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 
17 package com.android.server;
18 
19 import com.android.internal.annotations.VisibleForTesting;
20 
21 import 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  */
32 public final class LocalServices {
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")
getService(Class<T> type)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      */
addService(Class<T> type, T service)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
removeServiceForTest(Class<T> type)67     public static <T> void removeServiceForTest(Class<T> type) {
68         synchronized (sLocalServiceObjects) {
69             sLocalServiceObjects.remove(type);
70         }
71     }
72 }
73