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
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
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These configuration 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:
- idleTimeoutSeconds: Time in seconds a 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 a 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 idleTimeoutSeconds and maxSize to 0.
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