A JBoss Cache instance is quite resource consuming and by default we will have 3 JBoss Cache instances (one instance for the indexer, one for the lock manager and one for the data container) for each workspace, so if you intend to have a lot of workspaces it could make sense to decide to share one JBoss Cache instance with several cache instances of the same type (i.e. indexer, lock manager or data container). This feature is disabled by default and can be enabled at component configuration level (i.e. indexer configuration, lock manager configuration and/or data container configuration) by setting the property "jbosscache-shareable" to true as below:

<property name="jbosscache-shareable" value="true" />

Once enabled this feature will allow the JBoss Cache instance used by the component to be re-used by another components of the same type (i.e. indexer, lock manager or data container) with the exact same JBoss Cache configuration (except the eviction configuration that cans be different), which means that all the parameters of type ${jbosscache-<parameter name>} must be identical between the components of same type of different workspaces. In other words, if we use the same values for the parameters of type ${jbosscache-<parameter name>} in each workspace, we will have only 3 JBoss Cache instances (one instance for the indexer, one for the lock manager and one for the data container) used whatever the total amount of workspaces defined.