AbstractStackxService.java

package com.prasanna.android.stacknetwork.service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.Process;

public abstract class AbstractStackxService extends Service {
  private static boolean isRunning = false;
  private Looper serviceLooper;
  private Handler serviceHandler;

  protected abstract Handler getServiceHandler(Looper looper);

  private static List<Object> toNotifyObjects = Collections.synchronizedList(new ArrayList<Object>());

  public interface OnHandlerComplete {
    void onHandleMessageFinish(Message message, Object... args);
  }

  public static boolean isRunning() {
    return isRunning;
  }

  protected static synchronized void setRunning(boolean running) {
    isRunning = running;
  }

  @Override
  public IBinder onBind(Intent intent) {
    return null;
  }

  @Override
  public void onCreate() {
    HandlerThread thread = new HandlerThread("ServiceStartArguments", Process.THREAD_PRIORITY_BACKGROUND);
    thread.start();

    serviceLooper = thread.getLooper();
    serviceHandler = getServiceHandler(serviceLooper);
  }

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    setRunning(true);

    Message msg = serviceHandler.obtainMessage();
    msg.arg1 = startId;
    serviceHandler.sendMessage(msg);

    return START_NOT_STICKY;
  }

  public static boolean registerForCompleteNotification(Object object) {
    if (object != null && isRunning()) {
      toNotifyObjects.add(object);
      return true;
    }

    return false;
  }

  protected void notifyWaitingObjectsOnComplete() {
    for (Object object : toNotifyObjects) {
      synchronized (object) {
        object.notify();
      }
    }

    toNotifyObjects.clear();
  }
}