春季集成：應用程序泄漏SimpleAsyncTaskExecutor線程？

Question

我們在生產中有一個Spring應用程序，看來它正在泄漏線程。

當我執行線程轉儲時，我看到以下似乎正在等待的線程。 下面是一個示例，但是有成千上萬個

    "SimpleAsyncTaskExecutor-1801" prio=10 tid=0x00007fa668413800 nid=0x376c waiting on condition [0x00007fa4fbaff000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000007777e2ba8> (a java.util.concurrent.CountDownLatch$Sync)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
        at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)
        at org.springframework.integration.core.MessagingTemplate$TemporaryReplyChannel.receive(MessagingTemplate.java:415)
        at org.springframework.integration.core.MessagingTemplate$TemporaryReplyChannel.receive(MessagingTemplate.java:409)
        at org.springframework.integration.core.MessagingTemplate.doReceive(MessagingTemplate.java:317)
        at org.springframework.integration.core.MessagingTemplate.doSendAndReceive(MessagingTemplate.java:341)
        at org.springframework.integration.core.MessagingTemplate.sendAndReceive(MessagingTemplate.java:255)
        at org.springframework.integration.core.MessagingTemplate.convertSendAndReceive(MessagingTemplate.java:290)
        at org.springframework.integration.gateway.MessagingGatewaySupport.doSendAndReceive(MessagingGatewaySupport.java:224)
        at org.springframework.integration.gateway.MessagingGatewaySupport.sendAndReceive(MessagingGatewaySupport.java:203)
        at org.springframework.integration.gateway.GatewayProxyFactoryBean.invokeGatewayMethod(GatewayProxyFactoryBean.java:306)
        at org.springframework.integration.gateway.GatewayProxyFactoryBean.doInvoke(GatewayProxyFactoryBean.java:269)
        at org.springframework.integration.gateway.GatewayProxyFactoryBean.access$200(GatewayProxyFactoryBean.java:71)
        at org.springframework.integration.gateway.GatewayProxyFactoryBean$AsyncInvocationTask.call(GatewayProxyFactoryBean.java:499)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.lang.Thread.run(Thread.java:745)

最終，它達到導致服務器無響應的狀態，只有重啟才能將其恢復。

這似乎與Spring Integration Gateway有關，該網關發送了一條消息，並在等待一些從未得到的答案。 我們應用程序中唯一使用此消息的地方是一個通知通道，該通知通道使用服務接口將這些消息發送（發布）到RabbitMQ交換。

這是服務接口代碼：

@Component
public interface INotificationSender {

    Future<Void> sendNotification(@Payload Object notification,
            @Header("routingKey") String routingKey,
            @Header("notificationType") String type);
}

這是相關的彈簧配置：

<!-- Spring Integration RabbitMQ adapter -->        
<rabbit:template
    id="amqpTemplate"
    connection-factory="notificationConnectionFactory" />

<rabbit:connection-factory
    id="notificationConnectionFactory"
    addresses="${notificationChannel.rabbitHost1}:${notificationChannel.rabbitPort}, ${notificationChannel.rabbitHost2}:${notificationChannel.rabbitPort}"
    username="${notificationChannel.rabbitUsername}"
    password="${notificationChannel.rabbitPassword}"
    virtual-host="${notificationChannel.rabbitVirtualHost}"/>

<rabbit:topic-exchange
    name="notificationExchange"/>


<!-- Spring Integration AMQP -->        
<int-amqp:outbound-channel-adapter 
    id="notificationChannelAdapter"
    channel="notificationChannelEnc"
    exchange-name="notificationExchange"
    routing-key-expression="headers['routingKey']"
    mapped-request-headers="STANDARD_REQUEST_HEADERS, notificationType"/>


<!-- Spring Integration Core -->
<int:channel
    id="notificationChannelEnc">
    <int:interceptors>
        <int:wire-tap channel="loggingChannel" />
    </int:interceptors>
</int:channel>

<int:channel id="notificationChannel"/>

<int:object-to-json-transformer
    id="NotificationEncoder"
    content-type="text/x-json"
    input-channel="notificationChannel"
    output-channel="notificationChannelEnc"/>       

<int:gateway
    id="notificationGateway"
    default-request-channel="notificationChannel"
    service-interface="com.ericsson.ericloud.commander.notification.sender.INotificationSender"/>

我們正在使用Spring版本3.2.3.RELEASE和Spring Integration版本3.0.0.M2

有人知道如何處理這些線程並使這些線程正確終止嗎？

謝謝，/ Sebastien

Answer 1

您的Future<Void>是一個瓶頸。

我可以猜到您要異步發送通知，而不必等待任何回復。 但是無論如何， Gateway嘗試等待答復，因為它將“ Future視為啟動異步過程的提示。

為了克服它，您必須將return更改為簡單的void並將ExecutorChannel用作網關的default-request-channel 。

請參閱《 參考手冊》中的更多信息。