X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsonitus%2Fdata%2Fsource%2FMultiSource.java;fp=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsonitus%2Fdata%2Fsource%2FMultiSource.java;h=b5705d5a76e6d144a6bcb4862e4dabc7d155d1f9;hb=7188da95cfb6dc2bf140eb8ac7e4dc99a0761a97;hp=0000000000000000000000000000000000000000;hpb=3d073631242b121378ff9c60104170d13cab52d7;p=sonitus.git

diff --git a/src/main/java/net/pterodactylus/sonitus/data/source/MultiSource.java b/src/main/java/net/pterodactylus/sonitus/data/source/MultiSource.java
new file mode 100644
index 0000000..b5705d5
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+++ b/src/main/java/net/pterodactylus/sonitus/data/source/MultiSource.java
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+/*
+ * Sonitus - MultiSource.java - Copyright © 2013 David Roden
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sonitus.data.source;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.io.EOFException;
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.logging.Logger;
+
+import net.pterodactylus.sonitus.data.Metadata;
+import net.pterodactylus.sonitus.data.Source;
+import net.pterodactylus.sonitus.data.event.SourceFinishedEvent;
+
+import com.google.common.eventbus.EventBus;
+import com.google.inject.Inject;
+
+/**
+ * {@link Source} implementation that simply forwards another source and
+ * supports changing the source without letting the {@link
+ * net.pterodactylus.sonitus.data.Sink} know.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class MultiSource implements Source {
+
+	/** The logger. */
+	private static final Logger logger = Logger.getLogger(MultiSource.class.getName());
+
+	/** The event bus. */
+	private final EventBus eventBus;
+
+	/** The current source. */
+	private final AtomicReference<Source> source = new AtomicReference<Source>();
+
+	/** Whether the source was changed. */
+	private boolean sourceChanged;
+
+	@Inject
+	public MultiSource(EventBus eventBus) {
+		this.eventBus = eventBus;
+	}
+
+	//
+	// ACTIONS
+	//
+
+	/**
+	 * Sets the new source to use.
+	 *
+	 * @param source
+	 * 		The new source to use
+	 */
+	public void setSource(Source source) {
+		checkNotNull(source, "source must not be null");
+
+		Source oldSource = this.source.getAndSet(source);
+		if (oldSource != null) {
+			synchronized (this.source) {
+				sourceChanged = true;
+				this.source.notifyAll();
+			}
+			logger.info(String.format("Next Source set: %s", source));
+		}
+	}
+
+	//
+	// SOURCE METHODS
+	//
+
+	@Override
+	public Metadata metadata() {
+		return source.get().metadata();
+	}
+
+	@Override
+	public byte[] get(int bufferSize) throws EOFException, IOException {
+		while (true) {
+			try {
+				return source.get().get(bufferSize);
+			} catch (EOFException eofe1) {
+				eventBus.post(new SourceFinishedEvent(source.get()));
+				synchronized (source) {
+					while (!sourceChanged) {
+						try {
+							logger.info("Waiting for next Source...");
+							source.wait();
+							logger.info("Was notified.");
+						} catch (InterruptedException ioe1) {
+							/* ignore: we’ll end up here again if we were interrupted. */
+						}
+					}
+				}
+			} finally {
+				synchronized (source) {
+					sourceChanged = false;
+				}
+			}
+		}
+	}
+
+}