Pull all interfaces into a single interface: Filter.

[sonitus.git] / src / main / java / net / pterodactylus / sonitus / data / source / MultiSource.java

diff --git a/src/main/java/net/pterodactylus/sonitus/data/source/MultiSource.java b/src/main/java/net/pterodactylus/sonitus/data/source/MultiSource.java
index 6eab01e..b8afd82 100644 (file)
--- a/src/main/java/net/pterodactylus/sonitus/data/source/MultiSource.java
+++ b/src/main/java/net/pterodactylus/sonitus/data/source/MultiSource.java
@@ -25,39 +25,63 @@ import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.logging.Logger;
+import javax.swing.event.EventListenerList;
 
+import net.pterodactylus.sonitus.data.AbstractFilter;
 import net.pterodactylus.sonitus.data.Controller;
+import net.pterodactylus.sonitus.data.Filter;
 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.
+ * {@link Filter} implementation that simply forwards data from another filter
+ * and supports changing the source without letting downstream filters know.
  *
  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  */
-public class MultiSource implements Source {
+public class MultiSource extends AbstractFilter {
 
        /** The logger. */
        private static final Logger logger = Logger.getLogger(MultiSource.class.getName());
 
-       /** The event bus. */
-       private final EventBus eventBus;
+       /** The source finished listeners. */
+       private final EventListenerList sourceFinishedListeners = new EventListenerList();
 
        /** The current source. */
-       private final AtomicReference<Source> source = new AtomicReference<Source>();
+       private final AtomicReference<Filter> source = new AtomicReference<Filter>();
 
        /** Whether the source was changed. */
        private boolean sourceChanged;
 
+       /** Creates a new multi source. */
        @Inject
-       public MultiSource(EventBus eventBus) {
-               this.eventBus = eventBus;
+       public MultiSource() {
+               super("Multisource");
+       }
+
+       //
+       // LISTENER MANAGEMENT
+       //
+
+       /**
+        * Adds a source finished listener to the list of registered listeners.
+        *
+        * @param sourceFinishedListener
+        *              The source finished listener to add
+        */
+       public void addSourceFinishedListener(SourceFinishedListener sourceFinishedListener) {
+               sourceFinishedListeners.add(SourceFinishedListener.class, sourceFinishedListener);
+       }
+
+       /**
+        * Removes a source finished listener from the list of registered listeners.
+        *
+        * @param sourceFinishedListener
+        *              The source finished listener to remove
+        */
+       public void removeSourceFinishedListener(SourceFinishedListener sourceFinishedListener) {
+               sourceFinishedListeners.remove(SourceFinishedListener.class, sourceFinishedListener);
        }
 
        //
@@ -70,35 +94,53 @@ public class MultiSource implements Source {
         * @param source
         *              The new source to use
         */
-       public void setSource(Source source) {
+       public void setSource(Filter source) {
                checkNotNull(source, "source must not be null");
 
-               Source oldSource = this.source.getAndSet(source);
-               if (oldSource != null) {
+               Filter oldSource = this.source.getAndSet(source);
+               if (!source.equals(oldSource)) {
                        synchronized (this.source) {
                                sourceChanged = true;
                                this.source.notifyAll();
                        }
+                       metadataUpdated(source.metadata());
                        logger.info(String.format("Next Source set: %s", source));
                }
        }
 
        //
-       // CONTROLLED METHODS
+       // EVENT METHODS
        //
 
-       @Override
-       public List<Controller<?>> controllers() {
-               return Collections.emptyList();
+       /**
+        * Notifies all registered listeners that the current source finished playing
+        * and that a new source should be {@link #setSource(Filter) set}.
+        *
+        * @see SourceFinishedListener
+        */
+       private void fireSourceFinished() {
+               for (SourceFinishedListener sourceFinishedListener : sourceFinishedListeners.getListeners(SourceFinishedListener.class)) {
+                       sourceFinishedListener.sourceFinished(this);
+               }
        }
 
        //
-       // SOURCE METHODS
+       // FILTER METHODS
        //
 
        @Override
+       public List<Controller<?>> controllers() {
+               return Collections.emptyList();
+       }
+
+       @Override
        public Metadata metadata() {
-               return source.get().metadata();
+               if (super.metadata() == null) {
+                       /* no metadata yet, wait for it. */
+                       waitForNewSource();
+                       sourceChanged = false;
+               }
+               return super.metadata();
        }
 
        @Override
@@ -107,18 +149,7 @@ public class MultiSource implements Source {
                        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. */
-                                               }
-                                       }
-                               }
+                               waitForNewSource();
                        } finally {
                                synchronized (source) {
                                        sourceChanged = false;
@@ -127,4 +158,24 @@ public class MultiSource implements Source {
                }
        }
 
+       //
+       // PRIVATE METHODS
+       //
+
+       /** Waits for a new source to be {@link #setSource(Filter) set}. */
+       private void waitForNewSource() {
+               fireSourceFinished();
+               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. */
+                               }
+                       }
+               }
+       }
+
 }