import com.google.common.collect.ListMultimap;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
+import com.google.common.collect.SetMultimap;
import com.google.common.collect.SortedSetMultimap;
import com.google.common.collect.TreeMultimap;
import com.google.common.util.concurrent.AbstractService;
/** All posts by their Sones. */
private final Multimap<String, Post> sonePosts = HashMultimap.create();
+ private final SetMultimap<String, String> likedPostsBySone = HashMultimap.create();
+ private final SetMultimap<String, String> postLikingSones = HashMultimap.create();
/** All posts by their recipient. */
private final Multimap<String, Post> recipientPosts = HashMultimap.create();
}
}
+ @Override
+ public void likePost(Post post, Sone localSone) {
+ lock.writeLock().lock();
+ try {
+ likedPostsBySone.put(localSone.getId(), post.getId());
+ postLikingSones.put(post.getId(), localSone.getId());
+ } finally {
+ lock.writeLock().unlock();
+ }
+ }
+
+ @Override
+ public void unlikePost(Post post, Sone localSone) {
+ lock.writeLock().lock();
+ try {
+ likedPostsBySone.remove(localSone.getId(), post.getId());
+ postLikingSones.remove(post.getId(), localSone.getId());
+ } finally {
+ lock.writeLock().unlock();
+ }
+ }
+
+ public boolean isLiked(Post post, Sone sone) {
+ lock.readLock().lock();
+ try {
+ return likedPostsBySone.containsEntry(sone.getId(), post.getId());
+ } finally {
+ lock.readLock().unlock();
+ }
+ }
+
+ @Override
+ public Set<Sone> getLikes(Post post) {
+ lock.readLock().lock();
+ try {
+ return from(postLikingSones.get(post.getId())).transform(getSone()).transformAndConcat(this.<Sone>unwrap()).toSet();
+ } finally {
+ lock.readLock().unlock();
+ }
+ }
+
//
// POSTSTORE METHODS
//
};
}
+ private static <T> Function<Optional<T>, Iterable<T>> unwrap() {
+ return new Function<Optional<T>, Iterable<T>>() {
+ @Override
+ public Iterable<T> apply(Optional<T> input) {
+ return (input == null) ? Collections.<T>emptyList() : input.asSet();
+ }
+ };
+ }
+
}