Package org.apache.cassandra.concurrent

Class ImmediateExecutor

java.lang.Object

org.apache.cassandra.concurrent.ImmediateExecutor

All Implemented Interfaces:

java.util.concurrent.Executor, java.util.concurrent.ExecutorService, ExecutorPlus, LocalAwareExecutorPlus, ResizableThreadPool

public class ImmediateExecutor
extends java.lang.Object
implements LocalAwareExecutorPlus

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.concurrent.ExecutorPlus

ExecutorPlus.MaximumPoolSizeListener

Field Summary

Fields

Modifier and Type	Field	Description
static ImmediateExecutor	INSTANCE

Method Summary

Modifier and Type	Method	Description
boolean	awaitTermination(long timeout, java.util.concurrent.TimeUnit unit)
void	execute(java.lang.Runnable task)
void	execute(WithResources withResources, java.lang.Runnable task)	Invoke task.
int	getActiveTaskCount()	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 core pool size of thread pool, the minimum number of workers (where that makes sense for a thread pool, SEPExecutor does not have a minimum size).
int	getMaximumPoolSize()	Returns maximum pool size of thread pool.
int	getPendingTaskCount()	Returns the approximate total of tasks waiting to be executed.
boolean	inExecutor()
boolean	isShutdown()
boolean	isTerminated()
void	setCorePoolSize(int newCorePoolSize)	Allows user to resize minimum size of the thread pool.
void	setMaximumPoolSize(int newMaximumPoolSize)	Allows user to resize maximum size of the thread pool.
void	shutdown()
java.util.List<java.lang.Runnable>	shutdownNow()
Future<?>	submit(java.lang.Runnable task)	Overrides ExecutorService.submit(Runnable) to return a Cassandra Future
<T> Future<T>	submit(java.lang.Runnable task, T result)	Overrides ExecutorService.submit(Runnable, Object) to return a Cassandra Future
<T> Future<T>	submit(java.util.concurrent.Callable<T> task)	Overrides ExecutorService.submit(Callable) to return a Cassandra Future
Future<?>	submit(WithResources withResources, java.lang.Runnable task)	Invoke task, returning a future yielding null if successful, or the abnormal termination of task otherwise.
<T> Future<T>	submit(WithResources withResources, java.lang.Runnable task, T result)	Invoke task, returning a future yielding result if successful, or the abnormal termination of task otherwise.
<T> Future<T>	submit(WithResources withResources, java.util.concurrent.Callable<T> task)	Invoke task, returning a future representing this computation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.cassandra.concurrent.ExecutorPlus

invokeAll, invokeAll, invokeAny, invokeAny, maybeExecuteImmediately

Methods inherited from interface org.apache.cassandra.concurrent.ResizableThreadPool

getMaxTasksQueued, oldestTaskQueueTime

Field Detail

INSTANCE

public static final ImmediateExecutor INSTANCE

Method Detail

submit

public <T> Future<T> submit(java.util.concurrent.Callable<T> task)

Description copied from interface: ExecutorPlus

Overrides ExecutorService.submit(Callable) to return a Cassandra Future

Specified by:

submit in interface ExecutorPlus

Specified by:

submit in interface java.util.concurrent.ExecutorService

submit

public <T> Future<T> submit(java.lang.Runnable task,
                            T result)

Description copied from interface: ExecutorPlus

Overrides ExecutorService.submit(Runnable, Object) to return a Cassandra Future

Specified by:

submit in interface ExecutorPlus

Specified by:

submit in interface java.util.concurrent.ExecutorService

submit

public Future<?> submit(java.lang.Runnable task)

Description copied from interface: ExecutorPlus

Overrides ExecutorService.submit(Runnable) to return a Cassandra Future

Specified by:

submit in interface ExecutorPlus

Specified by:

submit in interface java.util.concurrent.ExecutorService

execute

public void execute(WithResources withResources,
                    java.lang.Runnable task)

Description copied from interface: ExecutorPlus

Invoke task. The invoking thread will first instantiate the resources provided before invoking task, so that thread state may be modified and cleaned up. The invoking thread will execute something semantically equivlent to: try (Closeable close = withResources.get()) { task.run(); }

Specified by:

execute in interface ExecutorPlus

Parameters:

withResources - the resources to create and hold while executing task

task - the task to execute

submit

public <T> Future<T> submit(WithResources withResources,
                            java.util.concurrent.Callable<T> task)

Description copied from interface: ExecutorPlus

Invoke task, returning a future representing this computation. The invoking thread will first instantiate the resources provided before invoking task, so that thread state may be modified and cleaned up. The invoking thread will execute something semantically equivlent to: try (Closeable close = withResources.get()) { return task.call(); }

Specified by:

submit in interface ExecutorPlus

Parameters:

withResources - the resources to create and hold while executing task

task - the task to execute

submit

public Future<?> submit(WithResources withResources,
                        java.lang.Runnable task)

Description copied from interface: ExecutorPlus

Invoke task, returning a future yielding null if successful, or the abnormal termination of task otherwise. The invoking thread will first instantiate the resources provided before invoking task, so that thread state may be modified and cleaned up try (Closeable close = withResources.get()) { task.run(); return null; }

Specified by:

submit in interface ExecutorPlus

Parameters:

withResources - the resources to create and hold while executing task

task - the task to execute

submit

public <T> Future<T> submit(WithResources withResources,
                            java.lang.Runnable task,
                            T result)

Description copied from interface: ExecutorPlus

Invoke task, returning a future yielding result if successful, or the abnormal termination of task otherwise. The invoking thread will first instantiate the resources provided before invoking task, so that thread state may be modified and cleaned up. The invoking thread will execute something semantically equivlent to: try (Closeable close = withResources.get()) { task.run(); return result; }

Specified by:

submit in interface ExecutorPlus

Parameters:

withResources - the resources to create and hold while executing task

task - the task to execute

result - the result if successful

inExecutor

public boolean inExecutor()

Specified by:

inExecutor in interface ExecutorPlus

Returns:

true iff the caller is a worker thread actively serving this executor

execute

public void execute(java.lang.Runnable task)

Specified by:

execute in interface java.util.concurrent.Executor

getActiveTaskCount

public int getActiveTaskCount()

Description copied from interface: ResizableThreadPool

Returns the approximate number of threads that are actively executing tasks.

Specified by:

getActiveTaskCount in interface ResizableThreadPool

Returns:

the number of threads

getCompletedTaskCount

public long getCompletedTaskCount()

Description copied from interface: ResizableThreadPool

Returns the approximate total number of tasks that have completed execution. Because the states of tasks and threads may change dynamically during computation, the returned value is only an approximation, but one that does not ever decrease across successive calls.

Specified by:

getCompletedTaskCount in interface ResizableThreadPool

Returns:

the number of tasks

getPendingTaskCount

public int getPendingTaskCount()

Description copied from interface: ResizableThreadPool

Returns the approximate total of tasks waiting to be executed. Because the states of tasks and threads may change dynamically during computation, the returned value is only an approximation.

Specified by:

getPendingTaskCount in interface ResizableThreadPool

Returns:

the number of tasks

getCorePoolSize

public int getCorePoolSize()

Description copied from interface: ResizableThreadPool

Returns core pool size of thread pool, the minimum number of workers (where that makes sense for a thread pool, SEPExecutor does not have a minimum size).

Specified by:

getCorePoolSize in interface ResizableThreadPool

getMaximumPoolSize

public int getMaximumPoolSize()

Description copied from interface: ResizableThreadPool

Returns maximum pool size of thread pool.

Specified by:

getMaximumPoolSize in interface ResizableThreadPool

setCorePoolSize

public void setCorePoolSize(int newCorePoolSize)

Description copied from interface: ResizableThreadPool

Allows user to resize minimum size of the thread pool.

Specified by:

setCorePoolSize in interface ResizableThreadPool

setMaximumPoolSize

public void setMaximumPoolSize(int newMaximumPoolSize)

Description copied from interface: ResizableThreadPool

Allows user to resize maximum size of the thread pool.

Specified by:

setMaximumPoolSize in interface ResizableThreadPool

shutdown

public void shutdown()

Specified by:

shutdown in interface java.util.concurrent.ExecutorService

shutdownNow

public java.util.List<java.lang.Runnable> shutdownNow()

Specified by:

shutdownNow in interface java.util.concurrent.ExecutorService

isShutdown

public boolean isShutdown()

Specified by:

isShutdown in interface java.util.concurrent.ExecutorService

isTerminated

public boolean isTerminated()

Specified by:

isTerminated in interface java.util.concurrent.ExecutorService

awaitTermination

public boolean awaitTermination(long timeout,
                                java.util.concurrent.TimeUnit unit)

Specified by:

awaitTermination in interface java.util.concurrent.ExecutorService