Package 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:

  • Constructor Details

    • BlackHoleChannel

      public BlackHoleChannel()

  • Method Details

    • 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).