/* * Copyright 1999-2005 The Apache Software Foundation. *  * 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 *  *      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);}