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FinalizeTracker.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.*;
import java.lang.reflect.Field;
@BTrace public class FinalizeTracker {
private static Field fdField =
field("java.io.FileInputStream", "fd");
@OnTimer(4000)
public static void ontimer() {
runFinalization();
}
@OnMethod(
clazz="java.io.FileInputStream",
method="finalize"
)
public static void onfinalize(@Self Object me) {
println(concat("finalizing ", str(me)));
printFields(me);
printFields(get(fdField, me));
println("==========");
}
@OnMethod(
clazz="java.io.FileInputStream",
method="close"
)
public static void onclose(@Self Object me) {
println(concat("closing ", str(me)));
println(concat("thread: ", str(currentThread())));
printFields(me);
printFields(get(fdField, me));
jstack();
println("=============");
}
}