Patterns: Implementing Self-Service in an SOA Environment

334 Patterns: Implementing Self-Service in an SOA Environment

򐂰 A Gateway instance enables a user to create gateway and proxy services.

򐂰 A

Gateway service exposes external Web services as bus-managed Web

services.

򐂰 A

Proxy service exposes external Web services as bus-managed Web

services, but with the added feature of allowing runtime control over the target

service endpoint that is called.

򐂰 A

Mediation is a stateless session EJB attached to a service destination that

can apply processing to messages that pass through it, for example, logging

or message transformation.

򐂰

JAX-RPC handler is a J2EE standard for intercepting and manipulating Web

services messages.

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JAX-RPC handler list is used to manage JAX-RPC handlers by determining

the order in which they are executed. These lists can be associated with bus

services.

򐂰 The

UDDI reference contains configuration information for UDDI registries to

which the bus is able to connect.

10.7.2 Configuration tasks

In the ITSOMart scenario, we have chosen to use the service integration bus as

our implementation of the ESB. The configuration tasks that need to be done in

order to run the credit check portion of the application are as follows:

1. Create an endpoint listener.

2. Create the outbound services.

3. Create the inbound services.

4. Generate and export new WSDL for the services.

5. Update the Web service clients to use the bus.

6. Configure the router mediation.

Preparation: Our scenario assumes that you have done the following:

1. Created a bus and added the application server as a member. The bus

definition is fundamental to most other configuration tasks. It is not possible

to begin creating or configuring any services or gateway resources until a

bus object has been created. One bus is normally sufficient to handle all

application servers in a cell. In our scenario, we use one bus called

ITSOMartBus.

For information about creating the bus and adding the members, see

“Create a service integration bus” on page 463.

2. Installed the Web services support for the bus. For information about how

to do this, see “Install Web services support for the bus” on page 464.