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.Core; 021import org.apache.logging.log4j.core.config.AppenderRef; 022import org.apache.logging.log4j.core.config.plugins.Plugin; 023import org.apache.logging.log4j.core.config.plugins.PluginElement; 024import org.apache.logging.log4j.core.config.plugins.PluginFactory; 025import org.apache.logging.log4j.status.StatusLogger; 026 027/** 028 * The array of failover Appenders. 029 */ 030@Plugin(name = "failovers", category = Core.CATEGORY_NAME) 031public final class FailoversPlugin { 032 033 private static final Logger LOGGER = StatusLogger.getLogger(); 034 035 /** 036 * Prevent instantiation. 037 */ 038 private FailoversPlugin() { 039 } 040 041 /** 042 * Returns the appender references. 043 * @param refs The references to return. 044 * @return The appender references. 045 */ 046 @PluginFactory 047 public static String[] createFailovers(@PluginElement("AppenderRef") final AppenderRef... refs) { 048 049 if (refs == null) { 050 LOGGER.error("failovers must contain an appender reference"); 051 return null; 052 } 053 final String[] arr = new String[refs.length]; 054 for (int i = 0; i < refs.length; ++i) { 055 arr[i] = refs[i].getRef(); 056 } 057 return arr; 058 } 059}