org.jcsp.lang
Class BlackHoleChannel

java.lang.Object
  org.jcsp.lang.BlackHoleChannel

All Implemented Interfaces:

ChannelOutput, Poisonable

public class BlackHoleChannel
extends Object
implements ChannelOutput

This implements ChannelOutput with black hole semantics.

Description

BlackHoleChannel is an implementation of ChannelOutput that yields black hole semantics for the channel. Writers may always write but there can be no readers. Any number of writers may share the same black hole.

Note: BlackHoleChannels are used for masking off unwanted outputs from processes. They are useful when we want to reuse an existing process component intact, but don't need some of its output channels (i.e. we don't want to redesign and reimplement the component to remove the redundant channels). Normal channels cannot be plugged in and left dangling as this may deadlock (parts of) the component being reused.

Author:

P.H. Welch

See Also:

ChannelOutput, One2OneChannel, Any2OneChannel, One2AnyChannel, Any2AnyChannel

Constructor Summary

BlackHoleChannel()

Method Summary

void	poison(int strength) This injects poison into the channel.
void	write(Object object) Write an Object to the channel and lose it.

Methods inherited from class java.lang.Object

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

Constructor Detail

BlackHoleChannel

public BlackHoleChannel()

Method Detail

write

public void write(Object object)

Write an Object to the channel and lose it.

Specified by:

write in interface ChannelOutput

Parameters:

object - the object to write to the channel.

poison

public void poison(int strength)

Description copied from interface: Poisonable

This injects poison into the channel. If the channel was not explicitly constructed to be poisonable or if the strength of poison is not greater than the channel immunity level, the poison will have no effect.

Specified by:

poison in interface Poisonable

Parameters:

strength - the strength of the poison (must be >= 0).