001/*
002 * (C) Copyright 2011-2016 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     matic
018 */
019package org.nuxeo.runtime.management.jvm;
020
021import java.io.File;
022import java.io.IOException;
023import java.lang.management.ManagementFactory;
024
025import javax.management.MBeanServer;
026
027import org.nuxeo.runtime.api.Framework;
028
029import com.sun.management.HotSpotDiagnosticMXBean;
030
031/**
032 * Helper to dump the heap in a temporary file.
033 *
034 * @author matic
035 * @since 5.5
036 */
037public class HeapDumper {
038
039    private static final String HOTSPOT_NAME = "com.sun.management:type=HotSpotDiagnostic";
040
041    public HeapDumper() throws IOException {
042    }
043
044    protected final HotSpotDiagnosticMXBean diag = newDiag();
045
046    protected HotSpotDiagnosticMXBean newDiag() throws IOException {
047        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
048        return ManagementFactory.newPlatformMXBeanProxy(mbs, HOTSPOT_NAME, HotSpotDiagnosticMXBean.class);
049    }
050
051    /**
052     * Dumps heap in a temporary file and returns the file
053     *
054     * @since 5.5
055     * @throws IOException
056     */
057    public File dumpHeap() throws IOException {
058        File file = Framework.createTempFile("heapdump", ".hprof");
059        file.delete();
060        newDiag().dumpHeap(file.getAbsolutePath(), true);
061        return file;
062    }
063
064}