org.jcsp.lang
Class AltingChannelOutput

java.lang.Object
  org.jcsp.lang.Guard
      org.jcsp.lang.AltingChannelOutput

All Implemented Interfaces:

ChannelOutput, Poisonable

public abstract class AltingChannelOutput
extends Guard
implements ChannelOutput

This extends Guard and ChannelOutput to enable a process to choose between many integer output (and other) events.

A writing-end, obtained only from a symmetric channel by invoking its out() method, will implement this interface.

Description

AltingChannelOutput extends Guard and ChannelOutput to enable a process to choose between many integer output (and other) events. The methods inherited from Guard are of no concern to users of this package.

Example

 import org.jcsp.lang.*;
 
 public class AltingOutputExample implements CSProcess {
 
   private final AltingChannelOutput out0, out1;
   
   public AltingOutputExample (final AltingChannelOutput out0,
                               final AltingChannelOutput out1) {
     this.out0 = out0;
     this.out1 = out1;
   }
 
   public void run () {
 
     final Guard[] altChans = {out0, out1};
     final Alternative alt = new Alternative (altChans);
 
     while (true) {
       switch (alt.select ()) {
         case 0:
           out0.write (new Integer (0));
           System.out.println ("out0 written");
         break;
         case 1:
           out1.write (new Integer (1));
           System.out.println ("out1 written");
         break;
       }
     }
 
   }
 
 }
 

Author:

P.H. Welch

See Also:

Guard, Alternative, One2OneChannelSymmetric, AltingChannelOutputInt

Constructor Summary

AltingChannelOutput()

Method Summary

abstract boolean

pending() Returns whether the receiver is committed to read from this channel.

Methods inherited from class org.jcsp.lang.Guard

schedule

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jcsp.lang.ChannelOutput

write

Methods inherited from interface org.jcsp.lang.Poisonable

poison

Constructor Detail

AltingChannelOutput

public AltingChannelOutput()

Method Detail

pending

public abstract boolean pending()

Returns whether the receiver is committed to read from this channel.

Note: if this returns true, you must commit to write down this channel.

Returns:

state of the channel.