Examples of org.apache.log4j.spi.LoggingEvent

org.apache.log4j.spi.LoggingEvent
The internal representation of logging events. When an affirmative decision is made to log then a LoggingEvent instance is created. This instance is passed around to the different log4j components.
This class is of concern to those wishing to extend log4j.

Writers of log4j components such as appenders and receivers should be aware of that some of the LoggingEvent fields are initialized lazily. Therefore, an appender wishing to output data to be later correctly read by a receiver, must initialize "lazy" fields prior to writing them out. See the {@link #prepareForDeferredProcessing()} method for the exact list.
Moreover, in the absence of certain fields, receivers must set the values of null fields to a default non-null value. For example, in the absence of the locationInfo data, the locationInfo field should be set to {@link org.apache.log4j.spi.location.LocationInfo#NA_LOCATION_INFO LocationInfo.NA_LOCATION_INFO}. @author Ceki Gülcü @author James P. Cakalic

      final Appender forcedAppender = getForcedAppender();
      
      // force the logging and modify the log message (the latter might return the original message)
      if (forcedAppender!=null) {
        // only call the forced appender
        forcedAppender.doAppend(new LoggingEvent(FQCN, this, priority, modifyLogMessage(msg), t));
      } else {
        // go via the normal appenders
        forcedLog(FQCN, priority, modifyLogMessage(msg), t);
      }

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      final Appender forcedAppender = getForcedAppender();
      
      // force the logging and modify the log message (the latter might return the original message)
      if (forcedAppender!=null) {
        // only call the forced appender
        forcedAppender.doAppend(new LoggingEvent(FQCN, this, priority, modifyLogMessage(msg), t));
      } else {
        // go via the normal appenders
        forcedLog(FQCN, priority, modifyLogMessage(msg), t);
      }

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    try {
      StringBuilder buf = new StringBuilder();


      int len = cb.length();
      for (int i = 0; i < len; i++) {
        LoggingEvent event = cb.get();
        buf.append(layout.format(event));
        // if layout doesn't handle exception, the appender has to do it
        if (layout.ignoresThrowable()) {
          String[] s = event.getThrowableStrRep();
          if (s != null) {
            for (int j = 0; j < s.length; j++) {
              buf.append(Layout.LINE_SEP);
              buf.append(s[j]);
            }

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  /**
   * Tests format.
   */
  public void testFormat() {
    Logger logger = Logger.getLogger("org.apache.log4j.LayoutTest");
    LoggingEvent event =
      new LoggingEvent(
        "org.apache.log4j.Logger", logger, Level.INFO, "Hello, World", null);
    PatternLayout layout = (PatternLayout) createLayout();
    String result = layout.format(event);
    StringBuffer buf = new StringBuffer(100);
    buf.append('[');
    buf.append(event.getThreadName());
    buf.append("] ");
    buf.append(event.getLevel().toString());
    buf.append(' ');
    buf.append(event.getLoggerName());
    buf.append(" - ");
    buf.append(event.getMessage());
    buf.append(System.getProperty("line.separator"));
    assertEquals(buf.toString(), result);
  }

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    for (int i = 0; i < msg.length; i++) {
      msg[i] = 'A';
    }


    LoggingEvent event1 =
      new LoggingEvent(
        "org.apache.log4j.Logger", logger, Level.DEBUG, new String(msg), null);
    PatternLayout layout = (PatternLayout) createLayout();
    String result = layout.format(event1);
    LoggingEvent event2 =
      new LoggingEvent(
        "org.apache.log4j.Logger", logger, Level.WARN, "Hello, World", null);
    result = layout.format(event2);
    assertEquals("[", result.substring(0, 1));
  }

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   */
  public void testFormat() throws Exception {
    Logger logger = Logger.getLogger("org.apache.log4j.xml.HTMLLayoutTest");
    NDC.push("NDC goes here");


    LoggingEvent event =
      new LoggingEvent(
        "org.apache.log4j.Logger", logger, Level.INFO, "Hello, World", null);
    HTMLLayout layout = (HTMLLayout) createLayout();
    layout.setLocationInfo(true);


    String result = layout.format(event);

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    for (int i = 0; i < msg.length; i++) {
      msg[i] = 'A';
    }


    LoggingEvent event1 =
      new LoggingEvent(
        "org.apache.log4j.Logger", logger, Level.DEBUG, new String(msg), null);
    HTMLLayout layout = (HTMLLayout) createLayout();
    layout.setLocationInfo(true);


    String result = layout.format(event1);
    Exception ex = new IllegalArgumentException("'foo' is not a valid value.");
    LoggingEvent event2 =
      new LoggingEvent(
        "org.apache.log4j.Logger", logger, Level.WARN, "Hello, World", ex);
    result = layout.format(event2);
    assertEquals(
      Layout.LINE_SEP + "<tr>",
      result.substring(0, Layout.LINE_SEP.length() + 4));

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      Hashtable mdcMap = MDC.getContext();
      if (mdcMap != null) {
          mdcMap.clear();
      }
      MDC.put(problemName, problemName);
      LoggingEvent event =
        new LoggingEvent(
          problemName, logger, level, problemName, ex);
      HTMLLayout layout = (HTMLLayout) createLayout();
      String result = layout.format(event);
      mdcMap = MDC.getContext();
      if (mdcMap != null) {

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      root.trace("Discarded Message");
      root.trace("Discarded Message");


      Vector msgs = appender.getVector();
      assertEquals(1, msgs.size());
      LoggingEvent event = (LoggingEvent) msgs.elementAt(0);
      assertEquals(Level.TRACE, event.getLevel());
      assertEquals("Message 1", event.getMessage());
  }

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        root.trace("Discarded Message", ex);
        root.trace("Discarded Message", ex);


        Vector msgs = appender.getVector();
        assertEquals(1, msgs.size());
        LoggingEvent event = (LoggingEvent) msgs.elementAt(0);
        assertEquals(Level.TRACE, event.getLevel());
        assertEquals("Message 1", event.getMessage());
    }

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