How to use

ErrorHandler

in

org.apache.logging.log4j.core

protected RocketmqLog4j2Appender(String name, Filter filter, Layout<? extends Serializable> layout,
  boolean ignoreExceptions, String nameServerAddress, String producerGroup,
  String topic, String tag) {
  super(name, filter, layout, ignoreExceptions);
  this.producer = producer;
  this.topic = topic;
  this.tag = tag;
  this.nameServerAddress = nameServerAddress;
  this.producerGroup = producerGroup;
  try {
    this.producer = ProducerInstance.getProducerInstance().getInstance(this.nameServerAddress, this.producerGroup);
  } catch (Exception e) {
    ErrorHandler handler = this.getHandler();
    if (handler != null) {
      handler.error("Starting RocketmqLog4j2Appender [" + this.getName()
        + "] nameServerAddress:" + nameServerAddress + " group:" + producerGroup + " " + e.getMessage());
    }
  }
}

/**
 * Info,error,warn,callback method implementation
 */
public void append(LogEvent event) {
  if (null == producer) {
    return;
  }
  byte[] data = this.getLayout().toByteArray(event);
  try {
    Message msg = new Message(topic, tag, data);
    msg.getProperties().put(ProducerInstance.APPENDER_TYPE, ProducerInstance.LOG4J2_APPENDER);
    //Send message and do not wait for the ack from the message broker.
    producer.sendOneway(msg);
  } catch (Exception e) {
    ErrorHandler handler = this.getHandler();
    if (handler != null) {
      String msg = new String(data);
      handler.error("Could not send message in RocketmqLog4j2Appender [" + this.getName() + "].Message is : " + msg, e);
    }
  }
}

/**
 * When system exit,this method will be called to close resources
 */
public boolean stop(long timeout, TimeUnit timeUnit) {
  this.setStopping();
  try {
    ProducerInstance.getProducerInstance().removeAndClose(this.nameServerAddress, this.producerGroup);
  } catch (Exception e) {
    ErrorHandler handler = this.getHandler();
    if (handler != null) {
      handler.error("Closeing RocketmqLog4j2Appender [" + this.getName()
        + "] nameServerAddress:" + nameServerAddress + " group:" + producerGroup + " " + e.getMessage());
    }
  }
  boolean stopped = super.stop(timeout, timeUnit, false);
  this.setStopped();
  return stopped;
}

protected RocketmqLog4j2Appender(String name, Filter filter, Layout<? extends Serializable> layout,
  boolean ignoreExceptions, String nameServerAddress, String producerGroup,
  String topic, String tag) {
  super(name, filter, layout, ignoreExceptions);
  this.producer = producer;
  this.topic = topic;
  this.tag = tag;
  this.nameServerAddress = nameServerAddress;
  this.producerGroup = producerGroup;
  try {
    this.producer = ProducerInstance.getProducerInstance().getInstance(this.nameServerAddress, this.producerGroup);
  } catch (Exception e) {
    ErrorHandler handler = this.getHandler();
    if (handler != null) {
      handler.error("Starting RocketmqLog4j2Appender [" + this.getName()
        + "] nameServerAddress:" + nameServerAddress + " group:" + producerGroup + " " + e.getMessage());
    }
  }
}

/**
 * Info,error,warn,callback method implementation
 */
public void append(LogEvent event) {
  if (null == producer) {
    return;
  }
  byte[] data = this.getLayout().toByteArray(event);
  try {
    Message msg = new Message(topic, tag, data);
    msg.getProperties().put(ProducerInstance.APPENDER_TYPE, ProducerInstance.LOG4J2_APPENDER);
    //Send message and do not wait for the ack from the message broker.
    producer.sendOneway(msg);
  } catch (Exception e) {
    ErrorHandler handler = this.getHandler();
    if (handler != null) {
      String msg = new String(data);
      handler.error("Could not send message in RocketmqLog4j2Appender [" + this.getName() + "].Message is : " + msg, e);
    }
  }
}

/**
 * When system exit,this method will be called to close resources
 */
public boolean stop(long timeout, TimeUnit timeUnit) {
  this.setStopping();
  try {
    ProducerInstance.getProducerInstance().removeAndClose(this.nameServerAddress, this.producerGroup);
  } catch (Exception e) {
    ErrorHandler handler = this.getHandler();
    if (handler != null) {
      handler.error("Closeing RocketmqLog4j2Appender [" + this.getName()
        + "] nameServerAddress:" + nameServerAddress + " group:" + producerGroup + " " + e.getMessage());
    }
  }
  boolean stopped = super.stop(timeout, timeUnit, false);
  this.setStopped();
  return stopped;
}

/**
 * Handle an error with a message using the {@link ErrorHandler} configured for this Appender.
 * 
 * @param msg The message.
 */
public void error(final String msg) {
  handler.error(msg);
}

/**
 * Handle an error with a message, exception, and a logging event, using the {@link ErrorHandler} configured for
 * this Appender.
 * 
 * @param msg The message.
 * @param event The LogEvent.
 * @param t The Throwable.
 */
public void error(final String msg, final LogEvent event, final Throwable t) {
  handler.error(msg, event, t);
}

/**
 * Handle an error with a message and an exception using the {@link ErrorHandler} configured for this Appender.
 * 
 * @param msg The message.
 * @param t The Throwable.
 */
public void error(final String msg, final Throwable t) {
  handler.error(msg, t);
}

private String appenderErrorHandlerMessage(final String prefix) {
  final String result = createErrorMsg(prefix);
  appender.getHandler().error(result);
  return result;
}

private synchronized void changeState(State initialState, State transitionState, State finalState, Runnable body) {
  logger.debug("expecting state: %s", initialState);
  if (initialState != state) {
    String message = String.format("expecting: %s, found: %s", initialState, state);
    errorHandler.error(message);
    throw new IllegalStateException(message);
  }
  logger.debug("transitioning state: %s", transitionState);
  state = transitionState;
  try {
    if (body != null) {
      body.run();
    }
    logger.debug("finalizing state: %s", finalState);
    state = finalState;
  } catch (Exception error) {
    String message = String.format(
        "state change failure (initialState=%s, transitionState=%s, finalState=%s)",
        initialState, transitionState, finalState);
    if (debugEnabled) {
      logger.debug("%s: %s", message, error.getMessage());
      error.printStackTrace();
    }
    errorHandler.error(message, error);
    throw new RuntimeException(message, error);
  }
}

private void handleAppenderError(final RuntimeException ex) {
  appender.getHandler().error(createErrorMsg("An exception occurred processing Appender "), ex);
  if (!appender.ignoreExceptions()) {
    throw ex;
  }
}

  getHandler().error("Could not send log message " + logEvent.getMessage()
      + " after " + this.manager.maxSenderRetries + " retries", logEvent, e);
getHandler().error("Could not send log message " + logEvent.getMessage(), logEvent, e);

  getHandler().error("Could not send log message " + logEvent.getMessage()
      + " after " + this.manager.maxSenderRetries + " retries", logEvent, e);
getHandler().error("Could not send log message " + logEvent.getMessage(), logEvent, e);

/** 
 * {@inheritDoc}
 */
public void append(LogEvent event) {
  if (_handle == null) {
    registerEventSource();
  }
  String s = new String(getLayout().toByteArray(event));
  final int messageID = 0x1000;
  String[] buffer = { s };
  if (Advapi32.INSTANCE.ReportEvent(_handle, getEventLogType(event.getLevel()),
      getEventLogCategory(event.getLevel()), messageID, null, buffer.length, 0, buffer, null) == false) {
    Exception e = new Win32Exception(Kernel32.INSTANCE.GetLastError());
    getHandler().error("Failed to report event [" + s + "].", event, e);
  }
}