groovyx.gpars.dataflow.operator

Class CountingPoisonPill

java.lang.Object

groovyx.gpars.dataflow.operator.PoisonPill

groovyx.gpars.dataflow.operator.CountingPoisonPill

All Implemented Interfaces:

ControlMessage

public final class CountingPoisonPill
extends PoisonPill

Represents a non-immediate PoisonPill that counts stopped operators and can be used to wait for all the operators to terminate.

Author:

Vaclav Pech

Field Summary

Fields

Modifier and Type	Field and Description
private PoisonTrackCounter	poisonTrackCounter

Constructor Summary

Constructors

Constructor and Description
CountingPoisonPill(int count) Creates a non-immediate instance that could be used to stop operators in a network.

Method Summary

Methods

Modifier and Type	Method and Description
(package private) void	countDown()
Promise<java.lang.Boolean>	getTermination() Retrieves the promise for termination
void	join() Blocks until the number of terminated operators reaches the number specified in the constructor
void	join(long timeout, java.util.concurrent.TimeUnit unit) Blocks until the number of terminated operators reaches the number specified in the constructor

Methods inherited from class groovyx.gpars.dataflow.operator.PoisonPill

getImmediateInstance, getInstance, isImmediate

Methods inherited from class java.lang.Object

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

Field Detail

poisonTrackCounter

private final PoisonTrackCounter poisonTrackCounter

Constructor Detail

CountingPoisonPill

public CountingPoisonPill(int count)

Creates a non-immediate instance that could be used to stop operators in a network.

Parameters:

count - The number of operators that need to be stopped before the join() method returns.

Method Detail

join

public void join()
          throws java.lang.InterruptedException

Blocks until the number of terminated operators reaches the number specified in the constructor

Throws:

java.lang.InterruptedException - If the current thread gets interrupted during the blocking

join

public void join(long timeout,
        java.util.concurrent.TimeUnit unit)
          throws java.lang.InterruptedException

Blocks until the number of terminated operators reaches the number specified in the constructor

Parameters:

timeout - the maximum time to wait

unit - the time unit of the timeout argument

Throws:

java.lang.InterruptedException - If the current thread gets interrupted during the blocking

getTermination

public Promise<java.lang.Boolean> getTermination()

Retrieves the promise for termination

Returns:

A Promise instance that will be bound when all the requested dataflow processors have been terminated

countDown

void countDown()

Overrides:

countDown in class PoisonPill