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BTrace: A safe, dynamic tracing tool for the Java platform
There is a newer version: 2.2.5
/*
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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import org.openjdk.btrace.core.Profiler;
import org.openjdk.btrace.core.BTraceUtils;
import org.openjdk.btrace.core.annotations.BTrace;
import org.openjdk.btrace.core.annotations.Duration;
import org.openjdk.btrace.core.annotations.Kind;
import org.openjdk.btrace.core.annotations.Location;
import org.openjdk.btrace.core.annotations.OnMethod;
import org.openjdk.btrace.core.annotations.OnTimer;
import org.openjdk.btrace.core.annotations.ProbeMethodName;
import org.openjdk.btrace.core.annotations.Property;

/**
 * This script demonstrates new capabilities built into BTrace 1.2
 * 
 * Shortened syntax - when omitting "public" identifier in the class
 * definition one can safely omit all other modifiers when declaring methods
 * and variables
 * Extended syntax for @ProbeMethodName annotation - you can use
 * fqn parameter to request a fully qualified method name instead of
 * the short one
 * Profiling support - you can use {@linkplain Profiler} instance to gather
 * performance data with the smallest overhead possible
 * 
 *
 * @since 1.2
 */
@BTrace
class Profiling {
    @Property
    Profiler swingProfiler = BTraceUtils.Profiling.newProfiler();

    @OnMethod(clazz = "/javax\\.swing\\..*/", method = "/.*/")
    void entry(@ProbeMethodName(fqn = true) String probeMethod) {
        BTraceUtils.Profiling.recordEntry(swingProfiler, probeMethod);
    }

    @OnMethod(clazz = "/javax\\.swing\\..*/", method = "/.*/", location = @Location(value = Kind.RETURN))
    void exit(@ProbeMethodName(fqn = true) String probeMethod, @Duration long duration) {
        BTraceUtils.Profiling.recordExit(swingProfiler, probeMethod, duration);
    }

    @OnTimer(5000)
    void timer() {
        BTraceUtils.Profiling.printSnapshot("Swing performance profile", swingProfiler);
    }
}