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    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 G&uuml;lc&uuml;
    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  }