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

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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.  Oracle designates this
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 * 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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import org.openjdk.btrace.core.annotations.BTrace;
import org.openjdk.btrace.core.annotations.OnMethod;
import org.openjdk.btrace.core.annotations.ProbeClassName;
import org.openjdk.btrace.core.annotations.ProbeMethodName;

import static org.openjdk.btrace.core.BTraceUtils.print;
import static org.openjdk.btrace.core.BTraceUtils.println;

/**
 * A simple example that demonstrates subtype matching by +foo pattern
 * in "clazz" attribute of @OnMethod annotation.
 */
@BTrace
public class SubtypeTracer {
    @OnMethod(
            clazz = "+java.lang.Runnable",
            method = "run"
    )
    public static void onRun(@ProbeClassName String pcn, @ProbeMethodName String pmn) {
        // on every Runnable.run() method entry print class.method
        print(pcn);
        print('.');
        println(pmn);
    }
}