C++ Future::value方法代码示例

 void ServiceDirectoryClient::onSDEventConnected(qi::Future<SignalLink> future,
   qi::Promise<void> promise, bool isAdd)
 {
   if (promise.future().isFinished()) {
     return;
   }
   if (future.hasError())
   {
     qi::Future<void> fdc = onSocketDisconnected(future.error());
     fdc.connect(&qi::Promise<void>::setError, promise, future.error());
     return;
   }
   bool ready = false;
   {
     boost::mutex::scoped_lock lock(_mutex);
     if (isAdd)
       _addSignalLink = future.value();
     else
       _removeSignalLink = future.value();
     ready = _addSignalLink && _removeSignalLink;
   }
   if (ready)
   {
     promise.setValue(0);
     connected();
   }
 }

static void call_from_java_cont(qi::Future<qi::AnyReference> ret,
    qi::Promise<qi::AnyValue> promise)
{
  if (ret.hasError())
    promise.setError(ret.error());
  else
    promise.setValue(qi::AnyValue(ret.value(), false, true));
}

  void Session_Service::onTransportSocketResult(qi::Future<TransportSocketPtr> value, long requestId) {
    qiLogDebug() << "Got transport socket for service";
    {
      boost::recursive_mutex::scoped_lock sl(_requestsMutex);
      ServiceRequest *sr = serviceRequest(requestId);
      if (!sr)
        return;

      if (value.hasError()) {
        sr->promise.setError(value.error());
        removeRequest(requestId);
        return;
      }
    }
    TransportSocketPtr socket = value.value();

    // If true, this socket came from the socket cache and has already been identified.
    // This typically happens when two services are behind the same endpoint.
    // We forge a message that just shows we've authenticated successfully.
    if (socket->hasReceivedRemoteCapabilities())
    {
      Message dummy;
      CapabilityMap cm;
      cm[AuthProvider::State_Key] = AnyValue::from(AuthProvider::State_Done);
      dummy.setType(Message::Type_Reply);
      dummy.setFunction(qi::Message::ServerFunction_Authenticate);
      dummy.setValue(AnyValue::from(cm), typeOf<CapabilityMap>()->signature());
      onAuthentication(TransportSocket::SocketEventData(dummy), requestId, socket, ClientAuthenticatorPtr(new NullClientAuthenticator), SignalSubscriberPtr());
      return;
    }
    ClientAuthenticatorPtr authenticator = _authFactory->newAuthenticator();
    CapabilityMap authCaps;
    {
      CapabilityMap tmp = authenticator->initialAuthData();
      for (CapabilityMap::iterator it = tmp.begin(), end = tmp.end(); it != end; ++it)
        authCaps[AuthProvider::UserAuthPrefix + it->first] = it->second;
    }
    SignalSubscriberPtr protSubscriber(new SignalSubscriber);
    *protSubscriber = socket->socketEvent.connect(&Session_Service::onAuthentication, this, _1, requestId, socket, authenticator, protSubscriber);


    Message msgCapabilities;
    msgCapabilities.setFunction(Message::ServerFunction_Authenticate);
    msgCapabilities.setService(Message::Service_Server);
    msgCapabilities.setType(Message::Type_Call);

    TransportSocketPtr sdSocket = _sdClient->socket();
    CapabilityMap socketCaps;
    if (sdSocket)
    {
      socketCaps = sdSocket->localCapabilities();
      socket->advertiseCapabilities(socketCaps);
    }
    socketCaps.insert(authCaps.begin(), authCaps.end());
    msgCapabilities.setValue(socketCaps, typeOf<CapabilityMap>()->signature());
    socket->send(msgCapabilities);
  }

 void RemoteObject::onMetaObject(qi::Future<qi::MetaObject> fut, qi::Promise<void> prom) {
   if (fut.hasError()) {
     qiLogVerbose() << "MetaObject error: " << fut.error();
     prom.setError(fut.error());
     return;
   }
   qiLogVerbose() << "Fetched metaobject";
   setMetaObject(fut.value());
   prom.setValue(0);
 }

  void ObjectRegistrar::onFutureFinished(qi::Future<unsigned int> fut, long id, qi::Promise<unsigned int> result)
  {
    if (fut.hasError()) {
      result.setError(fut.error());
      return;
    }
    qi::ServiceInfo              si;
    RegisterServiceMap::iterator it;

    {
      boost::mutex::scoped_lock sl(_registerServiceRequestMutex);
      it = _registerServiceRequest.find(id);
      if (it != _registerServiceRequest.end())
        si = it->second.second;
      if (fut.hasError()) {
        _registerServiceRequest.erase(id);
        result.setError(fut.error());
        return;
      }
    }
    unsigned int idx = fut.value();
    si.setServiceId(idx);
    {
      boost::mutex::scoped_lock sl(_servicesMutex);
      BoundService bs;
      bs.id          = idx;
      bs.object      = it->second.first;
      bs.serviceInfo = si;
      bs.name        = si.name();
      BoundServiceMap::iterator it;
      it = _services.find(idx);
      if (it != _services.end()) {
        qiLogError() << "A service is already registered with that id:" << idx;
        result.setError("Service already registered.");
        return;
      }
      _services[idx] = bs;
      //todo register the object on the server (find a better way)
      Server::addObject(idx, bs.object);
    }

    {
      boost::mutex::scoped_lock sl(_serviceNameToIndexMutex);
      _serviceNameToIndex[si.name()] = idx;
    }
    {
      boost::mutex::scoped_lock sl(_registerServiceRequestMutex);
      _registerServiceRequest.erase(it);
    }

    // ack the Service directory to tell that we are ready
    qi::Future<void> fut2 = _sdClient->serviceReady(idx);
    fut2.connect(boost::bind(&serviceReady, _1, result, idx));
  }

  void Session_Service::onTransportSocketResult(qi::Future<TransportSocketPtr> value, long requestId) {
    qiLogDebug() << "Got transport socket for service";
    qi::Future<void> fut;
    {
      boost::recursive_mutex::scoped_lock sl(_requestsMutex);
      ServiceRequest *sr = serviceRequest(requestId);
      if (!sr)
        return;

      if (value.hasError()) {
        sr->promise.setError(value.error());
        removeRequest(requestId);
        return;
      }

      sr->remoteObject = new qi::RemoteObject(sr->serviceId, value.value());

      //ask the remoteObject to fetch the metaObject
      fut = sr->remoteObject->fetchMetaObject();
    }
    fut.connect(&Session_Service::onRemoteObjectComplete, this, _1, requestId);
  }

  // We received a ServiceInfo, and want to establish a connection
  void Session_Service::onServiceInfoResult(qi::Future<qi::ServiceInfo> result, long requestId, std::string protocol) {
    qiLogDebug() << "Got serviceinfo message";
    {
      boost::recursive_mutex::scoped_lock sl(_requestsMutex);
      ServiceRequest *sr = serviceRequest(requestId);
      if (!sr)
        return;
      if (result.hasError()) {
        sr->promise.setError(result.error());
        removeRequest(requestId);
        return;
      }
      const qi::ServiceInfo &si = result.value();
      sr->serviceId = si.serviceId();
      if (_sdClient->isLocal())
      { // Wait! If sd is local, we necessarily have an open socket
        // on which service was registered, whose lifetime is bound
        // to the service
        TransportSocketPtr s = _sdClient->_socketOfService(sr->serviceId);
        if (!s) // weird
          qiLogVerbose() << "_socketOfService returned 0";
        else
        {
          // check if the socket support that capability
          if (s->remoteCapability("ClientServerSocket", false))
          {
            qiLogVerbose() << "sd is local and service is capable, going through socketOfService";
            onTransportSocketResult(qi::Future<TransportSocketPtr>(s), requestId);
            return;
          }
        }
      }
      //empty serviceInfo
      if (!si.endpoints().size()) {
        std::stringstream ss;
        ss << "No endpoints returned for service:" << sr->name << " (id:" << sr->serviceId << ")";
        qiLogVerbose() << ss.str();
        sr->promise.setError(ss.str());
        removeRequest(requestId);
        return;
      }

      if (protocol != "")
      {
        std::vector<qi::Url>::const_iterator it = si.endpoints().begin();

        for (;
             it != si.endpoints().end() && it->protocol() != protocol;
             it++)
        {
          continue;
        }

        if (it == si.endpoints().end())
        {
          std::stringstream ss;
          ss << "No " << protocol << " endpoint available for service:" << sr->name << " (id:" << sr->serviceId << ")";
          qiLogVerbose() << ss.str();
          sr->promise.setError(ss.str());
        }
      }
    }
    qiLogDebug() << "Requesting socket from cache";
    qi::Future<qi::TransportSocketPtr> fut = _socketCache->socket(result.value(), protocol);
    fut.connect(&Session_Service::onTransportSocketResult, this, _1, requestId);
  }

 void onFutureFinished(qi::Future<std::string> future) {
   if (future.hasError())
     gGlobalE = future.error();
   else
     gGlobalS = future.value();
 }

void consumer(qi::atomic<long> &gSuccess, qi::Future<int> fut) {
  //wont block thread on error
  ASSERT_TRUE(fut.wait(1000));
  EXPECT_EQ(42, fut.value());
  ++gSuccess;
}