using message-driven beans in a service-oriented architecture dave chappell vp & chief...

Using Message-Driven Beans in a Service-Oriented Architecture

Dave Chappell VP & Chief Technology Evangelist, Sonic Software


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Sonic SoftwareSonic Software

1st J2EE 1.3 Certified MOM!

HTTP(S), XML, SOAP, WSDL, JMS, JCA

Java Message Service (JMS)

Apache Axis

Web services, JAXM, J2EE CA

XML Schema

ebXML

WS-I

Driving Industry Standards


SonicMQ AppServer IntegrationSonicMQ AppServer Integration

Borland Appserver

HP/Bluestone Total-e-server

BEA Weblogic– CMT,Clustering, Failover/Reconnect, Design Patterns

IBM WebSphere

Oracle Appserver

MacroMedia

JBoss (soon)


Sonic SoftwareSonic Software

Recognized: Enterprise messagingIntegration middleware

Established: Over 500 of Global 2000 rely on Sonic Software

Strong Independent operating company of Progress Backing: Software Corp. (NASDAQ: PRGS)

$170M cash, no debt Distribution in 65 countries, 24x7 world-wide support

History: SonicMQ released 12/1999, #1 JMS productToday SonicMQ 4.0, SonicXQ 1.0 Enterprise Service Bus


AgendaAgenda

J2EE Message Driven Topology

JMS Overview

Using JMS With EJBs

JMS and XA Integration

J2EE Connector Architecture

Service Oriented Architectures and Web Services


EJB ContainersEJB Containers

J2EE TopologyJ2EE Topology

Web ContainersWeb Containers

JSPJSP

servletservlet servletservlet

JSPJSP

servletservlet

EJBEJB

htmlhtml

gifsgifs jpegsjpegs

xmlxml

Presentation Logic Business Logic

xmlxml

EIS

DatabaseDatabaseEJBEJB

EJBEJB

EJBEJB EJBEJB

EJBEJBEJBEJB

EJBEJB

EJBEJB

Internet


J2EE Topology – Message DrivenJ2EE Topology – Message Driven

Web Containers

Web Containers

servletservlet servletservlet

JSPJSP

gifsgifs jpegsjpegs

htmlhtml

Presentation Logic Business Logic

EIS

DatabaseDatabaseInternet

EJBContainers

EJBContainers

EJBEJB

EJBEJB

EJBEJB

MDBMDB

MDBMDB

MDBMDB

EJBContainers

EJBContainers

EJBEJB

EJBEJB

EJBEJB

MDBMDB

MDBMDB

MDBMDB

JMSJMS


J2EE Topology – Message DrivenJ2EE Topology – Message Driven

Business Partner

EJB ServerEJB Server



BrokerBroker

Head Office



EJB ServerEJB ServerBrokerBroker

Business Partner

Trading Partner

BrokerBroker

EJB ServerEJB ServerEJB ServerEJB Server

BrokerBroker

Regional Office


AgendaAgenda


JMS Overview

Using JMS With EJBs





Java Message Service (JMS)Java Message Service (JMS)

Sun standard

Common APIs

Loosely-coupled asynchronous processing– Senders and receivers abstractly decoupled from

each other

– Destinations administratively configurable at runtime

Point to Point and Pub/Sub messaging models

Supports synchronous or asynchronous communication


Java Message Service (JMS)Java Message Service (JMS)

Message delivery semantics– Guaranteed Once-and-only-once

– At-most-once

Deployment architecture not addressed by specification– Vendor differentiators


Java Message ServiceJava Message Service

BusinessApplication A

JMS Messaging API

JMS Messaging Client

…standards based API…

Messaging Components

BusinessApplication A

JMS Messaging API

JMS Messaging Client

JMSProvider


Broad Range of Message TypesBroad Range of Message Types

BytesMessage

Message

MapMessage

ObjectMessage

StreamMessage

TextMessage

Included in JMS Specification

XMLMessage

Extensions in SonicMQ

MultiPartMessage


JMS MessagesJMS Messages

Message

Header

Properties

Body

Used to identify and route the Used to identify and route the messagemessage

The actual “payload” of themessage (five different types,

plus XML and Multipart for SonicMQ)

Support application-specific values passed with the

message


JMSProvider

JMSProviderPublisherPublisher SubscriberSubscriberSubscriberSubscriber

PersistentPersistentStoreStore

7. publish()method returns

2. 2. DisconnectDisconnect

5. Message retained in

persistent store

1. Subscribe6. Ack

8. Connect

10. Receive

4. Persist

3. Send

9. Retrieve

Persistent messages and durable subscriptions

JMS ReliabilityJMS Reliability



JMSProvider

JMSProvider

1. Send

3. commit()

2. Send

4. Receive

6. commit()

5. Receive ConsumerConsumerConsumerConsumerProducerProducerProducerProducer

Transactional Message Send and Receive



JMSProvider

JMSProvider

1. SendProducerProducerProducerProducer

XA Compliant Transaction Manager

ExternalResource(DB/EJB)

2. Update

commit()rollback()


Filtering with message selectorsFiltering with message selectors

Message Server

Publisher

Departments.Sales

SubscriberDepartments.SalesPipeline > 15000

JMSPriority = 2Pipeline = 20000

delivered

SubscriberDepartments.SalesJMSPriority > 5

not delivered

SubscriberDepartments.SalesJMSPriority >= 2 AND Pipeline > 10000

delivered

SubscriberDepartments.SalesPipeline > 20000

notdelivered


JMS as a J2EE ResourceJMS as a J2EE Resource

2 Requirements to access a Message Provider– ConnectionFactory

Creates connection to JMS providers

– Destination Object The Specific Topic or Queue


Obtaining the ConnectionFactoryObtaining the ConnectionFactory

Resource Manager Connection Factories as Administered Objects– Specify standard mechanism for getting

connections to resources outside the J2EE component

– Enables the container to do pooling

JNDI is used for maximum portability

QueueConnectionFactory qcf = (QueueConnectionFactory) ctx.lookup("java:comp/env/jms/TrafficConFactory");


Accessing the DestinationAccessing the Destination

The Specific Queue or Topic

Retrieved via JNDI– Specified in the Deployment Descriptor

– Binding to a real Destination done at deploy time

Topic traffic = (Topic) ctx.lookup("java:comp/env/jms/TrafficTopic");


What the Java/API looks likeWhat the Java/API looks like

// Create a connection factoryTopicConnectionFactory factory;factory = (TopicConnectionFactory)jndi.lookup("TopicConnectionFactory");

// Create a connectionconnect = factory.createTopicConnection (username, password);

// Create a sessionsession = connect.createTopicSession(true, Session.AUTO_ACKNOWLEDGE);

// Create a topics.Topic topic = (Topic)jndi.lookup("chat");



// Create Subscriber to application topics.TopicSubscriber subscriber = session.createSubscriber(topic);

// Initialize the onMessage() message handler.subscriber.setMessageListener(this);

// Create a publisherpublsher = session.createPublisher(null); // Topic will be set for each reply

// Now setup is complete, start the Connectionconnect.start();



public void onMessage( javax.jms.Message message){ TextMessage textMessage = (TextMessage) message; System.out.println(textMessage.getText());}

-- OR –... while( true ){ textMessage = (javax.jms.TextMessage)qReceiver.receive(1000);...


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AgendaAgenda


JMS Overview

Using JMS With EJBs





createlookupremove

EJB Design Pattern ReminderEJB Design Pattern Reminder

client

Remote interface stubs

home

object

context

bean

Server provides resource mgmt

Container

methods

DeploymentDescriptor

Automatically invokes services based onrequirements defined in deployment descriptor

createlookupremove

methods


MessageDrivenBeanMessageDrivenBean

EJB ContainerEJB Container

PublisherBean

PublisherBean

EJB ContainerEJB Container

SubscriberMsg-driven

Instance

SubscriberMsg-driven

Instance

DatabaseDatabaseDurableSubscription

DurableSubscription

ClientApp

ClientApp

Publishes

Acknowledges

Delivers

Stores


ContainerContainer

Msg-driven Bean ClassMsg-driven Bean Class

JMS ProviderJMS Provider

MessageDrivenBeanMessageDrivenBean

Defined in EJB 2.x Specification

Benefits – Simple to write

– Allow for asynchronous execution

DestinationDestination

Msg-drivenBean

instances

Msg-drivenBean

instancesConsumerConsumer


MessageDrivenBeanMessageDrivenBean Executes on receipt of a JMS message

– javax.jms.MessageListener interface Shares the following characteristics of stateless session bean

– Is stateless and relatively short- lived

– Security

– Transactions

– Concurrency

– Management

– All the other services that EJBs enjoy!

– Notable difference: No home or remote interface


MessageDrivenBean InterfaceMessageDrivenBean Interface

javax.ejb.MessageDrivenBean– ejbCreate(), ejbRemove()

– setMessageDrivenContext()

Just like a usual javax.jms.MessageListner– onMessage(javax.jms.Message)


MessageDrivenContextMessageDrivenContext

get/setRollbackOnly()

getUserTransaction()– For BMT only

Others inherited from EJBContext Interface, but not allowed:– getCallerPrincipal()

– isCallerInRole()

– getEJBHome(), getEJBLocalHome()


Serialization and ConcurrencySerialization and Concurrency

Container Must Serialize all calls to an MDB– ejbCreate(), ejbRemove(), etc

– No need to be coded as re-entrant

Concurrency– Container May Launch Multiple Instances of

an MDB No guarantee of order “Cancellation” Message May Arrive Before

“Reservation” Message


MDB ExampleMDB Example

public class SubscriberMsgBean implements MessageDrivenBean {

<… define ejbCreate(), ejbRemove() and

setMessageDrivenContext( MessageDrivenContext mdc) .. >

MessageDrivenContext mdc = null;

public void onMessage( Message inMessage) {

TextMessage msg = (TextMessage) inMessage;

try {

< look up JDBC database >

< store info from message in database >

} catch( Exception e) {

mdc. setRollbackOnly();

}

}

}


MDB Example – Deployment DescriptorsMDB Example – Deployment Descriptors

<message-driven>

...

<ejb-class>SubscriberMsgBean</ejb-class>

<transaction-type>Container</transaction-type>

<jms-message-selector>

NewsType='Metro/Region‘

</jms-message-selector>

<message-driven-destination>

<jms-destination-type>

javax.jms.Topic

</jms-destination-type>

<jms-subscription-durability>

durable

</jms- subscription-durability>

</message-driven-destination>

...

</ message- driven>


AgendaAgenda


JMS Overview

Using JMS With EJBs





Distributed Transaction Processing (DTP)Distributed Transaction Processing (DTP)

TM

RMRM RM

XAXA

XA

XA

XAXA

TM

RMRM

RM

RM

XAXA

XAXA

XA

XA

TM

RMRM

TM

RMRM RM

XAXA

XA

XA

XAXA

TM

RMRM RM

XAXA

XA

XA

XAXA


A local instance of a DTP systemA local instance of a DTP system

TM

RMRMJMS Client


Local DTP zoom inLocal DTP zoom in

EJBEJB

Application Server

SonicMQ ClientSonicMQ Client

JMSProvider

JMSProvider

TransactionManager

TransactionManager

JMS ClientJMS Client

JMS XA APIJMS XA API XA ResourceXA Resource


XA interfacesXA interfaces

JMS XA SPI– XAConnectionFactory

– XAConnection

– XASession

– XAQueueConnectionFactory

– XAQueueConnection

– XAQueueSession

– XATopicConnectionFactory

– XATopicConnection

– XATopicSession


AgendaAgenda


JMS Overview

Using JMS With EJBs





J2EE DirectionsJ2EE Directions

J2EE 1.3– Web Applications

– Asynchronous JMS MDB

– EJB 2.0

J2EE 1.4– SOA Platform

– Web Services JAX-RPC JSR-109

– J2EE Connector Architecture

– EJB 2.1 WSEI


J2EE Connector Architecture OverviewJ2EE Connector Architecture Overview

Defines standard for connecting J2EE to enterprise information systems (EIS)

System contracts define interface specification with EIS– Connection, Transaction, Security

Enterprise Information

System

Resource Adapter

Application Serveror EAI Framework

System Contract

EIS Interface


J2EE Connector Architecture OverviewJ2EE Connector Architecture Overview

Resource adapters– Implements the EIS side of the

system contracts– System-level software drivers for

connecting to an EIS– Enables vendors to create standardized

connectors to EIS

Common client interface– Standard API for applications to

interact with heterogeneous EIS

Enterprise Information

System

Resource Adapter

Application Serveror EAI Framework

System Contract

EIS Interface


Inbound Communication ModelInbound Communication Model

ResourceAdapter

JMSDestination

EnterpriseJava

Beans

JCA Container

WorkManager

Connection PoolManager

TransactionManager

SecurityManager

WorkMgmt

JMSDisp

EJBDisp


AgendaAgenda


JMS Overview

Using JMS With EJBs





Service-Oriented ArchitectureService-Oriented Architecture

Global Enterprise

Internet

WebService

WebService

Credit CheckWeb ServiceCredit CheckWeb Service

Supplier FulfillService

Supplier FulfillService

WebService

WebService

InvoicingService

InvoicingService

SalesServiceSales

Service

Special OrdersSpecial OrdersOrder

Processing

Order Processing

Regional Sales

Regional Sales

PartnerApp

PartnerApp

Inventory Lookup

Inventory Lookup

CustomerApp

CustomerApp

PartnerApp

PartnerApp

Check InvService

Check InvServiceOrder Entry

ServiceOrder Entry

Service


Service-Oriented Architectures (SOA)Service-Oriented Architectures (SOA)

System design methodology using existing application components

Applications expose functionality through service interfaces– Loosely-coupled, asynchronous, coarse-grained

Distributed across internal networks or the Internet

Web services – Software services built on standards: SOAP, WSDL,

UDDI, XML, HTTP

Architecture for a Distributed World


Web Services Technology StackWeb Services Technology Stack

Publication and Discovery(UDDI, ebXML Registry)

Description Language(WSDL)

Data Formatting(XML Dujour)

Transport(HTTP, SMTP, TCP/IP)

XML-RPC(SOAP-RPC, JAX-RPC)

XML Messaging(SOAP, ebXML,JAXM)


Web Services Technology StackWeb Services Technology Stack

XML-RPC(SOAP-RPC, JAX-RPC)

Publication and Discovery(UDDI, ebXML Registry)

Description Language(WSDL)

Data Formatting(XML Dujour)

Transport(HTTP, SMTP, TCP/IP)

XML Messaging(SOAP, ebXML,JAXM)

Quality of ServiceJMS, ebXML-MS, HTTPR


Connecting (Web) Services TogetherConnecting (Web) Services Together

(Web) Services aren’t Islands of Themselves Network of Cooperative Services Interfaces, Discovery, and Data Formats are only part

of the big picture– Data transformation – Intelligent Routing based on content– End-to-end guaranteed delivery– Management, configuration, and auditing – Performance and scalability – Asynchronous and synchronous messaging– Security – Deployment tools

What Else Do You Need?


Standards Working Together...Standards Working Together...

JAXM/RPC Client

Apache Client

Servlet Container

.NET SOAP Client

JMSmessage

SOAP/HTTPSOAP/HTTP

Web Client

SOAP/HTTPSOAP/HTTP SOAP/HTTPSOAP/HTTP SOAP/HTTPSOAP/HTTP

Internet

JMS Messaging BackboneJMS Messaging Backbone

SOAP/HTTPSOAP/JMS

SOAP/HTTPSOAP/JMS

SOAP/HTTPSOAP/JMS

JMSmessage

JMSmessage

JMSmessage

JCA/EISEJB

ContainerJMS Client C++ ClientJCA/EIS


Contact InformationContact Information

[email protected]

http://www.sonicsoftware.com

Integrate with Ease. Extend at WillIntegrate with Ease. Extend at WillTMTM..

using message-driven beans in a service-oriented architecture dave chappell vp & chief...

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