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 $Revision: 762641 $
026 */
027 public interface Registry {
028
029 /**
030 * Looks up a service in the registry, returning the service or null if it could not be found.
031 *
032 * @param name the name of the service
033 * @param type the type of the required service
034 * @return the service from the registry or null if it could not be found
035 */
036 <T> T lookup(String name, Class<T> type);
037
038 /**
039 * Looks up a service in the registry based purely on name,
040 * returning the service or null if it could not be found.
041 *
042 * @param name the name of the service
043 * @return the service from the registry or null if it could not be found
044 */
045 Object lookup(String name);
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 }