Java tutorial
/* This file is part of Subsonic. Subsonic 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. Subsonic 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 Subsonic. If not, see <http://www.gnu.org/licenses/>. Copyright 2009 (C) Sindre Mehus */ package github.daneren2005.dsub.service; import java.util.List; import java.util.concurrent.TimeUnit; import org.apache.http.HttpResponse; import android.content.Context; import android.graphics.Bitmap; import android.support.v4.util.LruCache; import github.daneren2005.dsub.domain.ChatMessage; import github.daneren2005.dsub.domain.Genre; import github.daneren2005.dsub.domain.Indexes; import github.daneren2005.dsub.domain.JukeboxStatus; import github.daneren2005.dsub.domain.Lyrics; import github.daneren2005.dsub.domain.MusicDirectory; import github.daneren2005.dsub.domain.MusicFolder; import github.daneren2005.dsub.domain.Playlist; import github.daneren2005.dsub.domain.PodcastChannel; import github.daneren2005.dsub.domain.SearchCritera; import github.daneren2005.dsub.domain.SearchResult; import github.daneren2005.dsub.domain.Share; import github.daneren2005.dsub.domain.Version; import github.daneren2005.dsub.util.CancellableTask; import github.daneren2005.dsub.util.ProgressListener; import github.daneren2005.dsub.util.TimeLimitedCache; import github.daneren2005.dsub.util.Util; /** * @author Sindre Mehus */ public class CachedMusicService implements MusicService { private static final int MUSIC_DIR_CACHE_SIZE = 20; private static final int TTL_MUSIC_DIR = 5 * 60; // Five minutes private final MusicService musicService; private final LruCache<String, TimeLimitedCache<MusicDirectory>> cachedMusicDirectories; private final TimeLimitedCache<Boolean> cachedLicenseValid = new TimeLimitedCache<Boolean>(120, TimeUnit.SECONDS); private final TimeLimitedCache<Indexes> cachedIndexes = new TimeLimitedCache<Indexes>(60 * 60, TimeUnit.SECONDS); private final TimeLimitedCache<List<Playlist>> cachedPlaylists = new TimeLimitedCache<List<Playlist>>(3600, TimeUnit.SECONDS); private final TimeLimitedCache<List<MusicFolder>> cachedMusicFolders = new TimeLimitedCache<List<MusicFolder>>( 10 * 3600, TimeUnit.SECONDS); private final TimeLimitedCache<List<Genre>> cachedGenres = new TimeLimitedCache<List<Genre>>(10 * 3600, TimeUnit.SECONDS); private final TimeLimitedCache<List<PodcastChannel>> cachedPodcastChannels = new TimeLimitedCache<List<PodcastChannel>>( 10 * 3600, TimeUnit.SECONDS); private String restUrl; public CachedMusicService(MusicService musicService) { this.musicService = musicService; cachedMusicDirectories = new LruCache<String, TimeLimitedCache<MusicDirectory>>(MUSIC_DIR_CACHE_SIZE); } @Override public void ping(Context context, ProgressListener progressListener) throws Exception { checkSettingsChanged(context); musicService.ping(context, progressListener); } @Override public boolean isLicenseValid(Context context, ProgressListener progressListener) throws Exception { checkSettingsChanged(context); Boolean result = cachedLicenseValid.get(); if (result == null) { result = musicService.isLicenseValid(context, progressListener); cachedLicenseValid.set(result, result ? 30L * 60L : 2L * 60L, TimeUnit.SECONDS); } return result; } @Override public List<MusicFolder> getMusicFolders(boolean refresh, Context context, ProgressListener progressListener) throws Exception { checkSettingsChanged(context); if (refresh) { cachedMusicFolders.clear(); } List<MusicFolder> result = cachedMusicFolders.get(); if (result == null) { result = musicService.getMusicFolders(refresh, context, progressListener); cachedMusicFolders.set(result); } return result; } @Override public Indexes getIndexes(String musicFolderId, boolean refresh, Context context, ProgressListener progressListener) throws Exception { checkSettingsChanged(context); if (refresh) { cachedIndexes.clear(); cachedMusicFolders.clear(); cachedMusicDirectories.evictAll(); } Indexes result = cachedIndexes.get(); if (result == null) { result = musicService.getIndexes(musicFolderId, refresh, context, progressListener); cachedIndexes.set(result); } return result; } @Override public MusicDirectory getMusicDirectory(String id, String name, boolean refresh, Context context, ProgressListener progressListener) throws Exception { checkSettingsChanged(context); TimeLimitedCache<MusicDirectory> cache = refresh ? null : cachedMusicDirectories.get(id); MusicDirectory dir = cache == null ? null : cache.get(); if (dir == null) { dir = musicService.getMusicDirectory(id, name, refresh, context, progressListener); cache = new TimeLimitedCache<MusicDirectory>(TTL_MUSIC_DIR, TimeUnit.SECONDS); cache.set(dir); cachedMusicDirectories.put(id, cache); } return dir; } @Override public SearchResult search(SearchCritera criteria, Context context, ProgressListener progressListener) throws Exception { return musicService.search(criteria, context, progressListener); } @Override public MusicDirectory getPlaylist(String id, String name, Context context, ProgressListener progressListener) throws Exception { return musicService.getPlaylist(id, name, context, progressListener); } @Override public List<Playlist> getPlaylists(boolean refresh, Context context, ProgressListener progressListener) throws Exception { checkSettingsChanged(context); List<Playlist> result = refresh ? null : cachedPlaylists.get(); if (result == null) { result = musicService.getPlaylists(refresh, context, progressListener); cachedPlaylists.set(result); } return result; } @Override public void createPlaylist(String id, String name, List<MusicDirectory.Entry> entries, Context context, ProgressListener progressListener) throws Exception { cachedPlaylists.clear(); musicService.createPlaylist(id, name, entries, context, progressListener); } @Override public void deletePlaylist(String id, Context context, ProgressListener progressListener) throws Exception { musicService.deletePlaylist(id, context, progressListener); } @Override public void addToPlaylist(String id, List<MusicDirectory.Entry> toAdd, Context context, ProgressListener progressListener) throws Exception { musicService.addToPlaylist(id, toAdd, context, progressListener); } @Override public void removeFromPlaylist(String id, List<Integer> toRemove, Context context, ProgressListener progressListener) throws Exception { musicService.removeFromPlaylist(id, toRemove, context, progressListener); } @Override public void overwritePlaylist(String id, String name, int toRemove, List<MusicDirectory.Entry> toAdd, Context context, ProgressListener progressListener) throws Exception { musicService.overwritePlaylist(id, name, toRemove, toAdd, context, progressListener); } @Override public void updatePlaylist(String id, String name, String comment, boolean pub, Context context, ProgressListener progressListener) throws Exception { musicService.updatePlaylist(id, name, comment, pub, context, progressListener); } @Override public Lyrics getLyrics(String artist, String title, Context context, ProgressListener progressListener) throws Exception { return musicService.getLyrics(artist, title, context, progressListener); } @Override public void scrobble(String id, boolean submission, Context context, ProgressListener progressListener) throws Exception { musicService.scrobble(id, submission, context, progressListener); } @Override public MusicDirectory getAlbumList(String type, int size, int offset, Context context, ProgressListener progressListener) throws Exception { return musicService.getAlbumList(type, size, offset, context, progressListener); } @Override public MusicDirectory getStarredList(Context context, ProgressListener progressListener) throws Exception { return musicService.getStarredList(context, progressListener); } @Override public MusicDirectory getRandomSongs(int size, String folder, String genre, String startYear, String endYear, Context context, ProgressListener progressListener) throws Exception { return musicService.getRandomSongs(size, folder, genre, startYear, endYear, context, progressListener); } @Override public Bitmap getCoverArt(Context context, MusicDirectory.Entry entry, int size, int saveSize, ProgressListener progressListener) throws Exception { return musicService.getCoverArt(context, entry, size, saveSize, progressListener); } @Override public HttpResponse getDownloadInputStream(Context context, MusicDirectory.Entry song, long offset, int maxBitrate, CancellableTask task) throws Exception { return musicService.getDownloadInputStream(context, song, offset, maxBitrate, task); } @Override public Version getLocalVersion(Context context) throws Exception { return musicService.getLocalVersion(context); } @Override public Version getLatestVersion(Context context, ProgressListener progressListener) throws Exception { return musicService.getLatestVersion(context, progressListener); } @Override public String getVideoUrl(int maxBitrate, Context context, String id) { return musicService.getVideoUrl(maxBitrate, context, id); } @Override public String getVideoStreamUrl(String format, int maxBitrate, Context context, String id) throws Exception { return musicService.getVideoStreamUrl(format, maxBitrate, context, id); } @Override public String getHlsUrl(String id, int bitRate, Context context) throws Exception { return musicService.getHlsUrl(id, bitRate, context); } @Override public JukeboxStatus updateJukeboxPlaylist(List<String> ids, Context context, ProgressListener progressListener) throws Exception { return musicService.updateJukeboxPlaylist(ids, context, progressListener); } @Override public JukeboxStatus skipJukebox(int index, int offsetSeconds, Context context, ProgressListener progressListener) throws Exception { return musicService.skipJukebox(index, offsetSeconds, context, progressListener); } @Override public JukeboxStatus stopJukebox(Context context, ProgressListener progressListener) throws Exception { return musicService.stopJukebox(context, progressListener); } @Override public JukeboxStatus startJukebox(Context context, ProgressListener progressListener) throws Exception { return musicService.startJukebox(context, progressListener); } @Override public JukeboxStatus getJukeboxStatus(Context context, ProgressListener progressListener) throws Exception { return musicService.getJukeboxStatus(context, progressListener); } @Override public JukeboxStatus setJukeboxGain(float gain, Context context, ProgressListener progressListener) throws Exception { return musicService.setJukeboxGain(gain, context, progressListener); } @Override public void setStarred(String id, boolean starred, Context context, ProgressListener progressListener) throws Exception { musicService.setStarred(id, starred, context, progressListener); } @Override public List<Share> getShares(Context context, ProgressListener progressListener) throws Exception { return musicService.getShares(context, progressListener); } @Override public List<ChatMessage> getChatMessages(Long since, Context context, ProgressListener progressListener) throws Exception { return musicService.getChatMessages(since, context, progressListener); } @Override public void addChatMessage(String message, Context context, ProgressListener progressListener) throws Exception { musicService.addChatMessage(message, context, progressListener); } @Override public List<Genre> getGenres(boolean refresh, Context context, ProgressListener progressListener) throws Exception { checkSettingsChanged(context); List<Genre> result = refresh ? null : cachedGenres.get(); if (result == null) { result = musicService.getGenres(refresh, context, progressListener); cachedGenres.set(result); } return result; } @Override public MusicDirectory getSongsByGenre(String genre, int count, int offset, Context context, ProgressListener progressListener) throws Exception { return musicService.getSongsByGenre(genre, count, offset, context, progressListener); } @Override public List<PodcastChannel> getPodcastChannels(boolean refresh, Context context, ProgressListener progressListener) throws Exception { checkSettingsChanged(context); List<PodcastChannel> result = refresh ? null : cachedPodcastChannels.get(); if (result == null) { result = musicService.getPodcastChannels(refresh, context, progressListener); cachedPodcastChannels.set(result); } return result; } @Override public MusicDirectory getPodcastEpisodes(String id, Context context, ProgressListener progressListener) throws Exception { return musicService.getPodcastEpisodes(id, context, progressListener); } @Override public void refreshPodcasts(Context context, ProgressListener progressListener) throws Exception { musicService.refreshPodcasts(context, progressListener); } @Override public void createPodcastChannel(String url, Context context, ProgressListener progressListener) throws Exception { musicService.createPodcastChannel(url, context, progressListener); } @Override public void deletePodcastChannel(String id, Context context, ProgressListener progressListener) throws Exception { musicService.deletePodcastChannel(id, context, progressListener); } @Override public void downloadPodcastEpisode(String id, Context context, ProgressListener progressListener) throws Exception { musicService.downloadPodcastEpisode(id, context, progressListener); } @Override public void deletePodcastEpisode(String id, Context context, ProgressListener progressListener) throws Exception { musicService.deletePodcastEpisode(id, context, progressListener); } @Override public int processOfflineSyncs(final Context context, final ProgressListener progressListener) throws Exception { return musicService.processOfflineSyncs(context, progressListener); } private void checkSettingsChanged(Context context) { String newUrl = Util.getRestUrl(context, null); if (!Util.equals(newUrl, restUrl)) { cachedMusicFolders.clear(); cachedMusicDirectories.evictAll(); cachedLicenseValid.clear(); cachedIndexes.clear(); cachedPlaylists.clear(); cachedPodcastChannels.clear(); restUrl = newUrl; } } }