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 */ 017package org.apache.logging.log4j.core.appender; 018 019import org.apache.logging.log4j.Logger; 020import org.apache.logging.log4j.core.config.AppenderRef; 021import org.apache.logging.log4j.core.config.plugins.Plugin; 022import org.apache.logging.log4j.core.config.plugins.PluginElement; 023import org.apache.logging.log4j.core.config.plugins.PluginFactory; 024import org.apache.logging.log4j.status.StatusLogger; 025 026/** 027 * The array of failover Appenders. 028 */ 029@Plugin(name = "failovers", category = "Core") 030public final class FailoversPlugin { 031 032 private static final Logger LOGGER = StatusLogger.getLogger(); 033 034 /** 035 * Prevent instantiation. 036 */ 037 private FailoversPlugin() { 038 } 039 040 /** 041 * Returns the appender references. 042 * @param refs The references to return. 043 * @return The appender references. 044 */ 045 @PluginFactory 046 public static String[] createFailovers(@PluginElement("AppenderRef") final AppenderRef... refs) { 047 048 if (refs == null) { 049 LOGGER.error("failovers must contain an appender reference"); 050 return null; 051 } 052 final String[] arr = new String[refs.length]; 053 for (int i = 0; i < refs.length; ++i) { 054 arr[i] = refs[i].getRef(); 055 } 056 return arr; 057 } 058}