servicelog.java

First of all, the Applet-phone is a SIP User-Agent with audio and text messaging capabilities. But

/*
 * ServiceLog.java
 *
 * Created on September 17, 2003, 11:45 AM
 */

package gov.nist.security.log;

import java.io.*;

/**
 * This class is used to log all the output  (i.e. all the 'System.out.printXXX()') 
 * of the user's service to a file. Actually, We start the user's service in a
 * new Process, so we have to get the output of this process. If we don't, the Process
 * will be blocked until the output is read...
 * @author  DERUELLE Jean
 */
public class ServiceLog implements Runnable {
    /**the log thread*/
    private Thread logThread = null;
    /**process from which we will get the output */
    private Process process=null;
    /**the log file name and path where we will store the output*/
    private String logPath=null;
    
    /** 
     * Creates a new instance of ServiceLog
     * @param process - process from which we will get the output 
     * @param logPath - the log file name and path where we will store the output
     */
    public ServiceLog(Process process, String logPath) {
        this.process=process;
        this.logPath=logPath;
    }
    /**
     * start the logging thread
     */
    public void start() {
        if (logThread == null) {
            logThread = new Thread(this);
            logThread.start();
        }
    }
    
    /**
     * @see java.lang.Runnable#run()
     */
    public void run() { 
        //Open the stream to write the output of the user's service to a file
        FileOutputStream fileOutputStream=null;
        try{
            fileOutputStream=new FileOutputStream(logPath);            
        }
        catch(FileNotFoundException fnfe){
            fnfe.printStackTrace();
        }
        int exitValue=-1;        
        while(exitValue==-1){            
            // read the command output                
            try{                
                //read the user's service output (i.e. all the 'System.out.printXXX()')
                //we need to read it like that because the readline method will blocked
                //the thread until a complete line is in the buffer.
                byte[] inputBuf = new byte[process.getInputStream().available()];
                process.getInputStream().read(inputBuf, 0, inputBuf.length);
                //read the user's service error output (i.e. all the 'System.err.printXXX()')
                //we need to read it like that because the readline method will blocked
                //the thread until a complete line is in the buffer.                
                byte[] errorBuf = new byte[process.getErrorStream().available()];
                process.getErrorStream().read(errorBuf, 0, errorBuf.length);
                //Write the user's service output and error output to the log file
                //if we succeeded to open the file
                if(fileOutputStream!=null){
                    fileOutputStream.write(inputBuf, 0, inputBuf.length);
                    fileOutputStream.flush();
                    fileOutputStream.write(errorBuf, 0, errorBuf.length);
                    fileOutputStream.flush();
                }
                //or else on the standard output
                else{
                    System.out.write(inputBuf, 0, inputBuf.length);
                    System.out.write(errorBuf, 0, errorBuf.length);
                }
                //We look if the process is terminated
                //we stop the thread
                try{                        
                    exitValue=process.exitValue();                                                
                }
                catch (IllegalThreadStateException itse) {                    
                }                
            }
            catch(IOException ioe){
                ioe.printStackTrace();
            }    
            try{
                logThread.sleep(0,1);
            }
            catch(InterruptedException ie){
                ie.printStackTrace();
            }
        }           
    }
    
}