WebSphere

Robustness

There are many ways in which a service-oriented architecture (SOA) solution can be made more robust. This section covers some of the ways to increase robustness in an SOA.

Introduction

There are numerous ways in which an SOA solution can be made more robust. For example:
  • Failover support. When a server fails, an application can continue to process work on other servers in the cluster.
  • Persistent messages. Persistent messages are recovered if a failure occurs.
  • Persistent events. You can use the common event infrastructure (CEI) to persistently store and retrieve events.
  • Transactions. Transactions can be a key enabler because they ensure end-to-end data integrity across multiple resources.

Failover support

A clustered environment provides the following SOA-related benefits:
  • Failover support. When a server fails, an application can continue to process work on other servers in the cluster. This allows recovery efforts to proceed without affecting the application users.
  • Maintainability. You can stop a server for planned maintenance without stopping application processing.
  • Flexibility. You can add or remove capacity as needed, by using the administrative console of the deployment manager.

Persistent messages

Messaging systems can be used to send persistent messages.

WebSphere® MQ and other Java™ Message Service (JMS) providers support the following types of message:
  • Persistent messages. Persistent messages are guaranteed to be successfully consumed only once. Messages are not lost.
  • Non-persistent messages. Non-persistent messages are guaranteed to be delivered at most once. Messages can be lost

Persistent messages have a performance impact; therefore, use persistent messages for essential data only.

Persistent Events

CEI provides facilities for the runtime environment to persistently store and retrieve events.

You can use the Event Emitter mediation primitive to send out business events, during a mediation flow. The events are generated in the form of Common Base Events (CBE) and are sent to a CEI server.


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Timestamp icon Last updated: 20 June 2010 00:38:42 BST (DRAFT)


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