Examples of sun.misc.Perf$GetPerfAction

sun.misc.Perf

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. @see java.security.AccessController#doPrivileged(PrivilegedAction) @see java.lang.RuntimePermission

     *
     * @throws  IOException     An I/O error occurred while trying to acquire
     *                          the instrumentation buffer.
     */
    public static String importFrom(int vmid) throws IOException {
        Perf perf = Perf.getPerf();
        ByteBuffer bb;
        try {
            bb = perf.attach(vmid, "r");
        } catch (IllegalArgumentException iae) {
            throw new IOException(iae.getMessage());
        }
        List counters = (new PerfInstrumentation(bb)).findByPattern(CONNECTOR_ADDRESS_COUNTER);
        Iterator i = counters.iterator();

Related Classes of sun.misc.Perf$GetPerfAction

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