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#include "remote_client_session.h"
#include "remote_connection.h"
#include "ybus.h"
using namespace NBus;
using namespace NBus::NPrivate;
/////////////////////////////////////////////////////////////////
/// Object that encapsulates all messgae data required for sending
/// a message synchronously and receiving a reply. It includes:
/// 1. ConditionVariable to wait on message reply
/// 2. Lock used by condition variable
/// 3. Message reply
/// 4. Reply status
struct TBusSyncMessageData {
TCondVar ReplyEvent;
TMutex ReplyLock;
TBusMessage* Reply;
EMessageStatus ReplyStatus;
TBusSyncMessageData()
: Reply(nullptr)
, ReplyStatus(MESSAGE_DONT_ASK)
{
}
};
class TSyncHandler: public IBusClientHandler {
public:
TSyncHandler(bool expectReply = true)
: ExpectReply(expectReply)
, Session(nullptr)
{
}
~TSyncHandler() override {
}
void OnReply(TAutoPtr<TBusMessage> pMessage0, TAutoPtr<TBusMessage> pReply0) override {
TBusMessage* pMessage = pMessage0.Release();
TBusMessage* pReply = pReply0.Release();
if (!ExpectReply) { // Maybe need VERIFY, but it will be better to support backward compatibility here.
return;
}
TBusSyncMessageData* data = static_cast<TBusSyncMessageData*>(pMessage->Data);
SignalResult(data, pReply, MESSAGE_OK);
}
void OnError(TAutoPtr<TBusMessage> pMessage0, EMessageStatus status) override {
TBusMessage* pMessage = pMessage0.Release();
TBusSyncMessageData* data = static_cast<TBusSyncMessageData*>(pMessage->Data);
if (!data) {
return;
}
SignalResult(data, /*pReply=*/nullptr, status);
}
void OnMessageSent(TBusMessage* pMessage) override {
Y_UNUSED(pMessage);
Y_ASSERT(ExpectReply);
}
void OnMessageSentOneWay(TAutoPtr<TBusMessage> pMessage) override {
Y_ASSERT(!ExpectReply);
TBusSyncMessageData* data = static_cast<TBusSyncMessageData*>(pMessage.Release()->Data);
SignalResult(data, /*pReply=*/nullptr, MESSAGE_OK);
}
void SetSession(TRemoteClientSession* session) {
if (!ExpectReply) {
Session = session;
}
}
private:
void SignalResult(TBusSyncMessageData* data, TBusMessage* pReply, EMessageStatus status) const {
Y_VERIFY(data, "Message data is set to NULL.");
TGuard<TMutex> G(data->ReplyLock);
data->Reply = pReply;
data->ReplyStatus = status;
data->ReplyEvent.Signal();
}
private:
// This is weird, because in regular client one-way-ness is selected per call, not per session.
bool ExpectReply;
TRemoteClientSession* Session;
};
namespace NBus {
namespace NPrivate {
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4250) // 'NBus::NPrivate::TRemoteClientSession' : inherits 'NBus::NPrivate::TBusSessionImpl::NBus::NPrivate::TBusSessionImpl::GetConfig' via dominance
#endif
///////////////////////////////////////////////////////////////////////////
class TBusSyncSourceSessionImpl
: private TSyncHandler
// TODO: do not extend TRemoteClientSession
,
public TRemoteClientSession {
private:
bool NeedReply;
public:
TBusSyncSourceSessionImpl(TBusMessageQueue* queue, TBusProtocol* proto, const TBusClientSessionConfig& config, bool needReply, const TString& name)
: TSyncHandler(needReply)
, TRemoteClientSession(queue, proto, this, config, name)
, NeedReply(needReply)
{
SetSession(this);
}
TBusMessage* SendSyncMessage(TBusMessage* pMessage, EMessageStatus& status, const TNetAddr* addr = nullptr) {
Y_VERIFY(!Queue->GetExecutor()->IsInExecutorThread(),
"SendSyncMessage must not be called from executor thread");
TBusMessage* reply = nullptr;
THolder<TBusSyncMessageData> data(new TBusSyncMessageData());
pMessage->Data = data.Get();
{
TGuard<TMutex> G(data->ReplyLock);
if (NeedReply) {
status = SendMessage(pMessage, addr, false); // probably should be true
} else {
status = SendMessageOneWay(pMessage, addr);
}
if (status == MESSAGE_OK) {
data->ReplyEvent.Wait(data->ReplyLock);
TBusSyncMessageData* rdata = static_cast<TBusSyncMessageData*>(pMessage->Data);
Y_VERIFY(rdata == data.Get(), "Message data pointer should not be modified.");
reply = rdata->Reply;
status = rdata->ReplyStatus;
}
}
// deletion of message and reply is a job of application.
pMessage->Data = nullptr;
return reply;
}
};
#ifdef _MSC_VER
#pragma warning(pop)
#endif
}
}
TBusSyncSourceSession::TBusSyncSourceSession(TIntrusivePtr< ::NBus::NPrivate::TBusSyncSourceSessionImpl> session)
: Session(session)
{
}
TBusSyncSourceSession::~TBusSyncSourceSession() {
Shutdown();
}
void TBusSyncSourceSession::Shutdown() {
Session->Shutdown();
}
TBusMessage* TBusSyncSourceSession::SendSyncMessage(TBusMessage* pMessage, EMessageStatus& status, const TNetAddr* addr) {
return Session->SendSyncMessage(pMessage, status, addr);
}
int TBusSyncSourceSession::RegisterService(const char* hostname, TBusKey start, TBusKey end, EIpVersion ipVersion) {
return Session->RegisterService(hostname, start, end, ipVersion);
}
int TBusSyncSourceSession::GetInFlight() {
return Session->GetInFlight();
}
const TBusProtocol* TBusSyncSourceSession::GetProto() const {
return Session->GetProto();
}
const TBusClientSession* TBusSyncSourceSession::GetBusClientSessionWorkaroundDoNotUse() const {
return Session.Get();
}
TBusSyncClientSessionPtr TBusMessageQueue::CreateSyncSource(TBusProtocol* proto, const TBusClientSessionConfig& config, bool needReply, const TString& name) {
TIntrusivePtr<TBusSyncSourceSessionImpl> session = new TBusSyncSourceSessionImpl(this, proto, config, needReply, name);
Add(session.Get());
return new TBusSyncSourceSession(session);
}
void TBusMessageQueue::Destroy(TBusSyncClientSessionPtr session) {
Destroy(session->Session.Get());
Y_UNUSED(session->Session.Release());
}
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