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/*
* 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.annotation.NonNull;
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;
private volatile IPlatformCompat mPlatformCompat;
/** @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);
}
}
@NonNull
IPlatformCompat getPlatformCompatService() {
IPlatformCompat platformCompat = mPlatformCompat;
if (platformCompat == null) {
synchronized (this) {
platformCompat = mPlatformCompat;
if (platformCompat == null) {
platformCompat = IPlatformCompat.Stub.asInterface(
ServiceManager.getService(Context.PLATFORM_COMPAT_SERVICE));
if (platformCompat == null) {
throw new RuntimeException(
"Could not get PlatformCompatService instance!");
}
mPlatformCompat = platformCompat;
}
}
}
return platformCompat;
}
@Override
public Boolean recompute(ChangeIdStateQuery query) {
final long token = Binder.clearCallingIdentity();
try {
if (query.type == ChangeIdStateQuery.QUERY_BY_PACKAGE_NAME) {
return getPlatformCompatService().isChangeEnabledByPackageName(query.changeId,
query.packageName,
query.userId);
} else if (query.type == ChangeIdStateQuery.QUERY_BY_UID) {
return getPlatformCompatService().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!");
}
}
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