1 /* 2 * Copyright (C) 2020 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.app.compat; 18 19 import android.annotation.NonNull; 20 import android.app.PropertyInvalidatedCache; 21 import android.content.Context; 22 import android.os.Binder; 23 import android.os.RemoteException; 24 import android.os.ServiceManager; 25 26 import com.android.internal.compat.IPlatformCompat; 27 28 /** 29 * Handles caching of calls to {@link com.android.internal.compat.IPlatformCompat} 30 * @hide 31 */ 32 @android.ravenwood.annotation.RavenwoodKeepWholeClass 33 public final class ChangeIdStateCache 34 extends PropertyInvalidatedCache<ChangeIdStateQuery, Boolean> { 35 36 private static final String CACHE_MODULE = PropertyInvalidatedCache.MODULE_SYSTEM; 37 private static final String CACHE_API = "is_compat_change_enabled"; 38 39 private static final int MAX_ENTRIES = 2048; 40 private static boolean sDisabled = getDefaultDisabled(); 41 private volatile IPlatformCompat mPlatformCompat; 42 43 44 @android.ravenwood.annotation.RavenwoodReplace getDefaultDisabled()45 private static boolean getDefaultDisabled() { 46 return false; 47 } 48 getDefaultDisabled$ravenwood()49 private static boolean getDefaultDisabled$ravenwood() { 50 return true; // TODO(b/376676753) Disable the cache for now. 51 } 52 53 /** @hide */ ChangeIdStateCache()54 public ChangeIdStateCache() { 55 super(new PropertyInvalidatedCache.Args(CACHE_MODULE) 56 .maxEntries(MAX_ENTRIES) 57 .isolateUids(false) 58 .cacheNulls(false) 59 .api(CACHE_API), 60 CACHE_API, null); 61 } 62 63 /** 64 * Disable cache. 65 * 66 * <p>Should only be used in unit tests. 67 * @hide 68 */ disable()69 public static void disable() { 70 sDisabled = true; 71 } 72 73 /** 74 * Invalidate the cache. 75 * 76 * <p>Can only be called by the system server process. 77 * @hide 78 */ invalidate()79 public static void invalidate() { 80 if (!sDisabled) { 81 PropertyInvalidatedCache.invalidateCache(CACHE_MODULE, CACHE_API); 82 } 83 } 84 85 @NonNull getPlatformCompatService()86 IPlatformCompat getPlatformCompatService() { 87 IPlatformCompat platformCompat = mPlatformCompat; 88 if (platformCompat == null) { 89 synchronized (this) { 90 platformCompat = mPlatformCompat; 91 if (platformCompat == null) { 92 platformCompat = IPlatformCompat.Stub.asInterface( 93 ServiceManager.getService(Context.PLATFORM_COMPAT_SERVICE)); 94 if (platformCompat == null) { 95 throw new RuntimeException( 96 "Could not get PlatformCompatService instance!"); 97 } 98 mPlatformCompat = platformCompat; 99 } 100 } 101 } 102 return platformCompat; 103 } 104 105 @Override recompute(ChangeIdStateQuery query)106 public Boolean recompute(ChangeIdStateQuery query) { 107 final long token = Binder.clearCallingIdentity(); 108 try { 109 if (query.type == ChangeIdStateQuery.QUERY_BY_PACKAGE_NAME) { 110 return getPlatformCompatService().isChangeEnabledByPackageName(query.changeId, 111 query.packageName, 112 query.userId); 113 } else if (query.type == ChangeIdStateQuery.QUERY_BY_UID) { 114 return getPlatformCompatService().isChangeEnabledByUid(query.changeId, query.uid); 115 } else { 116 throw new IllegalArgumentException("Invalid query type: " + query.type); 117 } 118 } catch (RemoteException e) { 119 e.rethrowFromSystemServer(); 120 } finally { 121 Binder.restoreCallingIdentity(token); 122 } 123 throw new IllegalStateException("Could not recompute value!"); 124 } 125 } 126