2 * Sonitus - MultiSource.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.sonitus.data.source;
20 import static com.google.common.base.Preconditions.checkNotNull;
22 import java.io.EOFException;
23 import java.io.IOException;
24 import java.util.Collections;
25 import java.util.List;
26 import java.util.concurrent.atomic.AtomicReference;
27 import java.util.logging.Logger;
28 import javax.swing.event.EventListenerList;
30 import net.pterodactylus.sonitus.data.AbstractControlledComponent;
31 import net.pterodactylus.sonitus.data.Controller;
32 import net.pterodactylus.sonitus.data.Metadata;
33 import net.pterodactylus.sonitus.data.Source;
35 import com.google.inject.Inject;
38 * {@link Source} implementation that simply forwards another source and
39 * supports changing the source without letting the {@link
40 * net.pterodactylus.sonitus.data.Sink} know.
42 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
44 public class MultiSource extends AbstractControlledComponent implements Source {
47 private static final Logger logger = Logger.getLogger(MultiSource.class.getName());
49 /** The source finished listeners. */
50 private final EventListenerList sourceFinishedListeners = new EventListenerList();
52 /** The current source. */
53 private final AtomicReference<Source> source = new AtomicReference<Source>();
55 /** Whether the source was changed. */
56 private boolean sourceChanged;
58 /** Creates a new multi source. */
60 public MultiSource() {
65 // LISTENER MANAGEMENT
69 * Adds a source finished listener to the list of registered listeners.
71 * @param sourceFinishedListener
72 * The source finished listener to add
74 public void addSourceFinishedListener(SourceFinishedListener sourceFinishedListener) {
75 sourceFinishedListeners.add(SourceFinishedListener.class, sourceFinishedListener);
79 * Removes a source finished listener from the list of registered listeners.
81 * @param sourceFinishedListener
82 * The source finished listener to remove
84 public void removeSourceFinishedListener(SourceFinishedListener sourceFinishedListener) {
85 sourceFinishedListeners.remove(SourceFinishedListener.class, sourceFinishedListener);
93 * Sets the new source to use.
96 * The new source to use
98 public void setSource(Source source) {
99 checkNotNull(source, "source must not be null");
101 Source oldSource = this.source.getAndSet(source);
102 if (!source.equals(oldSource)) {
103 synchronized (this.source) {
104 sourceChanged = true;
105 this.source.notifyAll();
107 metadataUpdated(source.metadata());
108 logger.info(String.format("Next Source set: %s", source));
117 * Notifies all registered listeners that the current source finished playing
118 * and that a new source should be {@link #setSource(Source) set}.
120 * @see SourceFinishedListener
122 private void fireSourceFinished() {
123 for (SourceFinishedListener sourceFinishedListener : sourceFinishedListeners.getListeners(SourceFinishedListener.class)) {
124 sourceFinishedListener.sourceFinished(this);
129 // CONTROLLED METHODS
133 public List<Controller<?>> controllers() {
134 return Collections.emptyList();
138 public Metadata metadata() {
139 if (super.metadata() == null) {
140 /* no metadata yet, wait for it. */
142 sourceChanged = false;
144 return super.metadata();
152 public byte[] get(int bufferSize) throws EOFException, IOException {
155 return source.get().get(bufferSize);
156 } catch (EOFException eofe1) {
159 synchronized (source) {
160 sourceChanged = false;
170 /** Waits for a new source to be {@link #setSource(Source) set}. */
171 private void waitForNewSource() {
172 fireSourceFinished();
173 synchronized (source) {
174 while (!sourceChanged) {
176 logger.info("Waiting for next Source...");
178 logger.info("Was notified.");
179 } catch (InterruptedException ioe1) {
180 /* ignore: we’ll end up here again if we were interrupted. */