<NME> AsyncTask.java
<BEF> ADDFILE
<MSG> Issue 545: pulled AsyncTask contribution from Christoph Keller.
	Change on 2015/06/22 by tball <tball@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=96582842

<DFF> @@ -0,0 +1,640 @@
+/*
+ * 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.
+ */
+
+/*-[
+#include <dispatch/dispatch.h>
+]-*/
+
+package android.os;
+
+import java.util.ArrayDeque;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.Callable;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.Executor;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.FutureTask;
+import java.util.concurrent.LinkedBlockingQueue;
+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 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 3 generic
+ * types, called <code>Params</code>, <code>Progress</code> and <code>Result</code>,
+ * and 4 steps, called <code>onPreExecute</code>, <code>doInBackground</code>,
+ * <code>onProgressUpdate</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/topics/fundamentals/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;URL, Integer, Long&gt; {
+ *     protected Long doInBackground(URL... urls) {
+ *         int count = urls.length;
+ *         long totalSize = 0;
+ *         for (int i = 0; i < count; i++) {
+ *             totalSize += Downloader.downloadFile(urls[i]);
+ *             publishProgress((int) ((i / (float) count) * 100));
+ *             // Escape early if cancel() is called
+ *             if (isCancelled()) break;
+ *         }
+ *         return totalSize;
+ *     }
+ *
+ *     protected void onProgressUpdate(Integer... progress) {
+ *         setProgressPercent(progress[0]);
+ *     }
+ *
+ *     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 three types used by an asynchronous task are the following:</p>
+ * <ol>
+ *     <li><code>Params</code>, the type of the parameters sent to the task upon
+ *     execution.</li>
+ *     <li><code>Progress</code>, the type of the progress units published during
+ *     the background computation.</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, Void, Void&gt; { ... }
+ * </pre>
+ *
+ * <h2>The 4 steps</h2>
+ * <p>When an asynchronous task is executed, the task goes through 4 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 parameters
+ *     of the asynchronous task are passed to this step. The result of the computation must
+ *     be returned by this step and will be passed back to the last step. This step
+ *     can also use {@link #publishProgress} to publish one or more units
+ *     of progress. These values are published on the UI thread, in the
+ *     {@link #onProgressUpdate} step.</li>
+ *     <li>{@link #onProgressUpdate}, invoked on the UI thread after a
+ *     call to {@link #publishProgress}. The timing of the execution is
+ *     undefined. This method is used to display any form of progress in the user
+ *     interface while the background computation is still executing. For instance,
+ *     it can be used to animate a progress bar or show logs in a text field.</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(Object[])}
+ * 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(Object[])}, 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 #execute} must be invoked on the UI thread.</li>
+ *     <li>Do not call {@link #onPreExecute()}, {@link #onPostExecute},
+ *     {@link #doInBackground}, {@link #onProgressUpdate} 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 #onProgressUpdate} and {@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, Object[])} with
+ * {@link #THREAD_POOL_EXECUTOR}.</p>
+ */
+public abstract class AsyncTask<Params, Progress, Result> {
+    private static final String LOG_TAG = "AsyncTask";
+
+    private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
+    private static final int CORE_POOL_SIZE = CPU_COUNT + 1;
+    private static final int MAXIMUM_POOL_SIZE = CPU_COUNT * 2 + 1;
+    private static final int KEEP_ALIVE = 1;
+
+    private static final ThreadFactory sThreadFactory = new ThreadFactory() {
+        private final AtomicInteger mCount = new AtomicInteger(1);
+
+        public Thread newThread(Runnable r) {
+            return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());
+        }
+    };
+
+    private static final BlockingQueue<Runnable> sPoolWorkQueue =
+            new LinkedBlockingQueue<Runnable>(128);
+
+    /**
+     * An {@link Executor} that can be used to execute tasks in parallel.
+     */
+    public static final Executor THREAD_POOL_EXECUTOR
+            = new ThreadPoolExecutor(CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE,
+                    TimeUnit.SECONDS, sPoolWorkQueue, sThreadFactory);
+
+    /**
+     * 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 volatile Executor sDefaultExecutor = SERIAL_EXECUTOR;
+
+    private final WorkerRunnable<Params, 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();
+
+    private static class SerialExecutor implements Executor {
+        final ArrayDeque<Runnable> mTasks = new ArrayDeque<Runnable>();
+        Runnable mActive;
+
+        public synchronized void execute(final Runnable r) {
+            mTasks.offer(new Runnable() {
+                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);
+            }
+        }
+    }
+
+    /**
+     * 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,
+    }
+
+    /** @hide */
+    public static void setDefaultExecutor(Executor exec) {
+        sDefaultExecutor = exec;
+    }
+
+    /**
+     * Creates a new asynchronous task. This constructor must be invoked on the UI thread.
+     */
+    public AsyncTask() {
+        mWorker = new WorkerRunnable<Params, Result>() {
+            public Result call() throws Exception {
+                mTaskInvoked.set(true);
+
+                Thread.currentThread().setPriority(Thread.NORM_PRIORITY - 1);
+                //noinspection unchecked
+                return postResult(doInBackground(mParams));
+            }
+        };
+
+        mFuture = new FutureTask<Result>(mWorker) {
+            @Override
+            protected void done() {
+                try {
+                    postResultIfNotInvoked(get());
+                } catch (InterruptedException e) {
+                    android.util.Log.w(LOG_TAG, e);
+                } catch (ExecutionException e) {
+                    throw new RuntimeException("An error occured while executing doInBackground()",
+                            e.getCause());
+                } catch (CancellationException e) {
+                    postResultIfNotInvoked(null);
+                }
+            }
+        };
+    }
+
+    private void postResultIfNotInvoked(Result result) {
+        final boolean wasTaskInvoked = mTaskInvoked.get();
+        if (!wasTaskInvoked) {
+            postResult(result);
+        }
+    }
+
+    private native Result postResult(Result result) /*-[
+        AndroidOsAsyncTask __block *blockSelf = self;
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [blockSelf finishWithId:result];
+        });
+        return 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. The
+     * specified parameters are the parameters passed to {@link #execute}
+     * by the caller of this task.
+     *
+     * This method can call {@link #publishProgress} to publish updates
+     * on the UI thread.
+     *
+     * @param params The parameters of the task.
+     *
+     * @return A result, defined by the subclass of this task.
+     *
+     * @see #onPreExecute()
+     * @see #onPostExecute
+     * @see #publishProgress
+     */
+    protected abstract Result doInBackground(Params... params);
+
+    /**
+     * Runs on the UI thread before {@link #doInBackground}.
+     *
+     * @see #onPostExecute
+     * @see #doInBackground
+     */
+    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"})
+    protected void onPostExecute(Result result) {
+    }
+
+    /**
+     * Runs on the UI thread after {@link #publishProgress} is invoked.
+     * The specified values are the values passed to {@link #publishProgress}.
+     *
+     * @param values The values indicating progress.
+     *
+     * @see #publishProgress
+     * @see #doInBackground
+     */
+    @SuppressWarnings({"UnusedDeclaration"})
+    protected void onProgressUpdate(Progress... values) {
+    }
+
+    /**
+     * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
+     * {@link #doInBackground(Object[])} 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(Object[])}, can be null
+     *
+     * @see #cancel(boolean)
+     * @see #isCancelled()
+     */
+    @SuppressWarnings({"UnusedParameters"})
+    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(Object[])} has finished.</p>
+     *
+     * @see #onCancelled(Object)
+     * @see #cancel(boolean)
+     * @see #isCancelled()
+     */
+    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(Object[])} 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(Object[])}
+     * 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(Object[])} 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.
+     *
+     * @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 {
+        return mFuture.get();
+    }
+
+    /**
+     * 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>Note: this function schedules the task on a queue for a single background
+     * thread or pool of threads depending on the platform version.  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
+     * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, tasks are back to being
+     * executed on a single thread to avoid common application errors caused
+     * by parallel execution.  If you truly want parallel execution, you can use
+     * the {@link #executeOnExecutor} version of this method
+     * with {@link #THREAD_POOL_EXECUTOR}; however, see commentary there for warnings
+     * on its use.
+     *
+     * <p>This method must be invoked on the UI thread.
+     *
+     * @param params The parameters of the task.
+     *
+     * @return This instance of AsyncTask.
+     *
+     * @throws IllegalStateException If {@link #getStatus()} returns either
+     *         {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
+     *
+     * @see #executeOnExecutor(java.util.concurrent.Executor, Object[])
+     * @see #execute(Runnable)
+     */
+    public final AsyncTask<Params, Progress, Result> execute(Params... params) {
+        return executeOnExecutor(sDefaultExecutor, params);
+    }
+
+    /**
+     * 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.
+     * @param params The parameters of the task.
+     *
+     * @return This instance of AsyncTask.
+     *
+     * @throws IllegalStateException If {@link #getStatus()} returns either
+     *         {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
+     *
+     * @see #execute(Object[])
+     */
+    public final AsyncTask<Params, Progress, Result> executeOnExecutor(Executor exec,
+            Params... params) {
+        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();
+
+        mWorker.mParams = params;
+        exec.execute(mFuture);
+
+        return this;
+    }
+
+    /**
+     * Convenience version of {@link #execute(Object...)} for use with
+     * a simple Runnable object. See {@link #execute(Object[])} for more
+     * information on the order of execution.
+     *
+     * @see #execute(Object[])
+     * @see #executeOnExecutor(java.util.concurrent.Executor, Object[])
+     */
+    public static void execute(Runnable runnable) {
+        sDefaultExecutor.execute(runnable);
+    }
+
+    /**
+     * This method can be invoked from {@link #doInBackground} to
+     * publish updates on the UI thread while the background computation is
+     * still running. Each call to this method will trigger the execution of
+     * {@link #onProgressUpdate} on the UI thread.
+     *
+     * {@link #onProgressUpdate} will not be called if the task has been
+     * canceled.
+     *
+     * @param values The progress values to update the UI with.
+     *
+     * @see #onProgressUpdate
+     * @see #doInBackground
+     */
+    protected native final void publishProgress(Progress... values) /*-[
+        if (!AndroidOsAsyncTask_isCancelled(self)) {
+            AndroidOsAsyncTask __block *blockSelf = self;
+            dispatch_async(dispatch_get_main_queue(), ^{
+                [blockSelf onProgressUpdateWithNSObjectArray:values];
+            });
+        }
+    ]-*/;
+
+    private void finish(Result result) {
+        if (isCancelled()) {
+            onCancelled(result);
+        } else {
+            onPostExecute(result);
+        }
+        mStatus = Status.FINISHED;
+    }
+
+    private static abstract class WorkerRunnable<Params, Result> implements Callable<Result> {
+        Params[] mParams;
+    }
+}

{'addition_count': 640, 'commit_subject': 'Issue 545: pulled AsyncTask contribution from Christoph Keller. \tChange on 2015/06/22 by tball <tball@google.com> ------------- Created by MOE: http://code.google.com/p/moe-java MOE_MIGRATED_REVID=96582842', 'deletion_count': 0, 'file_extension': '.java', 'lang': 'java', 'license': 'apache-2.0', 'repo_name': 'google/j2objc'}