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 */ 017 package org.apache.camel.spi; 018 019 import java.util.Map; 020 021 /** 022 * Represents a service registry which may be implemented via a Spring ApplicationContext, 023 * via JNDI, a simple Map or the OSGi Service Registry 024 * 025 * @version 026 */ 027 public interface Registry { 028 029 /** 030 * Looks up a service in the registry based purely on name, 031 * returning the service or <tt>null</tt> if it could not be found. 032 * 033 * @param name the name of the service 034 * @return the service from the registry or <tt>null</tt> if it could not be found 035 */ 036 Object lookup(String name); 037 038 /** 039 * Looks up a service in the registry, returning the service or <tt>null</tt> if it could not be found. 040 * 041 * @param name the name of the service 042 * @param type the type of the required service 043 * @return the service from the registry or <tt>null</tt> if it could not be found 044 */ 045 <T> T lookup(String name, Class<T> type); 046 047 /** 048 * Looks up services in the registry by their type. 049 * <p/> 050 * <b>Note:</b> Not all registry implementations support this feature, 051 * such as the {@link org.apache.camel.impl.JndiRegistry}. 052 * 053 * @param type the type of the registered services 054 * @return the types found, with their id as the key. Returns an empty Map if none found. 055 */ 056 <T> Map<String, T> lookupByType(Class<T> type); 057 058 }