CSP for Java
(JCSP) 1.1-rc4

Class Plex

  extended by org.jcsp.plugNplay.Plex
All Implemented Interfaces:

public final class Plex
extends Object
implements CSProcess

Fair multiplexes its input Object stream array into one output stream.

Process Diagram


Plex is a process whose output stream is a fair multiplexing of its input streams. It makes no assumptions about the traffic patterns occuring on the input streams and ensures that no input stream will be starved by busy siblings. It guarantees that if an input stream has data pending, no other stream will be serviced twice before that data is serviced.

Channel Protocols

Input Channels
in[] java.lang.Object The input streams.
Output Channels
out java.lang.Object The multiplexed output stream.


The following example shows how to use Plex in a small program.
 import org.jcsp.lang.*;
 import org.jcsp.plugNplay.*;
 public class PlexExample {
   public static void main (String[] argv) {
     final One2OneChannel[] a = Channel.one2oneArray (3);
     final One2OneChannel[] b = Channel.one2oneArray (3);
     final One2OneChannel c = Channel.one2one ();
     new Parallel (
       new CSProcess[] {
         new Numbers (a[0].out ()),
         new Fibonacci (a[1].out ()),
         new Squares (a[2].out ()),
         new Sign ("Numbers ", a[0].in (), b[0].out ()),
         new Sign ("            Fibonacci ", a[1].in (), b[1].out ()),
         new Sign ("                          Squares ", a[2].in (), b[2].out ()),
         new Plex (Channel.getInputArray (b), c.out ()),
         new Printer (c.in (), "", "\n")
     ).run ();

Implemntation Note

For information, here is the run method for this process:
   public void run () {
     Alternative alt = new Alternative (in);       // in is the input channel array
     while (true) {
       out.write (in[alt.fairSelect ()].read ());  // out is the output channel

P.H. Welch
See Also:
Plex2, Multiplex

Constructor Summary
Plex(AltingChannelInput[] in, ChannelOutput out)
          Construct a new Plex process with input channels in and output channel out.
Method Summary
 void run()
          The main body of this process.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public Plex(AltingChannelInput[] in,
            ChannelOutput out)
Construct a new Plex process with input channels in and output channel out. The ordering of the input channels makes no difference to the behaviour of this process.

in - the input channels
out - the output channel
Method Detail


public void run()
The main body of this process.

Specified by:
run in interface CSProcess

CSP for Java
(JCSP) 1.1-rc4

Submit a bug or feature to jcsp-team@kent.ac.uk
Version 1.1-rc4 of the JCSP API Specification (Copyright 1997-2008 P.D.Austin and P.H.Welch - All Rights Reserved)
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