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/*
 * RED5 Open Source Media Server - https://github.com/Red5/
 * 
 * Copyright 2006-2016 by respective authors (see below). All rights reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.red5.server.net.rtmp;

import java.lang.ref.WeakReference;

import org.red5.server.api.service.IPendingServiceCall;
import org.red5.server.net.rtmp.event.Invoke;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Can be returned to delay returning the result of invoked methods.
 * 
 * @author The Red5 Project
 * @author Joachim Bauch ([email protected])
 */
public class DeferredResult {
    /**
     * Logger
     */
    protected static Logger log = LoggerFactory.getLogger(DeferredResult.class);

    /**
     * Weak reference to used channel
     */
    private WeakReference channel;

    /**
     * Pending call object
     */
    private IPendingServiceCall call;

    /**
     * Transaction id
     */
    private int transactionId;

    /**
     * Results sent flag
     */
    private boolean resultSent = false;

    /**
     * Set the result of a method call and send to the caller.
     * 
     * @param result
     *            deferred result of the method call
     */
    public void setResult(Object result) {
        if (resultSent) {
            throw new RuntimeException("You can only set the result once.");
        }
        this.resultSent = true;
        Channel channel = this.channel.get();
        if (channel == null) {
            log.warn("The client is no longer connected.");
            return;
        }
        call.setResult(result);
        Invoke reply = new Invoke();
        reply.setCall(call);
        reply.setTransactionId(transactionId);
        channel.write(reply);
        channel.getConnection().unregisterDeferredResult(this);
    }

    /**
     * Check if the result has been sent to the client.
     * 
     * @return      * true
     * 
     * 
     *         if the result has been sent, otherwise
     * 
     *              * false
     * 
     */
    public boolean wasSent() {
        return resultSent;
    }

    /**
     * Setter for transaction id.
     *
     * @param id
     *            Invocation object identifier
     */
    public void setTransactionId(int id) {
        this.transactionId = id;
    }

    /**
     * Setter for service call.
     *
     * @param call
     *            Service call
     */
    public void setServiceCall(IPendingServiceCall call) {
        this.call = call;
    }

    /**
     * Setter for channel.
     *
     * @param channel
     *            Channel
     */
    public void setChannel(Channel channel) {
        this.channel = new WeakReference(channel);
    }

}