10.1. Persistence
To achieve persistence, two capabilities are essential. The first is a process or thread management issue that could be handled at the Operating System (OS) level. The transfer of control capability in e-speak-based systems can be achieved using certain off-the-shelf products, such as Hewlett Packard’s MC ServiceGuard. The second is an application-level issue. The notion of the state of an application or process differs from application to application, and, as a result, must be handled by the application itself. In summary, persistence is both an application-level and an OS-level issue:
OS-level ability to transfer control from one active component (or an instance) to another
Application-level ability to transfer the state
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