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/*
* 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.systemui.shared.recents.model;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.HandlerThread;
import android.util.Log;
import com.android.systemui.shared.system.ActivityManagerWrapper;
import com.android.systemui.shared.system.PackageManagerWrapper;
/**
* Background task resource loader
*/
class BackgroundTaskLoader implements Runnable {
static String TAG = "BackgroundTaskLoader";
static boolean DEBUG = false;
private Context mContext;
private final HandlerThread mLoadThread;
private final Handler mLoadThreadHandler;
private final Handler mMainThreadHandler;
private final TaskResourceLoadQueue mLoadQueue;
private final TaskKeyLruCache<Drawable> mIconCache;
private final BitmapDrawable mDefaultIcon;
private boolean mStarted;
private boolean mCancelled;
private boolean mWaitingOnLoadQueue;
private final OnIdleChangedListener mOnIdleChangedListener;
/** Constructor, creates a new loading thread that loads task resources in the background */
public BackgroundTaskLoader(TaskResourceLoadQueue loadQueue,
TaskKeyLruCache<Drawable> iconCache, BitmapDrawable defaultIcon,
OnIdleChangedListener onIdleChangedListener) {
mLoadQueue = loadQueue;
mIconCache = iconCache;
mDefaultIcon = defaultIcon;
mMainThreadHandler = new Handler();
mOnIdleChangedListener = onIdleChangedListener;
mLoadThread = new HandlerThread("Recents-TaskResourceLoader",
android.os.Process.THREAD_PRIORITY_BACKGROUND);
mLoadThread.start();
mLoadThreadHandler = new Handler(mLoadThread.getLooper());
}
/** Restarts the loader thread */
void start(Context context) {
mContext = context;
mCancelled = false;
if (!mStarted) {
// Start loading on the load thread
mStarted = true;
mLoadThreadHandler.post(this);
} else {
// Notify the load thread to start loading again
synchronized (mLoadThread) {
mLoadThread.notifyAll();
}
}
}
/** Requests the loader thread to stop after the current iteration */
void stop() {
// Mark as cancelled for the thread to pick up
mCancelled = true;
// If we are waiting for the load queue for more tasks, then we can just reset the
// Context now, since nothing is using it
if (mWaitingOnLoadQueue) {
mContext = null;
}
}
@Override
public void run() {
while (true) {
if (mCancelled) {
// We have to unset the context here, since the background thread may be using it
// when we call stop()
mContext = null;
// If we are cancelled, then wait until we are started again
synchronized(mLoadThread) {
try {
mLoadThread.wait();
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
} else {
// If we've stopped the loader, then fall through to the above logic to wait on
// the load thread
processLoadQueueItem();
// If there are no other items in the list, then just wait until something is added
if (!mCancelled && mLoadQueue.isEmpty()) {
synchronized(mLoadQueue) {
try {
mWaitingOnLoadQueue = true;
mMainThreadHandler.post(
() -> mOnIdleChangedListener.onIdleChanged(true));
mLoadQueue.wait();
mMainThreadHandler.post(
() -> mOnIdleChangedListener.onIdleChanged(false));
mWaitingOnLoadQueue = false;
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
}
}
}
}
/**
* This needs to be in a separate method to work around an surprising interpreter behavior:
* The register will keep the local reference to cachedThumbnailData even if it falls out of
* scope. Putting it into a method fixes this issue.
*/
private void processLoadQueueItem() {
// Load the next item from the queue
final Task t = mLoadQueue.nextTask();
if (t != null) {
Drawable cachedIcon = mIconCache.get(t.key);
// Load the icon if it is stale or we haven't cached one yet
if (cachedIcon == null) {
cachedIcon = ActivityManagerWrapper.getInstance().getBadgedTaskDescriptionIcon(
mContext, t.taskDescription, t.key.userId, mContext.getResources());
if (cachedIcon == null) {
ActivityInfo info = PackageManagerWrapper.getInstance().getActivityInfo(
t.key.getComponent(), t.key.userId);
if (info != null) {
if (DEBUG) Log.d(TAG, "Loading icon: " + t.key);
cachedIcon = ActivityManagerWrapper.getInstance().getBadgedActivityIcon(
info, t.key.userId);
}
}
if (cachedIcon == null) {
cachedIcon = mDefaultIcon;
}
// At this point, even if we can't load the icon, we will set the
// default icon.
mIconCache.put(t.key, cachedIcon);
}
if (DEBUG) Log.d(TAG, "Loading thumbnail: " + t.key);
final ThumbnailData thumbnailData =
ActivityManagerWrapper.getInstance().getTaskThumbnail(t.key.id,
true /* reducedResolution */);
if (!mCancelled) {
// Notify that the task data has changed
final Drawable finalIcon = cachedIcon;
mMainThreadHandler.post(
() -> t.notifyTaskDataLoaded(thumbnailData, finalIcon));
}
}
}
interface OnIdleChangedListener {
void onIdleChanged(boolean idle);
}
}
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