/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.server.wm;
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import android.annotation.Nullable;
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import android.app.ActivityManager.TaskSnapshot;
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import android.util.ArrayMap;
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import android.util.LruCache;
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import java.io.PrintWriter;
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import java.util.Map;
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import java.util.Map.Entry;
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/**
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* Caches snapshots. See {@link TaskSnapshotController}.
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* <p>
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* Access to this class should be guarded by the global window manager lock.
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*/
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class TaskSnapshotCache {
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private final WindowManagerService mService;
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private final TaskSnapshotLoader mLoader;
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private final ArrayMap<AppWindowToken, Integer> mAppTaskMap = new ArrayMap<>();
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private final ArrayMap<Integer, CacheEntry> mRunningCache = new ArrayMap<>();
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TaskSnapshotCache(WindowManagerService service, TaskSnapshotLoader loader) {
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mService = service;
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mLoader = loader;
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}
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void putSnapshot(Task task, TaskSnapshot snapshot) {
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final CacheEntry entry = mRunningCache.get(task.mTaskId);
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if (entry != null) {
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mAppTaskMap.remove(entry.topApp);
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}
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final AppWindowToken top = task.getTopChild();
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mAppTaskMap.put(top, task.mTaskId);
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mRunningCache.put(task.mTaskId, new CacheEntry(snapshot, task.getTopChild()));
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}
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/**
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* If {@param restoreFromDisk} equals {@code true}, DO NOT HOLD THE WINDOW MANAGER LOCK!
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*/
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@Nullable TaskSnapshot getSnapshot(int taskId, int userId, boolean restoreFromDisk,
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boolean reducedResolution) {
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synchronized (mService.mGlobalLock) {
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// Try the running cache.
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final CacheEntry entry = mRunningCache.get(taskId);
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if (entry != null) {
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return entry.snapshot;
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}
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}
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// Try to restore from disk if asked.
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if (!restoreFromDisk) {
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return null;
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}
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return tryRestoreFromDisk(taskId, userId, reducedResolution);
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}
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/**
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* DO NOT HOLD THE WINDOW MANAGER LOCK WHEN CALLING THIS METHOD!
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*/
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private TaskSnapshot tryRestoreFromDisk(int taskId, int userId, boolean reducedResolution) {
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final TaskSnapshot snapshot = mLoader.loadTask(taskId, userId, reducedResolution);
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if (snapshot == null) {
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return null;
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}
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return snapshot;
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}
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/**
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* Called when an app token has been removed
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*/
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void onAppRemoved(AppWindowToken wtoken) {
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final Integer taskId = mAppTaskMap.get(wtoken);
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if (taskId != null) {
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removeRunningEntry(taskId);
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}
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}
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/**
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* Callend when an app window token's process died.
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*/
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void onAppDied(AppWindowToken wtoken) {
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final Integer taskId = mAppTaskMap.get(wtoken);
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if (taskId != null) {
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removeRunningEntry(taskId);
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}
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}
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void onTaskRemoved(int taskId) {
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removeRunningEntry(taskId);
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}
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private void removeRunningEntry(int taskId) {
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final CacheEntry entry = mRunningCache.get(taskId);
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if (entry != null) {
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mAppTaskMap.remove(entry.topApp);
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mRunningCache.remove(taskId);
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}
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}
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void dump(PrintWriter pw, String prefix) {
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final String doublePrefix = prefix + " ";
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final String triplePrefix = doublePrefix + " ";
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pw.println(prefix + "SnapshotCache");
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for (int i = mRunningCache.size() - 1; i >= 0; i--) {
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final CacheEntry entry = mRunningCache.valueAt(i);
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pw.println(doublePrefix + "Entry taskId=" + mRunningCache.keyAt(i));
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pw.println(triplePrefix + "topApp=" + entry.topApp);
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pw.println(triplePrefix + "snapshot=" + entry.snapshot);
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}
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}
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private static final class CacheEntry {
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/** The snapshot. */
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final TaskSnapshot snapshot;
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/** The app token that was on top of the task when the snapshot was taken */
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final AppWindowToken topApp;
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CacheEntry(TaskSnapshot snapshot, AppWindowToken topApp) {
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this.snapshot = snapshot;
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this.topApp = topApp;
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}
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}
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}
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