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Removing third_party/android_async_task 

Bug: 825947
Change-Id: Id03b7c06a7173afb7b15e64eb91974735a979c0d
Reviewed-on: https://chromium-review.googlesource.com/1240514Reviewed-by: default avataragrieve <agrieve@chromium.org>
Commit-Queue: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593597}
parent dceee4ae
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third_party/android_async_task/LICENSE deleted 100644 → 0
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third_party/android_async_task/OWNERS deleted 100644 → 0
View file @ dceee4ae
agrieve@chromium.org
hartmanng@chromium.org
smaier@chromium.org
torne@chromium.org
wnwen@chromium.org
third_party/android_async_task/README.chromium deleted 100644 → 0
View file @ dceee4ae
Name: AsyncTask
URL: https://android.googlesource.com/platform/frameworks/base/+/oreo-release/core/java/android/os/AsyncTask.java
Version: 1488a3a19d4681a41fb45570c15e14d99db1cb66
License: Apache 2.0
License File: LICENSE
Security Critical: yes
Description:
This contains a copy of Android Oreo's AsyncTask.java.
Local Modifications:
- Renamed package to org.chromium.base.
- Explicitly import android.os objects.
- Switch to using android.support.annotations (from android.support.v13).
- Added annotations to help it compile issue-free.
- Changed THREAD_POOL_EXECUTOR to use our extension of Android's
ThreadPoolExecutor (which adds information about the work queue when it fills
up)
- Added function which shuts down Android's ThreadPoolExecutor, and rerouted
runnables sent to Android's ThreadPoolExecutor to our Executor.
- Changed SERIAL_EXECUTOR to reuse the executor from android.os.AsyncTask
- Removed Params, Progress generics
third_party/android_async_task/java/src/org/chromium/base/AsyncTask.java deleted 100644 → 0
View file @ dceee4ae
/*
* Copyright (C) 2008 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 org.chromium.base;
import android.os.Binder;
import android.os.Handler;
import android.os.Process;
import android.support.annotation.MainThread;
import android.support.annotation.WorkerThread;
import java.lang.reflect.Field;
import java.util.ArrayDeque;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.FutureTask;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
/**
* <p>AsyncTask enables proper and easy use of the UI thread. This class allows you
* to perform background operations and publish results on the UI thread without
* having to manipulate threads and/or handlers.</p>
*
* <p>AsyncTask is designed to be a helper class around {@link Thread} and {@link Handler}
* and does not constitute a generic threading framework. AsyncTasks should ideally be
* used for short operations (a few seconds at the most.) If you need to keep threads
* running for long periods of time, it is highly recommended you use the various APIs
* provided by the <code>java.util.concurrent</code> package such as {@link Executor},
* {@link ThreadPoolExecutor} and {@link FutureTask}.</p>
*
* <p>An asynchronous task is defined by a computation that runs on a background thread and
* whose result is published on the UI thread. An asynchronous task is defined by 1 generic
* type, called <code>Result</code>, and 3 steps, called <code>onPreExecute</code>,
* <code>doInBackground</code> and <code>onPostExecute</code>.</p>
*
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For more information about using tasks and threads, read the
* <a href="{@docRoot}guide/components/processes-and-threads.html">Processes and
* Threads</a> developer guide.</p>
* </div>
*
* <h2>Usage</h2>
* <p>AsyncTask must be subclassed to be used. The subclass will override at least
* one method ({@link #doInBackground}), and most often will override a
* second one ({@link #onPostExecute}.)</p>
*
* <p>Here is an example of subclassing:</p>
* <pre class="prettyprint">
* private class DownloadFilesTask extends AsyncTask&lt;Long&gt; {
* protected Long doInBackground() {
* int count = urls.length;
* long totalSize = 0;
* for (int i = 0; i < count; i++) {
* totalSize += Downloader.downloadFile(urls[i]);
* // Escape early if cancel() is called
* if (isCancelled()) break;
* }
* return totalSize;
* }
*
* protected void onPostExecute(Long result) {
* showDialog("Downloaded " + result + " bytes");
* }
* }
* </pre>
*
* <p>Once created, a task is executed very simply:</p>
* <pre class="prettyprint">
* new DownloadFilesTask().execute(url1, url2, url3);
* </pre>
*
* <h2>AsyncTask's generic types</h2>
* <p>The two types used by an asynchronous task are the following:</p>
* <ol>
* execution.</li>
* <li><code>Result</code>, the type of the result of the background
* computation.</li>
* </ol>
* <p>Not all types are always used by an asynchronous task. To mark a type as unused,
* simply use the type {@link Void}:</p>
* <pre>
* private class MyTask extends AsyncTask&lt;Void&gt; { ... }
* </pre>
*
* <h2>The 3 steps</h2>
* <p>When an asynchronous task is executed, the task goes through 3 steps:</p>
* <ol>
* <li>{@link #onPreExecute()}, invoked on the UI thread before the task
* is executed. This step is normally used to setup the task, for instance by
* showing a progress bar in the user interface.</li>
* <li>{@link #doInBackground}, invoked on the background thread
* immediately after {@link #onPreExecute()} finishes executing. This step is used
* to perform background computation that can take a long time.The result of the computation
* must be returned by this step and will be passed back to the last step.</li>
* <li>{@link #onPostExecute}, invoked on the UI thread after the background
* computation finishes. The result of the background computation is passed to
* this step as a parameter.</li>
* </ol>
*
* <h2>Cancelling a task</h2>
* <p>A task can be cancelled at any time by invoking {@link #cancel(boolean)}. Invoking
* this method will cause subsequent calls to {@link #isCancelled()} to return true.
* After invoking this method, {@link #onCancelled(Object)}, instead of
* {@link #onPostExecute(Object)} will be invoked after {@link #doInBackground()} returns. To ensure
* that a task is cancelled as quickly as possible, you should always check the return value of
* {@link #isCancelled()} periodically from {@link #doInBackground()}, if possible (inside a loop
* for instance.)</p>
*
* <h2>Threading rules</h2>
* <p>There are a few threading rules that must be followed for this class to
* work properly:</p>
* <ul>
* <li>The AsyncTask class must be loaded on the UI thread. This is done
* automatically as of {@link android.os.Build.VERSION_CODES#JELLY_BEAN}.</li>
* <li>The task instance must be created on the UI thread.</li>
* <li>{@link #executeOnExecutor(Executor)} must be invoked on the UI thread.</li>
* <li>Do not call {@link #onPreExecute()}, {@link #onPostExecute},
* {@link #doInBackground} manually.</li>
* <li>The task can be executed only once (an exception will be thrown if
* a second execution is attempted.)</li>
* </ul>
*
* <h2>Memory observability</h2>
* <p>AsyncTask guarantees that all callback calls are synchronized in such a way that the following
* operations are safe without explicit synchronizations.</p>
* <ul>
* <li>Set member fields in the constructor or {@link #onPreExecute}, and refer to them
* in {@link #doInBackground}.
* <li>Set member fields in {@link #doInBackground}, and refer to them in
* {@link #onPostExecute}.
* </ul>
*
* <h2>Order of execution</h2>
* <p>When first introduced, AsyncTasks were executed serially on a single background
* thread. Starting with {@link android.os.Build.VERSION_CODES#DONUT}, this was changed
* to a pool of threads allowing multiple tasks to operate in parallel. Starting with
* {@link android.os.Build.VERSION_CODES#HONEYCOMB}, tasks are executed on a single
* thread to avoid common application errors caused by parallel execution.</p>
* <p>If you truly want parallel execution, you can invoke
* {@link #executeOnExecutor(java.util.concurrent.Executor)} with
* {@link #THREAD_POOL_EXECUTOR}.</p>
*/
public abstract class AsyncTask<Result> {
private static final String TAG = "AsyncTask";
private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
// We want at least 2 threads and at most 4 threads in the core pool,
// preferring to have 1 less than the CPU count to avoid saturating
// the CPU with background work
private static final int CORE_POOL_SIZE = Math.max(2, Math.min(CPU_COUNT - 1, 4));
private static final int MAXIMUM_POOL_SIZE = CPU_COUNT * 2 + 1;
private static final int KEEP_ALIVE_SECONDS = 30;
private static final ThreadFactory sThreadFactory = new ThreadFactory() {
private final AtomicInteger mCount = new AtomicInteger(1);
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "CrAsyncTask #" + mCount.getAndIncrement());
}
};
private static final BlockingQueue<Runnable> sPoolWorkQueue =
new ArrayBlockingQueue<Runnable>(128);
/**
* An {@link Executor} that can be used to execute tasks in parallel.
*/
public static final Executor THREAD_POOL_EXECUTOR = new ChromeThreadPoolExecutor();
/**
* An {@link Executor} that executes tasks one at a time in serial
* order. This serialization is global to a particular process.
*/
public static final Executor SERIAL_EXECUTOR = new SerialExecutor();
private static final int MESSAGE_POST_RESULT = 0x1;
private static final int MESSAGE_POST_PROGRESS = 0x2;
private static final StealRunnableHandler STEAL_RUNNABLE_HANDLER = new StealRunnableHandler();
private final Callable<Result> mWorker;
private final FutureTask<Result> mFuture;
private volatile Status mStatus = Status.PENDING;
private final AtomicBoolean mCancelled = new AtomicBoolean();
private final AtomicBoolean mTaskInvoked = new AtomicBoolean();
public static class ChromeThreadPoolExecutor extends ThreadPoolExecutor {
// May have to be lowered if we are not capturing any Runnable sources.
private static final int RUNNABLE_WARNING_COUNT = 32;
ChromeThreadPoolExecutor() {
this(CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE_SECONDS, TimeUnit.SECONDS,
sPoolWorkQueue, sThreadFactory);
}
@VisibleForTesting
ChromeThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime,
TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory);
allowCoreThreadTimeOut(true);
}
@SuppressWarnings("NoAndroidAsyncTaskCheck")
private static String getClassName(Runnable runnable) {
Class blamedClass = runnable.getClass();
try {
if (blamedClass == AsyncTask.NamedFutureTask.class) {
blamedClass = ((AsyncTask.NamedFutureTask) runnable).getBlamedClass();
} else if (blamedClass.getEnclosingClass() == android.os.AsyncTask.class) {
// This gets the AsyncTask that produced the runnable.
Field field = blamedClass.getDeclaredField("this$0");
field.setAccessible(true);
blamedClass = field.get(runnable).getClass();
}
} catch (NoSuchFieldException e) {
if (BuildConfig.DCHECK_IS_ON) {
throw new RuntimeException(e);
}
} catch (IllegalAccessException e) {
if (BuildConfig.DCHECK_IS_ON) {
throw new RuntimeException(e);
}
}
return blamedClass.getName();
}
private Map<String, Integer> getNumberOfClassNameOccurrencesInQueue() {
Map<String, Integer> counts = new HashMap<>();
Runnable[] copiedQueue = getQueue().toArray(new Runnable[0]);
for (Runnable runnable : copiedQueue) {
String className = getClassName(runnable);
int count = counts.containsKey(className) ? counts.get(className) : 0;
counts.put(className, count + 1);
}
return counts;
}
private String findClassNamesWithTooManyRunnables(Map<String, Integer> counts) {
// We only show the classes over RUNNABLE_WARNING_COUNT appearances so that these
// crashes group up together in the reporting dashboards. If we were to print all
// the Runnables or their counts, this would fragment the reporting, with one for
// each unique set of Runnables/counts.
StringBuilder classesWithTooManyRunnables = new StringBuilder();
for (Map.Entry<String, Integer> entry : counts.entrySet()) {
if (entry.getValue() > RUNNABLE_WARNING_COUNT) {
classesWithTooManyRunnables.append(entry.getKey()).append(' ');
}
}
if (classesWithTooManyRunnables.length() == 0) {
return "NO CLASSES FOUND";
}
return classesWithTooManyRunnables.toString();
}
@Override
public void execute(Runnable command) {
try {
super.execute(command);
} catch (RejectedExecutionException e) {
Map<String, Integer> counts = getNumberOfClassNameOccurrencesInQueue();
throw new RejectedExecutionException("Prominent classes in AsyncTask: "
+ findClassNamesWithTooManyRunnables(counts),
e);
}
}
}
private static class SerialExecutor implements Executor {
final ArrayDeque<Runnable> mTasks = new ArrayDeque<Runnable>();
Runnable mActive;
@Override
public synchronized void execute(final Runnable r) {
mTasks.offer(new Runnable() {
@Override
public void run() {
try {
r.run();
} finally {
scheduleNext();
}
}
});
if (mActive == null) {
scheduleNext();
}
}
protected synchronized void scheduleNext() {
if ((mActive = mTasks.poll()) != null) {
THREAD_POOL_EXECUTOR.execute(mActive);
}
}
}
private static class StealRunnableHandler implements RejectedExecutionHandler {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
THREAD_POOL_EXECUTOR.execute(r);
}
}
/**
* Indicates the current status of the task. Each status will be set only once
* during the lifetime of a task.
*/
public enum Status {
/**
* Indicates that the task has not been executed yet.
*/
PENDING,
/**
* Indicates that the task is running.
*/
RUNNING,
/**
* Indicates that {@link AsyncTask#onPostExecute} has finished.
*/
FINISHED,
}
@SuppressWarnings("NoAndroidAsyncTaskCheck")
public static void takeOverAndroidThreadPool() {
ThreadPoolExecutor exec = (ThreadPoolExecutor) android.os.AsyncTask.THREAD_POOL_EXECUTOR;
exec.setRejectedExecutionHandler(STEAL_RUNNABLE_HANDLER);
exec.shutdown();
}
/**
* Creates a new asynchronous task. This constructor must be invoked on the UI thread.
*/
public AsyncTask() {
mWorker = new Callable<Result>() {
@Override
public Result call() throws Exception {
mTaskInvoked.set(true);
Result result = null;
try {
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
result = doInBackground();
Binder.flushPendingCommands();
} catch (Throwable tr) {
mCancelled.set(true);
throw tr;
} finally {
postResult(result);
}
return result;
}
};
mFuture = new NamedFutureTask(mWorker);
}
private void postResultIfNotInvoked(Result result) {
final boolean wasTaskInvoked = mTaskInvoked.get();
if (!wasTaskInvoked) {
postResult(result);
}
}
private void postResult(Result result) {
ThreadUtils.postOnUiThread(() -> { finish(result); });
}
/**
* Returns the current status of this task.
*
* @return The current status.
*/
public final Status getStatus() {
return mStatus;
}
/**
* Override this method to perform a computation on a background thread.
*
* @return A result, defined by the subclass of this task.
*
* @see #onPreExecute()
* @see #onPostExecute
*/
@WorkerThread
protected abstract Result doInBackground();
/**
* Runs on the UI thread before {@link #doInBackground}.
*
* @see #onPostExecute
* @see #doInBackground
*/
@MainThread
protected void onPreExecute() {}
/**
* <p>Runs on the UI thread after {@link #doInBackground}. The
* specified result is the value returned by {@link #doInBackground}.</p>
*
* <p>This method won't be invoked if the task was cancelled.</p>
*
* @param result The result of the operation computed by {@link #doInBackground}.
*
* @see #onPreExecute
* @see #doInBackground
* @see #onCancelled(Object)
*/
@SuppressWarnings({"UnusedDeclaration"})
@MainThread
protected void onPostExecute(Result result) {}
/**
* <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
* {@link #doInBackground()} has finished.</p>
*
* <p>The default implementation simply invokes {@link #onCancelled()} and
* ignores the result. If you write your own implementation, do not call
* <code>super.onCancelled(result)</code>.</p>
*
* @param result The result, if any, computed in
* {@link #doInBackground()}, can be null
*
* @see #cancel(boolean)
* @see #isCancelled()
*/
@SuppressWarnings({"UnusedParameters"})
@MainThread
protected void onCancelled(Result result) {
onCancelled();
}
/**
* <p>Applications should preferably override {@link #onCancelled(Object)}.
* This method is invoked by the default implementation of
* {@link #onCancelled(Object)}.</p>
*
* <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
* {@link #doInBackground()} has finished.</p>
*
* @see #onCancelled(Object)
* @see #cancel(boolean)
* @see #isCancelled()
*/
@MainThread
protected void onCancelled() {}
/**
* Returns <tt>true</tt> if this task was cancelled before it completed
* normally. If you are calling {@link #cancel(boolean)} on the task,
* the value returned by this method should be checked periodically from
* {@link #doInBackground()} to end the task as soon as possible.
*
* @return <tt>true</tt> if task was cancelled before it completed
*
* @see #cancel(boolean)
*/
public final boolean isCancelled() {
return mCancelled.get();
}
/**
* <p>Attempts to cancel execution of this task. This attempt will
* fail if the task has already completed, already been cancelled,
* or could not be cancelled for some other reason. If successful,
* and this task has not started when <tt>cancel</tt> is called,
* this task should never run. If the task has already started,
* then the <tt>mayInterruptIfRunning</tt> parameter determines
* whether the thread executing this task should be interrupted in
* an attempt to stop the task.</p>
*
* <p>Calling this method will result in {@link #onCancelled(Object)} being
* invoked on the UI thread after {@link #doInBackground()}
* returns. Calling this method guarantees that {@link #onPostExecute(Object)}
* is never invoked. After invoking this method, you should check the
* value returned by {@link #isCancelled()} periodically from
* {@link #doInBackground()} to finish the task as early as
* possible.</p>
*
* @param mayInterruptIfRunning <tt>true</tt> if the thread executing this
* task should be interrupted; otherwise, in-progress tasks are allowed
* to complete.
*
* @return <tt>false</tt> if the task could not be cancelled,
* typically because it has already completed normally;
* <tt>true</tt> otherwise
*
* @see #isCancelled()
* @see #onCancelled(Object)
*/
public final boolean cancel(boolean mayInterruptIfRunning) {
mCancelled.set(true);
return mFuture.cancel(mayInterruptIfRunning);
}
/**
* Waits if necessary for the computation to complete, and then
* retrieves its result.
*
* TODO(smaier): Don't inline so that stack traces can be read easily for tracing once in base/.
*
* @return The computed result.
*
* @throws CancellationException If the computation was cancelled.
* @throws ExecutionException If the computation threw an exception.
* @throws InterruptedException If the current thread was interrupted
* while waiting.
*/
public final Result get() throws InterruptedException, ExecutionException {
Result r;
if (getStatus() != Status.FINISHED && ThreadUtils.runningOnUiThread()) {
StackTraceElement[] stackTrace = new Exception().getStackTrace();
String caller = "";
if (stackTrace.length > 1) {
caller = stackTrace[1].getClassName() + '.' + stackTrace[1].getMethodName() + '.';
}
try (TraceEvent e = TraceEvent.scoped(caller + "AsyncTask.get")) {
r = mFuture.get();
}
} else {
r = mFuture.get();
}
return r;
}
/**
* Waits if necessary for at most the given time for the computation
* to complete, and then retrieves its result.
*
* @param timeout Time to wait before cancelling the operation.
* @param unit The time unit for the timeout.
*
* @return The computed result.
*
* @throws CancellationException If the computation was cancelled.
* @throws ExecutionException If the computation threw an exception.
* @throws InterruptedException If the current thread was interrupted
* while waiting.
* @throws TimeoutException If the wait timed out.
*/
public final Result get(long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
return mFuture.get(timeout, unit);
}
/**
* Executes the task with the specified parameters. The task returns
* itself (this) so that the caller can keep a reference to it.
*
* <p>This method is typically used with {@link #THREAD_POOL_EXECUTOR} to
* allow multiple tasks to run in parallel on a pool of threads managed by
* AsyncTask, however you can also use your own {@link Executor} for custom
* behavior.
*
* <p><em>Warning:</em> Allowing multiple tasks to run in parallel from
* a thread pool is generally <em>not</em> what one wants, because the order
* of their operation is not defined. For example, if these tasks are used
* to modify any state in common (such as writing a file due to a button click),
* there are no guarantees on the order of the modifications.
* Without careful work it is possible in rare cases for the newer version
* of the data to be over-written by an older one, leading to obscure data
* loss and stability issues. Such changes are best
* executed in serial; to guarantee such work is serialized regardless of
* platform version you can use this function with {@link #SERIAL_EXECUTOR}.
*
* <p>This method must be invoked on the UI thread.
*
* @param exec The executor to use. {@link #THREAD_POOL_EXECUTOR} is available as a
* convenient process-wide thread pool for tasks that are loosely coupled.
*
* @return This instance of AsyncTask.
*
* @throws IllegalStateException If {@link #getStatus()} returns either
* {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
*/
@SuppressWarnings({"MissingCasesInEnumSwitch"})
@MainThread
public final AsyncTask<Result> executeOnExecutor(Executor exec) {
if (mStatus != Status.PENDING) {
switch (mStatus) {
case RUNNING:
throw new IllegalStateException("Cannot execute task:"
+ " the task is already running.");
case FINISHED:
throw new IllegalStateException("Cannot execute task:"
+ " the task has already been executed "
+ "(a task can be executed only once)");
}
}
mStatus = Status.RUNNING;
onPreExecute();
exec.execute(mFuture);
return this;
}
private void finish(Result result) {
if (isCancelled()) {
onCancelled(result);
} else {
onPostExecute(result);
}
mStatus = Status.FINISHED;
}
private class NamedFutureTask extends FutureTask<Result> {
NamedFutureTask(Callable<Result> c) {
super(c);
}
Class getBlamedClass() {
return AsyncTask.this.getClass();
}
@Override
protected void done() {
try {
postResultIfNotInvoked(get());
} catch (InterruptedException e) {
android.util.Log.w(TAG, e);
} catch (ExecutionException e) {
throw new RuntimeException(
"An error occurred while executing doInBackground()", e.getCause());
} catch (CancellationException e) {
postResultIfNotInvoked(null);
}
}
}
}
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