ThreadPoolTask​​Executor和JMS中只使用了一个线程

Question

我在JBoss 5.1下有一个JMS Message Listener，由Spring配置。尽管ThreadPoolTask​​Executor配置为核心池大小为15，但我发现只有一个线程正在处理请求，而其他线程正在等待。根据{{​​3}}，我需要有一个有界的队列，但我不知道春天是如何允许我这样做的。

以下是配置：

<bean id="connectionFactory" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="java:/ConnectionFactory" />
    <property name="jndiTemplate" ref="jndiTemplate" />
</bean>

<bean id="destination" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="queue/someQueue" />
    <property name="jndiTemplate" ref="jndiTemplate" />
</bean>

<bean id="jmsReceiveDestinationResolver"
    class="org.springframework.jms.support.destination.JndiDestinationResolver">
    <property name="jndiTemplate" ref="jndiTemplate" />
</bean>

<bean id="someListener" class="com.company.SomeListener">
    <property name="..." ref="..." />
</bean>

<jms:listener-container connection-factory="connectionFactory"
    destination-type="queue" destination-resolver="jmsReceiveDestinationResolver" 
    task-executor="jmsTaskExecutor">
    <jms:listener destination="queue/someQueue" ref="messageListener" />
</jms:listener-container>

<bean name="jmsTaskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
    <property name="corePoolSize" value="15"/>
    <property name="maxPoolSize" value="50"/>       
    <property name="threadNamePrefix" value="some-queue-thread"/>
</bean>

这是14个等待线程的堆栈跟踪：

"some-queue-thread7" prio=10 tid=0x000000004dcfc800 nid=0x1d90 waiting on condition [0x00000000435f7000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x000000070f5abad8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
    at java.lang.Thread.run(Thread.java:662)

请注意，这可能类似于ThreadPoolExecutor API，但在我的情况下，核心池大小大于1.

Answer 1

Spring Reference表示您需要指定<jms:listener-container concurrency = "15" ...>的最大并发使用者数，否则为1。