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/*
* Copyright (C) 2020 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 android.os;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.annotation.SystemApi.Client;
/**
* Provides a way to register and obtain the system service binder objects managed by the stats
* service.
*
* <p> Only the statsd mainline module will be able to access an instance of this class.
* @hide
*/
@SystemApi(client = Client.MODULE_LIBRARIES)
public class StatsServiceManager {
/**
* @hide
*/
public StatsServiceManager() {}
/**
* A class that exposes the methods to register and obtain each system service.
*/
public static final class ServiceRegisterer {
private final String mServiceName;
/**
* @hide
*/
public ServiceRegisterer(String serviceName) {
mServiceName = serviceName;
}
/**
* Get the system server binding object for StatsManagerService.
*
* <p> This blocks until the service instance is ready.
* or a timeout happens, in which case it returns null.
*/
@Nullable
public IBinder get() {
return ServiceManager.getService(mServiceName);
}
/**
* Get the system server binding object for a service.
*
* <p>This blocks until the service instance is ready,
* or a timeout happens, in which case it throws {@link ServiceNotFoundException}.
*/
@Nullable
public IBinder getOrThrow() throws ServiceNotFoundException {
try {
return ServiceManager.getServiceOrThrow(mServiceName);
} catch (ServiceManager.ServiceNotFoundException e) {
throw new ServiceNotFoundException(mServiceName);
}
}
/**
* Get the system server binding object for a service. If the specified service is
* not available, it returns null.
*/
@Nullable
private IBinder tryGet() {
return ServiceManager.checkService(mServiceName);
}
}
/**
* See {@link ServiceRegisterer#getOrThrow()}
*/
public static class ServiceNotFoundException extends ServiceManager.ServiceNotFoundException {
/**
* Constructor
*
* @param name the name of the binder service that cannot be found.
*/
public ServiceNotFoundException(@NonNull String name) {
super(name);
}
}
/**
* Returns {@link ServiceRegisterer} for the "statscompanion" service.
*/
@NonNull
public ServiceRegisterer getStatsCompanionServiceRegisterer() {
return new ServiceRegisterer("statscompanion");
}
/**
* Returns {@link ServiceRegisterer} for the "statsmanager" service.
*/
@NonNull
public ServiceRegisterer getStatsManagerServiceRegisterer() {
return new ServiceRegisterer("statsmanager");
}
/**
* Returns {@link ServiceRegisterer} for the "statsd" service.
*/
@NonNull
public ServiceRegisterer getStatsdServiceRegisterer() {
return new ServiceRegisterer("stats");
}
}
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