package org.hwo.tasklet;

import java.util.LinkedList;
import java.util.List;
import java.util.Stack;

import org.hwo.fifo.FiFo;

public class TaskletThread extends Thread {
	TaskletManager manager;
	Tasklet currentTasklet;
	
	public TaskletThread(TaskletManager manager) {
		this.manager = manager;
		this.currentTasklet = null;
		
		start();
	}
	
	public Tasklet getCurrentTasklet() {
		return currentTasklet;
	}
	
	private void removeFromManager(){
		manager.removeTaskletThread(this);		
	}
	
	@Override
	public void run() {
		while (true)
		{
			Tasklet tasklet = manager.pop();
			
			while (tasklet != null){
				tasklet.setStarted(true);
				manager.fireTaskletStarted(tasklet);
				currentTasklet = tasklet;
				try {
					tasklet.run();	
				} catch (Exception e){
					System.err.println("Tasklet threw Exception:");
					e.printStackTrace();
				}
				
				currentTasklet = null;
				tasklet.setStarted(false);
				manager.fireTaskletFinished(tasklet);
				
				tasklet = manager.pop();
			}
			
			synchronized (manager) {
				try {
					if (manager.getThreadPoolSize() > manager.getThreads()){
						removeFromManager();
						return;
					}
					
					manager.wait();
				} catch (InterruptedException ex){
					ex.printStackTrace();
				}
			}
			
			if (manager.isShuttingDown()){
				removeFromManager();
				return;
			}
		}
	}
	
	
}