import com.rabbitmq.client.*;
import java.io.IOException;
/**
* 验证 RabbitMQ 事务机制，发送消息时异常，调用 channel.txRollback() 进行回滚
* @author hxstrive.com 2022/3/2
*/
public class TransactionDemo2 {
/** 交换器名称 */
private final String EXCHANGE_NAME = "exchange-" + TransactionDemo2.class.getSimpleName();
/** 队列名称 */
private final String QUEUE_NAME = "queue-" + TransactionDemo2.class.getSimpleName();
public static void main(String[] args) throws Exception {
TransactionDemo2 demo = new TransactionDemo2();
demo.consumer();
demo.sender();
}
/**
* 生产者
* @throws Exception
*/
private void sender() throws Exception {
// 创建连接
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("127.0.0.1");
factory.setPort(5672);
Connection connection = factory.newConnection();
// 创建信道
Channel channel = connection.createChannel();
// 声明交换器
channel.exchangeDeclare(EXCHANGE_NAME, "topic");
// 声明队列
channel.queueDeclare(QUEUE_NAME, true, false, false, null) ;
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "*.hxstrive.com");
try {
// 开启事务
channel.txSelect();
// 发送消息
String message = "transaction message";
channel.basicPublish(EXCHANGE_NAME, "www.hxstrive.com",
false, null, message.getBytes());
// 模拟一个异常
System.out.println(1 / 0);
System.out.println("[Send] Send message ‘" + message + "’");
// 提交消息
channel.txCommit();
} catch (Exception e) {
e.printStackTrace();
// 事务回滚
channel.txRollback();
}
// 关闭连接
channel.close();
connection.close();
}
/**
* 消费者
* @throws Exception
*/
private void consumer() throws Exception {
// 创建连接
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("127.0.0.1");
factory.setPort(5672);
Connection connection = factory.newConnection();
// 创建信道
Channel channel = connection.createChannel();
// 声明交换器
channel.exchangeDeclare(EXCHANGE_NAME, "topic");
// 声明队列
channel.queueDeclare(QUEUE_NAME, true,
false, false, null) ;
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "*.hxstrive.com");
// 消费消息
System.out.println("[Consumer] Waiting for a message....");
channel.basicConsume(QUEUE_NAME, true, new DefaultConsumer(channel){
@Override
public void handleDelivery(String consumerTag, Envelope envelope,
AMQP.BasicProperties properties, byte[] body) throws IOException {
System.out.println("[Consumer] body = " + new String(body));
}
});
}
}
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