spring - 从 sqs fifo 队列中获取消息后以相同的顺序执行消息
问题描述
我正在定义一个类似于下面定义的消息侦听器。消息是查询语句。消息按顺序推送到队列中,以便在推送到表时不会违反任何外键规则。当我将 maxnumberofmessages 设置为 10 时,我看到查询似乎是乱序执行的。但是,当我将其设置为 1 时,我看不到任何问题。当我将 maxnumberofmessages 设置为大于 1 的值时,如何确保以与队列中消息相同的顺序读取消息?
@Bean
public SimpleMessageListenerContainer simpleMessageListenerContainer(AmazonSQSAsync amazonSQSAsync) {
SimpleMessageListenerContainer simpleMessageListenerContainer = new SimpleMessageListenerContainer();
simpleMessageListenerContainer.setAmazonSqs);
simpleMessageListenerContainer.setMessageHandler(queueMessageHandler());
simpleMessageListenerContainer.setMaxNumberOfMessages(10);
return simpleMessageListenerContainer;
}
@SqsListener(value = "${sqs.url}", deletionPolicy = SqsMessageDeletionPolicy.ON_SUCCESS)
public void onMessage(String serviceData, @Header("MessageId") String messageId, @Header("ApproximateFirstReceiveTimestamp") String approximateFirstReceiveTimestamp) {
repository.execute(serviceData);
}
修改后的代码
@Bean
public SimpleMessageListenerContainerFactory simpleMessageListenerContainerFactory() {
SimpleMessageListenerContainerFactory msgListenerContainerFactory = new SimpleMessageListenerContainerFactory();
msgListenerContainerFactory.setAmazonSqs(amazonSQSAsyncClient());
msgListenerContainerFactory.setAutoStartup(false);
msgListenerContainerFactory.setMaxNumberOfMessages(10);
msgListenerContainerFactory.setTaskExecutor(threadPoolTaskExecutor());
return msgListenerContainerFactory;
}
@Bean
public ThreadPoolTaskExecutor threadPoolTaskExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(1);
executor.setMaxPoolSize(1);
executor.setThreadNamePrefix("queueExecutor");
executor.initialize();
return executor;
}
@SqsListener(value = "${sqs.url}", deletionPolicy = SqsMessageDeletionPolicy.ON_SUCCESS)
public void onMessage(String serviceData, @Header("MessageId") String messageId, @Header("ApproximateFirstReceiveTimestamp") String approximateFirstReceiveTimestamp) {
repository.execute(serviceData);
}
解决方案
那是因为那里的逻辑是这样的:
ReceiveMessageResult receiveMessageResult = getAmazonSqs().receiveMessage(this.queueAttributes.getReceiveMessageRequest());
CountDownLatch messageBatchLatch = new CountDownLatch(receiveMessageResult.getMessages().size());
for (Message message : receiveMessageResult.getMessages()) {
if (isQueueRunning()) {
MessageExecutor messageExecutor = new MessageExecutor(this.logicalQueueName, message, this.queueAttributes);
getTaskExecutor().execute(new SignalExecutingRunnable(messageBatchLatch, messageExecutor));
} else {
messageBatchLatch.countDown();
}
}
注意getTaskExecutor().execute()
. 这就是您的消息如何转移到它们自己的线程以执行的方式。
您可以考虑将其重新配置为ThreadPoolTaskExecutor
池大小为1
. 并且您的所有消息都将在同一个线程上处理,因此将提供订单。