resolv/ResolverEventReporter.cpp

/*
 * 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.
 */

#include "ResolverEventReporter.h"

#include <android/binder_manager.h>

using aidl::android::net::metrics::INetdEventListener;

std::shared_ptr<INetdEventListener> ResolverEventReporter::getListener() {
    // It should be initialized only once.
    static ResolverEventReporter reporter;
    return reporter.getNetdEventListener();
}

std::shared_ptr<INetdEventListener> ResolverEventReporter::getNetdEventListener() {
    std::lock_guard lock(mEventMutex);
    if (mListener == nullptr) {
        // Use the non-blocking call AServiceManager_checkService in order not to delay DNS
        // lookup threads when the netd_listener service is not ready.
        ndk::SpAIBinder binder = ndk::SpAIBinder(AServiceManager_checkService("netd_listener"));
        mListener = INetdEventListener::fromBinder(binder);
    }
    return mListener;
}