程序中新建Thread部署到WebSphere中产生的问题

Posted 2020-07-01

Thread replayReqProducerThread=new Thread(new AdjustmentReplayRequestProducer(...);

replayReqProducerThread.start();

public class AdjustmentReplayRequestProducer implements Runnable{

public void run() {

while(true){...}

} }

以上代码希望在整个context中创建单例的Producer，不停地从database获取数据，放入队列，供消费者获取。但是部署到Websphere后，每次重启application后，都会多处一个Producer。原因是停止Webapplication时，由于该Thread没有纳入到Spring Context或任何其他Websphere管理的容器中，所以没有被销毁。

正确的做法是:1)由Spring管理的ThreadPool来创建该Thread

<bean id="replayProducerTaskExecutor" 

class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">

<property name="corePoolSize" value="1"/>

<property name="maxPoolSize" value="1"/>

<property name="queueCapacity" value="1"/>

</bean>

replayProducerTaskExecutor.execute(new AdjustmentReplayRequestProducer(...));

                        2)在代码中加入

while(true){

if (Thread.currentThread().isInterrupted()) {

logger.info("producerTask is interrupted, will exit ...");

                        break; }  ...

}

Thread.sleep(retrieveFcstAdjmtFromDBInterval);

} catch (InterruptedException e) {

logger.info("error occured: ", e);

Thread.currentThread().interrupt();

}

因为WebSphere在Stop application时，会stop Spring contxt.

com.ibm.ws.runtime.component.ApplicationMgrImpl AUDIT WSVR0217I: Stopping application: ruby-ae-replay_war

com.ibm.ws.webcontainer.webapp INFO com.ibm.ws.webcontainer.webapp.WebApp log SRVE0292I: Servlet Message - [ruby-ae-replay_war#ruby-ae-replay.war]:.Closing Spring root WebApplicationContext

Spring 会调用replayProducerTaskExecutor的destroy的this.executor.shutdownNow()

ThreadPoolExecutor的shutdownNow中有interruptWorkers

 for (Worker w : workers) w.interruptIfStarted();->t.interrupt();

整个流程过后，该Produer会退出loop 循环。进而被回收

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