Memory Management
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- Running garbage collection can have an impact on the response time of a time critical thread.
- It is necessary to have memory that is not subject to GC.
- Provides two alternatives to traditional Java heap memory:
- Immortal Memory
- Scoped Memory
- Both types of area are represented by the abstract javax.realtime.MemoryArea class.
- Only javax.realtime.Schedulable objects are allowed to enter into a MemoryArea. If standard Java threads attempt to get in then an IllegalThreadStateException is thrown.
- Schedulable objects must explicitly indicate the MemoryArea to allocate objects from, otherwise the standard Java heap will be used.
Immortal Memory
- The memory associated with objects allocated in immortal memory is never GC'ed and never released during the lifetime of the application.
- The programmer can reuse the memory by other means. e.g. by maintaining a pool of reusable objects.
