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.camel.util.jndi; 018 019import java.util.Hashtable; 020import javax.naming.Context; 021import javax.naming.NamingException; 022 023/** 024 * A factory of the Camel {@link javax.naming.InitialContext} which allows a {@link java.util.Map} to be used to create a 025 * JNDI context. 026 * <p/> 027 * This implementation is singleton based, by creating a <b>new</b> context once, and reusing it on each call to 028 * {@link #getInitialContext(java.util.Hashtable)}. 029 * 030 * @version 031 */ 032public class CamelSingletonInitialContextFactory extends CamelInitialContextFactory { 033 034 private static volatile Context context; 035 036 /** 037 * Gets or creates the context with the given environment. 038 * <p/> 039 * This implementation will create the context once, and then return the same instance 040 * on multiple calls. 041 * 042 * @param environment the environment, must not be <tt>null</tt> 043 * @return the created context. 044 * @throws javax.naming.NamingException is thrown if creation failed. 045 */ 046 public synchronized Context getInitialContext(Hashtable<?, ?> environment) throws NamingException { 047 if (context == null) { 048 context = super.getInitialContext(environment); 049 } 050 return context; 051 } 052}