org.jcsp.lang
Class AltingConnectionClient

java.lang.Object
  org.jcsp.lang.Guard
      org.jcsp.lang.AltingConnectionClient

All Implemented Interfaces:

ConnectionClient

Direct Known Subclasses:

AltingConnectionClientImpl

public abstract class AltingConnectionClient
extends Guard
implements ConnectionClient

This class is sub-classed by JCSP.NET classes to provide ConnectionClient objects which can have their receive() method alted over.

Although JCSP users could sub-class this class, under most circumstances, there is no need. AltingConnectionClient objects can be constructed using one of the Connection factory mechanisms. See Connection and StandardConnectionFactory.

Author:

Quickstone Technologies Limited

Constructor Summary

protected

AltingConnectionClient(AltingChannelInput altingChannel) Constructor.

Method Summary

protected AltingChannelInput	getAltingChannel() Returns the channel used to implement the Guard.
boolean	pending() Returns whether there is an open() pending on this connection.
protected void	setAltingChannel(AltingChannelInput chan) ConnectionServer implementations are likely to be implemented over channels.

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.ConnectionClient

isOpen, reply, request

Constructor Detail

AltingConnectionClient

protected AltingConnectionClient(AltingChannelInput altingChannel)

Constructor.

Note that this is only intended for use by JCSP, and should not be called by user processes. Users should use one of the subclasses.

Parameters:

altingChannel - The channel used to implement the Guard

Method Detail

getAltingChannel

protected AltingChannelInput getAltingChannel()

Returns the channel used to implement the Guard.

Note that this method is only intended for use by JCSP, and should not be called by user processes.

Concrete subclasses should override this method to return null, to ensure that the alting channel is kept private.

Returns:

The channel passed to the constructor.

setAltingChannel

protected void setAltingChannel(AltingChannelInput chan)

ConnectionServer implementations are likely to be implemented over channels. Multiple channels from the client to server may be used; one could be used for the initial connection while another one could be used for data requests.

This method allows sub-classes to specify which channel should be the next one to be alted over.

Parameters:

chan - the channel to be ALTed over.

pending

public boolean pending()

Returns whether there is an open() pending on this connection.

Note: if there is, it won't go away until you accept it. But if there isn't, there may be one by the time you check the result of this method.

Returns:

true only if open() will complete without blocking.