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/*
* Copyright (C) 2016 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 <hidl/HidlLazyUtils.h>
#include <hidl/HidlTransportSupport.h>
#include <sys/wait.h>
#include <utils/Errors.h>
#include <utils/Log.h>
#include <utils/StrongPointer.h>
#pragma once
namespace android {
namespace hardware {
namespace details {
template <class Interface, typename Func>
__attribute__((warn_unused_result)) status_t registerPassthroughServiceImplementation(
Func registerServiceCb, const std::string& name = "default") {
sp<Interface> service = Interface::getService(name, true /* getStub */);
if (service == nullptr) {
ALOGE("Could not get passthrough implementation for %s/%s.",
Interface::descriptor, name.c_str());
return EXIT_FAILURE;
}
LOG_FATAL_IF(service->isRemote(), "Implementation of %s/%s is remote!",
Interface::descriptor, name.c_str());
status_t status = registerServiceCb(service, name);
if (status == OK) {
ALOGI("Registration complete for %s/%s.",
Interface::descriptor, name.c_str());
} else {
ALOGE("Could not register service %s/%s (%d).",
Interface::descriptor, name.c_str(), status);
}
return status;
}
} // namespace details
/**
* Registers passthrough service implementation.
*/
template <class Interface>
__attribute__((warn_unused_result)) status_t registerPassthroughServiceImplementation(
const std::string& name = "default") {
return details::registerPassthroughServiceImplementation<Interface>(
[](const sp<Interface>& service, const std::string& name) {
return service->registerAsService(name);
},
name);
}
/**
* Creates default passthrough service implementation. This method never returns.
*
* Return value is exit status.
*/
template <class Interface>
__attribute__((warn_unused_result)) status_t defaultPassthroughServiceImplementation(
const std::string& name, size_t maxThreads = 1) {
configureRpcThreadpool(maxThreads, true);
status_t result = registerPassthroughServiceImplementation<Interface>(name);
if (result != OK) {
return result;
}
joinRpcThreadpool();
return UNKNOWN_ERROR;
}
template<class Interface>
__attribute__((warn_unused_result))
status_t defaultPassthroughServiceImplementation(size_t maxThreads = 1) {
return defaultPassthroughServiceImplementation<Interface>("default", maxThreads);
}
/**
* Registers a passthrough service implementation that exits when there are 0 clients.
*
* If this function is called multiple times to register different services, then this process will
* only exit once all services have 0 clients. This function does not know about clients registered
* through registerPassthroughServiceImplementation, so if that function is used in conjunction with
* this one, the process may exit while a client is still using the HAL.
*/
template <class Interface>
__attribute__((warn_unused_result)) status_t registerLazyPassthroughServiceImplementation(
const std::string& name = "default") {
// Make LazyServiceRegistrar static so that multiple calls to
// registerLazyPassthroughServiceImplementation work as expected: each HAL is registered and the
// process only exits once all HALs have 0 clients.
using android::hardware::LazyServiceRegistrar;
static auto serviceCounter(std::make_shared<LazyServiceRegistrar>());
return details::registerPassthroughServiceImplementation<Interface>(
[](const sp<Interface>& service, const std::string& name) {
return serviceCounter->registerService(service, name);
},
name);
}
/**
* Creates default passthrough service implementation that exits when there are 0 clients. This
* method never returns.
*
* Return value is exit status.
*/
template <class Interface>
__attribute__((warn_unused_result)) status_t defaultLazyPassthroughServiceImplementation(
const std::string& name, size_t maxThreads = 1) {
configureRpcThreadpool(maxThreads, true);
status_t result = registerLazyPassthroughServiceImplementation<Interface>(name);
if (result != OK) {
return result;
}
joinRpcThreadpool();
return UNKNOWN_ERROR;
}
template <class Interface>
__attribute__((warn_unused_result)) status_t defaultLazyPassthroughServiceImplementation(
size_t maxThreads = 1) {
return defaultLazyPassthroughServiceImplementation<Interface>("default", maxThreads);
}
} // namespace hardware
} // namespace android
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