jcsp.plugNplay
Class Plex2
java.lang.Object
|
+--jcsp.plugNplay.Plex2
- All Implemented Interfaces:
- CSProcess
- public final class Plex2
- extends Object
- implements CSProcess
Fair multiplexes two Object streams into one.
Process Diagram
in0 _______
-->--| | out
in1 | Plex2 |-->--
-->--|_______|
Description
Plex2 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 |
in0, in1 |
java.lang.Object |
The input streams.
|
Output Channels |
out |
java.lang.Object |
The multiplexed output stream.
|
Example
The following example shows how to use Plex2 in a small program.
The program also uses some of the other plugNplay processes.
import jcsp.lang.*;
import jcsp.plugNplay.*;
public final class Plex2Example {
public static void main (String[] argv) {
final One2OneChannel[] a = One2OneChannel.create (2);
final One2OneChannel[] b = One2OneChannel.create (2);
final One2OneChannel c = new One2OneChannel ();
new Parallel (
new CSProcess[] {
new Fibonacci (a[0]),
new Squares (a[1]),
new Sign ("Fibonacci ", a[0], b[0]),
new Sign (" Squares ", a[1], b[1]),
new Plex2 (b[0], b[1], c),
new Printer (c, "", "\n")
}
).run ();
}
}
Implemntation Note
For information, here is the run method for this process:
public void run () {
AltingChannelInput[] input = {in0, in1}; // in0 and in1 are the input channels
Alternative alt = new Alternative (input);
while (true) {
out.write (input[alt.fairSelect ()].read ()); // out is the output channel
}
}
- Author:
- P.H.Welch
- See Also:
Plex
,
Multiplex
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 |
Plex2
public Plex2(AltingChannelInput in0,
AltingChannelInput in1,
ChannelOutput out)
- Construct a new Plex2 process with the input channels
in0 and in1 and the output channel out.
The ordering of the input channels makes no difference
to the behaviour of this process.
- Parameters:
in0
- an input channelin1
- an input channelout
- the output channel
run
public void run()
- The main body of this process.
- Specified by:
run
in interface CSProcess
Submit a bug or feature to jcsp-team@ukc.ac.uk
Version 1.0-rc4 of the JCSP API Specification (Copyright 1997-2000 P.D.Austin and P.H.Welch - All Rights Reserved)
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