Package com.alibaba.rocketmq.example.simple

Source Code of com.alibaba.rocketmq.example.simple.Producer

/**
* Copyright (C) 2010-2013 Alibaba Group Holding Limited
*
* 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 com.alibaba.rocketmq.example.simple;

import com.alibaba.rocketmq.client.exception.MQClientException;
import com.alibaba.rocketmq.client.producer.DefaultMQProducer;
import com.alibaba.rocketmq.client.producer.SendResult;
import com.alibaba.rocketmq.common.message.Message;


public class Producer {
    public static void main(String[] args) throws MQClientException, InterruptedException {
        /**
         * 一个应用创建一个Producer,由应用来维护此对象,可以设置为全局对象或者单例<br>
         * 注意:ProducerGroupName需要由应用来保证唯一<br>
         * ProducerGroup这个概念发送普通的消息时,作用不大,但是发送分布式事务消息时,比较关键,
         * 因为服务器会回查这个Group下的任意一个Producer
         */
        DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName");

        /**
         * Producer对象在使用之前必须要调用start初始化,初始化一次即可<br>
         * 注意:切记不可以在每次发送消息时,都调用start方法
         */
        producer.start();

        /**
         * 下面这段代码表明一个Producer对象可以发送多个topic,多个tag的消息。
         * 注意:send方法是同步调用,只要不抛异常就标识成功。但是发送成功也可会有多种状态,<br>
         * 例如消息写入Master成功,但是Slave不成功,这种情况消息属于成功,但是对于个别应用如果对消息可靠性要求极高,<br>
         * 需要对这种情况做处理。另外,消息可能会存在发送失败的情况,失败重试由应用来处理。
         */
        for (int i = 0; i < 1; i++)
            try {
                {
                    Message msg = new Message("TopicTest1",// topic
                        "TagA",// tag
                        "OrderID188",// key
                        ("Hello MetaQ").getBytes());// body
                    SendResult sendResult = producer.send(msg);
                    System.out.println(sendResult);
                }

            }
            catch (Exception e) {
                e.printStackTrace();
            }

        /**
         * 应用退出时,要调用shutdown来清理资源,关闭网络连接,从MetaQ服务器上注销自己
         * 注意:我们建议应用在JBOSS、Tomcat等容器的退出钩子里调用shutdown方法
         */
        producer.shutdown();
    }
}
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