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  * Copyright 2010 JBoss Inc
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.drools;

This interface is used to provide callback style logging for the system events.

The SystemEventListenerFactory is used to provide the default SystemEventListener to various Drools components such as the KnowledgeAgent, ResourceChangeNotifier and ResourceChangeListener. Although many of these components allow the used listener to be overriden with a setSystemEventListener(SystemEventListener) method.

public interface SystemEventListener {
For general info messages
    public void info(String message);
    public void info(String message,
                     Object object);

For a warning (useful when tracking down problems).
    public void warning(String message);
    public void warning(String message,
                        Object object);

An exception occurred.
    public void exception(String messageThrowable e);
    public void exception(Throwable e);

These should not be logged, just shown if needed.
    public void debug(String message);
    public void debug(String message,
                      Object object);
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