecipientId().isPresent()) {
272 getPostsTo(post.getRecipientId().get()).add(post);
276 lock.writeLock().unlock();
280 /** {@inheritDocs} */
282 public void removePosts(Sone sone) {
283 checkNotNull(sone, "sone must not be null");
284 lock.writeLock().lock();
286 /* remove all posts by the Sone. */
287 getPostsFrom(sone.getId()).clear();
288 for (Post post : sone.getPosts()) {
289 allPosts.remove(post.getId());
290 if (post.getRecipientId().isPresent()) {
291 getPostsTo(post.getRecipientId().get()).remove(post);
295 lock.writeLock().unlock();
300 // POSTREPLYPROVIDER METHODS
303 /** {@inheritDocs} */
305 public Optional<PostReply> getPostReply(String id) {
306 lock.readLock().lock();
308 return fromNullable(allPostReplies.get(id));
310 lock.readLock().unlock();
314 /** {@inheritDocs} */
316 public List<PostReply> getReplies(String postId) {
317 lock.readLock().lock();
319 if (!postReplies.containsKey(postId)) {
320 return Collections.emptyList();
322 return new ArrayList<PostReply>(postReplies.get(postId));
324 lock.readLock().unlock();
329 // POSTREPLYBUILDERFACTORY METHODS
332 /** {@inheritDocs} */
334 public PostReplyBuilder newPostReplyBuilder() {
335 return new MemoryPostReplyBuilder(this, soneProvider);
339 // POSTREPLYSTORE METHODS
342 /** {@inheritDocs} */
344 public void storePostReply(PostReply postReply) {
345 lock.writeLock().lock();
347 allPostReplies.put(postReply.getId(), postReply);
348 if (postReplies.containsKey(postReply.getPostId())) {
349 postReplies.get(postReply.getPostId()).add(postReply);
351 TreeSet<PostReply> replies = new TreeSet<PostReply>(Reply.TIME_COMPARATOR);
352 replies.add(postReply);
353 postReplies.put(postReply.getPostId(), replies);
356 lock.writeLock().unlock();
360 /** {@inheritDocs} */
362 public void storePostReplies(Sone sone, Collection<PostReply> postReplies) {
363 checkNotNull(sone, "sone must not be null");
364 /* verify that all posts are from the same Sone. */
365 for (PostReply postReply : postReplies) {
366 if (!sone.equals(postReply.getSone())) {
367 throw new IllegalArgumentException(String.format("PostReply from different Sone found: %s", postReply));
371 lock.writeLock().lock();
373 /* remove all post replies of the Sone. */
374 for (PostReply postReply : getRepliesFrom(sone.getId())) {
375 removePostReply(postReply);
377 for (PostReply postReply : postReplies) {
378 allPostReplies.put(postReply.getId(), postReply);
379 sonePostReplies.put(postReply.getSone().getId(), postReply);
380 if (this.postReplies.containsKey(postReply.getPostId())) {
381 this.postReplies.get(postReply.getPostId()).add(postReply);
383 TreeSet<PostReply> replies = new TreeSet<PostReply>(Reply.TIME_COMPARATOR);
384 replies.add(postReply);
385 this.postReplies.put(postReply.getPostId(), replies);
389 lock.writeLock().unlock();
393 /** {@inheritDocs} */
395 public void removePostReply(PostReply postReply) {
396 lock.writeLock().lock();
398 allPostReplies.remove(postReply.getId());
399 if (postReplies.containsKey(postReply.getPostId())) {
400 postReplies.get(postReply.getPostId()).remove(postReply);
401 if (postReplies.get(postReply.getPostId()).isEmpty()) {
402 postReplies.remove(postReply.getPostId());
406 lock.writeLock().unlock();
410 /** {@inheritDocs} */
412 public void removePostReplies(Sone sone) {
413 checkNotNull(sone, "sone must not be null");
415 lock.writeLock().lock();
417 for (PostReply postReply : sone.getReplies()) {
418 removePostReply(postReply);
421 lock.writeLock().unlock();
426 // ALBUMPROVDER METHODS
430 public Optional<Album> getAlbum(String albumId) {
431 lock.readLock().lock();
433 return fromNullable(allAlbums.get(albumId));
435 lock.readLock().unlock();
440 // ALBUMSTORE METHODS
444 public void storeAlbum(Album album) {
445 lock.writeLock().lock();
447 allAlbums.put(album.getId(), album);
449 lock.writeLock().unlock();
454 public void removeAlbum(Album album) {
455 lock.writeLock().lock();
457 allAlbums.remove(album.getId());
459 lock.writeLock().unlock();
464 // IMAGEPROVIDER METHODS
468 public Optional<Image> getImage(String imageId) {
469 lock.readLock().lock();
471 return fromNullable(allImages.get(imageId));
473 lock.readLock().unlock();
478 // IMAGESTORE METHODS
482 public void storeImage(Image image) {
483 lock.writeLock().lock();
485 allImages.put(image.getId(), image);
486 albumImages.put(image.getAlbum().getId(), image.getId());
488 lock.writeLock().unlock();
493 public void removeImage(Image image) {
494 lock.writeLock().lock();
496 allImages.remove(image.getId());
497 albumImages.remove(image.getAlbum().getId(), image.getId());
499 lock.writeLock().unlock();
504 // PACKAGE-PRIVATE METHODS
508 * Returns whether the given post is known.
512 * @return {@code true} if the post is known, {@code false} otherwise
514 boolean isPostKnown(Post post) {
515 lock.readLock().lock();
517 return knownPosts.contains(post.getId());
519 lock.readLock().unlock();
524 * Sets whether the given post is known.
529 * {@code true} if the post is known, {@code false} otherwise
531 void setPostKnown(Post post, boolean known) {
532 lock.writeLock().lock();
535 knownPosts.add(post.getId());
537 knownPosts.remove(post.getId());
540 lock.writeLock().unlock();
545 * Returns whether the given post reply is known.
549 * @return {@code true} if the given post reply is known, {@code false}
552 boolean isPostReplyKnown(PostReply postReply) {
553 lock.readLock().lock();
555 return knownPostReplies.contains(postReply.getId());
557 lock.readLock().unlock();
562 * Sets whether the given post reply is known.
567 * {@code true} if the post reply is known, {@code false} otherwise
569 void setPostReplyKnown(PostReply postReply, boolean known) {
570 lock.writeLock().lock();
573 knownPostReplies.add(postReply.getId());
575 knownPostReplies.remove(postReply.getId());
578 lock.writeLock().unlock();
587 * Gets all posts for the given Sone, creating a new collection if there is
591 * The ID of the Sone to get the posts for
594 private Collection<Post> getPostsFrom(String soneId) {
595 Collection<Post> posts = null;
596 lock.readLock().lock();
598 posts = sonePosts.get(soneId);
600 lock.readLock().unlock();
606 posts = new HashSet<Post>();
607 lock.writeLock().lock();
609 sonePosts.put(soneId, posts);
611 lock.writeLock().unlock();
618 * Gets all posts that are directed the given Sone, creating a new collection
619 * if there is none yet.
622 * The ID of the Sone to get the posts for
625 private Collection<Post> getPostsTo(String recipientId) {
626 Collection<Post> posts = null;
627 lock.readLock().lock();
629 posts = recipientPosts.get(recipientId);
631 lock.readLock().unlock();
637 posts = new HashSet<Post>();
638 lock.writeLock().lock();
640 recipientPosts.put(recipientId, posts);
642 lock.writeLock().unlock();
648 /** Loads the known posts. */
649 private void loadKnownPosts() {
650 lock.writeLock().lock();
654 String knownPostId = configuration.getStringValue("KnownPosts/" + postCounter++ + "/ID").getValue(null);
655 if (knownPostId == null) {
658 knownPosts.add(knownPostId);
661 lock.writeLock().unlock();
666 * Saves the known posts to the configuration.
668 * @throws DatabaseException
669 * if a configuration error occurs
671 private void saveKnownPosts() throws DatabaseException {
672 lock.readLock().lock();
675 for (String knownPostId : knownPosts) {
676 configuration.getStringValue("KnownPosts/" + postCounter++ + "/ID").setValue(knownPostId);
678 configuration.getStringValue("KnownPosts/" + postCounter + "/ID").setValue(null);
679 } catch (ConfigurationException ce1) {
680 throw new DatabaseException("Could not save database.", ce1);
682 lock.readLock().unlock();
687 * Returns all replies by the given Sone.
691 * @return The post replies of the Sone, sorted by time (newest first)
693 private Collection<PostReply> getRepliesFrom(String id) {
694 lock.readLock().lock();
696 if (sonePostReplies.containsKey(id)) {
697 return Collections.unmodifiableCollection(sonePostReplies.get(id));
699 return Collections.emptySet();
701 lock.readLock().unlock();
705 /** Loads the known post replies. */
706 private void loadKnownPostReplies() {
707 lock.writeLock().lock();
709 int replyCounter = 0;
711 String knownReplyId = configuration.getStringValue("KnownReplies/" + replyCounter++ + "/ID").getValue(null);
712 if (knownReplyId == null) {
715 knownPostReplies.add(knownReplyId);
718 lock.writeLock().unlock();
723 * Saves the known post replies to the configuration.
725 * @throws DatabaseException
726 * if a configuration error occurs
728 private void saveKnownPostReplies() throws DatabaseException {
729 lock.readLock().lock();
731 int replyCounter = 0;
732 for (String knownReplyId : knownPostReplies) {
733 configuration.getStringValue("KnownReplies/" + replyCounter++ + "/ID").setValue(knownReplyId);
735 configuration.getStringValue("KnownReplies/" + replyCounter + "/ID").setValue(null);
736 } catch (ConfigurationException ce1) {
737 throw new DatabaseException("Could not save database.", ce1);
739 lock.readLock().unlock();