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a light weight, easy to use and high performance remoting framework based on netty.

There is a newer version: 1.6.11

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.alipay.remoting.rpc.protocol;

import java.util.concurrent.atomic.AtomicBoolean;

import com.alipay.remoting.AsyncContext;
import com.alipay.remoting.RemotingContext;

/**
 * Async biz context of Rpc.
 * 
 * @author xiaomin.cxm
 * @version $Id: RpcAsyncContext.java, v 0.1 May 16, 2016 8:23:07 PM xiaomin.cxm Exp $
 */
public class RpcAsyncContext implements AsyncContext {
    /** remoting context */
    private RemotingContext     ctx;

    /** rpc request command */
    private RpcRequestCommand   cmd;

    private RpcRequestProcessor processor;

    /** is response sent already */
    private AtomicBoolean       isResponseSentAlready = new AtomicBoolean();

    /**
     * Default constructor.
     * 
     * @param ctx
     * @param cmd
     */
    public RpcAsyncContext(final RemotingContext ctx, final RpcRequestCommand cmd,
                           final RpcRequestProcessor processor) {
        this.ctx = ctx;
        this.cmd = cmd;
        this.processor = processor;
    }

    /**
     * @see com.alipay.remoting.AsyncContext#sendResponse(java.lang.Object)
     */
    @Override
    public void sendResponse(Object responseObject) {
        if (isResponseSentAlready.compareAndSet(false, true)) {
            processor.sendResponseIfNecessary(this.ctx, cmd.getType(), processor
                .getCommandFactory().createResponse(responseObject, this.cmd));
        } else {
            throw new IllegalStateException("Should not send rpc response repeatedly!");
        }
    }
}