Package org.elasticsearch.threadpool

Interface Scheduler

All Known Implementing Classes:

ThreadPool

public interface Scheduler

Scheduler that allows to schedule one-shot and periodic commands.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	Scheduler.Cancellable	This interface represents an object whose execution may be cancelled during runtime.
static class	Scheduler.ReschedulingRunnable	This class encapsulates the scheduling of a Runnable that needs to be repeated on a interval.

Method Summary

Modifier and Type	Method	Description
static boolean	awaitTermination(java.util.concurrent.ScheduledThreadPoolExecutor scheduledThreadPoolExecutor, long timeout, java.util.concurrent.TimeUnit timeUnit)
static java.util.concurrent.ScheduledThreadPoolExecutor	initScheduler(Settings settings)
default java.lang.Runnable	preserveContext(java.lang.Runnable command)	Does nothing by default but can be used by subclasses to save the current thread context and wraps the command in a Runnable that restores that context before running the command.
java.util.concurrent.ScheduledFuture<?>	schedule(TimeValue delay, java.lang.String executor, java.lang.Runnable command)	Schedules a one-shot command to be run after a given delay.
default Scheduler.Cancellable	scheduleWithFixedDelay(java.lang.Runnable command, TimeValue interval, java.lang.String executor)	Schedules a periodic action that runs on scheduler thread.
static boolean	terminate(java.util.concurrent.ScheduledThreadPoolExecutor scheduledThreadPoolExecutor, long timeout, java.util.concurrent.TimeUnit timeUnit)

Method Detail

initScheduler

static java.util.concurrent.ScheduledThreadPoolExecutor initScheduler(Settings settings)

terminate

static boolean terminate(java.util.concurrent.ScheduledThreadPoolExecutor scheduledThreadPoolExecutor,
                         long timeout,
                         java.util.concurrent.TimeUnit timeUnit)

awaitTermination

static boolean awaitTermination(java.util.concurrent.ScheduledThreadPoolExecutor scheduledThreadPoolExecutor,
                                long timeout,
                                java.util.concurrent.TimeUnit timeUnit)

preserveContext

default java.lang.Runnable preserveContext(java.lang.Runnable command)

Does nothing by default but can be used by subclasses to save the current thread context and wraps the command in a Runnable that restores that context before running the command.

schedule

java.util.concurrent.ScheduledFuture<?> schedule(TimeValue delay,
                                                 java.lang.String executor,
                                                 java.lang.Runnable command)

Schedules a one-shot command to be run after a given delay. The command is not run in the context of the calling thread. To preserve the context of the calling thread you may call preserveContext(Runnable) on the runnable before passing it to this method. The command runs on scheduler thread. Do not run blocking calls on the scheduler thread. Subclasses may allow to execute on a different executor, in which case blocking calls are allowed.

Parameters:

delay - delay before the task executes

executor - the name of the executor that has to execute this task. Ignored in the default implementation but can be used by subclasses that support multiple executors.

command - the command to run

Returns:

a ScheduledFuture who's get will return when the task has been added to its target thread pool and throws an exception if the task is canceled before it was added to its target thread pool. Once the task has been added to its target thread pool the ScheduledFuture cannot interact with it.

Throws:

EsRejectedExecutionException - if the task cannot be scheduled for execution

scheduleWithFixedDelay

default Scheduler.Cancellable scheduleWithFixedDelay(java.lang.Runnable command,
                                                     TimeValue interval,
                                                     java.lang.String executor)

Schedules a periodic action that runs on scheduler thread. Do not run blocking calls on the scheduler thread. Subclasses may allow to execute on a different executor, in which case blocking calls are allowed.

Parameters:

command - the action to take

interval - the delay interval

executor - the name of the executor that has to execute this task. Ignored in the default implementation but can be used by subclasses that support multiple executors.

Returns:

a Scheduler.Cancellable that can be used to cancel the subsequent runs of the command. If the command is running, it will not be interrupted.