107 lines
3.6 KiB
Java
107 lines
3.6 KiB
Java
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.app.compat;
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import android.annotation.NonNull;
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import android.app.PropertyInvalidatedCache;
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import android.content.Context;
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import android.os.Binder;
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import android.os.RemoteException;
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import android.os.ServiceManager;
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import com.android.internal.compat.IPlatformCompat;
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/**
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* Handles caching of calls to {@link com.android.internal.compat.IPlatformCompat}
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* @hide
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*/
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public final class ChangeIdStateCache
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extends PropertyInvalidatedCache<ChangeIdStateQuery, Boolean> {
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private static final String CACHE_KEY = "cache_key.is_compat_change_enabled";
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private static final int MAX_ENTRIES = 64;
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private static boolean sDisabled = false;
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private volatile IPlatformCompat mPlatformCompat;
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/** @hide */
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public ChangeIdStateCache() {
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super(MAX_ENTRIES, CACHE_KEY);
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}
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/**
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* Disable cache.
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*
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* <p>Should only be used in unit tests.
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* @hide
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*/
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public static void disable() {
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sDisabled = true;
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}
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/**
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* Invalidate the cache.
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*
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* <p>Can only be called by the system server process.
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* @hide
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*/
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public static void invalidate() {
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if (!sDisabled) {
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PropertyInvalidatedCache.invalidateCache(CACHE_KEY);
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}
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}
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@NonNull
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IPlatformCompat getPlatformCompatService() {
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IPlatformCompat platformCompat = mPlatformCompat;
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if (platformCompat == null) {
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synchronized (this) {
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platformCompat = mPlatformCompat;
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if (platformCompat == null) {
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platformCompat = IPlatformCompat.Stub.asInterface(
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ServiceManager.getService(Context.PLATFORM_COMPAT_SERVICE));
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if (platformCompat == null) {
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throw new RuntimeException(
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"Could not get PlatformCompatService instance!");
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}
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mPlatformCompat = platformCompat;
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}
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}
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}
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return platformCompat;
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}
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@Override
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public Boolean recompute(ChangeIdStateQuery query) {
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final long token = Binder.clearCallingIdentity();
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try {
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if (query.type == ChangeIdStateQuery.QUERY_BY_PACKAGE_NAME) {
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return getPlatformCompatService().isChangeEnabledByPackageName(query.changeId,
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query.packageName,
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query.userId);
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} else if (query.type == ChangeIdStateQuery.QUERY_BY_UID) {
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return getPlatformCompatService().isChangeEnabledByUid(query.changeId, query.uid);
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} else {
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throw new IllegalArgumentException("Invalid query type: " + query.type);
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}
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} catch (RemoteException e) {
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e.rethrowFromSystemServer();
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} finally {
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Binder.restoreCallingIdentity(token);
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}
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throw new IllegalStateException("Could not recompute value!");
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}
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}
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