Use CopyOnWriteArraySet in place of ArrayList for listeners

Author: kiall

app/build.gradle

@@ -68,7 +68,7 @@ repositories {
 }
 
 dependencies {
-    compile 'ie.macinnes.htsp:android-htsp:v0.0.1a18'
+    compile 'ie.macinnes.htsp:android-htsp:v0.0.1a19'
     // Used for testing local HTSP lib builds
 //    compile(name: 'library-debug', ext: 'aar')
     compile fileTree(include: ['*.jar'], dir: 'libs')

app/src/main/java/ie/macinnes/tvheadend/sync/EpgSyncTask.java

@@ -43,10 +43,10 @@
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
-import java.util.List;
 import java.util.Queue;
 import java.util.Set;
 import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.CopyOnWriteArraySet;
 
 import ie.macinnes.htsp.HtspFileInputStream;
 import ie.macinnes.htsp.HtspMessage;
@@ -116,7 +116,7 @@ public interface Listener {
     private final HandlerThread mHandlerThread;
     private final Handler mHandler;
 
-    private final List<Listener> mListeners = new ArrayList<>();
+    private final Set<Listener> mListeners = new CopyOnWriteArraySet<>();
 
     private boolean mInitialSyncCompleted = false;