Merges from master branch.

src/main/java/io/github/dsheirer/source/heartbeat/HeartbeatManager.java

@@ -0,0 +1,60 @@
+/*******************************************************************************
+ * sdrtrunk
+ * Copyright (C) 2014-2017 Dennis Sheirer
+ *
+ * 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 io.github.dsheirer.source.heartbeat;
+
+import io.github.dsheirer.sample.Broadcaster;
+import io.github.dsheirer.sample.Listener;
+
+public class HeartbeatManager
+{
+    private static final Heartbeat HEARTBEAT = new Heartbeat();
+    private Broadcaster<Heartbeat> mHeartbeatBroadcaster = new Broadcaster<>();
+
+    /**
+     * Broadcasts heartbeat as commanded and handles listener registration details.
+     */
+    public HeartbeatManager()
+    {
+    }
+
+    /**
+     * Sends a heartbeat to all registered listeners
+     */
+    public void broadcast()
+    {
+        mHeartbeatBroadcaster.broadcast(HEARTBEAT);
+    }
+
+    /**
+     * Adds the listener to receive heartbeats
+     */
+    public void addHeartbeatListener(Listener<Heartbeat> listener)
+    {
+        mHeartbeatBroadcaster.addListener(listener);
+    }
+
+    /**
+     * Removes the listener from receiving heartbeats
+     * @param listener
+     */
+    public void removeHeartbeatListener(Listener<Heartbeat> listener)
+    {
+        mHeartbeatBroadcaster.removeListener(listener);
+    }
+}