jcsp.plugNplay.ints
Class ProcessReadInt

java.lang.Object
  |
  +--jcsp.plugNplay.ints.ProcessReadInt

All Implemented Interfaces:

CSProcess

public class ProcessReadInt

extends Object

implements CSProcess

Reads one int from its input channel.

Process Diagram

       __________________
  in  |                  |
 -->--|  ProcessReadInt  |
      |__________________|
 

Description

ProcessReadInt is a process that performs a single read from its in channel and then terminates. It stores the read int in the public value field of this process (which is safe to examine after the process has terminated and before it is next run).

ProcessReadInt 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

Input Channels
in	int	All channels in this package carry integers.

Example

ProcessReadInt is designed to simplify reading in parallel from 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:

   ChannelInputInt in0, in1;
   .
   .
   .
   ProcessReadInt read0 = new ProcessReadInt (in0);
   ProcessReadInt read1 = new ProcessReadInt (in1);
   CSProcess parRead01 = new Parallel (new CSProcess[] {in0, in1});
 

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

     parRead01.run ();
 

This terminates when, and only when, both reads have completed -- the events may occur in any order. The values read may then be found in read0.value and read1.value, where they may be safely accessed up until the time that parRead01 is run again.

Author:

P.D.Austin

See Also:

Parallel, ProcessRead, ProcessWrite, ProcessWriteInt

Field Summary

int	value The int read from the channel

Constructor Summary

ProcessReadInt(ChannelInputInt in)
Construct a new ProcessReadInt.

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 int value

The int read from the channel

Constructor Detail

ProcessReadInt

public ProcessReadInt(ChannelInputInt in)

Construct a new ProcessReadInt.

Parameters:

in - the channel from which to read

Method Detail

run

public void run()

The main body of this process.

Specified by:

run in interface CSProcess