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## javolution.context
Class ImmortalContext

    java.lang.Object
      javolution.context.Context
          javolution.context.AllocatorContext
              javolution.context.ImmortalContext

All Implemented Interfaces:
  java.io.Serializable, XMLSerializable

    public final class ImmortalContext

extends AllocatorContext

This class represents an allocator from immortal memory (RTSJ).

It is typically used to allocate (and recycle) from immortal memory allowing dynamically created static instances to be accessible by `NoHeapRealtimeThread`:``

             public synchronized Text intern() {
                 if (!INTERN_INSTANCES.containsKey(this)) {
                     ImmortalContext.enter();
                     try { // Forces interned instance to be in immortal memory.
                         Text txt = this.copy(); // In ImmortalMemory.
                         INTERN_INSTANCES.put(txt, txt);
                     } finally {
                         ImmortalContext.exit();
                     }
                 }
                 return (Text) INTERN_INSTANCES.get(str);
             }

Because class initialization may occur while running in a non-heap context, it is recommended to force factory produced constants to immortal memory:``

             public class Rational {
                 public static final Rational ZERO;
                 public static final Rational ONE;
                 ...
                 static { // Forces constants to ImmortalMemory.
                     ImmortalContext.enter();
                     try {
                         ZERO = Rational.valueOf(0, 1); // Factory produced.
                         ONE = Rational.valueOf(1, 1); // Factory produced.
                     } finally {
                         ImmortalContext.exit();
                     }
                 }
            }

Version:
  5.2, August 19, 2007
Author:
  Jean-Marie Dautelle
See Also:
  Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class javolution.context.AllocatorContext
`AllocatorContext.Reference<T>`

Field Summary

Fields inherited from class javolution.context.AllocatorContext
`DEFAULT`

Fields inherited from class javolution.context.Context
`ROOT`

Method Summary
`protected void` | `deactivate()` Deactivates the `allocators` belonging to this context for the current thread.
`static void` | `enter()` Enters an immortal memory context.
`protected void` | `enterAction()` The action to be performed after this context becomes the current context.
`static void` | `exit()` Exits the current immortal memory context.
`protected void` | `exitAction()` The action to be performed before this context is no more the current context.
`protected Allocator` | `getAllocator(ObjectFactory factory)` Returns the allocator for the specified factory in this context.

Methods inherited from class javolution.context.AllocatorContext
`getCurrent, getDefault, outerCopy, outerCopy, outerExecute`

Methods inherited from class javolution.context.Context
`enter, enter, exit, exit, getOuter, getOwner, setCurrent, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Method Detail

### enter

    public static void enter()

  Enters an immortal memory context.

### exit

    public static void exit()

  Exits the current immortal memory context.

  Throws:
    `java.lang.ClassCastException` - if the context is not an immortal context.

### deactivate

    protected void deactivate()

  Description copied from class: `AllocatorContext`
  Deactivates the `allocators` belonging to this context for the current thread. This method is typically called when an inner allocator context is entered by the current thread, when exiting an allocator context or when a concurrent executor has completed its task within this allocator context. Deactivated allocators have no `user` (`null`).

  Specified by:
    `deactivate` in class `AllocatorContext`

### getAllocator

    protected Allocator getAllocator(ObjectFactory factory)

  Description copied from class: `AllocatorContext`
  Returns the allocator for the specified factory in this context.

  Specified by:
    `getAllocator` in class `AllocatorContext`
  Parameters:
    `factory` - the factory for which the allocator is returned.
  Returns:
    the allocator producing instances of the specified factory.

### enterAction

    protected void enterAction()

  Description copied from class: `Context`
  The action to be performed after this context becomes the current context.

  Specified by:
    `enterAction` in class `Context`

### exitAction

    protected void exitAction()

  Description copied from class: `Context`
  The action to be performed before this context is no more the current context.

  Specified by:
    `exitAction` in class `Context`

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