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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.dialer.common.concurrent;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.MainThread;
import android.support.annotation.Nullable;
import com.android.dialer.common.Assert;
import com.android.dialer.common.LogUtil;
import com.android.dialer.common.concurrent.AsyncTaskExecutors.SimpleAsyncTaskExecutor;
import com.android.dialer.common.concurrent.DialerExecutor.FailureListener;
import com.android.dialer.common.concurrent.DialerExecutor.SuccessListener;
import com.android.dialer.common.concurrent.DialerExecutor.Worker;
import java.util.concurrent.ExecutorService;
/**
* Do not use this class directly. Instead use {@link DialerExecutors}.
*
* @param <InputT> the type of the object sent to the task upon execution
* @param <OutputT> the type of the result of the background computation
*/
public final class DialerUiTaskFragment<InputT, OutputT> extends Fragment {
private String taskId;
private Worker<InputT, OutputT> worker;
private SuccessListener<OutputT> successListener;
private FailureListener failureListener;
private AsyncTaskExecutor serialExecutor = AsyncTaskExecutors.createAsyncTaskExecutor();
private AsyncTaskExecutor parallelExecutor = AsyncTaskExecutors.createThreadPoolExecutor();
/**
* Creates a new {@link DialerUiTaskFragment} or gets an existing one in the event that a
* configuration change occurred while the previous activity's task was still running. Must be
* called from onCreate of your activity or fragment.
*
* @param taskId used for the headless fragment ID and task ID
* @param worker a function executed on a worker thread which accepts an {@link InputT} and
* returns an {@link OutputT}. It should ideally not be an inner class of your
* activity/fragment (meaning it should not be a lambda, anonymous, or non-static) but it can
* be a static nested class. The static nested class should not contain any reference to UI,
* including any activity or fragment or activity context, though it may reference some
* threadsafe system objects such as the application context.
* @param successListener a function executed on the main thread upon task success. There are no
* restraints on this as it is executed on the main thread, so lambdas, anonymous, or inner
* classes of your activity or fragment are all fine.
* @param failureListener a function executed on the main thread upon task failure. The exception
* is already logged so this can often be a no-op. There are no restraints on this as it is
* executed on the main thread, so lambdas, anonymous, or inner classes of your activity or
* fragment are all fine.
* @param <InputT> the type of the object sent to the task upon execution
* @param <OutputT> the type of the result of the background computation
* @return a {@link DialerUiTaskFragment} which may be used to call the "execute*" methods
*/
@MainThread
static <InputT, OutputT> DialerUiTaskFragment<InputT, OutputT> create(
FragmentManager fragmentManager,
String taskId,
Worker<InputT, OutputT> worker,
SuccessListener<OutputT> successListener,
FailureListener failureListener,
@Nullable ExecutorService serialExecutorService,
@Nullable ExecutorService parallelExecutorService) {
Assert.isMainThread();
DialerUiTaskFragment<InputT, OutputT> fragment =
(DialerUiTaskFragment<InputT, OutputT>) fragmentManager.findFragmentByTag(taskId);
if (fragment == null) {
LogUtil.i("DialerUiTaskFragment.create", "creating new DialerUiTaskFragment");
fragment = new DialerUiTaskFragment<>();
fragmentManager.beginTransaction().add(fragment, taskId).commit();
}
fragment.taskId = taskId;
fragment.worker = worker;
fragment.successListener = successListener;
fragment.failureListener = failureListener;
if (serialExecutorService != null) {
fragment.serialExecutor = new SimpleAsyncTaskExecutor(serialExecutorService);
}
if (parallelExecutorService != null) {
fragment.parallelExecutor = new SimpleAsyncTaskExecutor(parallelExecutorService);
}
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Override
public void onDetach() {
super.onDetach();
LogUtil.enterBlock("DialerUiTaskFragment.onDetach");
taskId = null;
successListener = null;
failureListener = null;
}
void executeSerial(InputT input) {
serialExecutor.submit(taskId, new InternalTask(), input);
}
void executeParallel(InputT input) {
parallelExecutor.submit(taskId, new InternalTask(), input);
}
void executeOnCustomExecutor(ExecutorService executor, InputT input) {
new SimpleAsyncTaskExecutor(executor).submit(taskId, new InternalTask(), input);
}
private final class InternalTask extends AsyncTask<InputT, Void, InternalTaskResult<OutputT>> {
@SafeVarargs
@Override
protected final InternalTaskResult<OutputT> doInBackground(InputT... params) {
try {
return new InternalTaskResult<>(null, worker.doInBackground(params[0]));
} catch (Throwable throwable) {
LogUtil.e("InternalTask.doInBackground", "task failed", throwable);
return new InternalTaskResult<>(throwable, null);
}
}
@Override
protected void onPostExecute(InternalTaskResult<OutputT> result) {
if (result.throwable != null) {
if (failureListener == null) {
LogUtil.i("InternalTask.onPostExecute", "task failed but UI is dead");
} else {
failureListener.onFailure(result.throwable);
}
} else if (successListener == null) {
LogUtil.i("InternalTask.onPostExecute", "task succeeded but UI is dead");
} else {
successListener.onSuccess(result.result);
}
}
}
private static class InternalTaskResult<OutputT> {
private final Throwable throwable;
private final OutputT result;
InternalTaskResult(Throwable throwable, OutputT result) {
this.throwable = throwable;
this.result = result;
}
}
}
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