org.lsst.ccs.subsystem.proxies

Class TcpProxy

java.lang.Object

java.util.Observable

org.lsst.ccs.framework.Module

org.lsst.ccs.subsystem.proxies.TcpProxy

All Implemented Interfaces:

Observer, org.lsst.ccs.framework.Configurable, org.lsst.ccs.framework.SignalHandler

public class TcpProxy
extends org.lsst.ccs.framework.Module

These modules act as proxies to other part of the application that can communicate through TCP-IP. The communication protocol is rather simple

• There is on the module a TCP server that listens to connection
• client code connects and registers a name for the client
• under that name the server creates a thread that maintains a Socket with this client. if the Socket is broken, the client is deregistered and a Status/LOG is sent
• Methods:
  • call(client,String args)a an ACK is sent to requester, by the subsystem A text response is synchronously waited for and is sent back to requester. the Strings are sent/read as ISO-8859-1
  • close(client) closes the context of this client (thread, task queue)
  • shutdown closes the server
  • restart restart server

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	TcpProxy.ClientContext this class is going to changed.

Nested classes/interfaces inherited from class org.lsst.ccs.framework.Module

org.lsst.ccs.framework.Module.ValueUpdate

Nested classes/interfaces inherited from interface org.lsst.ccs.framework.Configurable

org.lsst.ccs.framework.Configurable.Environment

Field Summary

Fields inherited from class org.lsst.ccs.framework.Module

environment, log, name, nObserverThreads, tickMillis

Constructor Summary

Constructors

Constructor and Description
TcpProxy()

Method Summary

Modifier and Type	Method and Description
void	addObserver(ASyncObserver<TcpProxy.ClientContext> observer)
Object	call(String clientName, String command)
protected TcpProxy.ClientContext	getContextFor(String clientName)
int	getPortNumber()
void	initModule()
boolean	isReady(String clientName)
void	removeObserver(ASyncObserver<TcpProxy.ClientContext> observer)
void	setPortNumber(int portNumber)
void	stop()

Methods inherited from class org.lsst.ccs.framework.Module

alias, getComponentDictionariesTree, getComponentTree, getContext, getEnvironment, getMainDictionary, getModule, getName, getNObserverThreads, getObservables, getSubsystem, getTickMillis, init, listens, percolateSignal, postStart, processUpdate, publishData, publishData, publishData, publishData, publishData, publishData, publishData, sendSignal, sendSignal, sendSignalWithTimeLimit, sendToReply, sendToStatus, setBeanName, setContext, setEnvironment, setName, setNObserverThreads, setObservables, setStateModularSubsystem, setStateModularSubsystem, setTickMillis, shutdownNow, signal, startTicking, tick, update

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.lsst.ccs.framework.Configurable

change, getCheckedValueFromConfiguration, getChildren, getComponentByName, getDictionary, getParent, getParentObject, injectResources, listChildren, notifyChange, notifyChangeWithoutPreliminaryChecks, proceduralWalk, publish, publish, publish, publish, publish, publish, start, treeWalk

Constructor Detail

TcpProxy

public TcpProxy()

Method Detail

getContextFor

protected TcpProxy.ClientContext getContextFor(String clientName)

addObserver

public void addObserver(ASyncObserver<TcpProxy.ClientContext> observer)

removeObserver

public void removeObserver(ASyncObserver<TcpProxy.ClientContext> observer)

initModule

public void initModule()

Overrides:

initModule in class org.lsst.ccs.framework.Module

stop

public void stop()

isReady

public boolean isReady(String clientName)

call

public Object call(String clientName,
                   String command)

getPortNumber

public int getPortNumber()

setPortNumber

public void setPortNumber(int portNumber)