org.apache.rocketmq.example.quickstart.Producer Maven / Gradle / Ivy
/*
* 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 org.apache.rocketmq.example.quickstart;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;
/**
* This class demonstrates how to send messages to brokers using provided {@link DefaultMQProducer}.
*/
public class Producer {
/**
* The number of produced messages.
*/
public static final int MESSAGE_COUNT = 1000;
public static final String PRODUCER_GROUP = "please_rename_unique_group_name";
public static final String DEFAULT_NAMESRVADDR = "127.0.0.1:9876";
public static final String TOPIC = "TopicTest";
public static final String TAG = "TagA";
public static void main(String[] args) throws MQClientException, InterruptedException {
/*
* Instantiate with a producer group name.
*/
DefaultMQProducer producer = new DefaultMQProducer(PRODUCER_GROUP);
/*
* Specify name server addresses.
*
* Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR
*
* {@code
* producer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");
* }
*
*/
// Uncomment the following line while debugging, namesrvAddr should be set to your local address
// producer.setNamesrvAddr(DEFAULT_NAMESRVADDR);
/*
* Launch the instance.
*/
producer.start();
for (int i = 0; i < MESSAGE_COUNT; i++) {
try {
/*
* Create a message instance, specifying topic, tag and message body.
*/
Message msg = new Message(TOPIC /* Topic */,
TAG /* Tag */,
("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
);
/*
* Call send message to deliver message to one of brokers.
*/
SendResult sendResult = producer.send(msg);
/*
* There are different ways to send message, if you don't care about the send result,you can use this way
* {@code
* producer.sendOneway(msg);
* }
*/
/*
* if you want to get the send result in a synchronize way, you can use this send method
* {@code
* SendResult sendResult = producer.send(msg);
* System.out.printf("%s%n", sendResult);
* }
*/
/*
* if you want to get the send result in a asynchronize way, you can use this send method
* {@code
*
* producer.send(msg, new SendCallback() {
* @Override
* public void onSuccess(SendResult sendResult) {
* // do something
* }
*
* @Override
* public void onException(Throwable e) {
* // do something
* }
*});
*
*}
*/
System.out.printf("%s%n", sendResult);
} catch (Exception e) {
e.printStackTrace();
Thread.sleep(1000);
}
}
/*
* Shut down once the producer instance is no longer in use.
*/
producer.shutdown();
}
}