1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.log4j.spi; 19 20 /** 21 22 Implementions of this interface allow certain appenders to decide 23 when to perform an appender specific action. 24 25 <p>For example the {@link org.apache.log4j.net.SMTPAppender} sends 26 an email when the {@link #isTriggeringEvent} method returns 27 <code>true</code> and adds the event to an internal buffer when the 28 returned result is <code>false</code>. 29 30 @author Ceki Gülcü 31 @since version 1.0 32 33 */ 34 public interface TriggeringEventEvaluator { 35 36 /** 37 Is this the triggering event? 38 */ 39 public boolean isTriggeringEvent(LoggingEvent event); 40 }