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package cgeo.geocaching.utils;
import org.eclipse.jdt.annotation.NonNull;
import rx.Subscriber;
import rx.functions.Action0;
import rx.subscriptions.Subscriptions;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
/**
* Derivated class of {@link android.os.HandlerThread} with an exposed handler and a start/stop mechanism
* based on subscriptions.
*/
public class StartableHandlerThread extends HandlerThread {
private final static int START = 1;
private final static int STOP = 2;
static public interface Callback {
public void start(final Context context, final Handler handler);
public void stop();
}
// The handler and the thread are intimely linked, there will be no leak.
@SuppressLint("HandlerLeak")
private class StartableHandler extends Handler {
public StartableHandler() {
super(StartableHandlerThread.this.getLooper());
}
@Override
public void handleMessage(final Message message) {
if (callback != null) {
switch (message.what) {
case START:
callback.start((Context) message.obj, this);
break;
case STOP:
callback.stop();
break;
}
}
}
}
private Handler handler;
private Callback callback;
public StartableHandlerThread(@NonNull final String name, final int priority, final Callback callback) {
super(name, priority);
this.callback = callback;
}
public StartableHandlerThread(@NonNull final String name, final int priority) {
this(name, priority, null);
}
public synchronized Handler getHandler() {
if (handler == null) {
handler = new StartableHandler();
}
return handler;
}
public void start(final Subscriber<?> subscriber, final Context context) {
getHandler().obtainMessage(START, context).sendToTarget();
subscriber.add(Subscriptions.create(new Action0() {
@Override
public void call() {
getHandler().sendEmptyMessage(STOP);
}
}));
}
}
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