package org.red5.server.service;

/*
 * RED5 Open Source Flash Server - http://code.google.com/p/red5/
 * 
 * Copyright (c) 2006-2010 by respective authors (see below). All rights reserved.
 * 
 * This library 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 library 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 library; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */

import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashSet;
import java.util.Set;


/**
 * Pending call is remote call operation that is in pending state. Remote calls to services
 * are asynchronous, that is, after call but before result callback remote calls are in
 * pending state.
 */
public class PendingCall extends Call implements IPendingServiceCall {
	private static final long serialVersionUID = 3219267601240355335L;
    /**
     * Result object
     */
	private Object result;

    /**
     * List of callbacks (event listeners)
     */
    private HashSet<IPendingServiceCallback> callbacks = new HashSet<IPendingServiceCallback>();

    public PendingCall() {}
    /**
     * Creates pending call with given method name
     * @param method    Method name
     */
    public PendingCall(String method) {
		super(method);
	}

    /**
     * Creates pending call with given method name and array of parameters
     * @param method    Method name
     * @param args      Parameters
     */
	public PendingCall(String method, Object[] args) {
		super(method, args);
	}

    /**
     * Creates pending call with given method name, service name and array of parametes
     *
     * @param name      Service name
     * @param method    Method name
     * @param args      Parameters
     */
	public PendingCall(String name, String method, Object[] args) {
		super(name, method, args);
	}

	/** {@inheritDoc}
	 */
	public Object getResult() {
		return result;
	}

	/** {@inheritDoc}
	 */
	public void setResult(Object result) {
		this.result = result;
		setStatus(result == null ? STATUS_SUCCESS_NULL : STATUS_SUCCESS_RESULT);
	}

	/** {@inheritDoc} */
    public void registerCallback(IPendingServiceCallback callback) {
		callbacks.add(callback);
	}

	/** {@inheritDoc} */
    public void unregisterCallback(IPendingServiceCallback callback) {
		callbacks.remove(callback);
	}

	/** {@inheritDoc} */
    public Set<IPendingServiceCallback> getCallbacks() {
		return callbacks;
	}
	@Override
	public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
		super.readExternal(in);
		result = in.readObject();
	}

	@Override
	public void writeExternal(ObjectOutput out) throws IOException {
		super.writeExternal(out);
		out.writeObject(result);
	}
}