Examples of java.util.logging.Handler

java.util.logging.Handler
A Handler object takes log messages from a Logger and exports them. It might for example, write them to a console or write them to a file, or send them to a network logging service, or forward them to an OS log, or whatever.
A Handler can be disabled by doing a setLevel(Level.OFF) and can be re-enabled by doing a setLevel with an appropriate level.
Handler classes typically use LogManager properties to set default values for the Handler's Filter, Formatter, and Level. See the specific documentation for each concrete Handler class. @version 1.21, 04/07/06 @since 1.4

     */
    protected Logger getLogger() {
      if ( (m_Logger == null) && (!m_LoggerInitFailed) ) {
  if (m_Filename != null) {
    m_Logger = Logger.getLogger(m_Filename);
    Handler fh = null;
    try{       
      fh = new FileHandler(m_Filename, m_Size, m_NumFiles);
      fh.setFormatter(new SimpleFormatter());
      m_Logger.addHandler(fh);      
      m_LoggerInitFailed = false;
    }
    catch(Exception e) {
      System.out.println("Cannot init fileHandler for logger:" + e.toString());

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  protected Radio(String argsString[])
  {
    // Handler zuerst sowohl f�r Kommandozeilen- als auch
    // f�r GUI-Bedienung aktivieren, damit man alle Fehler
    // w�hrend dem Starten sieht
    Handler logHandler = new ConsoleLogHandler();
    logHandler.setFilter(this);
    logHandler.setFormatter(new LogFormatter());
    Logger.getLogger().addHandler(logHandler);
    
    // Parameter in einen Vektor kopieren
    Vector args = new Vector();
    
    for (int i=0; i < argsString.length; i++)
    {
      args.add(argsString[i]);
    }
    
    // Debug-Nachrichten anzeigen?
    displayDebugMessages = parseBooleanArg(args, "debug", false); //$NON-NLS-1$
    
    // Keine grafische Oberfl�che?
    boolean noGUI = parseBooleanArg(args, "nogui", false); //$NON-NLS-1$
    
    boolean consoleUI = parseBooleanArg(args, "consoleui", false); //$NON-NLS-1$
    
    // Keine grafische Oberfl�che bei Konsolenbedienung anzeigen
    if (consoleUI)
    {
      noGUI = true;
    }
    
    // Portnummern lesen
    int port = -1;
    boolean portSet = false;
    
    try
    {
      port = parseIntArg(args, "port", port); //$NON-NLS-1$
      portSet = (port != -1);
    }
    catch (IllegalArgumentException e)
    {
      exit(Messages.getString("Radio.INVALID_PORT_NUMBER"), noGUI); //$NON-NLS-1$
    }
    
    // Maximale Bandbreite lesen
    int maxUploadBandwidth = 0;
    boolean maxUploadBandwidthSet = false;
      
    try
    {
      maxUploadBandwidth = parseIntArg(args, "maxbandwidth", maxUploadBandwidth); //$NON-NLS-1$
      maxUploadBandwidthSet = (maxUploadBandwidth != 0);
    }
    catch (IllegalArgumentException e)
    {
      exit(Messages.getString("Radio.INVALID_BANDWIDTH_LIMIT"), noGUI); //$NON-NLS-1$
    }
    
    // Logdatei gew�nscht?
    String logFileName = null;
    logFileName = parseStringArg(args, "logfile", null); //$NON-NLS-1$
    if (logFileName != null)
    {
      try
      {
        Handler logfileHandler = new FileLogHandler(logFileName);
        logfileHandler.setFilter(this);
        logfileHandler.setFormatter(new LogFormatter());
        Logger.getLogger().addHandler(logfileHandler);
      }
      catch (IOException e)
      {
        exit(Messages.getString("Radio.INVALID_LOGFILE_NAME"), noGUI); //$NON-NLS-1$

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    catch (Exception e)
    {
      Logger.severe("MainFrame", "INTERNAL_ERROR", e); //$NON-NLS-1$ //$NON-NLS-2$
    }
    
    Handler logHandler = new GUILogHandler(messages);
    logHandler.setFilter(this);
    logHandler.setFormatter(new LogFormatter());
    Logger.getLogger().addHandler(logHandler);
  }

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   */
  public void apply(){
    LogManager lm=LogManager.getLogManager();
        if(lowestLevel != null){
            for(Iterator handlerIterator = outHandlerList.iterator(); handlerIterator.hasNext();){
                Handler outHandler = (Handler) handlerIterator.next();
                outHandler.setLevel(lowestLevel);
            }
        }
    Enumeration e=lm.getLoggerNames();
    while(e.hasMoreElements()){
      Logger l=lm.getLogger((String)e.nextElement());

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    for(int i=0;i<prefixes.size();i++){
      if(logger.getName().startsWith((String)prefixes.get(i)) || (logger.getName().equals("") && prefixes.get(i).equals(ROOT_LOGGER_PREFIX))){
        // remove silently the outHandler
        // in case it was already set
              for(Iterator handlerIterator = outHandlerList.iterator(); handlerIterator.hasNext();){
                  Handler outHandler = (Handler) handlerIterator.next();
                  logger.removeHandler(outHandler);


                  logger.addHandler(outHandler);
              }
        // TODO add property to configure that

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    } catch (ClassNotFoundException e) {
      System.err.println("Unknown logging format class : "+loggingFormat);
    }
    if(format!=null){
        for(Iterator handlerIterator = outHandlerList.iterator(); handlerIterator.hasNext();){
                Handler outHandler = (Handler) handlerIterator.next();
                outHandler.setFormatter(format);
            }
    }


    configureLevels();
  }

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                     BundleUtils.getBundleName(LogUtilsTest.class),
                     LOG.getResourceBundleName());
    }


    public void testHandleL7dMessage() throws Exception {
        Handler handler = EasyMock.createNiceMock(Handler.class);
        LOG.addHandler(handler);
        // handler called *before* localization of message
        LogRecord record = new LogRecord(Level.WARNING, "FOOBAR_MSG");
        EasyMock.reportMatcher(new LogRecordMatcher(record));
        handler.publish(record);
        EasyMock.replay(handler);
        LOG.log(Level.WARNING, "FOOBAR_MSG");
        EasyMock.verify(handler);
    }

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        LOG.log(Level.WARNING, "FOOBAR_MSG");
        EasyMock.verify(handler);
    }


    public void testLogParamSubstitutionWithThrowable() throws Exception {
        Handler handler = EasyMock.createNiceMock(Handler.class);
        LOG.addHandler(handler);
        // handler called *after* localization of message
        Exception ex = new Exception();
        LogRecord record = new LogRecord(Level.SEVERE, "subbed in 1 only");
        record.setThrown(ex);
        EasyMock.reportMatcher(new LogRecordMatcher(record));
        handler.publish(record);
        EasyMock.replay(handler);
        LogUtils.log(LOG, Level.SEVERE, "SUB1_MSG", ex, 1);
        EasyMock.verify(handler);
    }

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        LogUtils.log(LOG, Level.SEVERE, "SUB1_MSG", ex, 1);
        EasyMock.verify(handler);
    }


    public void testLogParamsSubstitutionWithThrowable() throws Exception {
        Handler handler = EasyMock.createNiceMock(Handler.class);
        LOG.addHandler(handler);
        // handler called *after* localization of message
        Exception ex = new Exception();
        LogRecord record = new LogRecord(Level.SEVERE, "subbed in 4 & 3");
        record.setThrown(ex);
        EasyMock.reportMatcher(new LogRecordMatcher(record));
        handler.publish(record);
        EasyMock.replay(handler);
        LogUtils.log(LOG, Level.SEVERE, "SUB2_MSG", ex, new Object[] {3, 4});
        EasyMock.verify(handler);
    }

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     */
    protected boolean processParsedOptions(boolean parseOk) {
        if (parseOk) {
            if (logOpt.isSet()) {
                Level level = Level.parse(logOpt.getValue());
                Handler h = new StreamHandler(stream, logFormatter);
                h.setLevel(level);
                Logger rootLogger = Logger.getLogger("");
                rootLogger.addHandler(h);
                rootLogger.setLevel(level);
            }
        }

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