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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » sun.misc 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   sun.misc.VM

VM
public class VM implements Runnable(Code)
The Sun.misc.vm class provides an interface to the memory management system of the Virtual Machine so that applications and applets can be informed of the state of memory system. Memory States :
  • Green When the memory state is "Green", the vm has sufficient memory to run normally.
  • Yellow When the memory state is "Yellow", the vm still has sufficient memory to run, but large allocations may fail, so an application may wish to free unnecessary resources or make other space saving trade-offs.
  • Red When the memory state is Red, the vm is critically low on memory. All unnecessary memory should be freed and unnecessary applications should exit.

    These states are represented with the constants VM.STATE_GREEN, VM.STATE_YELLOW, and VM.STATE_RED.

    Compatibility

    Some PersonalJava implementations support the Sun.misc.vm class. It is not supported in the J2SE.


  • Field Summary
    final public static  intSTATE_GREEN
        
    final public static  intSTATE_RED
        
    final public static  intSTATE_YELLOW
        


    Method Summary
    final public static  intgetStateQuick()
         Report the (approximate) memory state at the end of the last GC.
    public static  voidregisterVMNotification(VMNotification n)
         Register a notifier to be informed when availability of memory in the system changes state.
    public  voidrun()
         User code is not meant to call this.

    Field Detail
    STATE_GREEN
    final public static int STATE_GREEN(Code)



    STATE_RED
    final public static int STATE_RED(Code)



    STATE_YELLOW
    final public static int STATE_YELLOW(Code)





    Method Detail
    getStateQuick
    final public static int getStateQuick()(Code)
    Report the (approximate) memory state at the end of the last GC. This will be a quick operation that should give a useful approximation of the real state of the system. the current memory state



    registerVMNotification
    public static void registerVMNotification(VMNotification n)(Code)
    Register a notifier to be informed when availability of memory in the system changes state.

    After calling the registerVMNotification() method, the notifier will be invoked when the specified changes in memory state occur.
    See Also:   sun.misc.VMNotification




    run
    public void run()(Code)
    User code is not meant to call this.



    Methods inherited from java.lang.Object
    public boolean equals(Object obj)(Code)(Java Doc)
    final native public Class getClass()(Code)(Java Doc)
    native public int hashCode()(Code)(Java Doc)
    final native public void notify()(Code)(Java Doc)
    final native public void notifyAll()(Code)(Java Doc)
    public String toString()(Code)(Java Doc)
    final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
    final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
    final public void wait() throws InterruptedException(Code)(Java Doc)

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