Clustering with Stateful Session Beans in JBoss

 

Clustering with Stateful Session Beans in JBoss

Stateful Session Beans have a state for a client Fail-over and Reliability ⇒ Fault-tolerant State managed by JBoss Cache To enable clustering for SFSB, it works the same way as clustering SLSB except that:

• There is only one load-balancing policy available: FirstAvailable (default for SFSB)
•  This time JBoss Cache is used because the state has to be managed

 

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sfsb-cache cache configuration is located in:

• deploy/cluster/jboss-cache-manager.sar/META-INF/jboss-cache-configs.xml(You can enable this file in the JBoss-cache-manager-jboss-beans.xml file): Describes cache configuration using the standard JBC 3.x config format
•  deploy/cluster/jboss-cache-manager.sar/META-INF/jboss-cache-manager-jboss-beans.xml: Describes cache configuration using the microcontainer format

These configurations affect all SFSB. You can override this configuration for your SFSB though:

• By annotating with @org.jboss.ejb3.annotation.CacheConfig
•  In the jboss.xml file with <cache-config>...</cache-config>

The parameters you can configure are the following:

•  idle-timeout seconds: Time in seconds an SFSB can be unused before being passivated (default 300)
•  maxSize: maximum number of beans that can be cached (default 10000)
• name: Specify the name of the cache configuration. sfsb-cache is the default for SFSB
• removalTimeoutSeconds: Time in seconds an SFSB can be unused before being deleted by the cache (default 0)
•  replicationIsPassivation: Should a replication be considered as passivation? (default true)

Example: To disable passivation, you could set idle-timeout seconds and maxSize to 0.

For an in-depth understanding on JBoss click on:

• JBoss architecture
• Installation of JBoss
• Session Configuration
• JBoss Overview