001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.log4j.spi; 019 020/** 021 022 Implementions of this interface allow certain appenders to decide 023 when to perform an appender specific action. 024 025 <p>For example the {@link org.apache.log4j.net.SMTPAppender} sends 026 an email when the {@link #isTriggeringEvent} method returns 027 <code>true</code> and adds the event to an internal buffer when the 028 returned result is <code>false</code>. 029 030 @author Ceki Gülcü 031 @since version 1.0 032 033 */ 034public interface TriggeringEventEvaluator { 035 036 /** 037 Is this the triggering event? 038 */ 039 public boolean isTriggeringEvent(LoggingEvent event); 040}