org.jcsp.lang
Class BlackHoleChannelInt

java.lang.Object
  org.jcsp.lang.BlackHoleChannelInt

All Implemented Interfaces:

ChannelOutputInt, Poisonable

public class BlackHoleChannelInt
extends Object
implements ChannelOutputInt

This implements ChannelOutputInt with black hole semantics.

Description

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

Note: BlackHoleChannelInts 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:

ChannelOutputInt, One2OneChannelInt, Any2OneChannelInt, One2AnyChannelInt, Any2AnyChannelInt

Constructor Summary

BlackHoleChannelInt()

Method Summary

void	poison(int strength) This injects poison into the channel.
void	write(int n) Write an integer to the channel and loose it.

Methods inherited from class java.lang.Object

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

Constructor Detail

BlackHoleChannelInt

public BlackHoleChannelInt()

Method Detail

write

public void write(int n)

Write an integer to the channel and loose it.

Specified by:

write in interface ChannelOutputInt

Parameters:

n - the integer 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).