org.jcsp.plugNplay
Class ProcessWrite

java.lang.Object
  org.jcsp.plugNplay.ProcessWrite

All Implemented Interfaces:

CSProcess

public class ProcessWrite
extends Object
implements CSProcess

Writes one Object to its output channel.

Process Diagram

Description

ProcessWrite is a process that performs a single write to its out channel and then terminates. The Object that is written must first be placed in the public value field of this process (which is safe to set before and in between process runs).

ProcessWrite declaration, construction and use should normally be localised within a single method -- so we feel no embarassment about its public field. Its only (envisaged) purpose is as described in the example below.

Channel Protocols

Output Channels
out	java.lang.Object	The out Channel can accept data of any Class.

Example

ProcessWrite is designed to simplify writing in parallel to channels. Make as many instances as there are channels, binding each instance to a different channel, together with a Parallel object in which to run them:

   ChannelOutput out0, out1;
   .
   .
   .
   ProcessWrite write0 = new ProcessWrite (out0);
   ProcessWrite write1 = new ProcessWrite (out1);
   CSProcess parWrite01 = new Parallel (new CSProcess[] {out0, out1});
 

The above is best done once, before any looping over the parallel write commences. A parallel write can now be performed at any time (and any number of times) by executing:

     write0.value = ...;   // whatever we want sent down out0
     write1.value = ...;   // whatever we want sent down out1
     parWrite01.run ();
 

The last line above terminates when, and only when, both writes have completed -- the events may occur in any order.

Author:

P.H. Welch and P.D. Austin

See Also:

Parallel, ProcessRead, ProcessReadInt, ProcessWriteInt

Field Summary

Object

value The Object to be written to the channel

Constructor Summary

ProcessWrite(ChannelOutput out)
Construct a new ProcessWrite.

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

Field Detail

value

public Object value

The Object to be written to the channel

Constructor Detail

ProcessWrite

public ProcessWrite(ChannelOutput out)

Construct a new ProcessWrite.

Parameters:

out - the channel to which to write

Method Detail

run

public void run()

The main body of this process.

Specified by:

run in interface CSProcess