| /* |
| * Copyright (C) 2016 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.tv.data.epg; |
| |
| import android.content.ContentProviderOperation; |
| import android.content.ContentResolver; |
| import android.content.ContentValues; |
| import android.content.Context; |
| import android.content.OperationApplicationException; |
| import android.database.Cursor; |
| import android.media.tv.TvContract; |
| import android.media.tv.TvContract.Programs; |
| import android.media.tv.TvInputInfo; |
| import android.media.tv.TvInputManager.TvInputCallback; |
| import android.os.HandlerThread; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.os.RemoteException; |
| import android.preference.PreferenceManager; |
| import android.support.annotation.NonNull; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| import com.android.tv.Features; |
| import com.android.tv.TvApplication; |
| import com.android.tv.common.WeakHandler; |
| import com.android.tv.data.Channel; |
| import com.android.tv.data.Program; |
| import com.android.tv.util.RecurringRunner; |
| import com.android.tv.util.TvInputManagerHelper; |
| import com.android.tv.util.Utils; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * An utility class to fetch the EPG. This class isn't thread-safe. |
| */ |
| public class EpgFetcher { |
| private static final String TAG = "EpgFetcher"; |
| private static final boolean DEBUG = false; |
| |
| private static final int MSG_FETCH_EPG = 1; |
| |
| private static final long EPG_PREFETCH_RECURRING_PERIOD_MS = TimeUnit.HOURS.toMillis(4); |
| private static final long EPG_READER_INIT_WAIT_MS = TimeUnit.MINUTES.toMillis(1); |
| private static final long PROGRAM_QUERY_DURATION = TimeUnit.DAYS.toMillis(30); |
| |
| private static final int BATCH_OPERATION_COUNT = 100; |
| |
| // Value: Long |
| private static final String KEY_LAST_UPDATED_EPG_TIMESTAMP = |
| "com.android.tv.data.epg.EpgFetcher.LastUpdatedEpgTimestamp"; |
| |
| private final Context mContext; |
| private final TvInputManagerHelper mInputHelper; |
| private final TvInputCallback mInputCallback; |
| private HandlerThread mHandlerThread; |
| private EpgFetcherHandler mHandler; |
| private RecurringRunner mRecurringRunner; |
| |
| private long mLastEpgTimestamp = -1; |
| |
| public EpgFetcher(Context context) { |
| mContext = context; |
| mInputHelper = TvApplication.getSingletons(mContext).getTvInputManagerHelper(); |
| mInputCallback = new TvInputCallback() { |
| @Override |
| public void onInputAdded(String inputId) { |
| if (Utils.isInternalTvInput(mContext, inputId)) { |
| mHandler.removeMessages(MSG_FETCH_EPG); |
| mHandler.sendEmptyMessage(MSG_FETCH_EPG); |
| } |
| } |
| }; |
| } |
| |
| /** |
| * Starts fetching EPG. |
| */ |
| public void start() { |
| if (DEBUG) Log.d(TAG, "Request to start fetching EPG."); |
| if (!Features.FETCH_EPG.isEnabled(mContext)) { |
| return; |
| } |
| if (mHandlerThread == null) { |
| mHandlerThread = new HandlerThread("EpgFetcher"); |
| mHandlerThread.start(); |
| mHandler = new EpgFetcherHandler(mHandlerThread.getLooper(), this); |
| mInputHelper.addCallback(mInputCallback); |
| mRecurringRunner = new RecurringRunner(mContext, EPG_PREFETCH_RECURRING_PERIOD_MS, |
| new Runnable() { |
| @Override |
| public void run() { |
| mHandler.removeMessages(MSG_FETCH_EPG); |
| mHandler.sendEmptyMessage(MSG_FETCH_EPG); |
| } |
| }, null); |
| mRecurringRunner.start(); |
| } |
| } |
| |
| /** |
| * Stops fetching EPG. |
| */ |
| public void stop() { |
| if (mHandlerThread == null) { |
| return; |
| } |
| mRecurringRunner.stop(); |
| mHandler.removeCallbacksAndMessages(null); |
| mHandler = null; |
| mHandlerThread.quit(); |
| mHandlerThread = null; |
| } |
| |
| private void onFetchEpg() { |
| if (DEBUG) Log.d(TAG, "Start fetching EPG."); |
| // Check for the internal inputs. |
| boolean hasInternalInput = false; |
| for (TvInputInfo input : mInputHelper.getTvInputInfos(true, true)) { |
| if (Utils.isInternalTvInput(mContext, input.getId())) { |
| hasInternalInput = true; |
| break; |
| } |
| } |
| if (!hasInternalInput) { |
| if (DEBUG) Log.d(TAG, "No internal input found."); |
| return; |
| } |
| // Check if EPG reader is available. |
| EpgReader epgReader = new StubEpgReader(mContext); |
| if (!epgReader.isAvailable()) { |
| if (DEBUG) Log.d(TAG, "EPG reader is not temporarily available."); |
| mHandler.removeMessages(MSG_FETCH_EPG); |
| mHandler.sendEmptyMessageDelayed(MSG_FETCH_EPG, EPG_READER_INIT_WAIT_MS); |
| return; |
| } |
| // Check the EPG Timestamp. |
| long epgTimestamp = epgReader.getEpgTimestamp(); |
| if (epgTimestamp <= getLastUpdatedEpgTimestamp()) { |
| if (DEBUG) Log.d(TAG, "No new EPG."); |
| return; |
| } |
| |
| List<Channel> channels = epgReader.getChannels(); |
| for (Channel channel : channels) { |
| List<Program> programs = new ArrayList<>(epgReader.getPrograms(channel.getId())); |
| Collections.sort(programs); |
| if (DEBUG) { |
| Log.d(TAG, "Fetching " + programs.size() + " programs for channel " + channel); |
| } |
| updateEpg(channel.getId(), programs); |
| } |
| |
| setLastUpdatedEpgTimestamp(epgTimestamp); |
| } |
| |
| private long getLastUpdatedEpgTimestamp() { |
| if (mLastEpgTimestamp < 0) { |
| mLastEpgTimestamp = PreferenceManager.getDefaultSharedPreferences(mContext).getLong( |
| KEY_LAST_UPDATED_EPG_TIMESTAMP, 0); |
| } |
| return mLastEpgTimestamp; |
| } |
| |
| private void setLastUpdatedEpgTimestamp(long timestamp) { |
| mLastEpgTimestamp = timestamp; |
| PreferenceManager.getDefaultSharedPreferences(mContext).edit().putLong( |
| KEY_LAST_UPDATED_EPG_TIMESTAMP, timestamp); |
| } |
| |
| private void updateEpg(long channelId, List<Program> newPrograms) { |
| final int fetchedProgramsCount = newPrograms.size(); |
| if (fetchedProgramsCount == 0) { |
| return; |
| } |
| long startTimeMs = System.currentTimeMillis(); |
| long endTimeMs = startTimeMs + PROGRAM_QUERY_DURATION; |
| List<Program> oldPrograms = queryPrograms(mContext.getContentResolver(), channelId, |
| startTimeMs, endTimeMs); |
| Program currentOldProgram = oldPrograms.size() > 0 ? oldPrograms.get(0) : null; |
| int oldProgramsIndex = 0; |
| int newProgramsIndex = 0; |
| // Skip the past programs. They will be automatically removed by the system. |
| if (currentOldProgram != null) { |
| long oldStartTimeUtcMillis = currentOldProgram.getStartTimeUtcMillis(); |
| for (Program program : newPrograms) { |
| if (program.getEndTimeUtcMillis() > oldStartTimeUtcMillis) { |
| break; |
| } |
| newProgramsIndex++; |
| } |
| } |
| // Compare the new programs with old programs one by one and update/delete the old one |
| // or insert new program if there is no matching program in the database. |
| ArrayList<ContentProviderOperation> ops = new ArrayList<>(); |
| while (newProgramsIndex < fetchedProgramsCount) { |
| // TODO: Extract to method and make test. |
| Program oldProgram = oldProgramsIndex < oldPrograms.size() |
| ? oldPrograms.get(oldProgramsIndex) : null; |
| Program newProgram = newPrograms.get(newProgramsIndex); |
| boolean addNewProgram = false; |
| if (oldProgram != null) { |
| if (oldProgram.equals(newProgram)) { |
| // Exact match. No need to update. Move on to the next programs. |
| oldProgramsIndex++; |
| newProgramsIndex++; |
| } else if (isSameTitleAndOverlap(oldProgram, newProgram)) { |
| if (!oldProgram.equals(oldProgram)) { |
| // Partial match. Update the old program with the new one. |
| // NOTE: Use 'update' in this case instead of 'insert' and 'delete'. There |
| // could be application specific settings which belong to the old program. |
| ops.add(ContentProviderOperation.newUpdate( |
| TvContract.buildProgramUri(oldProgram.getId())) |
| .withValues(toContentValues(newProgram)) |
| .build()); |
| } |
| oldProgramsIndex++; |
| newProgramsIndex++; |
| } else if (oldProgram.getEndTimeUtcMillis() |
| < newProgram.getEndTimeUtcMillis()) { |
| // No match. Remove the old program first to see if the next program in |
| // {@code oldPrograms} partially matches the new program. |
| ops.add(ContentProviderOperation.newDelete( |
| TvContract.buildProgramUri(oldProgram.getId())) |
| .build()); |
| oldProgramsIndex++; |
| } else { |
| // No match. The new program does not match any of the old programs. Insert |
| // it as a new program. |
| addNewProgram = true; |
| newProgramsIndex++; |
| } |
| } else { |
| // No old programs. Just insert new programs. |
| addNewProgram = true; |
| newProgramsIndex++; |
| } |
| if (addNewProgram) { |
| ops.add(ContentProviderOperation |
| .newInsert(TvContract.Programs.CONTENT_URI) |
| .withValues(toContentValues(newProgram)) |
| .build()); |
| } |
| // Throttle the batch operation not to cause TransactionTooLargeException. |
| if (ops.size() > BATCH_OPERATION_COUNT || newProgramsIndex >= fetchedProgramsCount) { |
| try { |
| if (DEBUG) { |
| int size = ops.size(); |
| Log.d(TAG, "Running " + size + " operations for channel " + channelId); |
| for (int i = 0; i < size; ++i) { |
| Log.d(TAG, "Operation(" + i + "): " + ops.get(i)); |
| } |
| } |
| mContext.getContentResolver().applyBatch(TvContract.AUTHORITY, ops); |
| } catch (RemoteException | OperationApplicationException e) { |
| Log.e(TAG, "Failed to insert programs.", e); |
| return; |
| } |
| ops.clear(); |
| } |
| } |
| if (DEBUG) { |
| Log.d(TAG, "Fetched " + fetchedProgramsCount + " programs for channel " + channelId); |
| } |
| } |
| |
| private List<Program> queryPrograms(ContentResolver contentResolver, long channelId, |
| long startTimeMs, long endTimeMs) { |
| try (Cursor c = mContext.getContentResolver().query( |
| TvContract.buildProgramsUriForChannel(channelId, startTimeMs, endTimeMs), |
| Program.PROJECTION, null, null, Programs.COLUMN_START_TIME_UTC_MILLIS)) { |
| if (c == null) { |
| return Collections.EMPTY_LIST; |
| } |
| ArrayList<Program> programs = new ArrayList<>(); |
| while (c.moveToNext()) { |
| programs.add(Program.fromCursor(c)); |
| } |
| return programs; |
| } |
| } |
| |
| /** |
| * Returns {@code true} if the {@code oldProgram} program needs to be updated with the |
| * {@code newProgram} program. |
| */ |
| private boolean isSameTitleAndOverlap(Program oldProgram, Program newProgram) { |
| // NOTE: Here, we update the old program if it has the same title and overlaps with the |
| // new program. The test logic is just an example and you can modify this. E.g. check |
| // whether the both programs have the same program ID if your EPG supports any ID for |
| // the programs. |
| return Objects.equals(oldProgram.getTitle(), newProgram.getTitle()) |
| && oldProgram.getStartTimeUtcMillis() <= newProgram.getEndTimeUtcMillis() |
| && newProgram.getStartTimeUtcMillis() <= oldProgram.getEndTimeUtcMillis(); |
| } |
| |
| private static ContentValues toContentValues(Program program) { |
| ContentValues values = new ContentValues(); |
| values.put(TvContract.Programs.COLUMN_CHANNEL_ID, program.getChannelId()); |
| putValue(values, TvContract.Programs.COLUMN_TITLE, program.getTitle()); |
| putValue(values, TvContract.Programs.COLUMN_EPISODE_TITLE, program.getEpisodeTitle()); |
| putValue(values, TvContract.Programs.COLUMN_SEASON_NUMBER, program.getSeasonNumber()); |
| putValue(values, TvContract.Programs.COLUMN_EPISODE_NUMBER, program.getEpisodeNumber()); |
| putValue(values, TvContract.Programs.COLUMN_SHORT_DESCRIPTION, program.getDescription()); |
| putValue(values, TvContract.Programs.COLUMN_POSTER_ART_URI, program.getPosterArtUri()); |
| values.put(TvContract.Programs.COLUMN_START_TIME_UTC_MILLIS, |
| program.getStartTimeUtcMillis()); |
| values.put(TvContract.Programs.COLUMN_END_TIME_UTC_MILLIS, program.getEndTimeUtcMillis()); |
| return values; |
| } |
| |
| private static void putValue(ContentValues contentValues, String key, String value) { |
| if (TextUtils.isEmpty(value)) { |
| contentValues.putNull(key); |
| } else { |
| contentValues.put(key, value); |
| } |
| } |
| |
| private static class EpgFetcherHandler extends WeakHandler<EpgFetcher> { |
| public EpgFetcherHandler (@NonNull Looper looper, EpgFetcher ref) { |
| super(looper, ref); |
| } |
| |
| @Override |
| public void handleMessage(Message msg, @NonNull EpgFetcher epgFetcher) { |
| switch (msg.what) { |
| case MSG_FETCH_EPG: |
| epgFetcher.onFetchEpg(); |
| break; |
| default: |
| super.handleMessage(msg); |
| break; |
| } |
| } |
| } |
| } |
