/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.log4j.spi;

/**
   
   Implementions of this interface allow certain appenders to decide
   when to perform an appender specific action.

  <p>For example the {@link org.apache.log4j.net.SMTPAppender} sends
  an email when the {@link #isTriggeringEvent} method returns
  <code>true</code> and adds the event to an internal buffer when the
  returned result is <code>false</code>.

  @author Ceki G&uuml;lc&uuml;
  @since version 1.0
   
 */
public interface TriggeringEventEvaluator {
  
  /**
     Is this the triggering event?
   */
  public boolean isTriggeringEvent(LoggingEvent event);
}