Oracle Application Server 10g Essentials [Electronic resources] نسخه متنی

11.5 Service Discovery

Oracle Application Server
provides a UDDI directory you can
use to publish your Web Services on your corporate intranet.
Appropriately, the UDDI directory is maintained using its own set of
Web Services. Additions, updates, deletions, and queries all take
place using SOAP over HTTP.

Oracle provides a Java API for the UDDI SOAP-based Web Services as a
convenience for Java programmers. However, any programming language
that can access a Web Service using SOAP can interact with the
directory.

11.5.1 Publishing a Web Service

Web Services can be published to the
UDDI directory with a user-written program that uses the Java API and
the UDDI publish web service, or during the last step of the EAR file
deployment in Application Server Control. If an EAR
file contains references to one of the Web Services servlets,
Application Server Control displays an additional set of screens
where you can publish Web Services during the deployment of an EAR
file.

11.5.2 Looking Up a Web Service

Consumers can
look up available Web Services using a
user-written program that uses the Java API and the UDDI inquiry Web
Service. The inquiry Web Service allows you to
programmatically perform a query against the UDDI directory as one of
the following:

A White Pages search

Using an organization's name,
contact's name, address, etc.

A Yellow Pages search

Using standardized classifications such as NAICS, ISO-3166, and UNSPSC

A Green Pages search

Using technical information about a service

Oracle Application Server also provides a Java Client library that
allows you to easily build your own directory search engine.

11.5.3 Updating a Web Service

A published Web Services entry in the
UDDI directory can be updated with a
user-written program that uses the Java API or with the UDDI
Registry in Application Server Control. Using the
UDDI Registry, you search for an existing service in the directory by
one of the categorization taxonomies deployed with the registry. Once
you find an entry, you can update any of its fields. You can also add
a service to additional organizational categories.

Figure 11-6 is an example of the UDDI Registry
update screen available through Application Server Control. This
figure shows the update screen for a published service from Example 11-1.

Figure 11-6. Oracle UDDI Registry page

11.5.4 Directory Management

The UDDI Registry itself is managed with the
uddiadmin.jar Java
command-line tool; it allows you to manage properties for the
directory. Here are some examples:

Add and delete directory users

Specify quotas

Modify properties about the registry's own directory
entry

Import entities

Configure and enable replication

In addition, the UDDI Registry supports deployment on Microsoft SQL
Server, IBM DB2, and noninfrastructure-related Oracle databases.