Question

我正在使用带有Spring Boot的Spring Cloud AWS（1.0.1.RELEASE）来运行SQS使用者。应用程序运行正常，但当它失去网络连接时（例如，如果我在笔记本电脑上运行时关闭我的WIFI），我看到控制台上的错误，应用程序永远不会恢复。它只是挂在那里，在网络可用后不再重新连接。我必须将它杀死并提起它。我如何强迫它自行恢复？

// Spring Boot entry point: 
public static void main(String[] args) {
    SpringApplication.run(MyConsumerConfiguration.class, args);
}

// Message Listener (A different class)
@MessageMapping(value = "myLogicalQueueName" )
public void receive(MyPOJO object) {

}

我在控制台看到的错误：

线程中的异常＆＃34; simpleMessageListenerContainer-1＆＃34; com.amazonaws.AmazonClientException：无法执行HTTP请求：sqs.us-east-1.amazonaws.com 在com.amazonaws.http.AmazonHttpClient.executeHelper（AmazonHttpClient.java:473）在com.amazonaws.http.AmazonHttpClient.execute（AmazonHttpClient.java:297）在com.amazonaws.services.sqs.AmazonSQSClient.invoke（AmazonSQSClient.java:2422）在com.amazonaws.services.sqs.AmazonSQSClient.receiveMessage（AmazonSQSClient.java:1130）在com.amazonaws.services.sqs.AmazonSQSAsyncClient $ 23.call（AmazonSQSAsyncClient.java:1678）在com.amazonaws.services.sqs.AmazonSQSAsyncClient $ 23.call（AmazonSQSAsyncClient.java:1676） at java.util.concurrent.FutureTask.run（FutureTask.java:266）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617）在java.lang.Thread.run（Thread.java:745

Answer 1

我刚刚弄清楚了网络连接丢失后SQS无法重新连接的问题。

实际上，org.springframework.cloud.aws.messaging.listener.SimpleMessageListenerContainer.java

的当前Spring AWS实施中似乎存在问题

private class AsynchronousMessageListener implements Runnable {

    private final QueueAttributes queueAttributes;
    private final String logicalQueueName;

    private AsynchronousMessageListener(String logicalQueueName, QueueAttributes queueAttributes) {
        this.logicalQueueName = logicalQueueName;
        this.queueAttributes = queueAttributes;
    }

    @Override
    public void run() {
        while (isRunning()) {
            ReceiveMessageResult receiveMessageResult = getAmazonSqs().receiveMessage(this.queueAttributes.getReceiveMessageRequest());
            CountDownLatch messageBatchLatch = new CountDownLatch(receiveMessageResult.getMessages().size());
            for (Message message : receiveMessageResult.getMessages()) {
                if (isRunning()) {
                    MessageExecutor messageExecutor = new MessageExecutor(this.logicalQueueName, message, this.queueAttributes);
                    getTaskExecutor().execute(new SignalExecutingRunnable(messageBatchLatch, messageExecutor));
                } else {
                    break;
                }
            }
            try {
                messageBatchLatch.await();
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }
    }
}

上面的代码旋转了一个新线程，该线程执行轮询到SQS队列以获取消息。删除网络连接后getAmazonSqs().receiveMessage(this.queueAttributes.getReceiveMessageRequest())抛出UnknownHostException，这不会在代码中处理并导致线程终止。因此，当稍后建立网络连接时，没有线程轮询队列来检索数据。

我已经为Spring提出了一个问题。以下是链接：https://github.com/spring-cloud/spring-cloud-aws/issues/82

希望这能解释一切。

丢失连接后，Spring AWS SQS重新连接

1 个答案: