| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.app.compat; |
| |
| import android.app.PropertyInvalidatedCache; |
| import android.content.Context; |
| import android.os.Binder; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| |
| import com.android.internal.compat.IPlatformCompat; |
| |
| /** |
| * Handles caching of calls to {@link com.android.internal.compat.IPlatformCompat} |
| * @hide |
| */ |
| public final class ChangeIdStateCache |
| extends PropertyInvalidatedCache<ChangeIdStateQuery, Boolean> { |
| private static final String CACHE_KEY = "cache_key.is_compat_change_enabled"; |
| private static final int MAX_ENTRIES = 20; |
| private static boolean sDisabled = false; |
| |
| /** @hide */ |
| public ChangeIdStateCache() { |
| super(MAX_ENTRIES, CACHE_KEY); |
| } |
| |
| /** |
| * Disable cache. |
| * |
| * <p>Should only be used in unit tests. |
| * @hide |
| */ |
| public static void disable() { |
| sDisabled = true; |
| } |
| |
| /** |
| * Invalidate the cache. |
| * |
| * <p>Can only be called by the system server process. |
| * @hide |
| */ |
| public static void invalidate() { |
| if (!sDisabled) { |
| PropertyInvalidatedCache.invalidateCache(CACHE_KEY); |
| } |
| } |
| |
| @Override |
| protected Boolean recompute(ChangeIdStateQuery query) { |
| IPlatformCompat platformCompat = IPlatformCompat.Stub.asInterface( |
| ServiceManager.getService(Context.PLATFORM_COMPAT_SERVICE)); |
| final long token = Binder.clearCallingIdentity(); |
| try { |
| if (query.type == ChangeIdStateQuery.QUERY_BY_PACKAGE_NAME) { |
| return platformCompat.isChangeEnabledByPackageName(query.changeId, |
| query.packageName, |
| query.userId); |
| } else if (query.type == ChangeIdStateQuery.QUERY_BY_UID) { |
| return platformCompat.isChangeEnabledByUid(query.changeId, query.uid); |
| } else { |
| throw new IllegalArgumentException("Invalid query type: " + query.type); |
| } |
| } catch (RemoteException e) { |
| e.rethrowFromSystemServer(); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| throw new IllegalStateException("Could not recompute value!"); |
| } |
| } |