1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.server;
18
19import com.android.internal.annotations.VisibleForTesting;
20
21import android.util.ArrayMap;
22
23/**
24 * This class is used in a similar way as ServiceManager, except the services registered here
25 * are not Binder objects and are only available in the same process.
26 *
27 * Once all services are converted to the SystemService interface, this class can be absorbed
28 * into SystemServiceManager.
29 *
30 * {@hide}
31 */
32public final class LocalServices {
33    private LocalServices() {}
34
35    private static final ArrayMap<Class<?>, Object> sLocalServiceObjects =
36            new ArrayMap<Class<?>, Object>();
37
38    /**
39     * Returns a local service instance that implements the specified interface.
40     *
41     * @param type The type of service.
42     * @return The service object.
43     */
44    @SuppressWarnings("unchecked")
45    public static <T> T getService(Class<T> type) {
46        synchronized (sLocalServiceObjects) {
47            return (T) sLocalServiceObjects.get(type);
48        }
49    }
50
51    /**
52     * Adds a service instance of the specified interface to the global registry of local services.
53     */
54    public static <T> void addService(Class<T> type, T service) {
55        synchronized (sLocalServiceObjects) {
56            if (sLocalServiceObjects.containsKey(type)) {
57                throw new IllegalStateException("Overriding service registration");
58            }
59            sLocalServiceObjects.put(type, service);
60        }
61    }
62
63    /**
64     * Remove a service instance, must be only used in tests.
65     */
66    @VisibleForTesting
67    public static <T> void removeServiceForTest(Class<T> type) {
68        synchronized (sLocalServiceObjects) {
69            sLocalServiceObjects.remove(type);
70        }
71    }
72}
73