systemmonitor.java

pos机交易实现源代码 含金融卡交易8583协议实现 开发环境：linux 典型应用：嵌入系统开发 仅供参考

/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project 
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may 
 *    appear in the software itself, if and wherever such third-party 
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
 *    or promote products derived from this software without prior 
 *    written permission. For written permission, please contact 
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package org.jpos.util;

import java.io.*;
import java.util.*;

/**
 * Periodically dumps Thread and memory usage
 * @author [e-mail]
 * @version $Id: SystemMonitor.java,v 1.5 2001/11/02 15:11:09 apr Exp $
 * @see Logger
 */
public class SystemMonitor implements Runnable, LogSource, Loggeable
{
    private Logger logger = null;
    private String realm  = null;
    private int sleepTime = 0;
    private int delay     = 0;
    private Thread thread = null;

    /**
     * @param sleepTime sleep
     * @param logger current logger
     * @param realm  instance realm
     */
    public SystemMonitor (int sleepTime, Logger logger, String realm) {
	setLogger (logger, realm);
	this.sleepTime = sleepTime;
	startThread();
    }
    
    private void startThread() {
	if (thread != null)
	    thread.interrupt();
	else if (sleepTime > 0) {
	    thread = new Thread(this);
	    thread.setName ("SystemMonitor");
	    thread.setPriority (Thread.MIN_PRIORITY);
	    thread.start();
	}
    }

    /**
     * @param sleepTime new sleepTime;
     */
    public void setSleepTime (int sleepTime) {
	this.sleepTime = sleepTime;
	startThread();
    }

    void dumpThreads (ThreadGroup g, PrintStream p, String indent) {
	Thread[] list = new Thread[g.activeCount()+5];
	int nthreads = g.enumerate(list);
	for (int i=0; i<nthreads; i++) 
	    p.println (indent + list[i]);
    }

    public void showThreadGroup (ThreadGroup g, PrintStream p, String indent) {
	if (g.getParent() != null)
	    showThreadGroup (g.getParent(), p, indent + "  ");
	else
	    dumpThreads (g, p, indent + "    ");
    }

    public void run() {
	for (;;) {
            LogEvent evt = new LogEvent (this, "SystemMonitor", this);
            evt.addMessage (NameRegistrar.getInstance ());
	    Logger.log (evt);
	    try {
		long expected = System.currentTimeMillis() + sleepTime;
		Thread.sleep (sleepTime);
		delay = (int) (System.currentTimeMillis() - expected);
	    } catch (InterruptedException e) { }
	}
    }
    public void dump (PrintStream p, String indent) {
	String newIndent = indent + "  ";
	Runtime r = Runtime.getRuntime();
        p.println (indent + "<memory>");
	p.println (newIndent+" freeMemory="+r.freeMemory());
	p.println (newIndent+"totalMemory="+r.totalMemory());
	p.println (newIndent+"inUseMemory="+(r.totalMemory()-r.freeMemory()));
        p.println (indent + "</memory>");
        p.println (indent + "<threads>");
	p.println (newIndent+"      delay="+delay+" ms");
	p.println (newIndent+"    threads="+Thread.activeCount());
	showThreadGroup (Thread.currentThread().getThreadGroup(), p, newIndent);
        p.println (indent + "</threads>");
    }
    public void setLogger (Logger logger, String realm) {
	this.logger = logger;
	this.realm  = realm;
    }
    public String getRealm () {
	return realm;
    }
    public Logger getLogger() {
	return logger;
    }
}