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.activemq.util; 018 019import org.slf4j.MDC; 020 021import java.util.Hashtable; 022import java.util.Map; 023 024/** 025 * Helper class as MDC Log4J adapter doesn't behave well with null values 026 */ 027public class MDCHelper { 028 029 public static Map getCopyOfContextMap() { 030 Map map = MDC.getCopyOfContextMap(); 031 if (map == null) { 032 map = new Hashtable(); 033 } 034 return map; 035 } 036 037 public static void setContextMap(Map map) { 038 if (map == null) { 039 map = new Hashtable(); 040 } 041 MDC.setContextMap(map); 042 } 043 044}