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/*
* Copyright (C) 2011 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.os.AsyncTask;
import android.support.annotation.MainThread;
import com.android.dialer.common.Assert;
import java.util.concurrent.Executor;
/**
* Factory methods for creating AsyncTaskExecutors.
*
* <p>All of the factory methods on this class check first to see if you have set a static {@link
* AsyncTaskExecutorFactory} set through the {@link #setFactoryForTest(AsyncTaskExecutorFactory)}
* method, and if so delegate to that instead, which is one way of injecting dependencies for
* testing classes whose construction cannot be controlled such as {@link android.app.Activity}.
*/
public final class AsyncTaskExecutors {
/**
* A single instance of the {@link AsyncTaskExecutorFactory}, to which we delegate if it is
* non-null, for injecting when testing.
*/
private static AsyncTaskExecutorFactory injectedAsyncTaskExecutorFactory = null;
/**
* Creates an AsyncTaskExecutor that submits tasks to run with {@link AsyncTask#SERIAL_EXECUTOR}.
*/
public static AsyncTaskExecutor createAsyncTaskExecutor() {
synchronized (AsyncTaskExecutors.class) {
if (injectedAsyncTaskExecutorFactory != null) {
return injectedAsyncTaskExecutorFactory.createAsyncTaskExeuctor();
}
return new SimpleAsyncTaskExecutor(AsyncTask.SERIAL_EXECUTOR);
}
}
/**
* Creates an AsyncTaskExecutor that submits tasks to run with {@link
* AsyncTask#THREAD_POOL_EXECUTOR}.
*/
public static AsyncTaskExecutor createThreadPoolExecutor() {
synchronized (AsyncTaskExecutors.class) {
if (injectedAsyncTaskExecutorFactory != null) {
return injectedAsyncTaskExecutorFactory.createAsyncTaskExeuctor();
}
return new SimpleAsyncTaskExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
}
public static void setFactoryForTest(AsyncTaskExecutorFactory factory) {
synchronized (AsyncTaskExecutors.class) {
injectedAsyncTaskExecutorFactory = factory;
}
}
/** Interface for creating AsyncTaskExecutor objects. */
public interface AsyncTaskExecutorFactory {
AsyncTaskExecutor createAsyncTaskExeuctor();
}
static class SimpleAsyncTaskExecutor implements AsyncTaskExecutor {
private final Executor executor;
public SimpleAsyncTaskExecutor(Executor executor) {
this.executor = executor;
}
@Override
@MainThread
public <T> AsyncTask<T, ?, ?> submit(Object identifer, AsyncTask<T, ?, ?> task, T... params) {
Assert.isMainThread();
return task.executeOnExecutor(executor, params);
}
}
}
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