public class ScheduledThreadPoolExecutorProvider extends AbstractThreadPoolProvider<ScheduledThreadPoolExecutor> implements ScheduledExecutorServiceProvider
scheduled executor service provider SPI.
This provider creates and provisions a shared ScheduledThreadPoolExecutor instance
using the customizable core threads, backing thread factory
and rejected task handler values. Subclasses may override the respective methods
to customize the parameters of the provisioned scheduler.
When Jersey runtime no longer requires the use of a provided executor service instance, it invokes the provider's
dispose(java.util.concurrent.ExecutorService) method to signal the provider that the executor service instance can be disposed of. In this method,
provider is free to implement the proper shut-down logic for the disposed executor service instance and perform other
necessary cleanup. Yet, some providers may wish to implement a shared executor service strategy. In such case,
it may not be desirable to shut down the released executor service in the dispose(java.util.concurrent.ExecutorService) method. Instead, to perform the
eventual shut-down procedure, the provider may either rely on an explicit invocation of it's specific clean-up method.
Since all Jersey providers operate in a container environment, a good clean-up strategy for a shared executor
service provider implementation is to expose a @PreDestroy-annotated method
that will be invoked for all instances managed by the container, before the container shuts down.
IMPORTANT: Please note that any pre-destroy methods may not be invoked for instances created outside of the container and later registered within the container. Pre-destroy methods are only guaranteed to be invoked for those instances that are created and managed by the container.
DEFAULT_TERMINATION_TIMEOUT| Constructor and Description |
|---|
ScheduledThreadPoolExecutorProvider(String name)
Create a new instance of the scheduled thread pool executor provider.
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| Modifier and Type | Method and Description |
|---|---|
protected ScheduledThreadPoolExecutor |
createExecutor(int corePoolSize,
ThreadFactory threadFactory,
RejectedExecutionHandler handler)
Create a new instance of the thread pool executor that should be provided by the
AbstractThreadPoolProvider.getExecutor() method. |
void |
dispose(ExecutorService executorService)
Invoked when Jersey runtime no longer requires use of the provided executor service.
|
ScheduledExecutorService |
getExecutorService()
Get a scheduled executor service to be used by Jersey client or server runtime to schedule execution of
specific tasks.
|
void |
preDestroy()
Container pre-destroy handler method.
|
close, getBackingThreadFactory, getCorePoolSize, getExecutor, getRejectedExecutionHandler, getTerminationTimeout, isClosed, onClosepublic ScheduledThreadPoolExecutorProvider(String name)
name - provider name. The name will be used to name the threads created & used by the
provisioned scheduled thread pool executor.public ScheduledExecutorService getExecutorService()
ScheduledExecutorServiceProvider
This method is usually invoked just once at either Jersey client or server application runtime initialization,
it may however be invoked multiple times. Once the instance of the provided scheduled executor service is not
needed anymore by Jersey application runtime, it will be disposed.
This typically happens in one of the following situations:
getExecutorService in interface ExecutorServiceProvidergetExecutorService in interface ScheduledExecutorServiceProvidernull.protected ScheduledThreadPoolExecutor createExecutor(int corePoolSize, ThreadFactory threadFactory, RejectedExecutionHandler handler)
AbstractThreadPoolProviderAbstractThreadPoolProvider.getExecutor() method.
Concrete implementations of this class must override this method and implement the logic that creates the executor
service to be provided. The returned thread pool executor will be shut down when this provider instance is
closed.
This method is invoked at most once, during the first call to the getExecutor() method.
createExecutor in class AbstractThreadPoolProvider<ScheduledThreadPoolExecutor>corePoolSize - number of core threads the provisioned thread pool executor should provide.threadFactory - thread factory to be used by the provisioned thread pool executor when creating new threads.handler - handler for tasks that cannot be executed by the provisioned thread pool executor (e.g. due to a
shutdown).AbstractThreadPoolProvider.getExecutor(),
AbstractThreadPoolProvider.close(),
AbstractThreadPoolProvider.getCorePoolSize(),
AbstractThreadPoolProvider.getBackingThreadFactory(),
AbstractThreadPoolProvider.getRejectedExecutionHandler()public void dispose(ExecutorService executorService)
ExecutorServiceProviderdispose in interface ExecutorServiceProviderexecutorService - executor service to be disposed.@PreDestroy public void preDestroy()
Invoking the method closes this provider.
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