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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.cxdx;

import java.io.Serializable;
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.cxdx.ICxDxMessageFactory;
import org.jdiameter.common.api.app.cxdx.ICxDxSessionData;
import org.jdiameter.common.impl.app.AppSessionImpl;

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

    public static final int _TX_TIMEOUT = 30 * 1000;

    protected Lock sendAndStateLock = new ReentrantLock();

    protected transient List stateListeners = new CopyOnWriteArrayList();
    protected transient ICxDxMessageFactory messageFactory;

    //protected CxDxSessionState state = CxDxSessionState.IDLE;
    // protected Future timeoutTaskFuture;
    // this can be weird
    //protected Serializable timerId_timeout;
    protected static final String TIMER_NAME_MSG_TIMEOUT = "MSG_TIMEOUT";
    //protected Message buffer;
    protected ICxDxSessionData sessionData;

    public CxDxSession(ISessionFactory sf, ICxDxSessionData sessionData) {
        super(sf, sessionData);
        this.sessionData = sessionData;
    }

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

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

    @Override
    public boolean isStateless() {
        // Cx/Dx is always stateless
        return true;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.jdiameter.common.impl.app.AppSessionImpl#isReplicable()
     */
    @Override
    public boolean isReplicable() {
        // Cx/Dx is event based..
        return false;
    }

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

    protected void startMsgTimer() {
        try {
            sendAndStateLock.lock();
            sessionData.setTsTimerId(super.timerFacility.schedule(getSessionId(), TIMER_NAME_MSG_TIMEOUT, _TX_TIMEOUT));

        } finally {
            sendAndStateLock.unlock();
        }
    }

    protected void cancelMsgTimer() {
        try {
            sendAndStateLock.lock();
            final Serializable timerId = this.sessionData.getTsTimerId();
            if (timerId == null) {
                return;
            }
            super.timerFacility.cancel(timerId);
            this.sessionData.setTsTimerId(null);

        } finally {
            sendAndStateLock.unlock();
        }
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + ((sessionData == null) ? 0 : sessionData.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        CxDxSession other = (CxDxSession) obj;
        if (sessionData == null) {
            if (other.sessionData != null) {
                return false;
            }
        } else if (!sessionData.equals(other.sessionData)) {
            return false;
        }
        return true;
    }

}