serializing tasks

ClicksService.java

public class ClicksService extends IntentService {

    private static final String TAG = ClicksService.class.getSimpleName();

    final Object locker = new Object();

    public ClicksService(String name) {
        super(name);
    }

    public ClicksService() {
        super("ClicksService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {

        int id = intent.getIntExtra("TEST_INT", -1);

        Log.d(TAG, "intent handled: " + id);

        dispatchClicks(id);
    }

    private void dispatchClicks(final int id) {

        Log.d(TAG, "creating thread: " + id);

        new AsyncTask<Void, Void, Void>() {

            @Override
            protected Void doInBackground(Void... voids) {

                Log.d(TAG, "starting thread: " + id);

                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                return null;
            }

            @Override
            protected void onPostExecute(Void aVoid) {
                Log.d(TAG, "finished thread: " + id);
                synchronized (locker) {
                    locker.notify();
                }
            }
        }.execute();

        synchronized (locker) {
            try {
                locker.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        Log.d(TAG, "intent completed: " + id);
    }

    @Override
    public void onDestroy() {

        Log.d(TAG, "destroyed");

        super.onDestroy();
    }
}