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Patterns: Implementing Self-Service in an SOA Environment by Fernando Teixeira, Shashi Shrimali, Peter Hood, Sandy Grewal, Diego Cotignola, Anup Aggarwal, Carla Sadtler

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80 Patterns: Implementing Self-Service in an SOA Environment
service integration bus link, these links must be configured in both directions
in order for the two buses to be able to communicate. At runtime, messages
that are routed to a foreign bus will flow across the corresponding link.
5.2.3 ESB capabilities
WebSphere Application Server V6 provides several runtime features that support
ESB capabilities. It has support for Web services standards and for programming
models that enable data and message manipulation. Development tools for
WebSphere Application Server, such as Rational Application Developer, include
tools and wizards that simplify the development of application, framework, or
infrastructure code to leverage those runtime features.
WebSphere Application Server provides, through the service integration bus
component, communication infrastructure for messaging and Web services
applications that enables it to support the communication and message
processing requirements of an ESB. WebSphere Application Server and tools
also provide support for a wide variety of integration methods, either directly
(databases, J2EE connectors, and so forth) or through support for Enterprise
Application Integration middleware (such as WebSphere MQ).
WebSphere Application Server V6 meets the ESB capabilities that the following
sections describe.
Communication
WebSphere Application Server supports all of the minimum and extended
capabilites that we have defined for communication, including support for:
򐂰 SOAP-based Web service hosting and invocation
򐂰 Asynchronous messaging
The support is provided by the service integration bus component that
provides a JMS V1.1 compliant JMS provider for reliable message transport.
򐂰 Synchronous messaging with HTTP and HTTPS transports
򐂰 Point-to-point, request/response, fire and forget, events, and
publish/subscribe styles of messaging
򐂰 Routing support that allows:
Dynamic service and port selection
Web service requests converted from one WSDL definition to another
Internet routing with proxy
򐂰 WSDL as the service interface definition and the service implementation
definition
WSDL can publish services to a UDDI directory.
Chapter 5. Product mappings and product overview 81
Integration
WebSphere Application Server supports all of the minimum and extended
capabilites that we have defined for integration, including support for:
򐂰 JDBC used for connectivity to external data sources, for example, a relational
database.
򐂰 Protocol transformation capability comes in the form of the service integration
bus supporting transformation from SOAP/HTTP to SOAP/JMS and vice
versa.
򐂰 Existing software and application adapters can be incorporated into the
system by implementing the J2EE Connector Architecture support for
connecting the J2EE platform to heterogeneous Enterprise Information
Systems (EIS). Examples include ERP, mainframe transaction processing,
database systems, and existing applications not written in the Java
programming language.
򐂰 Connectivity to enterprise application middleware
The service integration bus is tightly integrated with WebSphere MQ.
Connections can be defined so that WebSphere MQ queue managers view a
service integration bus as a queue manager, and so the service integration
bus views queue managers as another bus. The JMS support means
messages can be exchanged with any other JMS V1.1 compliant provider.
򐂰 Data enrichment of services messages within the ESB
The service integration bus provides mediation support that allows
processing of in-flight messages. Examples of the processing that can be
performed by a mediation are transforming a message from one format into
another, routing messages to one or more target destinations that were not
specified by the sending application, augmenting messages by adding data
from a data source, and distributing messages to multiple target destinations.
򐂰 WebSphere Application Server is a fully J2EE V1.4 compliant application
server.
򐂰 Language interfaces for service invocation
WebSphere Application Server supports Java interfaces. It provides Web
service support so that it can act as both a Web service provider and as a
consumer. As a provider, it hosts Web services that are published for use by
clients. As a consumer, it hosts applications that invoke Web services from
other locations
Security
WebSphere Application Server supports some of the extended capabilites that
we have defined for security, including support for:

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