stella.net

Class ParameterServer.ParameterHandler

java.lang.Object

java.lang.Thread

stella.net.Handler

stella.net.ParameterServer.ParameterHandler

All Implemented Interfaces:

Runnable

Enclosing class:

ParameterServer

protected class ParameterServer.ParameterHandler
extends Handler

The helper class to run the protocol for ascii-based parameter exchanges. In its run method, the queried parameter name is read in from the socket stream, matched to the parameters served by the enclosing class, converted to an ascii-representation and writtn to the output stream of the socket.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields

Modifier and Type	Field and Description
private BufferedReader	buffIn The buffered reader wrapped around the socket's input stream.
private BufferedWriter	buffOut The print writer wrapped around the socket's output stream.
private boolean	cancel Becomes true if the protocol should be terminated.

Fields inherited from class stella.net.Handler

in, out, spawner

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ParameterHandler(ErrorProcessing spawn, Socket client, ThreadGroup group, String name) Constructs a new parameter-request handler.

Method Summary

Modifier and Type	Method and Description
void	cancel() Indicates that the protocol submission should be terminated.
void	init() Wrapps buffered readers/writers around the generic socket streams.
protected void	runProtocol() The main method of the parameter server protocol.

Methods inherited from class stella.net.Handler

close, run

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

buffIn

private BufferedReader buffIn

The buffered reader wrapped around the socket's input stream.

buffOut

private BufferedWriter buffOut

The print writer wrapped around the socket's output stream.

cancel

private boolean cancel

Becomes true if the protocol should be terminated.

Constructor Detail

ParameterHandler

protected ParameterHandler(ErrorProcessing spawn,
                           Socket client,
                           ThreadGroup group,
                           String name)

Constructs a new parameter-request handler. The streams associated to the client-connection socket are opened in the parent class, see Handler.

Parameters:

spawn - A reference to the spawning receiver server.

client - The client-connection socket.

group - The thread group this command handler should run in.

name - The name of the handler thread.

Method Detail

init

public void init()

Wrapps buffered readers/writers around the generic socket streams.

Overrides:

init in class Handler

runProtocol

protected void runProtocol()

The main method of the parameter server protocol. This protocol does the following:

• From the socket's input stream one line is read. This line is equal to the parameter name to look up.
• The received name is matched to the embedding object's look-up table ParameterServer.set.
• If a parameter of the given name was found it is queried to deliver an ascii-representation of the parameter with the SocketParameter.getAscii() method.
• The string representation is writtn to the socket's output stream, or, if the name look-up failed, SocketParameter.NOTDEFINED is writtn.
• The ouput buffer is flushed and the method returns. This closes the socket connection and the associated I/O-streams.

Specified by:

runProtocol in class Handler

cancel

public void cancel()

Indicates that the protocol submission should be terminated. No terminal done is sent back, this method more or less is a surrogate to the deprechated stop method.