package cse308.swift.server.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.log4j.Logger;

import cse308.swift.server.thread.*;

public class LaunchContextListener implements ServletContextListener {

	static Logger logger = Logger.getLogger(LaunchContextListener.class.getName());
	private SwiftThread st = null;
	
	/**
	 * Initializes this listener when this war's context is initialized
	 */
	public void contextInitialized(ServletContextEvent sce) 
	{
		try	{
			if ( (st == null) || (!st.isAlive()) )	{
				LimitOrderRuntime lor = new LimitOrderRuntime();
				this.st = new SwiftThread(lor);
				st.start();
			} else {
				st.gracefulStop();
				st.join(2000);
			}
		} catch(Exception e)	{
			logger.warn("Unable to properly load LimitOrder_Thread! " + 
					e.getMessage() + " --cause " + e.getCause());
			e.printStackTrace();
		}
		
	}
	
	/**
	 * When this war is destroyed/stopped, stop the thread.
	 */
	public void contextDestroyed(ServletContextEvent sce) 
	{
		try {
			boolean success = st.gracefulStop();
			logger.info("Waiting for LimitOrder_Thread to complete (5 seconds) ");
			st.join(5000);
			if (success)	{
				logger.info("LimitOrder_Thread is sleeping, forcing interrupt ");
				st.interrupt();
			} else	{
				logger.fatal("LimitOrder_Thread could not be gracefully exited, Killing ");
				st.stop();
			}
		} catch (Exception e)	{
			logger.warn("Unable to properly release LimitOrder_Thread! " + 
					e.getMessage() + " --cause " + e.getCause());
			e.printStackTrace();
		}
	}

}