| /* |
| * 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.server.wm; |
| |
| import static android.graphics.Bitmap.CompressFormat.*; |
| import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME; |
| import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM; |
| |
| import android.annotation.TestApi; |
| import android.app.ActivityManager.TaskSnapshot; |
| import android.graphics.Bitmap; |
| import android.graphics.Bitmap.CompressFormat; |
| import android.graphics.Bitmap.Config; |
| import android.os.Process; |
| import android.os.SystemClock; |
| import android.util.ArraySet; |
| import android.util.Slog; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.os.AtomicFile; |
| import com.android.server.wm.nano.WindowManagerProtos.TaskSnapshotProto; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.util.ArrayDeque; |
| |
| /** |
| * Persists {@link TaskSnapshot}s to disk. |
| * <p> |
| * Test class: {@link TaskSnapshotPersisterLoaderTest} |
| */ |
| class TaskSnapshotPersister { |
| |
| private static final String TAG = TAG_WITH_CLASS_NAME ? "TaskSnapshotPersister" : TAG_WM; |
| private static final String SNAPSHOTS_DIRNAME = "snapshots"; |
| private static final String REDUCED_POSTFIX = "_reduced"; |
| static final float REDUCED_SCALE = 0.5f; |
| private static final long DELAY_MS = 100; |
| private static final int QUALITY = 95; |
| private static final String PROTO_EXTENSION = ".proto"; |
| private static final String BITMAP_EXTENSION = ".jpg"; |
| |
| @GuardedBy("mLock") |
| private final ArrayDeque<WriteQueueItem> mWriteQueue = new ArrayDeque<>(); |
| @GuardedBy("mLock") |
| private boolean mQueueIdling; |
| private boolean mStarted; |
| private final Object mLock = new Object(); |
| private final DirectoryResolver mDirectoryResolver; |
| |
| /** |
| * The list of ids of the tasks that have been persisted since {@link #removeObsoleteFiles} was |
| * called. |
| */ |
| @GuardedBy("mLock") |
| private final ArraySet<Integer> mPersistedTaskIdsSinceLastRemoveObsolete = new ArraySet<>(); |
| |
| TaskSnapshotPersister(DirectoryResolver resolver) { |
| mDirectoryResolver = resolver; |
| } |
| |
| /** |
| * Starts persisting. |
| */ |
| void start() { |
| if (!mStarted) { |
| mStarted = true; |
| mPersister.start(); |
| } |
| } |
| |
| /** |
| * Persists a snapshot of a task to disk. |
| * |
| * @param taskId The id of the task that needs to be persisted. |
| * @param userId The id of the user this tasks belongs to. |
| * @param snapshot The snapshot to persist. |
| */ |
| void persistSnapshot(int taskId, int userId, TaskSnapshot snapshot) { |
| synchronized (mLock) { |
| mPersistedTaskIdsSinceLastRemoveObsolete.add(taskId); |
| sendToQueueLocked(new StoreWriteQueueItem(taskId, userId, snapshot)); |
| } |
| } |
| |
| /** |
| * Callend when a task has been removed. |
| * |
| * @param taskId The id of task that has been removed. |
| * @param userId The id of the user the task belonged to. |
| */ |
| void onTaskRemovedFromRecents(int taskId, int userId) { |
| synchronized (mLock) { |
| mPersistedTaskIdsSinceLastRemoveObsolete.remove(taskId); |
| sendToQueueLocked(new DeleteWriteQueueItem(taskId, userId)); |
| } |
| } |
| |
| /** |
| * In case a write/delete operation was lost because the system crashed, this makes sure to |
| * clean up the directory to remove obsolete files. |
| * |
| * @param persistentTaskIds A set of task ids that exist in our in-memory model. |
| * @param runningUserIds The ids of the list of users that have tasks loaded in our in-memory |
| * model. |
| */ |
| void removeObsoleteFiles(ArraySet<Integer> persistentTaskIds, int[] runningUserIds) { |
| synchronized (mLock) { |
| mPersistedTaskIdsSinceLastRemoveObsolete.clear(); |
| sendToQueueLocked(new RemoveObsoleteFilesQueueItem(persistentTaskIds, runningUserIds)); |
| } |
| } |
| |
| @TestApi |
| void waitForQueueEmpty() { |
| while (true) { |
| synchronized (mLock) { |
| if (mWriteQueue.isEmpty() && mQueueIdling) { |
| return; |
| } |
| } |
| SystemClock.sleep(100); |
| } |
| } |
| |
| @GuardedBy("mLock") |
| private void sendToQueueLocked(WriteQueueItem item) { |
| mWriteQueue.offer(item); |
| mLock.notifyAll(); |
| } |
| |
| private File getDirectory(int userId) { |
| return new File(mDirectoryResolver.getSystemDirectoryForUser(userId), SNAPSHOTS_DIRNAME); |
| } |
| |
| File getProtoFile(int taskId, int userId) { |
| return new File(getDirectory(userId), taskId + PROTO_EXTENSION); |
| } |
| |
| File getBitmapFile(int taskId, int userId) { |
| return new File(getDirectory(userId), taskId + BITMAP_EXTENSION); |
| } |
| |
| File getReducedResolutionBitmapFile(int taskId, int userId) { |
| return new File(getDirectory(userId), taskId + REDUCED_POSTFIX + BITMAP_EXTENSION); |
| } |
| |
| private boolean createDirectory(int userId) { |
| final File dir = getDirectory(userId); |
| return dir.exists() || dir.mkdirs(); |
| } |
| |
| private void deleteSnapshot(int taskId, int userId) { |
| final File protoFile = getProtoFile(taskId, userId); |
| final File bitmapFile = getBitmapFile(taskId, userId); |
| final File bitmapReducedFile = getReducedResolutionBitmapFile(taskId, userId); |
| protoFile.delete(); |
| bitmapFile.delete(); |
| bitmapReducedFile.delete(); |
| } |
| |
| interface DirectoryResolver { |
| File getSystemDirectoryForUser(int userId); |
| } |
| |
| private Thread mPersister = new Thread("TaskSnapshotPersister") { |
| public void run() { |
| android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); |
| while (true) { |
| WriteQueueItem next; |
| synchronized (mLock) { |
| next = mWriteQueue.poll(); |
| } |
| if (next != null) { |
| next.write(); |
| SystemClock.sleep(DELAY_MS); |
| } |
| synchronized (mLock) { |
| if (!mWriteQueue.isEmpty()) { |
| continue; |
| } |
| try { |
| mQueueIdling = true; |
| mLock.wait(); |
| mQueueIdling = false; |
| } catch (InterruptedException e) { |
| } |
| } |
| } |
| } |
| }; |
| |
| private abstract class WriteQueueItem { |
| abstract void write(); |
| } |
| |
| private class StoreWriteQueueItem extends WriteQueueItem { |
| private final int mTaskId; |
| private final int mUserId; |
| private final TaskSnapshot mSnapshot; |
| |
| StoreWriteQueueItem(int taskId, int userId, TaskSnapshot snapshot) { |
| mTaskId = taskId; |
| mUserId = userId; |
| mSnapshot = snapshot; |
| } |
| |
| @Override |
| void write() { |
| if (!createDirectory(mUserId)) { |
| Slog.e(TAG, "Unable to create snapshot directory for user dir=" |
| + getDirectory(mUserId)); |
| } |
| boolean failed = false; |
| if (!writeProto()) { |
| failed = true; |
| } |
| if (!writeBuffer()) { |
| writeBuffer(); |
| failed = true; |
| } |
| if (failed) { |
| deleteSnapshot(mTaskId, mUserId); |
| } |
| } |
| |
| boolean writeProto() { |
| final TaskSnapshotProto proto = new TaskSnapshotProto(); |
| proto.orientation = mSnapshot.getOrientation(); |
| proto.insetLeft = mSnapshot.getContentInsets().left; |
| proto.insetTop = mSnapshot.getContentInsets().top; |
| proto.insetRight = mSnapshot.getContentInsets().right; |
| proto.insetBottom = mSnapshot.getContentInsets().bottom; |
| final byte[] bytes = TaskSnapshotProto.toByteArray(proto); |
| final File file = getProtoFile(mTaskId, mUserId); |
| final AtomicFile atomicFile = new AtomicFile(file); |
| FileOutputStream fos = null; |
| try { |
| fos = atomicFile.startWrite(); |
| fos.write(bytes); |
| atomicFile.finishWrite(fos); |
| } catch (IOException e) { |
| atomicFile.failWrite(fos); |
| Slog.e(TAG, "Unable to open " + file + " for persisting. " + e); |
| return false; |
| } |
| return true; |
| } |
| |
| boolean writeBuffer() { |
| final File file = getBitmapFile(mTaskId, mUserId); |
| final File reducedFile = getReducedResolutionBitmapFile(mTaskId, mUserId); |
| final Bitmap bitmap = Bitmap.createHardwareBitmap(mSnapshot.getSnapshot()); |
| final Bitmap swBitmap = bitmap.copy(Config.ARGB_8888, false /* isMutable */); |
| final Bitmap reduced = Bitmap.createScaledBitmap(swBitmap, |
| (int) (bitmap.getWidth() * REDUCED_SCALE), |
| (int) (bitmap.getHeight() * REDUCED_SCALE), true /* filter */); |
| try { |
| FileOutputStream fos = new FileOutputStream(file); |
| swBitmap.compress(JPEG, QUALITY, fos); |
| fos.close(); |
| FileOutputStream reducedFos = new FileOutputStream(reducedFile); |
| reduced.compress(JPEG, QUALITY, reducedFos); |
| reducedFos.close(); |
| } catch (IOException e) { |
| Slog.e(TAG, "Unable to open " + file + " or " + reducedFile +" for persisting.", e); |
| return false; |
| } |
| return true; |
| } |
| } |
| |
| private class DeleteWriteQueueItem extends WriteQueueItem { |
| private final int mTaskId; |
| private final int mUserId; |
| |
| DeleteWriteQueueItem(int taskId, int userId) { |
| mTaskId = taskId; |
| mUserId = userId; |
| } |
| |
| @Override |
| void write() { |
| deleteSnapshot(mTaskId, mUserId); |
| } |
| } |
| |
| @VisibleForTesting |
| class RemoveObsoleteFilesQueueItem extends WriteQueueItem { |
| private final ArraySet<Integer> mPersistentTaskIds; |
| private final int[] mRunningUserIds; |
| |
| @VisibleForTesting |
| RemoveObsoleteFilesQueueItem(ArraySet<Integer> persistentTaskIds, |
| int[] runningUserIds) { |
| mPersistentTaskIds = persistentTaskIds; |
| mRunningUserIds = runningUserIds; |
| } |
| |
| @Override |
| void write() { |
| final ArraySet<Integer> newPersistedTaskIds; |
| synchronized (mLock) { |
| newPersistedTaskIds = new ArraySet<>(mPersistedTaskIdsSinceLastRemoveObsolete); |
| } |
| for (int userId : mRunningUserIds) { |
| final File dir = getDirectory(userId); |
| final String[] files = dir.list(); |
| if (files == null) { |
| continue; |
| } |
| for (String file : files) { |
| final int taskId = getTaskId(file); |
| if (!mPersistentTaskIds.contains(taskId) |
| && !newPersistedTaskIds.contains(taskId)) { |
| new File(dir, file).delete(); |
| } |
| } |
| } |
| } |
| |
| @VisibleForTesting |
| int getTaskId(String fileName) { |
| if (!fileName.endsWith(PROTO_EXTENSION) && !fileName.endsWith(BITMAP_EXTENSION)) { |
| return -1; |
| } |
| final int end = fileName.lastIndexOf('.'); |
| if (end == -1) { |
| return -1; |
| } |
| String name = fileName.substring(0, end); |
| if (name.endsWith(REDUCED_POSTFIX)) { |
| name = name.substring(0, name.length() - REDUCED_POSTFIX.length()); |
| } |
| try { |
| return Integer.parseInt(name); |
| } catch (NumberFormatException e) { |
| return -1; |
| } |
| } |
| } |
| } |