| /* |
| * Copyright (C) 2018 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 com.android.server.timedetector; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.app.timedetector.ITimeDetectorService; |
| import android.app.timedetector.PhoneTimeSuggestion; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.database.ContentObserver; |
| import android.os.Binder; |
| import android.provider.Settings; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.util.DumpUtils; |
| import com.android.server.FgThread; |
| import com.android.server.SystemService; |
| import com.android.server.timedetector.TimeDetectorStrategy.Callback; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.util.Objects; |
| |
| public final class TimeDetectorService extends ITimeDetectorService.Stub { |
| private static final String TAG = "timedetector.TimeDetectorService"; |
| |
| public static class Lifecycle extends SystemService { |
| |
| public Lifecycle(@NonNull Context context) { |
| super(context); |
| } |
| |
| @Override |
| public void onStart() { |
| TimeDetectorService service = TimeDetectorService.create(getContext()); |
| |
| // Publish the binder service so it can be accessed from other (appropriately |
| // permissioned) processes. |
| publishBinderService(Context.TIME_DETECTOR_SERVICE, service); |
| } |
| } |
| |
| @NonNull private final Context mContext; |
| @NonNull private final Callback mCallback; |
| |
| // The lock used when call the strategy to ensure thread safety. |
| @NonNull private final Object mStrategyLock = new Object(); |
| |
| @GuardedBy("mStrategyLock") |
| @NonNull private final TimeDetectorStrategy mTimeDetectorStrategy; |
| |
| private static TimeDetectorService create(@NonNull Context context) { |
| final TimeDetectorStrategy timeDetector = new SimpleTimeDetectorStrategy(); |
| final TimeDetectorStrategyCallbackImpl callback = |
| new TimeDetectorStrategyCallbackImpl(context); |
| timeDetector.initialize(callback); |
| |
| TimeDetectorService timeDetectorService = |
| new TimeDetectorService(context, callback, timeDetector); |
| |
| // Wire up event listening. |
| ContentResolver contentResolver = context.getContentResolver(); |
| contentResolver.registerContentObserver( |
| Settings.Global.getUriFor(Settings.Global.AUTO_TIME), true, |
| new ContentObserver(FgThread.getHandler()) { |
| public void onChange(boolean selfChange) { |
| timeDetectorService.handleAutoTimeDetectionToggle(); |
| } |
| }); |
| |
| return timeDetectorService; |
| } |
| |
| @VisibleForTesting |
| public TimeDetectorService(@NonNull Context context, @NonNull Callback callback, |
| @NonNull TimeDetectorStrategy timeDetectorStrategy) { |
| mContext = Objects.requireNonNull(context); |
| mCallback = Objects.requireNonNull(callback); |
| mTimeDetectorStrategy = Objects.requireNonNull(timeDetectorStrategy); |
| } |
| |
| @Override |
| public void suggestPhoneTime(@NonNull PhoneTimeSuggestion timeSignal) { |
| enforceSetTimePermission(); |
| Objects.requireNonNull(timeSignal); |
| |
| long idToken = Binder.clearCallingIdentity(); |
| try { |
| synchronized (mStrategyLock) { |
| mTimeDetectorStrategy.suggestPhoneTime(timeSignal); |
| } |
| } finally { |
| Binder.restoreCallingIdentity(idToken); |
| } |
| } |
| |
| @VisibleForTesting |
| public void handleAutoTimeDetectionToggle() { |
| synchronized (mStrategyLock) { |
| final boolean timeDetectionEnabled = mCallback.isTimeDetectionEnabled(); |
| mTimeDetectorStrategy.handleAutoTimeDetectionToggle(timeDetectionEnabled); |
| } |
| } |
| |
| @Override |
| protected void dump(@NonNull FileDescriptor fd, @NonNull PrintWriter pw, |
| @Nullable String[] args) { |
| if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return; |
| |
| synchronized (mStrategyLock) { |
| mTimeDetectorStrategy.dump(pw, args); |
| } |
| } |
| |
| private void enforceSetTimePermission() { |
| mContext.enforceCallingPermission(android.Manifest.permission.SET_TIME, "set time"); |
| } |
| } |