Task Queue : Thread « Development « Android

1. Android
2. Development
3. Thread

Task Queue

    
//package dk.itu.nai.util;

import java.util.LinkedList;

import android.util.Log;


/**
 * Source: http://google-ukdev.blogspot.com/2009/01/crimes-against-code-and-using-threads.html
 * 
 */
class TaskQueue {
     private LinkedList<Runnable> tasks;
     private Thread thread;
     private boolean running;
     private Runnable internalRunnable;
     
     private final String ME = "TaskQueue";
    
     private class InternalRunnable implements Runnable {
       public void run() {
         internalRun();
       }
     }
    
     public TaskQueue() {
       tasks = new LinkedList<Runnable>();
       internalRunnable = new InternalRunnable();
     }
    
     public void start() {
       if (!running) {
         thread = new Thread(internalRunnable);
         thread.setDaemon(true);
         running = true;
         thread.start();
       }
     }
    
     public void stop() {
       running = false;
     }
   
    public void addTask(Runnable task) {
      Log.d(ME, "addTask");
       synchronized(tasks) {
           tasks.addLast(task);
           tasks.notify(); // notify any waiting threads           
       }
     }
    
     private Runnable getNextTask() {
       Log.d(ME, "getNextTask");
       synchronized(tasks) {
         if (tasks.isEmpty()) {
           try {
             tasks.wait();
           } catch (InterruptedException e) {
             Log.e(ME, "Task interrupted", e);
             stop();
           }
         }
         return tasks.removeFirst();
       }
     }
    
    
     private void internalRun() {
       while(running) {
         Runnable task = getNextTask();
         try {
           task.run();
           Thread.yield();
         } catch (Throwable t) {
           Log.e(ME, "Task threw an exception", t);
         }
       }
     }
  }

   
    
    
    
  

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