[英]How to generate BlockingStub in C++ in Protobuf?
我為Protobuf
使用以下.proto(2.6.1會更詳細):
service InstallService {
rpc getWifiNetworks (WifiRequest) returns (WifiResponse);
}
我已經生成了Java文件,並且正在使用BlockingStub:
TestInstallService.BlockingInterface service = TestInstallService.newBlockingStub(channel);
而且我可以使用if阻止方式(效果很好):
Wifi.WifiResponse response = service.getWifiNetworks(controller, request);
現在,我正在創建C ++客戶端,該客戶端也應該以阻塞的方式工作,但是我既看不到原型,也不在生成的C ++代碼中看到任何Blocking
接口。 如何在Protobuf中的C ++中生成BlockingStub? 如果以異步方式工作,如何通過閉包?
生成的C ++服務文件(.cpp):
class InstallService_Stub;
class InstallService : public ::google::protobuf::Service {
protected:
// This class should be treated as an abstract interface.
inline InstallService() {};
public:
virtual ~InstallService();
typedef InstallService_Stub Stub;
static const ::google::protobuf::ServiceDescriptor* descriptor();
virtual void getWifiNetworks(::google::protobuf::RpcController* controller,
const ::WifiRequest* request,
::WifiResponse* response,
::google::protobuf::Closure* done);
// implements Service ----------------------------------------------
const ::google::protobuf::ServiceDescriptor* GetDescriptor();
void CallMethod(const ::google::protobuf::MethodDescriptor* method,
::google::protobuf::RpcController* controller,
const ::google::protobuf::Message* request,
::google::protobuf::Message* response,
::google::protobuf::Closure* done);
const ::google::protobuf::Message& GetRequestPrototype(
const ::google::protobuf::MethodDescriptor* method) const;
const ::google::protobuf::Message& GetResponsePrototype(
const ::google::protobuf::MethodDescriptor* method) const;
private:
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(InstallService);
};
class InstallService_Stub : public InstallService {
public:
InstallService_Stub(::google::protobuf::RpcChannel* channel);
InstallService_Stub(::google::protobuf::RpcChannel* channel,
::google::protobuf::Service::ChannelOwnership ownership);
~InstallService_Stub();
inline ::google::protobuf::RpcChannel* channel() { return channel_; }
// implements InstallService ------------------------------------------
void getWifiNetworks(::google::protobuf::RpcController* controller,
const ::WifiRequest* request,
::WifiResponse* response,
::google::protobuf::Closure* done);
private:
::google::protobuf::RpcChannel* channel_;
bool owns_channel_;
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(InstallService_Stub);
};
protoc
似乎沒有生成任何阻止代碼,因此我不得不使用自制的阻止功能:
bool callbackFired = false;
void myCallback() {
// ...
callbackFired = true;
}
// run service method
service->myMethod(rpcController, request, response, NewCallback(&myCallback));
// block the thread until callback is invoked
while (!callbackFired);
...
C ++客戶端用法示例: https : //github.com/4ntoine/protobuf-socket-rpc
您這樣做的方法是提供自己的InstallService子類,該子類將覆蓋您要實現的方法:
struct MyInstallService : public InstallService
{
void getWifiNetworks(::google::protobuf::RpcController* controller,
const ::WifiRequest* request,
::WifiResponse* response,
::google::protobuf::Closure* done) override
{
// do your work here
// fill up the response here
done->Run(); // this will trigger the response
}
};
客戶端:像這樣
namespace detail {
template<class F>
struct simple_closure : google::protobuf::Closure {
simple_closure(F f)
: _f(std::move(f))
{}
void Run() override {
_f();
}
private:
F _f;
};
}
template<class F>
std::unique_ptr<detail::simple_closure<F>> make_closure(F&& f) {
return std::make_unique<detail::simple_closure<F>>(std::forward<F>(f));
}
std::unique_ptr<WifiResponse> syncGetWifiNetworks(InstallService_Stub & stub, const WifiRequest& req)
{
auto result = std::make_unique<WifiResponse>();
auto promise = std::promise<std::unique_ptr<WifiResponse>>;
auto future = promise.get_future();
auto controller = allocate_controller(); // you need to write this
auto closure = make_closure([&result, &promise]{
promise.set_value(std::move(result));
});
// assumes you already have an async comms queue - otherwise just
// dispatch this lambda to a std::async(std::launch::async, ...)
comms_queue.dispatch([&controller, &req, &stub, &response]{
stub.getWifiNetworks(controller, &req, response.get(), closure);
};
// HERE is where the current thread blocks until the promise is fulfilled
return future.get();
}
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