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BTrace: A safe, dynamic tracing tool for the Java platform

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/*
 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the Classpath exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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import org.openjdk.btrace.core.annotations.BTrace;
import org.openjdk.btrace.core.annotations.OnTimer;

import static org.openjdk.btrace.core.BTraceUtils.*;

/**
 * Demonstrates multiple timer probes with different periods to fire.
 */
@BTrace
public class Timers {

    // when starting print the target VM version and start time
    static {
        println("vm version " + Sys.VM.vmVersion());
        println("vm starttime " + Sys.VM.vmStartTime());
    }

    @OnTimer(1000)
    public static void f() {
        println("1000 msec: " + Sys.VM.vmUptime());
    }

    @OnTimer(3000)
    public static void f1() {
        println("3000 msec: " + Time.millis());
    }

}