org.apache.reef.wake.impl

Class ThreadPoolStage<T>

java.lang.Object

org.apache.reef.wake.AbstractEStage<T>

org.apache.reef.wake.impl.ThreadPoolStage<T>

Type Parameters:

T - type

All Implemented Interfaces:

AutoCloseable, EStage<T>, EventHandler<T>, Stage

public final class ThreadPoolStage<T>
extends AbstractEStage<T>

Stage that executes an event handler with a thread pool.

Constructor Summary

Constructors

Constructor and Description
ThreadPoolStage(EventHandler<T> handler, ExecutorService executor) Constructs a thread-pool stage.
ThreadPoolStage(EventHandler<T> handler, ExecutorService executor, EventHandler<Throwable> errorHandler) Constructs a thread-pool stage.
ThreadPoolStage(EventHandler<T> handler, int numThreads) Constructs a thread-pool stage.
ThreadPoolStage(String name, EventHandler<T> handler, ExecutorService executor) Constructs a thread-pool stage.
ThreadPoolStage(String name, EventHandler<T> handler, ExecutorService executor, EventHandler<Throwable> errorHandler) Constructs a thread-pool stage.
ThreadPoolStage(String name, EventHandler<T> handler, int numThreads) Constructs a thread-pool stage.
ThreadPoolStage(String name, EventHandler<T> handler, int numThreads, EventHandler<Throwable> errorHandler) Constructs a thread-pool stage.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closes resources.
int	getQueueLength() Gets the queue length of this stage.
void	onNext(T value) Handles the event using a thread in the thread pool.

Methods inherited from class org.apache.reef.wake.AbstractEStage

getInMeter, getOutMeter

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreadPoolStage

@Inject
public ThreadPoolStage(EventHandler<T> handler,
                      int numThreads)

Constructs a thread-pool stage.

Parameters:

handler - the event handler to execute

numThreads - the number of threads to use

Throws:

WakeRuntimeException

ThreadPoolStage

@Inject
public ThreadPoolStage(String name,
                      EventHandler<T> handler,
                      int numThreads,
                      EventHandler<Throwable> errorHandler)

Constructs a thread-pool stage.

Parameters:

name - the stage name

handler - the event handler to execute

numThreads - the number of threads to use

errorHandler - the error handler

Throws:

WakeRuntimeException

ThreadPoolStage

@Inject
public ThreadPoolStage(String name,
                      EventHandler<T> handler,
                      int numThreads)

Constructs a thread-pool stage.

Parameters:

name - the stage name

handler - the event handler to execute

numThreads - the number of threads to use

Throws:

WakeRuntimeException

ThreadPoolStage

@Inject
public ThreadPoolStage(EventHandler<T> handler,
                      ExecutorService executor)

Constructs a thread-pool stage.

Parameters:

handler - the event handler to execute

executor - the external executor service provided

ThreadPoolStage

@Inject
public ThreadPoolStage(EventHandler<T> handler,
                      ExecutorService executor,
                      EventHandler<Throwable> errorHandler)

Constructs a thread-pool stage.

Parameters:

handler - the event handler to execute

executor - the external executor service provided

errorHandler - the error handler

ThreadPoolStage

@Inject
public ThreadPoolStage(String name,
                      EventHandler<T> handler,
                      ExecutorService executor)

Constructs a thread-pool stage.

Parameters:

name - the stage name

handler - the event handler to execute

executor - the external executor service provided for consistent tracking, it is recommended to create executor with DefaultThreadFactory

ThreadPoolStage

@Inject
public ThreadPoolStage(String name,
                      EventHandler<T> handler,
                      ExecutorService executor,
                      EventHandler<Throwable> errorHandler)

Constructs a thread-pool stage.

Parameters:

name - the stage name

handler - the event handler to execute

executor - the external executor service provided for consistent tracking, it is recommended to create executor with DefaultThreadFactory

errorHandler - the error handler

Method Detail

onNext

public void onNext(T value)

Handles the event using a thread in the thread pool.

Parameters:

value - the event

close

public void close()
           throws Exception

Closes resources.

Throws:

Exception

getQueueLength

public int getQueueLength()

Gets the queue length of this stage.

Returns:

the queue length