9.2.2. The Object Store

The Java SecurityManager imposes some restrictions on the implementation of persistence. Therefore, the object store provided with JBoss Transaction Service uses the techniques of interface/implementation. The implementations in JBoss Transaction Service write object states to the local file system or a database, or use a client stub to implement an interface to remote services.

When persistent objects are created, they are given unique identifiers, which are actually instances of the Uid class. They can be identified within the object store by using these UIDs. States are read using the read_committed operation and written by the write_committed and write_uncommitted operations.