Monday Dec 23, 2013

Coherence*Web: Sharing an httpSession Among Applications in Different Oracle WebLogic Clusters by Jordi Villena

An easy approach to extending Coherence*Web to enable session sharing.
Downloads download-icon13-1 Oracle Coherence & download-icon13-1 Oracle WebLogic.

Standard Configuration

Coherence*Web permits a full session offload so Oracle WebLogic instances can be focused on processing Oracle WebLogic requests; however, in some cases, http sessions are large, and there is a trade-off between the benefits of offloading the whole user session, and reducing the network usage by offloading only the object that needs to be shared among the different web applications. Coherence*Web and Oracle Coherence itself are built with low-latency, non-blocking I/O as a prime function, but it still takes time and bandwidth to transmit when working with large volumes of data. In such situations, it would be useful to be able to select which session attributes must be stored in the local storage of the Oracle WebLogic instances, and which should be leveraged to an Oracle Coherence distributed cache.

The storage configuration in Coherence*Web can be configured in a wide variety of ways. To balance between offloading Oracle WebLogic instances and mitigating the performance lost by storing the whole http session in an Oracle Coherence dedicated node, a subset of session attributes can be stored in the Oracle Coherence external cache via the use of a custom session distribution controller.

Another reason to offload some session attributes from Oracle WebLogic is to share this set of attributes with web applications deployed in different Oracle WebLogic clusters. A session distribution controller allows us to add logic to deduce whether a session attribute must be stored in the distributed cache.

The following sample shows a session distribution controller that stores session attributes whose name begins with "shared_" in the distributed Coherence Layer, as well as any other attribute in the local storage of the Oracle WebLogic managed instance that handles the user request: Read the complete article here.

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