SOA Suite 12c: The Coherence Adapter By Maarten Smeets

Oracle SOA Suite 12c ships with a new technology adapter, the Oracle CoherenceAdapter. This adapter allows easy integration with a Coherence Data Grid (a distributed cache). The excellent post by Antony Reynolds provides the information required to setup your Coherence cache and get started with the adapter. In this blog post I will describe a pattern which can be used to use Coherence Data Grid as a cache for a database table (or view, or…). Also I did some performance measures on the Oracle quickstart JDeveloper installation with Integrated Weblogic server and an XE database with surprising results!

Important tips from Antony’s post:

• Use one Coherence cache per object type. This allows clearing the entire cache and specifying specific behavior per object type.
• Make sure the Coherence configuration file is available to every server in the cluster (shared storage). This is similar to a DbAdapter configuration plan.
• Set the servicename in the outbound connectionFactory of the CoherenceAdapter to DistributedCache so it works in clusters and WLSExtendProxy to false unless you are using this feature.
• In 11c you can use Coherence from within a SOA Suite Spring component or by enabling the OSB result cache. Both have disadvantages though. 12c provides the CoherenceAdapter as alternative. Read the complete article here.

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