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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2016, TeleStax Inc. and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see 
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *   JBoss, Home of Professional Open Source
 *   Copyright 2007-2011, Red Hat, Inc. and individual contributors
 *   by the @authors tag. See the copyright.txt in the distribution for a
 *   full listing of individual contributors.
 *
 *   This is free software; you can redistribute it and/or modify it
 *   under the terms of the GNU Lesser General Public License as
 *   published by the Free Software Foundation; either version 2.1 of
 *   the License, or (at your option) any later version.
 *
 *   This software is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this software; if not, write to the Free
 *   Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 *   02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

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

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
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.client.api.ISessionFactory;
import org.jdiameter.common.api.app.sh.IShSessionData;
import org.jdiameter.common.impl.app.AppSessionImpl;

/**
 * @author  Alexandre Mendonca 
 * @author  Bartosz Baranowski 
 */
@SuppressWarnings("all") //3rd party lib
public abstract class ShSession extends AppSessionImpl implements NetworkReqListener, StateMachine {

    protected Lock sendAndStateLock = new ReentrantLock();

    protected transient List stateListeners = new CopyOnWriteArrayList();

    public ShSession(ISessionFactory sf, IShSessionData data) {
        super(sf, data);
    }

    @Override
    public void addStateChangeNotification(StateChangeListener listener) {
        if (!stateListeners.contains(listener)) {
            stateListeners.add(listener);
        }
    }

    @Override
    public void removeStateChangeNotification(StateChangeListener listener) {
        stateListeners.remove(listener);
    }

    @Override
    public void release() {
        //stateListeners.clear();
        super.release();
    }

}