public class ThreadPoolTaskExecutor extends ExecutorConfigurationSupport implements SchedulingTaskExecutor
ThreadPoolExecutor
in bean style (through its "corePoolSize", "maxPoolSize", "keepAliveSeconds", "queueCapacity"
properties) and exposing it as a Spring TaskExecutor
.
This class is also well suited for management and monitoring (e.g. through JMX),
providing several useful attributes: "corePoolSize", "maxPoolSize", "keepAliveSeconds"
(all supporting updates at runtime); "poolSize", "activeCount" (for introspection only).
For an alternative, you may set up a ThreadPoolExecutor instance directly using
constructor injection, or use a factory method definition that points to the JDK 1.5
Executors
class. To expose such a raw Executor as a
Spring TaskExecutor
, simply wrap it with a
ConcurrentTaskExecutor
adapter.
NOTE: This class implements Spring's
TaskExecutor
interface as well as the JDK 1.5
Executor
interface, with the former being the primary
interface, the other just serving as secondary convenience. For this reason, the
exception handling follows the TaskExecutor contract rather than the Executor contract,
in particular regarding the TaskRejectedException
.
If you prefer native ExecutorService
exposure instead,
consider ThreadPoolExecutorFactoryBean
as an alternative to this class.
TaskExecutor
,
ThreadPoolExecutor
,
ConcurrentTaskExecutor
,
Serialized Formlogger
Constructor and Description |
---|
ThreadPoolTaskExecutor() |
Modifier and Type | Method and Description |
---|---|
protected java.util.concurrent.BlockingQueue<java.lang.Runnable> |
createQueue(int queueCapacity)
Create the BlockingQueue to use for the ThreadPoolExecutor.
|
void |
execute(java.lang.Runnable task) |
void |
execute(java.lang.Runnable task,
long startTimeout) |
int |
getActiveCount()
Return the number of currently active threads.
|
int |
getCorePoolSize()
Return the ThreadPoolExecutor's core pool size.
|
int |
getKeepAliveSeconds()
Return the ThreadPoolExecutor's keep-alive seconds.
|
int |
getMaxPoolSize()
Return the ThreadPoolExecutor's maximum pool size.
|
int |
getPoolSize()
Return the current pool size.
|
java.util.concurrent.ThreadPoolExecutor |
getThreadPoolExecutor()
Return the underlying ThreadPoolExecutor for native access.
|
protected java.util.concurrent.ExecutorService |
initializeExecutor(java.util.concurrent.ThreadFactory threadFactory,
java.util.concurrent.RejectedExecutionHandler rejectedExecutionHandler)
Create the target
ExecutorService instance. |
boolean |
prefersShortLivedTasks()
This task executor prefers short-lived work units.
|
void |
setAllowCoreThreadTimeOut(boolean allowCoreThreadTimeOut)
Specify whether to allow core threads to time out.
|
void |
setCorePoolSize(int corePoolSize)
Set the ThreadPoolExecutor's core pool size.
|
void |
setKeepAliveSeconds(int keepAliveSeconds)
Set the ThreadPoolExecutor's keep-alive seconds.
|
void |
setMaxPoolSize(int maxPoolSize)
Set the ThreadPoolExecutor's maximum pool size.
|
void |
setQueueCapacity(int queueCapacity)
Set the capacity for the ThreadPoolExecutor's BlockingQueue.
|
<T> java.util.concurrent.Future<T> |
submit(java.util.concurrent.Callable<T> task) |
java.util.concurrent.Future<?> |
submit(java.lang.Runnable task) |
afterPropertiesSet, destroy, initialize, setAwaitTerminationSeconds, setBeanName, setRejectedExecutionHandler, setThreadFactory, setThreadNamePrefix, setWaitForTasksToCompleteOnShutdown, shutdown
newThread
public void setCorePoolSize(int corePoolSize)
This setting can be modified at runtime, for example through JMX.
public int getCorePoolSize()
public void setMaxPoolSize(int maxPoolSize)
Integer.MAX_VALUE
.
This setting can be modified at runtime, for example through JMX.
public int getMaxPoolSize()
public void setKeepAliveSeconds(int keepAliveSeconds)
This setting can be modified at runtime, for example through JMX.
public int getKeepAliveSeconds()
public void setAllowCoreThreadTimeOut(boolean allowCoreThreadTimeOut)
Default is "false". Note that this feature is only available on Java 6 or above. On Java 5, consider switching to the backport-concurrent version of ThreadPoolTaskExecutor which also supports this feature.
ThreadPoolExecutor.allowCoreThreadTimeOut(boolean)
public void setQueueCapacity(int queueCapacity)
Integer.MAX_VALUE
.
Any positive value will lead to a LinkedBlockingQueue instance; any other value will lead to a SynchronousQueue instance.
LinkedBlockingQueue
,
SynchronousQueue
protected java.util.concurrent.ExecutorService initializeExecutor(java.util.concurrent.ThreadFactory threadFactory, java.util.concurrent.RejectedExecutionHandler rejectedExecutionHandler)
ExecutorConfigurationSupport
ExecutorService
instance.
Called by afterPropertiesSet
.initializeExecutor
in class ExecutorConfigurationSupport
threadFactory
- the ThreadFactory to userejectedExecutionHandler
- the RejectedExecutionHandler to useExecutorConfigurationSupport.afterPropertiesSet()
protected java.util.concurrent.BlockingQueue<java.lang.Runnable> createQueue(int queueCapacity)
A LinkedBlockingQueue instance will be created for a positive capacity value; a SynchronousQueue else.
queueCapacity
- the specified queue capacityLinkedBlockingQueue
,
SynchronousQueue
public java.util.concurrent.ThreadPoolExecutor getThreadPoolExecutor() throws java.lang.IllegalStateException
null
)java.lang.IllegalStateException
- if the ThreadPoolTaskExecutor hasn't been initialized yetpublic int getPoolSize()
ThreadPoolExecutor.getPoolSize()
public int getActiveCount()
ThreadPoolExecutor.getActiveCount()
public void execute(java.lang.Runnable task)
execute
in interface java.util.concurrent.Executor
execute
in interface org.springframework.core.task.TaskExecutor
public void execute(java.lang.Runnable task, long startTimeout)
execute
in interface org.springframework.core.task.AsyncTaskExecutor
public java.util.concurrent.Future<?> submit(java.lang.Runnable task)
submit
in interface org.springframework.core.task.AsyncTaskExecutor
public <T> java.util.concurrent.Future<T> submit(java.util.concurrent.Callable<T> task)
submit
in interface org.springframework.core.task.AsyncTaskExecutor
public boolean prefersShortLivedTasks()
prefersShortLivedTasks
in interface SchedulingTaskExecutor
true
if this TaskExecutor
prefers
short-lived tasks