io.nadron.concurrent

Class DataFlowVariable

java.lang.Object

io.nadron.concurrent.DataFlowVariable

public class DataFlowVariable
extends Object

An anemic implementation of Gpars GPars dataflow variable. This class will block the getVal call using a simple count down latch, also it does not really prevent resetting the value using bind.

Author:

Abraham Menacherry

Field Summary

Fields

Modifier and Type	Field and Description
(package private) CountDownLatch	latch
(package private) Object	val

Constructor Summary

Constructors

Constructor and Description
DataFlowVariable()
DataFlowVariable(CountDownLatch latch)

Method Summary

Methods

Modifier and Type	Method and Description
void	bind(Object val) The method will bind the incoming value to the value in the class and then do a countDown on the latch.
Object	getVal() This method blocks till the count down latch has reset to 0.
Object	getVal(long waitTime, TimeUnit timeUnit) This method blocks for a specified amount of time to retrieve the value bound in bind method.

Methods inherited from class java.lang.Object

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

Field Detail

latch

final CountDownLatch latch

val

Object val

Constructor Detail

DataFlowVariable

public DataFlowVariable()

DataFlowVariable

public DataFlowVariable(CountDownLatch latch)

Method Detail

bind

public void bind(Object val)

The method will bind the incoming value to the value in the class and then do a countDown on the latch.

Parameters:

val -

getVal

public Object getVal()
              throws InterruptedException

This method blocks till the count down latch has reset to 0.

Returns:

Returns the value set by the bind method

Throws:

InterruptedException

getVal

public Object getVal(long waitTime,
            TimeUnit timeUnit)
              throws InterruptedException

This method blocks for a specified amount of time to retrieve the value bound in bind method.

Parameters:

waitTime - the amount of time to wait

timeUnit - the unit, milliseconds, seconds etc.

Returns:

Returns the bound value or null if the time out has exceeded.

Throws:

InterruptedException