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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.util.concurrent.AbstractExecutorService | +--com.bea.wlevs.ede.impl.ScopedExecutor
Work copied from Doug Lea's ThreadPoolExecutor
Inner Class Summary | |
static class |
ScopedExecutor.AbortPolicy
A handler for rejected tasks that throws a RejectedExecutionException. |
static class |
ScopedExecutor.CallerRunsPolicy
A handler for rejected tasks that runs the rejected task directly in the calling thread of the execute method, unless the executor has been shut down, in which case the task is discarded. |
static class |
ScopedExecutor.DiscardOldestPolicy
A handler for rejected tasks that discards the oldest unhandled request and then retries execute, unless the executor is shut down, in which case the task is discarded. |
static class |
ScopedExecutor.DiscardPolicy
A handler for rejected tasks that silently discards the rejected task. |
Constructor Summary | |
ScopedExecutor(int corePoolSize,
int maximumPoolSize,
long keepAliveTime,
TimeUnit unit,
BlockingQueue workQueue,
WorkFactory workFactory,
WorkManager workManager,
RejectedExecutionHandler handler)
|
Method Summary | |
protected void |
afterExecute(Runnable r,
Throwable t)
Method invoked upon completion of execution of the given Runnable. |
boolean |
awaitTermination(long timeout,
TimeUnit unit)
|
protected void |
beforeExecute(Work w,
Runnable r)
Method invoked prior to executing the given Runnable in the given thread. |
void |
execute(Runnable command)
Executes the given task sometime in the future. |
protected void |
finalize()
Invokes shutdown when this executor is no longer referenced. |
int |
getActiveCount()
Returns the approximate number of threads that are actively executing tasks. |
long |
getCompletedTaskCount()
Returns the approximate total number of tasks that have completed execution. |
int |
getCorePoolSize()
Returns the core number of threads. |
long |
getKeepAliveTime(TimeUnit unit)
Returns the thread keep-alive time, which is the amount of time which threads in excess of the core pool size may remain idle before being terminated. |
int |
getLargestPoolSize()
Returns the largest number of threads that have ever simultaneously been in the pool. |
int |
getMaximumPoolSize()
Returns the maximum allowed number of threads. |
int |
getPoolSize()
Returns the current number of threads in the pool. |
BlockingQueue |
getQueue()
Returns the task queue used by this executor. |
RejectedExecutionHandler |
getRejectedExecutionHandler()
Returns the current handler for unexecutable tasks. |
long |
getTaskCount()
Returns the approximate total number of tasks that have been scheduled for execution. |
WorkFactory |
getWorkFactory()
Returns the thread factory used to create new threads. |
boolean |
isShutdown()
|
boolean |
isTerminated()
|
boolean |
isTerminating()
Returns true if this executor is in the process of terminating after shutdown or shutdownNow but has not completely terminated. |
int |
prestartAllCoreThreads()
Starts all core threads, causing them to idly wait for work. |
boolean |
prestartCoreThread()
Starts a core thread, causing it to idly wait for work. |
void |
purge()
Tries to remove from the work queue all Future
tasks that have been cancelled. |
boolean |
remove(Runnable task)
Removes this task from the executor's internal queue if it is present, thus causing it not to be run if it has not already started. |
void |
setCorePoolSize(int corePoolSize)
Sets the core number of threads. |
void |
setKeepAliveTime(long time,
TimeUnit unit)
Sets the time limit for which threads may remain idle before being terminated. |
void |
setMaximumPoolSize(int maximumPoolSize)
Sets the maximum allowed number of threads. |
void |
setRejectedExecutionHandler(RejectedExecutionHandler handler)
Sets a new handler for unexecutable tasks. |
void |
setWorkFactory(WorkFactory workFactory)
Sets the thread factory used to create new threads. |
void |
setWorkManager(WorkManager workManager)
|
void |
shutdown()
Initiates an orderly shutdown in which previously submitted tasks are executed, but no new tasks will be accepted. |
List |
shutdownNow()
Attempts to stop all actively executing tasks, halts the processing of waiting tasks, and returns a list of the tasks that were awaiting execution. |
protected void |
terminated()
Method invoked when the Executor has terminated. |
Methods inherited from class java.util.concurrent.AbstractExecutorService |
invokeAll,
invokeAll,
invokeAny,
invokeAny,
submit,
submit,
submit |
Methods inherited from class java.lang.Object |
clone,
equals,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Constructor Detail |
public ScopedExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue workQueue, WorkFactory workFactory, WorkManager workManager, RejectedExecutionHandler handler)
Method Detail |
public void execute(Runnable command)
command
- the task to executepublic void shutdown()
RuntimePermission
("modifyThread"),
or the security manager's checkAccess method denies access.public List shutdownNow()
This implementation cancels tasks via Thread.interrupt()
, so if any tasks mask or fail to respond to
interrupts, they may never terminate.
RuntimePermission
("modifyThread"),
or the security manager's checkAccess method denies access.public boolean isShutdown()
public boolean isTerminating()
public boolean isTerminated()
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException
protected void finalize()
public void setWorkFactory(WorkFactory workFactory)
workFactory
- the new thread factorygetWorkFactory()
public void setWorkManager(WorkManager workManager)
public WorkFactory getWorkFactory()
setWorkFactory(com.bea.wlevs.ede.WorkFactory)
public void setRejectedExecutionHandler(RejectedExecutionHandler handler)
handler
- the new handlergetRejectedExecutionHandler()
public RejectedExecutionHandler getRejectedExecutionHandler()
setRejectedExecutionHandler(com.bea.wlevs.ede.RejectedExecutionHandler)
public BlockingQueue getQueue()
public boolean remove(Runnable task)
This method may be useful as one part of a cancellation
scheme. It may fail to remove tasks that have been converted
into other forms before being placed on the internal queue. For
example, a task entered using submit might be
converted into a form that maintains Future status.
However, in such cases, method purge()
may be used to remove those Futures that have been cancelled.
task
- the task to removepublic void purge()
Future
tasks that have been cancelled. This method can be useful as a
storage reclamation operation, that has no other impact on
functionality. Cancelled tasks are never executed, but may
accumulate in work queues until worker threads can actively
remove them. Invoking this method instead tries to remove them now.
However, this method may fail to remove tasks in
the presence of interference by other threads.
public void setCorePoolSize(int corePoolSize)
corePoolSize
- the new core sizegetCorePoolSize()
public int getCorePoolSize()
setCorePoolSize(int)
public boolean prestartCoreThread()
public int prestartAllCoreThreads()
public void setMaximumPoolSize(int maximumPoolSize)
maximumPoolSize
- the new maximumgetMaximumPoolSize()
public int getMaximumPoolSize()
setMaximumPoolSize(int)
public void setKeepAliveTime(long time, TimeUnit unit)
time
- the time to wait. A time value of zero will cause
excess threads to terminate immediately after executing tasks.unit
- the time unit of the time argumentgetKeepAliveTime(java.util.concurrent.TimeUnit)
public long getKeepAliveTime(TimeUnit unit)
unit
- the desired time unit of the resultsetKeepAliveTime(long, java.util.concurrent.TimeUnit)
public int getPoolSize()
public int getActiveCount()
public int getLargestPoolSize()
public long getTaskCount()
public long getCompletedTaskCount()
protected void beforeExecute(Work w, Runnable r)
t
- the thread that will run task r.r
- the task that will be executed.protected void afterExecute(Runnable r, Throwable t)
r
- the runnable that has completed.t
- the exception that caused termination, or null if
execution completed normally.protected void terminated()
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