1 package org.eclipse.aether.spi.locator;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.List;
23
24 /**
25 * A simple infrastructure to programmatically wire the various components of the repository system together when it is
26 * used outside of an IoC container. Once a concrete implementation of a service locator has been setup, clients could
27 * use
28 *
29 * <pre>
30 * RepositorySystem repoSystem = serviceLocator.getService( RepositorySystem.class );
31 * </pre>
32 *
33 * to acquire the repository system. Components that implement {@link Service} will be given an opportunity to acquire
34 * further components from the locator, thereby allowing to create the complete object graph of the repository system.
35 */
36 public interface ServiceLocator
37 {
38
39 /**
40 * Gets an instance of the specified service.
41 *
42 * @param <T> The service type.
43 * @param type The interface describing the service, must not be {@code null}.
44 * @return The service instance or {@code null} if the service could not be located/initialized.
45 */
46 <T> T getService( Class<T> type );
47
48 /**
49 * Gets all available instances of the specified service.
50 *
51 * @param <T> The service type.
52 * @param type The interface describing the service, must not be {@code null}.
53 * @return The (read-only) list of available service instances, never {@code null}.
54 */
55 <T> List<T> getServices( Class<T> type );
56
57 }