examples.jms.messageformat
Class MessageTraderBean

java.lang.Object
  |
  +--examples.jms.messageformat.MessageTraderBean

All Implemented Interfaces:

javax.ejb.EnterpriseBean, javax.ejb.MessageDrivenBean, javax.jms.MessageListener, java.io.Serializable

public class MessageTraderBean

extends java.lang.Object

implements javax.ejb.MessageDrivenBean, javax.jms.MessageListener

This class reads the XML data from a JMS queue, parses it and and calls the statefulSession.TraderBean EJB to actually perform the stock trade transaction. The class then puts the output of the trade on another JMS queue.

Author:

Copyright (c) 2002 by BEA Systems, Inc. All Rights Reserved.

Field Summary

static java.lang.StringBuffer	buffer
static java.lang.String	JMS_FACTORY Defines the JMS connection factory for the queue.
static java.lang.String	JNDI_FACTORY
static java.lang.String	QUEUE Defines the queue.

Constructor Summary

MessageTraderBean()

Method Summary

void	close() Closes all JMS objects.
void	ejbActivate() This method is not used by this example.
void	ejbCreate() This method is not used by this example.
void	ejbPassivate() This method is not used by this example.
void	ejbRemove() This method is not used by this example.
void	init(javax.naming.Context ctx, java.lang.String queueName) Creates all the necessary objects for sending messages to a JMS queue.
void	onMessage(javax.jms.Message msg) Retrieves the XML data from the first JMS queue then parses the data using a SAX parser.
(package private) static void	p(java.lang.String s)
void	send(java.lang.String message) Sends a message in the form of XML data to a JMS queue.
void	setMessageDrivenContext(javax.ejb.MessageDrivenContext ctx) Sets the session context.

Methods inherited from class java.lang.Object

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

Field Detail

buffer

public static final java.lang.StringBuffer buffer

JMS_FACTORY

public static final java.lang.String JMS_FACTORY

Defines the JMS connection factory for the queue.

JNDI_FACTORY

public static final java.lang.String JNDI_FACTORY

QUEUE

public static final java.lang.String QUEUE

Defines the queue.

Constructor Detail

MessageTraderBean

public MessageTraderBean()

Method Detail

close

public void close()
           throws javax.jms.JMSException

Closes all JMS objects.

Throws:

javax.jms.JMSException - if JMS fails to close objects due to internal error

ejbActivate

public void ejbActivate()

This method is not used by this example.

ejbCreate

public void ejbCreate()
               throws javax.ejb.CreateException

This method is not used by this example.

ejbPassivate

public void ejbPassivate()

This method is not used by this example.

ejbRemove

public void ejbRemove()

This method is not used by this example.

Specified by:

ejbRemove in interface javax.ejb.MessageDrivenBean

init

public void init(javax.naming.Context ctx,
                 java.lang.String queueName)
          throws javax.naming.NamingException,
                 javax.jms.JMSException

Creates all the necessary objects for sending messages to a JMS queue.

Parameters:

ctx - JNDI initial context

queueName - name of queue

Throws:

javax.naming.NamingException - if operation cannot be performed

javax.jms.JMSException - if JMS fails to initialize due to internal error

onMessage

public void onMessage(javax.jms.Message msg)

Retrieves the XML data from the first JMS queue then parses the data using a SAX parser. The method then calls the Trader stateful Session EJB to perform the actual trade on the data. Finally, this method creates a new XML message which will be sent to a second JMS queue.

Specified by:

onMessage in interface javax.jms.MessageListener

Parameters:

msg - the JMS message

p

static void p(java.lang.String s)

send

public void send(java.lang.String message)
          throws javax.jms.JMSException

Sends a message in the form of XML data to a JMS queue.

Parameters:

message - the String message to be sent to the JMS queue

setMessageDrivenContext

public void setMessageDrivenContext(javax.ejb.MessageDrivenContext ctx)

Sets the session context.

Specified by:

setMessageDrivenContext in interface javax.ejb.MessageDrivenBean

Parameters:

ctx - MessageDrivenContext Context for session