| /* |
| * Copyright (C) 2017 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.providers.tv; |
| |
| import android.content.Context; |
| import android.content.SharedPreferences; |
| import android.database.sqlite.SQLiteDatabase; |
| import android.media.tv.TvContract.Channels; |
| import android.media.tv.TvContract.PreviewPrograms; |
| import android.media.tv.TvContract.WatchNextPrograms; |
| import android.preference.PreferenceManager; |
| import android.provider.Settings; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.providers.tv.TvProvider.DatabaseHelper; |
| |
| /** |
| * Convenient class for deleting transient rows. This ensures that the clean up job is done only |
| * once after boot. |
| */ |
| public class TransientRowHelper { |
| private static final String PREF_KEY_LAST_DELETION_BOOT_COUNT = |
| "pref_key_last_deletion_boot_count"; |
| private static TransientRowHelper sInstance; |
| |
| private Context mContext; |
| private DatabaseHelper mDatabaseHelper; |
| @VisibleForTesting |
| protected boolean mTransientRowsDeleted; |
| |
| /** |
| * Returns the singleton TransientRowHelper instance. |
| * |
| * @param context The application context. |
| */ |
| public static TransientRowHelper getInstance(Context context) { |
| synchronized (TransientRowHelper.class) { |
| if (sInstance == null) { |
| sInstance = new TransientRowHelper(context); |
| } |
| } |
| return sInstance; |
| } |
| |
| @VisibleForTesting |
| TransientRowHelper(Context context) { |
| mContext = context; |
| mDatabaseHelper = DatabaseHelper.getInstance(context); |
| } |
| |
| @VisibleForTesting |
| TransientRowHelper(Context context, DatabaseHelper databaseHelper) { |
| mContext = context; |
| mDatabaseHelper = databaseHelper; |
| } |
| |
| /** |
| * Ensures that transient rows, inserted previously before current boot, are deleted. |
| */ |
| public synchronized void ensureOldTransientRowsDeleted() { |
| if (mTransientRowsDeleted) { |
| return; |
| } |
| mTransientRowsDeleted = true; |
| if (getLastDeletionBootCount() >= getBootCount()) { |
| // This can be the second execution of TvProvider after boot since system kills |
| // TvProvider in low memory conditions. If this is the case, we shouldn't delete |
| // transient rows. |
| return; |
| } |
| SQLiteDatabase db = mDatabaseHelper.getWritableDatabase(); |
| // Delete all the transient programs and channels. |
| db.delete(TvProvider.PREVIEW_PROGRAMS_TABLE, PreviewPrograms.COLUMN_TRANSIENT + "=1", null); |
| db.delete(TvProvider.CHANNELS_TABLE, Channels.COLUMN_TRANSIENT + "=1", null); |
| db.delete(TvProvider.WATCH_NEXT_PROGRAMS_TABLE, WatchNextPrograms.COLUMN_TRANSIENT + "=1", |
| null); |
| setLastDeletionBootCount(); |
| } |
| |
| @VisibleForTesting |
| protected int getBootCount() { |
| return Settings.Global.getInt(mContext.getContentResolver(), Settings.Global.BOOT_COUNT, |
| -1); |
| } |
| |
| @VisibleForTesting |
| protected int getLastDeletionBootCount() { |
| SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mContext); |
| return prefs.getInt(PREF_KEY_LAST_DELETION_BOOT_COUNT, -1); |
| } |
| |
| @VisibleForTesting |
| protected void setLastDeletionBootCount() { |
| SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(mContext) |
| .edit(); |
| editor.putInt(PREF_KEY_LAST_DELETION_BOOT_COUNT, getBootCount()); |
| editor.apply(); |
| } |
| } |