ServiceLoaderWrapper.java
/*
* Copyright (C) 2018 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 androidx.test.internal.platform;
import android.os.StrictMode;
import java.util.ArrayList;
import java.util.List;
import java.util.ServiceLoader;
/**
* Wrapper class for {@link ServiceLoader} that disables StrictMode.
*
* <p>Loading a service via ServiceLoader can result in disk I/O. Disk I/O on Android can be
* restricted via StrictMode. This class disables disk access checking and then reenables StrictMode
* when loading a service.
*/
public final class ServiceLoaderWrapper {
private ServiceLoaderWrapper() {}
/**
* Loads the implementing classes for given service.
*
* @return List of implementing classes. Returns an empty list if no implementing classes were
* defined.
*/
public static <T> List<T> loadService(Class<T> serviceClass) {
StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
// load using ServiceLoader
List<T> services = new ArrayList<>();
for (T element : ServiceLoader.load(serviceClass)) {
services.add(element);
}
StrictMode.setThreadPolicy(oldPolicy);
return services;
}
}