Perf.GetPerfAction

Class Overview

The GetPerfAction class is a convenience class for acquiring access to the singleton Perf instance using the AccessController.doPrivileged() method.

An instance of this class can be used as the argument to AccessController.doPrivileged(PrivilegedAction).

Here is a suggested idiom for use of this class:

 class MyTrustedClass {
   private static final Perf perf =
       AccessController.doPrivileged(new Perf.GetPerfAction());
   ...
 }
 

In the presence of a security manager, the MyTrustedClass class in the above example will need to be granted the "sun.misc.Perf.getPerf" RuntimePermission permission in order to successfully acquire the singleton Perf instance.

Please note that the "sun.misc.Perf.getPerf" permission is not a JDK specified permission.

Summary

[Expand] Inherited Methods
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait() Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object. final void wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed. final void wait(long timeout) Causes the current thread to wait until either another thread invokes the notify() method or the notifyAll() method for this object, or a specified amount of time has elapsed.
From interface java.security.PrivilegedAction abstract T run() Performs the computation.