edu.sdsc.inca.protocol
Class MessageHandler

java.lang.Object
  edu.sdsc.inca.protocol.MessageHandler

Direct Known Subclasses:

GetLog, LogConfig, Ping, VerifyProtocolVersion

public abstract class MessageHandler
extends java.lang.Object

Author:

Cathie Olschanowsky, Jim Hayes The MessageHandler class should help guide the creation of all of the message handlers for each Inca server.

Field Summary

protected static org.apache.log4j.Logger

logger logger that can be used by all MessageHandlers.

Constructor Summary

MessageHandler()

Method Summary

static void	errorReply(ProtocolWriter writer, java.lang.String msg) A convenience method that logs and writes an error message.
abstract void	execute(ProtocolReader reader, ProtocolWriter writer) Execute should run the task using the reader and writer for in/output.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final org.apache.log4j.Logger logger

logger that can be used by all MessageHandlers.

Constructor Detail

MessageHandler

public MessageHandler()

Method Detail

execute

public abstract void execute(ProtocolReader reader,
                             ProtocolWriter writer)
                      throws java.lang.Exception

Execute should run the task using the reader and writer for in/output. Close the reader and writer to indicate that the client connection should be closed.

Throws:

java.lang.Exception

errorReply

public static void errorReply(ProtocolWriter writer,
                              java.lang.String msg)

A convenience method that logs and writes an error message.

Parameters:

writer - the writer to use to send the error message

msg - the error message