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package com.sun.enterprise.cli.commands;

import com.sun.enterprise.util.io.StreamFlusher;
import com.sun.enterprise.util.OS;
import java.io.File;

/**
 *  CLIProcessExecutor
 *  A simple process executor class that is used by CLI.
 *  @author  jane.young@sun.com
 *  @version  $Revision: 1.6 $
 */
public class CLIProcessExecutor
{
    Process process;

    public CLIProcessExecutor() {
        process = null;
    }
    

    /**
     * This method invokes the runtime exec
     * @param cmd the command to execute
     * @param wait if true, wait for process to end.
     * @exception Exception
     */
    public void execute(String[] cmd, boolean wait) throws Exception
    {
        process=Runtime.getRuntime().exec(cmd);
            //process = new ProcessBuilder(cmd).start();
            
        // start stream flusher to push output to parent streams and null.
        StreamFlusher sfErr=new StreamFlusher(process.getErrorStream(), System.err, null);
        sfErr.start();

        // set flusher on stdout also, if not could stop with too much output
        StreamFlusher sfOut=new StreamFlusher(process.getInputStream(), System.out);
        sfOut.start();
        try {
            // must sleep for a couple of seconds, so if there is a jvm startup error,
            //the parent process
            //is around to catch and report it when the process in executed in verbose mode.
            Thread.currentThread().sleep(5000);
            //wait is not required for command like start database
            //where the process does not return since start database
            //spawn it's own process.
            if (wait) {
                process.waitFor();
            }
        }
        catch (InterruptedException ie) {
        }
    }

   /**
      return the exit value of this process.
      if process is null, then there is no process running
      therefore the return value is 0.
    */
    public int exitValue() {
        if (process == null) return -1;
        return process.exitValue();
    }

}