001 /** 002 * 003 * Licensed to the Apache Software Foundation (ASF) under one or more 004 * contributor license agreements. See the NOTICE file distributed with 005 * this work for additional information regarding copyright ownership. 006 * The ASF licenses this file to You under the Apache License, Version 2.0 007 * (the "License"); you may not use this file except in compliance with 008 * the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 package org.apache.camel.impl; 019 020 import org.apache.camel.impl.converter.TypeConverterRegistry; 021 022 /** 023 * A caching proxy so that a single 024 * @version $Revision: 525537 $ 025 */ 026 public class CachingInjector<T> { 027 private final TypeConverterRegistry repository; 028 private final Class<T> type; 029 private T instance; 030 031 public CachingInjector(TypeConverterRegistry repository, Class<T> type) { 032 this.repository = repository; 033 this.type = type; 034 } 035 036 public synchronized T newInstance() { 037 if (instance == null) { 038 instance = createInstance(type); 039 } 040 return instance; 041 } 042 043 protected T createInstance(Class<T> type) { 044 return (T) repository.getInjector().newInstance(type); 045 } 046 }