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ThreadCounterBean.java
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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).
*
* 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,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.btrace.samples;
import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;
/**
* This sample demonstrates that you can expose a BTrace
* class as a JMX MBean. After connecting BTrace to the
* target application, connect VisualVM or jconsole or
* any other JMX client to the same application.
*/
@BTrace public class ThreadCounterBean {
// @Property makes the count field to be exposed
// as an attribute of this MBean.
@Property
private static long count;
@OnMethod(
clazz="java.lang.Thread",
method="start"
)
public static void onnewThread(@Self Thread t) {
count++;
}
@OnTimer(2000)
public static void ontimer() {
println(count);
}
}