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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
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 * 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.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 *
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 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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 * elects to include this software in this distribution under the [CDDL or GPL
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package com.sun.enterprise.universal.process;

import com.sun.enterprise.universal.io.SmartFile;
import com.sun.enterprise.util.OS;
import java.io.*;
import java.util.*;

/**
 * Run a native process with jps
 * -- get the pid for a running JVM
 * note:  dropping in an implementation for jps is not hard.
 * @author bnevins
 */
public class Jps {

    /**
     * return the platform-specific process-id of a JVM
     * @param mainClassName The main class - this is how we identify the right JVM
     * @return the process id if possible otherwise 0
     */
    final static public int getPid(String mainClassName) {
        Jps jps = new Jps();
        Integer integer = jps.pidMap.get(mainClassName);

        if(integer == null)
            return 0;

        return integer;
    }
    /**
     * Is this pid owned by a process?
     * @param apid the pid of interest
     * @return whether there is a process running with that id
     */
    final static public boolean isPid(int apid) {
        return new Jps().pidMap.containsValue(apid);
    }
    
    private Jps(){
        try {
            if(jpsExe == null)
                return;

            ProcessBuilder pb = new ProcessBuilder(jpsExe.getPath());
            Process p = pb.start();
            ProcessStreamDrainer saver = ProcessStreamDrainer.save("jps", p);
            saver.waitFor();
            String jpsOutput = saver.getOutString();
            // get each line
            String[] ss = jpsOutput.split("[\n\r]");

            for(String line : ss) {
                if(line == null || line.length() <= 0)
                    continue;

                String[] sublines = line.split(" ");
                if(sublines == null || sublines.length != 2)
                    continue;

                int aPid = 0;
                try {
                    aPid = Integer.parseInt(sublines[0]);
                }
                catch(Exception e) {
                    continue;
                }
                // todo -- handle duplicate names??
                pidMap.put(sublines[1], aPid);
            }
        }
        catch(Exception e) {
        }
    }

    private Map pidMap = new  HashMap();
    private static final File jpsExe;
    private static final String jpsName;

    static{
        if(OS.isWindows())
            jpsName = "jps.exe";
        else
            jpsName = "jps";

        final String    javaroot    = System.getProperty("java.home");
        final String    relpath     = "/bin/" + jpsName;
        final File      fhere       = new File(javaroot + relpath);
        File            fthere      = new File(javaroot + "/.." + relpath);

        if(fhere.isFile())
            jpsExe = SmartFile.sanitize(fhere);
        else if(fthere.isFile())
            jpsExe = SmartFile.sanitize(fthere);
        else
            jpsExe = null;
    }
}