有以下3种方式发送RocketMQ消息
- 可靠同步发送 reliable synchronous
- 可靠异步发送 reliable asynchronous
- 单向发送 one-way transmission
可靠同步发送
主要运用在比较重要一点消息传递/通知等业务
public class SyncProducer {
public static void main(String[] args) throws Exception {
DefaultMQProducer producer = new
DefaultMQProducer("test");
producer.start();
for (int i = 0; i < 100; i++) {
Message msg = new Message("TopicTest" /* Topic */,
"TagA" /* 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);
System.out.printf("%s%n", sendResult);
}
//Shut down once the producer instance is not longer in use.
producer.shutdown();
}
}
可靠异步发送
通常用于对发送消息响应时间要求更高/更快的场景
public class AsyncProducer {
public static void main(
String[] args) throws MQClientException, InterruptedException, UnsupportedEncodingException {
DefaultMQProducer producer = new DefaultMQProducer("Jodie_Daily_test");
producer.start();
producer.setRetryTimesWhenSendAsyncFailed(0);
for (int i = 0; i < 10000000; i++) {
try {
final int index = i;
Message msg = new Message("Jodie_topic_1023",
"TagA",
"OrderID188",
"Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
//重点在这里 异步发送回调
producer.send(msg, new SendCallback() {
@Override
public void onSuccess(SendResult sendResult) {
System.out.printf("%-10d OK %s %n", index, sendResult.getMsgId());
}
@Override
public void onException(Throwable e) {
System.out.printf("%-10d Exception %s %n", index, e);
e.printStackTrace();
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
producer.shutdown();
}
}
单向发送
适用于某些耗时非常短，但对可靠性要求并不高的场景，例如日志收集。
只发送消息，不等待服务器响应，只发送请求不等待应答。此方式发送消息的过程耗时非常短，一般在微秒级别。
public class OnewayProducer {
public static void main(String[] args) throws Exception{
DefaultMQProducer producer = new DefaultMQProducer("Test");
producer.start();
for (int i = 0; i < 100; i++) {
//Create a message instance, specifying topic, tag and message body.
Message msg = new Message("TopicTest" /* Topic */,
"TagA" /* Tag */,
("Hello RocketMQ " +
i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
);
//Call send message to deliver message to one of brokers.
producer.sendOneway(msg);
}
//Shut down once the producer instance is not longer in use.
producer.shutdown();
}
}