Book Image

Oracle Service Bus 11g Development Cookbook

Book Image

Oracle Service Bus 11g Development Cookbook

Overview of this book

Oracle Service Bus 11g is a scalable SOA integration platform that delivers an efficient, standards-based infrastructure for high-volume, mission critical SOA environments. It is designed to connect, mediate, and manage interactions between heterogeneous services, legacy applications, packaged solutions and multiple Enterprise Service Bus (ESB) instances across an enterprise-wide service network. Oracle Service Bus is a core component in the Oracle SOA Suite as a backbone for SOA messaging. This practical cookbook shows you how to develop service and message-oriented (integration) solutions on the Oracle Service Bus 11g. Packed with over 80 task-based and immediately reusable recipes, this book starts by showing you how to create a basic OSB service and work efficiently and effectively with OSB. The book then dives into topics such as messaging with JMS transport, using EJB and JEJB transport, HTTP transport and Poller transports, communicating with the database, communicating with SOA Suite and Reliable Message Processing amongst others. The last two chapters discuss how to achieve message and transport-level security on the OSB.
Table of Contents (19 chapters)
Oracle Service Bus 11g Development Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Consuming messages from a topic with non-durable/durable subscription


Subscribing to and consuming messages from a JMS topic is similar to consuming messages from a JMS queue. The main difference between a topic and a queue is that the topic can have multiple subscribers and that a subscription can either be durable or non-durable. With a durable topic, a message that cannot be delivered due to the subscriber being unavailable will be kept by the JMS server and delivered later when the subscriber is back online.

In this recipe, we will show you how to implement a proxy service as a subscriber for the topic. The proxy service will act as a listener on the JMS topic and will get active as soon as a message arrives in the topic. First we implement the non-durable subscription and show the durable subscription in the There's more... section later.

Getting ready

For this recipe, we need the JMS topic SourceTopic from the OSB Cookbook standard environment.

How to do it...

Let's implement the proxy...