1 /* 2 * Copyright (C) 2019 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 android.car; 18 19 import android.annotation.NonNull; 20 import android.car.annotation.AddedInOrBefore; 21 import android.car.annotation.OptionalFeature; 22 import android.os.RemoteException; 23 import android.util.ArrayMap; 24 25 import com.android.internal.annotations.GuardedBy; 26 27 /** 28 * This class declares all car features which does not have API as {@code String}. 29 * 30 * <p>Note that all {@code Car*Managers'} feature string is their service name 31 * {@code Car.*_SERVICE.} 32 * For features with APIs, subfeature {@code String} will be also defined inside the API. 33 * 34 * <p>To prevent potential conflict in feature / subfeature name, all feature name should use 35 * implementation package name space like {@code com.android.car.user.FeatureA} unless it is 36 * {@code Car.*_SERVICE}. 37 * 38 * <p>To define a subfeature, main feature should be already declared and sub feature name should 39 * have the format of "main_feature/sub_feature_name". Note that feature name cannot use '/' and 40 * should use only alphabet, digit, '_', '-' and '.'. 41 * 42 * @hide 43 */ 44 public final class CarFeatures { 45 /** 46 * Service to show initial user notice screen. This feature has no API and thus defined here. 47 * @hide */ 48 @OptionalFeature 49 @AddedInOrBefore(majorVersion = 33) 50 public static String FEATURE_CAR_USER_NOTICE_SERVICE = 51 "com.android.car.user.CarUserNoticeService"; 52 53 // Local cache for making feature query fast. 54 // Key: feature name, value: supported or not. 55 @GuardedBy("mCachedFeatures") 56 private final ArrayMap<String, Boolean> mCachedFeatures = new ArrayMap<>(); 57 58 /** @hide */ isFeatureEnabled(@onNull ICar service, @NonNull String featureName)59 boolean isFeatureEnabled(@NonNull ICar service, @NonNull String featureName) { 60 synchronized (mCachedFeatures) { 61 Boolean supported = mCachedFeatures.get(featureName); 62 if (supported != null) { 63 return supported; 64 } 65 } 66 // Need to fetch from car service. This should happen only once 67 try { 68 boolean supported = service.isFeatureEnabled(featureName); 69 synchronized (mCachedFeatures) { 70 mCachedFeatures.put(featureName, Boolean.valueOf(supported)); 71 } 72 return supported; 73 } catch (RemoteException e) { 74 // car service has crashed. return false. 75 } 76 return false; 77 } 78 79 /** @hide */ resetCache()80 void resetCache() { 81 synchronized (mCachedFeatures) { 82 mCachedFeatures.clear(); 83 } 84 } 85 } 86