| /* |
| * Copyright (C) 2014 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.am; |
| |
| import android.annotation.NonNull; |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| import android.os.Debug; |
| import android.os.Environment; |
| import android.os.FileUtils; |
| import android.os.Process; |
| import android.os.SystemClock; |
| import android.util.ArraySet; |
| import android.util.AtomicFile; |
| import android.util.Slog; |
| import android.util.SparseArray; |
| import android.util.SparseBooleanArray; |
| import android.util.Xml; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.util.FastXmlSerializer; |
| import com.android.internal.util.XmlUtils; |
| import libcore.io.IoUtils; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| import org.xmlpull.v1.XmlSerializer; |
| |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.FileReader; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.io.StringWriter; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| public class TaskPersister { |
| static final String TAG = "TaskPersister"; |
| static final boolean DEBUG = false; |
| |
| /** When not flushing don't write out files faster than this */ |
| private static final long INTER_WRITE_DELAY_MS = 500; |
| |
| /** |
| * When not flushing delay this long before writing the first file out. This gives the next task |
| * being launched a chance to load its resources without this occupying IO bandwidth. |
| */ |
| private static final long PRE_TASK_DELAY_MS = 3000; |
| |
| /** The maximum number of entries to keep in the queue before draining it automatically. */ |
| private static final int MAX_WRITE_QUEUE_LENGTH = 6; |
| |
| /** Special value for mWriteTime to mean don't wait, just write */ |
| private static final long FLUSH_QUEUE = -1; |
| |
| private static final String RECENTS_FILENAME = "_task"; |
| private static final String TASKS_DIRNAME = "recent_tasks"; |
| private static final String TASK_EXTENSION = ".xml"; |
| private static final String IMAGES_DIRNAME = "recent_images"; |
| private static final String PERSISTED_TASK_IDS_FILENAME = "persisted_taskIds.txt"; |
| static final String IMAGE_EXTENSION = ".png"; |
| |
| private static final String TAG_TASK = "task"; |
| |
| private final ActivityManagerService mService; |
| private final ActivityStackSupervisor mStackSupervisor; |
| private final RecentTasks mRecentTasks; |
| private final SparseArray<SparseBooleanArray> mTaskIdsInFile = new SparseArray<>(); |
| private final File mTaskIdsDir; |
| |
| /** |
| * Value determines write delay mode as follows: < 0 We are Flushing. No delays between writes |
| * until the image queue is drained and all tasks needing persisting are written to disk. There |
| * is no delay between writes. == 0 We are Idle. Next writes will be delayed by |
| * #PRE_TASK_DELAY_MS. > 0 We are Actively writing. Next write will be at this time. Subsequent |
| * writes will be delayed by #INTER_WRITE_DELAY_MS. |
| */ |
| private long mNextWriteTime = 0; |
| |
| private final LazyTaskWriterThread mLazyTaskWriterThread; |
| |
| private static class WriteQueueItem {} |
| |
| private static class TaskWriteQueueItem extends WriteQueueItem { |
| final TaskRecord mTask; |
| |
| TaskWriteQueueItem(TaskRecord task) { |
| mTask = task; |
| } |
| } |
| |
| private static class ImageWriteQueueItem extends WriteQueueItem { |
| final String mFilePath; |
| Bitmap mImage; |
| |
| ImageWriteQueueItem(String filePath, Bitmap image) { |
| mFilePath = filePath; |
| mImage = image; |
| } |
| } |
| |
| ArrayList<WriteQueueItem> mWriteQueue = new ArrayList<WriteQueueItem>(); |
| |
| TaskPersister(File systemDir, ActivityStackSupervisor stackSupervisor, |
| ActivityManagerService service, RecentTasks recentTasks) { |
| |
| final File legacyImagesDir = new File(systemDir, IMAGES_DIRNAME); |
| if (legacyImagesDir.exists()) { |
| if (!FileUtils.deleteContents(legacyImagesDir) || !legacyImagesDir.delete()) { |
| Slog.i(TAG, "Failure deleting legacy images directory: " + legacyImagesDir); |
| } |
| } |
| |
| final File legacyTasksDir = new File(systemDir, TASKS_DIRNAME); |
| if (legacyTasksDir.exists()) { |
| if (!FileUtils.deleteContents(legacyTasksDir) || !legacyTasksDir.delete()) { |
| Slog.i(TAG, "Failure deleting legacy tasks directory: " + legacyTasksDir); |
| } |
| } |
| |
| mTaskIdsDir = new File(Environment.getDataDirectory(), "system_de"); |
| mStackSupervisor = stackSupervisor; |
| mService = service; |
| mRecentTasks = recentTasks; |
| mLazyTaskWriterThread = new LazyTaskWriterThread("LazyTaskWriterThread"); |
| } |
| |
| @VisibleForTesting |
| TaskPersister(File workingDir) { |
| mTaskIdsDir = workingDir; |
| mStackSupervisor = null; |
| mService = null; |
| mRecentTasks = null; |
| mLazyTaskWriterThread = new LazyTaskWriterThread("LazyTaskWriterThreadTest"); |
| } |
| |
| void startPersisting() { |
| if (!mLazyTaskWriterThread.isAlive()) { |
| mLazyTaskWriterThread.start(); |
| } |
| } |
| |
| private void removeThumbnails(TaskRecord task) { |
| final String taskString = Integer.toString(task.taskId); |
| for (int queueNdx = mWriteQueue.size() - 1; queueNdx >= 0; --queueNdx) { |
| final WriteQueueItem item = mWriteQueue.get(queueNdx); |
| if (item instanceof ImageWriteQueueItem) { |
| final File thumbnailFile = new File(((ImageWriteQueueItem) item).mFilePath); |
| if (thumbnailFile.getName().startsWith(taskString)) { |
| if (DEBUG) { |
| Slog.d(TAG, "Removing " + ((ImageWriteQueueItem) item).mFilePath + |
| " from write queue"); |
| } |
| mWriteQueue.remove(queueNdx); |
| } |
| } |
| } |
| } |
| |
| private void yieldIfQueueTooDeep() { |
| boolean stall = false; |
| synchronized (this) { |
| if (mNextWriteTime == FLUSH_QUEUE) { |
| stall = true; |
| } |
| } |
| if (stall) { |
| Thread.yield(); |
| } |
| } |
| |
| @NonNull |
| SparseBooleanArray loadPersistedTaskIdsForUser(int userId) { |
| if (mTaskIdsInFile.get(userId) != null) { |
| return mTaskIdsInFile.get(userId).clone(); |
| } |
| final SparseBooleanArray persistedTaskIds = new SparseBooleanArray(); |
| BufferedReader reader = null; |
| String line; |
| try { |
| reader = new BufferedReader(new FileReader(getUserPersistedTaskIdsFile(userId))); |
| while ((line = reader.readLine()) != null) { |
| for (String taskIdString : line.split("\\s+")) { |
| int id = Integer.parseInt(taskIdString); |
| persistedTaskIds.put(id, true); |
| } |
| } |
| } catch (FileNotFoundException e) { |
| // File doesn't exist. Ignore. |
| } catch (Exception e) { |
| Slog.e(TAG, "Error while reading taskIds file for user " + userId, e); |
| } finally { |
| IoUtils.closeQuietly(reader); |
| } |
| mTaskIdsInFile.put(userId, persistedTaskIds); |
| return persistedTaskIds.clone(); |
| } |
| |
| @VisibleForTesting |
| void maybeWritePersistedTaskIdsForUser(@NonNull SparseBooleanArray taskIds, int userId) { |
| if (userId < 0) { |
| return; |
| } |
| SparseBooleanArray persistedIdsInFile = mTaskIdsInFile.get(userId); |
| if (persistedIdsInFile != null && persistedIdsInFile.equals(taskIds)) { |
| return; |
| } |
| final File persistedTaskIdsFile = getUserPersistedTaskIdsFile(userId); |
| BufferedWriter writer = null; |
| try { |
| writer = new BufferedWriter(new FileWriter(persistedTaskIdsFile)); |
| for (int i = 0; i < taskIds.size(); i++) { |
| if (taskIds.valueAt(i)) { |
| writer.write(String.valueOf(taskIds.keyAt(i))); |
| writer.newLine(); |
| } |
| } |
| } catch (Exception e) { |
| Slog.e(TAG, "Error while writing taskIds file for user " + userId, e); |
| } finally { |
| IoUtils.closeQuietly(writer); |
| } |
| mTaskIdsInFile.put(userId, taskIds.clone()); |
| } |
| |
| void unloadUserDataFromMemory(int userId) { |
| mTaskIdsInFile.delete(userId); |
| } |
| |
| void wakeup(TaskRecord task, boolean flush) { |
| synchronized (this) { |
| if (task != null) { |
| int queueNdx; |
| for (queueNdx = mWriteQueue.size() - 1; queueNdx >= 0; --queueNdx) { |
| final WriteQueueItem item = mWriteQueue.get(queueNdx); |
| if (item instanceof TaskWriteQueueItem && |
| ((TaskWriteQueueItem) item).mTask == task) { |
| if (!task.inRecents) { |
| // This task is being removed. |
| removeThumbnails(task); |
| } |
| break; |
| } |
| } |
| if (queueNdx < 0 && task.isPersistable) { |
| mWriteQueue.add(new TaskWriteQueueItem(task)); |
| } |
| } else { |
| // Dummy. Ensures removeObsoleteFiles is called when LazyTaskThreadWriter is |
| // notified. |
| mWriteQueue.add(new WriteQueueItem()); |
| } |
| if (flush || mWriteQueue.size() > MAX_WRITE_QUEUE_LENGTH) { |
| mNextWriteTime = FLUSH_QUEUE; |
| } else if (mNextWriteTime == 0) { |
| mNextWriteTime = SystemClock.uptimeMillis() + PRE_TASK_DELAY_MS; |
| } |
| if (DEBUG) Slog.d(TAG, "wakeup: task=" + task + " flush=" + flush + " mNextWriteTime=" |
| + mNextWriteTime + " mWriteQueue.size=" + mWriteQueue.size() |
| + " Callers=" + Debug.getCallers(4)); |
| notifyAll(); |
| } |
| |
| yieldIfQueueTooDeep(); |
| } |
| |
| void flush() { |
| synchronized (this) { |
| mNextWriteTime = FLUSH_QUEUE; |
| notifyAll(); |
| do { |
| try { |
| wait(); |
| } catch (InterruptedException e) { |
| } |
| } while (mNextWriteTime == FLUSH_QUEUE); |
| } |
| } |
| |
| void saveImage(Bitmap image, String filePath) { |
| synchronized (this) { |
| int queueNdx; |
| for (queueNdx = mWriteQueue.size() - 1; queueNdx >= 0; --queueNdx) { |
| final WriteQueueItem item = mWriteQueue.get(queueNdx); |
| if (item instanceof ImageWriteQueueItem) { |
| ImageWriteQueueItem imageWriteQueueItem = (ImageWriteQueueItem) item; |
| if (imageWriteQueueItem.mFilePath.equals(filePath)) { |
| // replace the Bitmap with the new one. |
| imageWriteQueueItem.mImage = image; |
| break; |
| } |
| } |
| } |
| if (queueNdx < 0) { |
| mWriteQueue.add(new ImageWriteQueueItem(filePath, image)); |
| } |
| if (mWriteQueue.size() > MAX_WRITE_QUEUE_LENGTH) { |
| mNextWriteTime = FLUSH_QUEUE; |
| } else if (mNextWriteTime == 0) { |
| mNextWriteTime = SystemClock.uptimeMillis() + PRE_TASK_DELAY_MS; |
| } |
| if (DEBUG) Slog.d(TAG, "saveImage: filePath=" + filePath + " now=" + |
| SystemClock.uptimeMillis() + " mNextWriteTime=" + |
| mNextWriteTime + " Callers=" + Debug.getCallers(4)); |
| notifyAll(); |
| } |
| |
| yieldIfQueueTooDeep(); |
| } |
| |
| Bitmap getTaskDescriptionIcon(String filePath) { |
| // See if it is in the write queue |
| final Bitmap icon = getImageFromWriteQueue(filePath); |
| if (icon != null) { |
| return icon; |
| } |
| return restoreImage(filePath); |
| } |
| |
| Bitmap getImageFromWriteQueue(String filePath) { |
| synchronized (this) { |
| for (int queueNdx = mWriteQueue.size() - 1; queueNdx >= 0; --queueNdx) { |
| final WriteQueueItem item = mWriteQueue.get(queueNdx); |
| if (item instanceof ImageWriteQueueItem) { |
| ImageWriteQueueItem imageWriteQueueItem = (ImageWriteQueueItem) item; |
| if (imageWriteQueueItem.mFilePath.equals(filePath)) { |
| return imageWriteQueueItem.mImage; |
| } |
| } |
| } |
| return null; |
| } |
| } |
| |
| private StringWriter saveToXml(TaskRecord task) throws IOException, XmlPullParserException { |
| if (DEBUG) Slog.d(TAG, "saveToXml: task=" + task); |
| final XmlSerializer xmlSerializer = new FastXmlSerializer(); |
| StringWriter stringWriter = new StringWriter(); |
| xmlSerializer.setOutput(stringWriter); |
| |
| if (DEBUG) xmlSerializer.setFeature( |
| "http://xmlpull.org/v1/doc/features.html#indent-output", true); |
| |
| // save task |
| xmlSerializer.startDocument(null, true); |
| |
| xmlSerializer.startTag(null, TAG_TASK); |
| task.saveToXml(xmlSerializer); |
| xmlSerializer.endTag(null, TAG_TASK); |
| |
| xmlSerializer.endDocument(); |
| xmlSerializer.flush(); |
| |
| return stringWriter; |
| } |
| |
| private String fileToString(File file) { |
| final String newline = System.lineSeparator(); |
| try { |
| BufferedReader reader = new BufferedReader(new FileReader(file)); |
| StringBuffer sb = new StringBuffer((int) file.length() * 2); |
| String line; |
| while ((line = reader.readLine()) != null) { |
| sb.append(line + newline); |
| } |
| reader.close(); |
| return sb.toString(); |
| } catch (IOException ioe) { |
| Slog.e(TAG, "Couldn't read file " + file.getName()); |
| return null; |
| } |
| } |
| |
| private TaskRecord taskIdToTask(int taskId, ArrayList<TaskRecord> tasks) { |
| if (taskId < 0) { |
| return null; |
| } |
| for (int taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) { |
| final TaskRecord task = tasks.get(taskNdx); |
| if (task.taskId == taskId) { |
| return task; |
| } |
| } |
| Slog.e(TAG, "Restore affiliation error looking for taskId=" + taskId); |
| return null; |
| } |
| |
| List<TaskRecord> restoreTasksForUserLocked(final int userId) { |
| final ArrayList<TaskRecord> tasks = new ArrayList<TaskRecord>(); |
| ArraySet<Integer> recoveredTaskIds = new ArraySet<Integer>(); |
| |
| File userTasksDir = getUserTasksDir(userId); |
| |
| File[] recentFiles = userTasksDir.listFiles(); |
| if (recentFiles == null) { |
| Slog.e(TAG, "restoreTasksForUserLocked: Unable to list files from " + userTasksDir); |
| return tasks; |
| } |
| |
| for (int taskNdx = 0; taskNdx < recentFiles.length; ++taskNdx) { |
| File taskFile = recentFiles[taskNdx]; |
| if (DEBUG) { |
| Slog.d(TAG, "restoreTasksForUserLocked: userId=" + userId |
| + ", taskFile=" + taskFile.getName()); |
| } |
| BufferedReader reader = null; |
| boolean deleteFile = false; |
| try { |
| reader = new BufferedReader(new FileReader(taskFile)); |
| final XmlPullParser in = Xml.newPullParser(); |
| in.setInput(reader); |
| |
| int event; |
| while (((event = in.next()) != XmlPullParser.END_DOCUMENT) && |
| event != XmlPullParser.END_TAG) { |
| final String name = in.getName(); |
| if (event == XmlPullParser.START_TAG) { |
| if (DEBUG) Slog.d(TAG, "restoreTasksForUserLocked: START_TAG name=" + name); |
| if (TAG_TASK.equals(name)) { |
| final TaskRecord task = TaskRecord.restoreFromXml(in, mStackSupervisor); |
| if (DEBUG) Slog.d(TAG, "restoreTasksForUserLocked: restored task=" |
| + task); |
| if (task != null) { |
| // XXX Don't add to write queue... there is no reason to write |
| // out the stuff we just read, if we don't write it we will |
| // read the same thing again. |
| // mWriteQueue.add(new TaskWriteQueueItem(task)); |
| |
| final int taskId = task.taskId; |
| if (mStackSupervisor.anyTaskForIdLocked(taskId, |
| /* restoreFromRecents= */ false, 0) != null) { |
| // Should not happen. |
| Slog.wtf(TAG, "Existing task with taskId " + taskId + "found"); |
| } else if (userId != task.userId) { |
| // Should not happen. |
| Slog.wtf(TAG, "Task with userId " + task.userId + " found in " |
| + userTasksDir.getAbsolutePath()); |
| } else { |
| // Looks fine. |
| mStackSupervisor.setNextTaskIdForUserLocked(taskId, userId); |
| task.isPersistable = true; |
| tasks.add(task); |
| recoveredTaskIds.add(taskId); |
| } |
| } else { |
| Slog.e(TAG, "restoreTasksForUserLocked: Unable to restore taskFile=" |
| + taskFile + ": " + fileToString(taskFile)); |
| } |
| } else { |
| Slog.wtf(TAG, "restoreTasksForUserLocked: Unknown xml event=" + event |
| + " name=" + name); |
| } |
| } |
| XmlUtils.skipCurrentTag(in); |
| } |
| } catch (Exception e) { |
| Slog.wtf(TAG, "Unable to parse " + taskFile + ". Error ", e); |
| Slog.e(TAG, "Failing file: " + fileToString(taskFile)); |
| deleteFile = true; |
| } finally { |
| IoUtils.closeQuietly(reader); |
| if (deleteFile) { |
| if (DEBUG) Slog.d(TAG, "Deleting file=" + taskFile.getName()); |
| taskFile.delete(); |
| } |
| } |
| } |
| |
| if (!DEBUG) { |
| removeObsoleteFiles(recoveredTaskIds, userTasksDir.listFiles()); |
| } |
| |
| // Fix up task affiliation from taskIds |
| for (int taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) { |
| final TaskRecord task = tasks.get(taskNdx); |
| task.setPrevAffiliate(taskIdToTask(task.mPrevAffiliateTaskId, tasks)); |
| task.setNextAffiliate(taskIdToTask(task.mNextAffiliateTaskId, tasks)); |
| } |
| |
| Collections.sort(tasks, new Comparator<TaskRecord>() { |
| @Override |
| public int compare(TaskRecord lhs, TaskRecord rhs) { |
| final long diff = rhs.mLastTimeMoved - lhs.mLastTimeMoved; |
| if (diff < 0) { |
| return -1; |
| } else if (diff > 0) { |
| return +1; |
| } else { |
| return 0; |
| } |
| } |
| }); |
| return tasks; |
| } |
| |
| private static void removeObsoleteFiles(ArraySet<Integer> persistentTaskIds, File[] files) { |
| if (DEBUG) Slog.d(TAG, "removeObsoleteFiles: persistentTaskIds=" + persistentTaskIds + |
| " files=" + files); |
| if (files == null) { |
| Slog.e(TAG, "File error accessing recents directory (directory doesn't exist?)."); |
| return; |
| } |
| for (int fileNdx = 0; fileNdx < files.length; ++fileNdx) { |
| File file = files[fileNdx]; |
| String filename = file.getName(); |
| final int taskIdEnd = filename.indexOf('_'); |
| if (taskIdEnd > 0) { |
| final int taskId; |
| try { |
| taskId = Integer.parseInt(filename.substring(0, taskIdEnd)); |
| if (DEBUG) Slog.d(TAG, "removeObsoleteFiles: Found taskId=" + taskId); |
| } catch (Exception e) { |
| Slog.wtf(TAG, "removeObsoleteFiles: Can't parse file=" + file.getName()); |
| file.delete(); |
| continue; |
| } |
| if (!persistentTaskIds.contains(taskId)) { |
| if (DEBUG) Slog.d(TAG, "removeObsoleteFiles: deleting file=" + file.getName()); |
| file.delete(); |
| } |
| } |
| } |
| } |
| |
| private void writeTaskIdsFiles() { |
| int candidateUserIds[]; |
| synchronized (mService) { |
| candidateUserIds = mRecentTasks.usersWithRecentsLoadedLocked(); |
| } |
| SparseBooleanArray taskIdsToSave; |
| for (int userId : candidateUserIds) { |
| synchronized (mService) { |
| taskIdsToSave = mRecentTasks.mPersistedTaskIds.get(userId).clone(); |
| } |
| maybeWritePersistedTaskIdsForUser(taskIdsToSave, userId); |
| } |
| } |
| |
| private void removeObsoleteFiles(ArraySet<Integer> persistentTaskIds) { |
| int[] candidateUserIds; |
| synchronized (mService) { |
| // Remove only from directories of the users who have recents in memory synchronized |
| // with persistent storage. |
| candidateUserIds = mRecentTasks.usersWithRecentsLoadedLocked(); |
| } |
| for (int userId : candidateUserIds) { |
| removeObsoleteFiles(persistentTaskIds, getUserImagesDir(userId).listFiles()); |
| removeObsoleteFiles(persistentTaskIds, getUserTasksDir(userId).listFiles()); |
| } |
| } |
| |
| static Bitmap restoreImage(String filename) { |
| if (DEBUG) Slog.d(TAG, "restoreImage: restoring " + filename); |
| return BitmapFactory.decodeFile(filename); |
| } |
| |
| private File getUserPersistedTaskIdsFile(int userId) { |
| File userTaskIdsDir = new File(mTaskIdsDir, String.valueOf(userId)); |
| if (!userTaskIdsDir.exists() && !userTaskIdsDir.mkdirs()) { |
| Slog.e(TAG, "Error while creating user directory: " + userTaskIdsDir); |
| } |
| return new File(userTaskIdsDir, PERSISTED_TASK_IDS_FILENAME); |
| } |
| |
| static File getUserTasksDir(int userId) { |
| File userTasksDir = new File(Environment.getDataSystemCeDirectory(userId), TASKS_DIRNAME); |
| |
| if (!userTasksDir.exists()) { |
| if (!userTasksDir.mkdir()) { |
| Slog.e(TAG, "Failure creating tasks directory for user " + userId + ": " |
| + userTasksDir); |
| } |
| } |
| return userTasksDir; |
| } |
| |
| static File getUserImagesDir(int userId) { |
| return new File(Environment.getDataSystemCeDirectory(userId), IMAGES_DIRNAME); |
| } |
| |
| private static boolean createParentDirectory(String filePath) { |
| File parentDir = new File(filePath).getParentFile(); |
| return parentDir.exists() || parentDir.mkdirs(); |
| } |
| |
| private class LazyTaskWriterThread extends Thread { |
| |
| LazyTaskWriterThread(String name) { |
| super(name); |
| } |
| |
| @Override |
| public void run() { |
| Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); |
| ArraySet<Integer> persistentTaskIds = new ArraySet<Integer>(); |
| while (true) { |
| // We can't lock mService while holding TaskPersister.this, but we don't want to |
| // call removeObsoleteFiles every time through the loop, only the last time before |
| // going to sleep. The risk is that we call removeObsoleteFiles() successively. |
| final boolean probablyDone; |
| synchronized (TaskPersister.this) { |
| probablyDone = mWriteQueue.isEmpty(); |
| } |
| if (probablyDone) { |
| if (DEBUG) Slog.d(TAG, "Looking for obsolete files."); |
| persistentTaskIds.clear(); |
| synchronized (mService) { |
| if (DEBUG) Slog.d(TAG, "mRecents=" + mRecentTasks); |
| for (int taskNdx = mRecentTasks.size() - 1; taskNdx >= 0; --taskNdx) { |
| final TaskRecord task = mRecentTasks.get(taskNdx); |
| if (DEBUG) Slog.d(TAG, "LazyTaskWriter: task=" + task + |
| " persistable=" + task.isPersistable); |
| if ((task.isPersistable || task.inRecents) |
| && (task.stack == null || !task.stack.isHomeStack())) { |
| if (DEBUG) Slog.d(TAG, "adding to persistentTaskIds task=" + task); |
| persistentTaskIds.add(task.taskId); |
| } else { |
| if (DEBUG) Slog.d(TAG, |
| "omitting from persistentTaskIds task=" + task); |
| } |
| } |
| } |
| removeObsoleteFiles(persistentTaskIds); |
| } |
| writeTaskIdsFiles(); |
| |
| // If mNextWriteTime, then don't delay between each call to saveToXml(). |
| final WriteQueueItem item; |
| synchronized (TaskPersister.this) { |
| if (mNextWriteTime != FLUSH_QUEUE) { |
| // The next write we don't have to wait so long. |
| mNextWriteTime = SystemClock.uptimeMillis() + INTER_WRITE_DELAY_MS; |
| if (DEBUG) Slog.d(TAG, "Next write time may be in " + |
| INTER_WRITE_DELAY_MS + " msec. (" + mNextWriteTime + ")"); |
| } |
| |
| while (mWriteQueue.isEmpty()) { |
| if (mNextWriteTime != 0) { |
| mNextWriteTime = 0; // idle. |
| TaskPersister.this.notifyAll(); // wake up flush() if needed. |
| } |
| try { |
| if (DEBUG) Slog.d(TAG, "LazyTaskWriter: waiting indefinitely."); |
| TaskPersister.this.wait(); |
| } catch (InterruptedException e) { |
| } |
| // Invariant: mNextWriteTime is either FLUSH_QUEUE or PRE_WRITE_DELAY_MS |
| // from now. |
| } |
| item = mWriteQueue.remove(0); |
| |
| long now = SystemClock.uptimeMillis(); |
| if (DEBUG) Slog.d(TAG, "LazyTaskWriter: now=" + now + " mNextWriteTime=" + |
| mNextWriteTime + " mWriteQueue.size=" + mWriteQueue.size()); |
| while (now < mNextWriteTime) { |
| try { |
| if (DEBUG) Slog.d(TAG, "LazyTaskWriter: waiting " + |
| (mNextWriteTime - now)); |
| TaskPersister.this.wait(mNextWriteTime - now); |
| } catch (InterruptedException e) { |
| } |
| now = SystemClock.uptimeMillis(); |
| } |
| |
| // Got something to do. |
| } |
| |
| if (item instanceof ImageWriteQueueItem) { |
| ImageWriteQueueItem imageWriteQueueItem = (ImageWriteQueueItem) item; |
| final String filePath = imageWriteQueueItem.mFilePath; |
| if (!createParentDirectory(filePath)) { |
| Slog.e(TAG, "Error while creating images directory for file: " + filePath); |
| continue; |
| } |
| final Bitmap bitmap = imageWriteQueueItem.mImage; |
| if (DEBUG) Slog.d(TAG, "writing bitmap: filename=" + filePath); |
| FileOutputStream imageFile = null; |
| try { |
| imageFile = new FileOutputStream(new File(filePath)); |
| bitmap.compress(Bitmap.CompressFormat.PNG, 100, imageFile); |
| } catch (Exception e) { |
| Slog.e(TAG, "saveImage: unable to save " + filePath, e); |
| } finally { |
| IoUtils.closeQuietly(imageFile); |
| } |
| } else if (item instanceof TaskWriteQueueItem) { |
| // Write out one task. |
| StringWriter stringWriter = null; |
| TaskRecord task = ((TaskWriteQueueItem) item).mTask; |
| if (DEBUG) Slog.d(TAG, "Writing task=" + task); |
| synchronized (mService) { |
| if (task.inRecents) { |
| // Still there. |
| try { |
| if (DEBUG) Slog.d(TAG, "Saving task=" + task); |
| stringWriter = saveToXml(task); |
| } catch (IOException e) { |
| } catch (XmlPullParserException e) { |
| } |
| } |
| } |
| if (stringWriter != null) { |
| // Write out xml file while not holding mService lock. |
| FileOutputStream file = null; |
| AtomicFile atomicFile = null; |
| try { |
| atomicFile = new AtomicFile(new File( |
| getUserTasksDir(task.userId), |
| String.valueOf(task.taskId) + RECENTS_FILENAME |
| + TASK_EXTENSION)); |
| file = atomicFile.startWrite(); |
| file.write(stringWriter.toString().getBytes()); |
| file.write('\n'); |
| atomicFile.finishWrite(file); |
| |
| } catch (IOException e) { |
| if (file != null) { |
| atomicFile.failWrite(file); |
| } |
| Slog.e(TAG, |
| "Unable to open " + atomicFile + " for persisting. " + e); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
