package org.jdiameter.common.impl.app.cxdx;



import java.util.List;

import java.util.concurrent.CopyOnWriteArrayList;

import java.util.concurrent.Future;

import java.util.concurrent.ScheduledThreadPoolExecutor;

import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.ReentrantLock;



import org.jdiameter.api.NetworkReqListener;

import org.jdiameter.api.app.StateChangeListener;

import org.jdiameter.api.app.StateMachine;

import org.jdiameter.common.api.app.cxdx.CxDxSessionState;

import org.jdiameter.common.api.app.cxdx.ICxDxMessageFactory;

import org.jdiameter.common.impl.app.AppSessionImpl;



/**

 * Start time:15:18:44 2009-08-17<br>

 * Project: diameter-parent<br>

 * 

 * @author <a href="mailto:baranowb@gmail.com">Bartosz Baranowski </a>

 * @author <a href="mailto:brainslog@gmail.com"> Alexandre Mendonca </a>

 */

public abstract class CxDxSession extends AppSessionImpl implements NetworkReqListener, StateMachine {



	private static final long serialVersionUID = 1L;

	public static final int _TX_TIMEOUT=30*1000;

	protected Lock sendAndStateLock = new ReentrantLock();

	protected static final ScheduledThreadPoolExecutor scheduler = new ScheduledThreadPoolExecutor(4);

	protected List<StateChangeListener> stateListeners = new CopyOnWriteArrayList<StateChangeListener>();

	protected CxDxSessionState state = CxDxSessionState.IDLE;

	protected Future timeoutTaskFuture;

	protected ICxDxMessageFactory messageFactory;



	public CxDxSession() {

		super();

	}



	public void addStateChangeNotification(StateChangeListener listener) {

		if (!stateListeners.contains(listener)) {

			stateListeners.add(listener);

		}

	}



	public void removeStateChangeNotification(StateChangeListener listener) {

		stateListeners.remove(listener);

	}



	/*

	 * (non-Javadoc)

	 * 

	 * @see org.jdiameter.api.app.AppSession#isStateless()

	 */

	public boolean isStateless() {

		//Right?

		return true;

	}



}