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Glassfish example source code file (ThreadMonitor.java)

This example Glassfish source code file (ThreadMonitor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Glassfish tags/keywords

biginteger, biginteger, exception, management, math, na, object, reflection, string, string, stringbuilder, stringbuilder, stringbuildernewlineappender, threadinfo, threadinfo, threadmonitor, threadmxbean, util

The Glassfish ThreadMonitor.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

/*
 * ThreadMonitor.java
 *
 * Created on July 21, 2005, 11:50 AM
 */

package com.sun.enterprise.v3.admin.commands;

import com.sun.enterprise.util.i18n.StringManager;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.lang.reflect.Method;
import java.math.BigInteger;
import java.util.Arrays;
import javax.management.MBeanServerConnection;

/**
 */
class ThreadMonitor {
    
    private final MBeanServerConnection mbsc;
    private final StringManager sm = StringManager.getManager(ThreadMonitor.class);
    private static final BigInteger S2NANOS = new BigInteger("" + 1000000000);
    public ThreadMonitor(final MBeanServerConnection mbsc) {
        this.mbsc = mbsc;
    }
    public final String getThreadDump() {
        //final long start = System.currentTimeMillis();
        final StringBuilder sb = new StringBuilder();
        final StringBuilderNewLineAppender td = new StringBuilderNewLineAppender(sb);
        try {
            final ThreadMXBean tmx = ManagementFactory.newPlatformMXBeanProxy(mbsc, ManagementFactory.THREAD_MXBEAN_NAME, ThreadMXBean.class);
            final String title = getTitle();
            td.append(title); 
            td.append(sm.getString("thread.no", tmx.getThreadCount()));
            td.append(sm.getString("daemon.thread.no", tmx.getDaemonThreadCount()));
            td.append(sm.getString("peak.thread.no", tmx.getPeakThreadCount()));
            boolean tc = (tmx.isThreadContentionMonitoringSupported()) ? true : false;
            td.append(sm.getString("thread.contention.monitoring.supported", tc));
            boolean tce = (tmx.isThreadContentionMonitoringEnabled()) ? true : false;
            td.append(sm.getString("thread.contention.monitoring.enabled", tce));
            boolean cputs = (tmx.isThreadCpuTimeSupported()) ? true : false;
            td.append(sm.getString("thread.cputime.supported", cputs));
            boolean cpute = (tmx.isThreadCpuTimeEnabled()) ? true : false;
            td.append(sm.getString("thread.cputime.enabled", cpute));
            final long[] tids = tmx.getAllThreadIds();
            final ThreadInfo[] tinfos = tmx.getThreadInfo(tids, Integer.MAX_VALUE);
            /*
            Arrays.sort(tinfos, new Comparator<ThreadInfo> () {
                public int compare(ThreadInfo a, ThreadInfo b) {
                    return ( a.getThreadName().compareTo(b.getThreadName()) );
                }
            });
             */
            for (final ThreadInfo ti : tinfos) {
                td.append(dumpThread(tmx, ti));
            }
            sb.append(getDeadlockInfo(tmx));
            return ( td.toString() );
        } catch(final Exception e) {
            throw new RuntimeException(e);
        }
        /*finally {
            final long end = System.currentTimeMillis();
            final double time = (end/1000.0) - (start/1000.0);
            //logger.info("Time in seconds to get the jvm thread dump: " + time);
        }*/
    }
    private String dumpThread(ThreadMXBean tmx, ThreadInfo ti) {
        String msg = "--------------------------------------------------------------------------------";
        final StringBuilder sb = new StringBuilder(msg).append(StringBuilderNewLineAppender.SEP);
        sb.append(sm.getString("execution.info")).append(StringBuilderNewLineAppender.SEP);
        sb.append("-----------------------").append(StringBuilderNewLineAppender.SEP);
        final long ids = ti.getThreadId();
        final String ss  = ti.getThreadState().toString();        
        msg = sm.getString("thread.title", quote(ti.getThreadName()), ids, ss);
        sb.append(msg);
        if (ti.getLockName() != null) {
            msg = sm.getString("thread.waiting.on", ti.getLockName());
            sb.append(" " + msg);
        }
        if (ti.isSuspended()) {
            msg = sm.getString("thread.suspended");
            sb.append(" " + msg);
        }
        if (ti.isInNative()) {
            msg = sm.getString("thread.in.native");
            sb.append(" " + msg);
        }
        sb.append(StringBuilderNewLineAppender.SEP);
        for (final StackTraceElement ste : ti.getStackTrace()) {
            msg = sm.getString("thread.stack.element", ste.toString());
            sb.append(msg);
            sb.append(StringBuilderNewLineAppender.SEP);
        }
        msg = sm.getString("sync.info");
        sb.append(msg).append(StringBuilderNewLineAppender.SEP);
        sb.append("-----------------------").append(StringBuilderNewLineAppender.SEP);
        if (ti.getLockOwnerName() != null) {
            msg = sm.getString("lock.owner.details", ti.getLockOwnerName(), ti.getLockOwnerId());
            sb.append(msg).append(StringBuilderNewLineAppender.SEP);
        }
        msg = sm.getString("thread.blocked.times", ti.getBlockedCount());
        sb.append(msg).append(StringBuilderNewLineAppender.SEP);
        long bt = ti.getBlockedTime();
        if (bt != -1) { //if bt == -1 thread contention monitoring is not enabled, reported above
            msg = sm.getString("thread.blocked.totaltime", bt);
            sb.append(msg).append(StringBuilderNewLineAppender.SEP);
        }
        long wt = ti.getWaitedCount();
        msg = sm.getString("wait.times", wt);
        sb.append(msg).append(StringBuilderNewLineAppender.SEP);
        boolean tcput = tmx.isThreadCpuTimeEnabled() ? true : false;
        if (tcput) {
            long cput = tmx.getThreadCpuTime(ti.getThreadId());
            if (cput != -1) {
                BigInteger[] times = new BigInteger(cput + "").divideAndRemainder(S2NANOS);
                msg = sm.getString("thread.total.cpu.time", times[0], times[1]);
                sb.append(msg).append(StringBuilderNewLineAppender.SEP);
            }
            long user = tmx.getThreadUserTime(ti.getThreadId());
            if (user != -1) {
                BigInteger[] times = new BigInteger(cput + "").divideAndRemainder(S2NANOS);
                msg = sm.getString("thread.cpu.user.time", times[0], times[1]);
                sb.append(msg).append(StringBuilderNewLineAppender.SEP);
            }
        }      
        msg = sm.getString("lock.owner.details", ti.getLockOwnerName(), ti.getLockOwnerId());
        msg = getMoreThreadInfo(ti, "getLockedMonitors");
        sb.append(sm.getString("monitor.info", msg)).append(StringBuilderNewLineAppender.SEP);
        msg = getMoreThreadInfo(ti, "getLockedSynchronizers");
        sb.append(sm.getString("ownable.sync.info", msg));
        return ( sb.toString() );
    }
    
    private String getTitle() throws Exception {
        final RuntimeMXBean rt  = ManagementFactory.newPlatformMXBeanProxy(mbsc, ManagementFactory.RUNTIME_MXBEAN_NAME, RuntimeMXBean.class);
        final String vmname     = rt.getVmName();
        final String vmversion  = rt.getVmVersion();
        final String vmvendor   = rt.getVmVendor();
        final String title      = sm.getString("td.title", vmname, vmversion, vmvendor);
        
        return ( title );
    }
    
    private String quote(final String uq) {
        final StringBuilder sb = new StringBuilder("\"");
        sb.append(uq).append("\"");
        return ( sb.toString() );
    }
    
    private String getDeadlockInfo(final ThreadMXBean tmx) {
        final StringBuilderNewLineAppender sb = new StringBuilderNewLineAppender(new StringBuilder());
        final long[] dts = tmx.findMonitorDeadlockedThreads();
        if (dts == null) {
            sb.append(sm.getString("no.deadlock"));
        }
        else {
            sb.append(sm.getString("deadlocks.found"));
            for (final long dt : dts) {
                final ThreadInfo ti = tmx.getThreadInfo(dt);
                sb.append(this.dumpThread(tmx, ti));
            }
        }
        return ( sb.toString() );
    }
    
    private String getMoreThreadInfo(ThreadInfo ti, String mn) {
        String ms = "";
        try {
            Method glmm = ti.getClass().getDeclaredMethod(mn, (Class[])null);
            if (glmm != null) {
                Object monitors = glmm.invoke(ti, (Object[])null);
                if (monitors instanceof Object[]) {
                    return ( Arrays.toString((Object[])monitors) );
                } else {
                    return (NA);
                }
            } else {
                return (NA);
            }
        } catch(Exception e) {
            return (NA);
        }
    }
    
    public static final String NA = "NOT_AVAILABLE";
}

Other Glassfish examples (source code examples)

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