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;
29 import net.pterodactylus.sonitus.data.Controller;
30 import net.pterodactylus.sonitus.data.Metadata;
31 import net.pterodactylus.sonitus.data.Source;
32 import net.pterodactylus.sonitus.data.event.MetadataUpdated;
33 import net.pterodactylus.sonitus.data.event.SourceFinishedEvent;
35 import com.google.common.eventbus.EventBus;
36 import com.google.inject.Inject;
39 * {@link Source} implementation that simply forwards another source and
40 * supports changing the source without letting the {@link
41 * net.pterodactylus.sonitus.data.Sink} know.
43 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
45 public class MultiSource implements Source {
48 private static final Logger logger = Logger.getLogger(MultiSource.class.getName());
51 private final EventBus eventBus;
53 /** The current source. */
54 private final AtomicReference<Source> source = new AtomicReference<Source>();
56 /** Whether the source was changed. */
57 private boolean sourceChanged;
60 * Creates a new multi source.
66 public MultiSource(EventBus eventBus) {
67 this.eventBus = eventBus;
75 * Sets the new source to use.
78 * The new source to use
80 public void setSource(Source source) {
81 checkNotNull(source, "source must not be null");
83 Source oldSource = this.source.getAndSet(source);
84 if (oldSource != null) {
85 synchronized (this.source) {
87 this.source.notifyAll();
89 eventBus.post(new MetadataUpdated(this, source.metadata()));
90 logger.info(String.format("Next Source set: %s", source));
99 public String name() {
100 return "Multisource";
104 public List<Controller<?>> controllers() {
105 return Collections.emptyList();
113 public Metadata metadata() {
114 return source.get().metadata();
118 public byte[] get(int bufferSize) throws EOFException, IOException {
121 return source.get().get(bufferSize);
122 } catch (EOFException eofe1) {
123 eventBus.post(new SourceFinishedEvent(source.get()));
124 synchronized (source) {
125 while (!sourceChanged) {
127 logger.info("Waiting for next Source...");
129 logger.info("Was notified.");
130 } catch (InterruptedException ioe1) {
131 /* ignore: we’ll end up here again if we were interrupted. */
136 synchronized (source) {
137 sourceChanged = false;