DataflowSelector (org.codehaus.gpars)

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groovyx.gpars.dataflow.operator
[Groovy] Class DataflowSelector

java.lang.Object
  groovyx.gpars.dataflow.operator.DataflowProcessor
      groovyx.gpars.dataflow.operator.DataflowSelector

class DataflowSelector
extends DataflowProcessor

Dataflow selectors and operators (processors) form the basic units in dataflow networks. They are typically combined into oriented graphs that transform data. They accept a set of input and output dataflow channels so that once values are available to be consumed in any of the input channels the selector's body is triggered on the values, potentially generating values to be written into the output channels. The output channels at the same time are suitable to be used as input channels by some other dataflow processors. The channels allow processors to communicate. Dataflow selectors and operators enable creation of highly concurrent applications yet the abstraction hides the low-level concurrency primitives and exposes much friendlier API. Since selectors and operators internally leverage the actor implementation, they reuse a pool of threads and so the actual number of threads used by the calculation can be kept much lower than the actual number of processors used in the network. Selectors select a random value from the values available in the input channels. Optionally the selector's guards mask can be altered to limit the number of channels considered for selection.

Authors:: Vaclav Pech Date: Sep 9, 2009

Field Summary
`protected java.util.List`	`guards`
`protected Select`	`select`

Fields inherited from class DataflowProcessor
actor

Constructor Summary
`protected DataflowSelector(PGroup group, java.util.Map channels, groovy.lang.Closure code)` Creates a selector After creation the selector needs to be started using the start() method.

Method Summary
`protected void`	`doSelect()` Ask for another select operation on the internal select instance.
`protected void`	`reportError(java.lang.Throwable e)` Is invoked in case the actor throws an exception.
`void`	`setGuard(int index, boolean flag)` Used to enable/disable individual input channels from next selections
`void`	`setGuards(java.util.List flags)` Used to enable/disable individual input channels from next selections
`private boolean`	`verifyChannelParameters(java.util.Map channels, int parameters)`

Methods inherited from class DataflowProcessor
bindAllOutputValues, bindAllOutputValuesAtomically, bindAllOutputs, bindAllOutputsAtomically, bindOutput, bindOutput, getOutput, getOutputs, getOutputs, join, reportError, shouldBeMultiThreaded, start, start, stop

Methods inherited from class java.lang.Object
java.lang.Object#wait(long), java.lang.Object#wait(), java.lang.Object#wait(long, int), java.lang.Object#equals(java.lang.Object), java.lang.Object#toString(), java.lang.Object#hashCode(), java.lang.Object#getClass(), java.lang.Object#notify(), java.lang.Object#notifyAll()

Field Detail

guards

protected final java.util.List guards

select

protected final Select select

Constructor Detail