package com.sun.btrace.samples; import com.sun.btrace.annotations.*; import static com.sun.btrace.BTraceUtils.*; import com.sun.btrace.annotations.Export; /**
 * This sample creates a jvmstat counter and
 * increments it everytime Thread.start() is
 * called. This thread count may be accessed
 * from outside the process. The @Export annotated
 * fields are mapped to jvmstat counters. The counter
 * name is "btrace." ++ "." +*/ @BTrace public class ThreadCounter { // create a jvmstat counter using @Export @Export private static long count; @OnMethod(
        clazz="java.lang.Thread",
        method="start" ) public static void onnewThread(@Self Thread t) { // updating counter is easy. Just assign to // the static field! count++;
    } @OnTimer(2000) public static void ontimer() { // we can access counter as "count" as well // as from jvmstat counter directly. println(count); // or equivalently ... println(Counters.perfLong("btrace.com.sun.btrace.samples.ThreadCounter.count"));
    }
}

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