test/cpp/qps/client_async.cc - platform/external/grpc-grpc - Gitiles

 /*
  *
  * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #include <cassert>
 #include <functional>
 #include <memory>
 #include <string>
 #include <thread>
 #include <vector>
 #include <sstream>

 #include <grpc/grpc.h>
 #include <grpc/support/histogram.h>
 #include <grpc/support/log.h>
 #include <gflags/gflags.h>
 #include <grpc++/async_unary_call.h>
 #include <grpc++/client_context.h>
 #include <grpc++/status.h>
 #include <grpc++/stream.h>
 #include "test/cpp/util/create_test_channel.h"
 #include "test/cpp/qps/qpstest.pb.h"
 #include "test/cpp/qps/timer.h"
 #include "test/cpp/qps/client.h"

 namespace grpc {
 namespace testing {

 class ClientRpcContext {
  public:
   ClientRpcContext() {}
   virtual ~ClientRpcContext() {}
   // next state, return false if done. Collect stats when appropriate
   virtual bool RunNextState(bool, Histogram* hist) = 0;
   virtual void StartNewClone() = 0;
   static void* tag(ClientRpcContext* c) { return reinterpret_cast<void*>(c); }
   static ClientRpcContext* detag(void* t) {
     return reinterpret_cast<ClientRpcContext*>(t);
   }
 };

 template <class RequestType, class ResponseType>
 class ClientRpcContextUnaryImpl : public ClientRpcContext {
  public:
   ClientRpcContextUnaryImpl(
       TestService::Stub* stub, const RequestType& req,
       std::function<
           std::unique_ptr<grpc::ClientAsyncResponseReader<ResponseType>>(
               TestService::Stub*, grpc::ClientContext*, const RequestType&,
               void*)> start_req,
       std::function<void(grpc::Status, ResponseType*)> on_done)
       : context_(),
         stub_(stub),
         req_(req),
         response_(),
         next_state_(&ClientRpcContextUnaryImpl::ReqSent),
         callback_(on_done),
         start_req_(start_req),
         start_(Timer::Now()),
         response_reader_(
             start_req(stub_, &context_, req_, ClientRpcContext::tag(this))) {}
   ~ClientRpcContextUnaryImpl() GRPC_OVERRIDE {}
   bool RunNextState(bool ok, Histogram* hist) GRPC_OVERRIDE {
     bool ret = (this->*next_state_)(ok);
     if (!ret) {
       hist->Add((Timer::Now() - start_) * 1e9);
     }
     return ret;
   }

   void StartNewClone() GRPC_OVERRIDE {
     new ClientRpcContextUnaryImpl(stub_, req_, start_req_, callback_);
   }

  private:
   bool ReqSent(bool) {
     next_state_ = &ClientRpcContextUnaryImpl::RespDone;
     response_reader_->Finish(&response_, &status_, ClientRpcContext::tag(this));
     return true;
   }
   bool RespDone(bool) {
     next_state_ = &ClientRpcContextUnaryImpl::DoCallBack;
     return false;
   }
   bool DoCallBack(bool) {
     callback_(status_, &response_);
     return false;
   }
   grpc::ClientContext context_;
   TestService::Stub* stub_;
   RequestType req_;
   ResponseType response_;
   bool (ClientRpcContextUnaryImpl::*next_state_)(bool);
   std::function<void(grpc::Status, ResponseType*)> callback_;
   std::function<std::unique_ptr<grpc::ClientAsyncResponseReader<ResponseType>>(
       TestService::Stub*, grpc::ClientContext*, const RequestType&, void*)>
       start_req_;
   grpc::Status status_;
   double start_;
   std::unique_ptr<grpc::ClientAsyncResponseReader<ResponseType>>
       response_reader_;
 };

 class AsyncUnaryClient GRPC_FINAL : public Client {
  public:
   explicit AsyncUnaryClient(const ClientConfig& config) : Client(config) {
     for (int i = 0; i < config.async_client_threads(); i++) {
       cli_cqs_.emplace_back(new CompletionQueue);
     }

     auto payload_size = config.payload_size();
     auto check_done = [payload_size](grpc::Status s, SimpleResponse* response) {
       GPR_ASSERT(s.IsOk() && (response->payload().type() ==
                               grpc::testing::PayloadType::COMPRESSABLE) &&
                  (response->payload().body().length() ==
                   static_cast<size_t>(payload_size)));
     };

     int t = 0;
     for (int i = 0; i < config.outstanding_rpcs_per_channel(); i++) {
       for (auto channel = channels_.begin(); channel != channels_.end();
 	   channel++) {
         auto* cq = cli_cqs_[t].get();
         t = (t + 1) % cli_cqs_.size();
         auto start_req = [cq](TestService::Stub* stub, grpc::ClientContext* ctx,
                               const SimpleRequest& request, void* tag) {
           return stub->AsyncUnaryCall(ctx, request, cq, tag);
         };

         TestService::Stub* stub = channel->get_stub();
         const SimpleRequest& request = request_;
         new ClientRpcContextUnaryImpl<SimpleRequest, SimpleResponse>(
             stub, request, start_req, check_done);
       }
     }

     StartThreads(config.async_client_threads());
   }

   ~AsyncUnaryClient() GRPC_OVERRIDE {
     EndThreads();

     for (auto cq = cli_cqs_.begin(); cq != cli_cqs_.end(); cq++) {
       (*cq)->Shutdown();
       void* got_tag;
       bool ok;
       while ((*cq)->Next(&got_tag, &ok)) {
         delete ClientRpcContext::detag(got_tag);
       }
     }
   }

   void ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
     void* got_tag;
     bool ok;
     cli_cqs_[thread_idx]->Next(&got_tag, &ok);

     ClientRpcContext* ctx = ClientRpcContext::detag(got_tag);
     if (ctx->RunNextState(ok, histogram) == false) {
       // call the callback and then delete it
       ctx->RunNextState(ok, histogram);
       ctx->StartNewClone();
       delete ctx;
     }
   }

   std::vector<std::unique_ptr<CompletionQueue>> cli_cqs_;
 };

 template <class RequestType, class ResponseType>
 class ClientRpcContextStreamingImpl : public ClientRpcContext {
  public:
   ClientRpcContextStreamingImpl(
       TestService::Stub *stub, const RequestType &req,
       std::function<
               std::unique_ptr<grpc::ClientAsyncReaderWriter<
                               RequestType,ResponseType>>(
               TestService::Stub *, grpc::ClientContext *, void *)> start_req,
       std::function<void(grpc::Status, ResponseType *)> on_done)
       : context_(),
         stub_(stub),
         req_(req),
         response_(),
         next_state_(&ClientRpcContextStreamingImpl::ReqSent),
         callback_(on_done),
         start_req_(start_req),
         start_(Timer::Now()),
         stream_(start_req_(stub_, &context_, ClientRpcContext::tag(this))) {}
   ~ClientRpcContextStreamingImpl() GRPC_OVERRIDE {}
   bool RunNextState(bool ok, Histogram *hist) GRPC_OVERRIDE {
     return (this->*next_state_)(ok, hist);
   }
   void StartNewClone() GRPC_OVERRIDE {
     new ClientRpcContextStreamingImpl(stub_, req_, start_req_, callback_);
   }

  private:
   bool ReqSent(bool ok, Histogram *) {
     return StartWrite(ok);
   }
   bool StartWrite(bool ok) {
     if (!ok) {
       return(false);
     }
     start_ = Timer::Now();
     next_state_ = &ClientRpcContextStreamingImpl::WriteDone;
     stream_->Write(req_, ClientRpcContext::tag(this));
     return true;
   }
   bool WriteDone(bool ok, Histogram *) {
     if (!ok) {
       return(false);
     }
     next_state_ = &ClientRpcContextStreamingImpl::ReadDone;
     stream_->Read(&response_, ClientRpcContext::tag(this));
     return true;
   }
   bool ReadDone(bool ok, Histogram *hist) {
     hist->Add((Timer::Now() - start_) * 1e9);
     return StartWrite(ok);
   }
   grpc::ClientContext context_;
   TestService::Stub *stub_;
   RequestType req_;
   ResponseType response_;
   bool (ClientRpcContextStreamingImpl::*next_state_)(bool, Histogram *);
   std::function<void(grpc::Status, ResponseType *)> callback_;
   std::function<std::unique_ptr<grpc::ClientAsyncReaderWriter<
 				  RequestType,ResponseType>>(
       TestService::Stub *, grpc::ClientContext *, void *)> start_req_;
   grpc::Status status_;
   double start_;
   std::unique_ptr<grpc::ClientAsyncReaderWriter<RequestType,ResponseType>>
     stream_;
 };

 class AsyncStreamingClient GRPC_FINAL : public Client {
  public:
   explicit AsyncStreamingClient(const ClientConfig &config) : Client(config) {
     for (int i = 0; i < config.async_client_threads(); i++) {
       cli_cqs_.emplace_back(new CompletionQueue);
     }

     auto payload_size = config.payload_size();
     auto check_done = [payload_size](grpc::Status s, SimpleResponse *response) {
       GPR_ASSERT(s.IsOk() && (response->payload().type() ==
                               grpc::testing::PayloadType::COMPRESSABLE) &&
                  (response->payload().body().length() ==
                   static_cast<size_t>(payload_size)));
     };

     int t = 0;
     for (int i = 0; i < config.outstanding_rpcs_per_channel(); i++) {
       for (auto channel = channels_.begin(); channel != channels_.end();
            channel++) {
         auto* cq = cli_cqs_[t].get();
         t = (t + 1) % cli_cqs_.size();
         auto start_req = [cq](TestService::Stub *stub, grpc::ClientContext *ctx,
                               void *tag) {
           auto stream = stub->AsyncStreamingCall(ctx, cq, tag);
           return stream;
         };

         TestService::Stub *stub = channel->get_stub();
         const SimpleRequest &request = request_;
         new ClientRpcContextStreamingImpl<SimpleRequest, SimpleResponse>(
             stub, request, start_req, check_done);
       }
     }

     StartThreads(config.async_client_threads());
   }

   ~AsyncStreamingClient() GRPC_OVERRIDE {
     EndThreads();

     for (auto cq = cli_cqs_.begin(); cq != cli_cqs_.end(); cq++) {
       (*cq)->Shutdown();
       void *got_tag;
       bool ok;
       while ((*cq)->Next(&got_tag, &ok)) {
         delete ClientRpcContext::detag(got_tag);
       }
     }
   }

   void ThreadFunc(Histogram *histogram, size_t thread_idx) GRPC_OVERRIDE {
     void *got_tag;
     bool ok;
     cli_cqs_[thread_idx]->Next(&got_tag, &ok);

     ClientRpcContext *ctx = ClientRpcContext::detag(got_tag);
     if (ctx->RunNextState(ok, histogram) == false) {
       // call the callback and then delete it
       ctx->RunNextState(ok, histogram);
       ctx->StartNewClone();
       delete ctx;
     }
   }

   std::vector<std::unique_ptr<CompletionQueue>> cli_cqs_;
 };

 std::unique_ptr<Client> CreateAsyncUnaryClient(const ClientConfig& args) {
   return std::unique_ptr<Client>(new AsyncUnaryClient(args));
 }
 std::unique_ptr<Client> CreateAsyncStreamingClient(const ClientConfig& args) {
   return std::unique_ptr<Client>(new AsyncStreamingClient(args));
 }

 }  // namespace testing
 }  // namespace grpc
	/*
	*
	* Copyright 2015, Google Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#include <cassert>
	#include <functional>
	#include <memory>
	#include <string>
	#include <thread>
	#include <vector>
	#include <sstream>

	#include <grpc/grpc.h>
	#include <grpc/support/histogram.h>
	#include <grpc/support/log.h>
	#include <gflags/gflags.h>
	#include <grpc++/async_unary_call.h>
	#include <grpc++/client_context.h>
	#include <grpc++/status.h>
	#include <grpc++/stream.h>
	#include "test/cpp/util/create_test_channel.h"
	#include "test/cpp/qps/qpstest.pb.h"
	#include "test/cpp/qps/timer.h"
	#include "test/cpp/qps/client.h"

	namespace grpc {
	namespace testing {

	class ClientRpcContext {
	public:
	ClientRpcContext() {}
	virtual ~ClientRpcContext() {}
	// next state, return false if done. Collect stats when appropriate
	virtual bool RunNextState(bool, Histogram* hist) = 0;
	virtual void StartNewClone() = 0;
	static void* tag(ClientRpcContext* c) { return reinterpret_cast<void*>(c); }
	static ClientRpcContext* detag(void* t) {
	return reinterpret_cast<ClientRpcContext*>(t);
	}
	};

	template <class RequestType, class ResponseType>
	class ClientRpcContextUnaryImpl : public ClientRpcContext {
	public:
	ClientRpcContextUnaryImpl(
	TestService::Stub* stub, const RequestType& req,
	std::function<
	std::unique_ptr<grpc::ClientAsyncResponseReader<ResponseType>>(
	TestService::Stub, grpc::ClientContext, const RequestType&,
	void*)> start_req,
	std::function<void(grpc::Status, ResponseType*)> on_done)
	: context_(),
	stub_(stub),
	req_(req),
	response_(),
	next_state_(&ClientRpcContextUnaryImpl::ReqSent),
	callback_(on_done),
	start_req_(start_req),
	start_(Timer::Now()),
	response_reader_(
	start_req(stub_, &context_, req_, ClientRpcContext::tag(this))) {}
	~ClientRpcContextUnaryImpl() GRPC_OVERRIDE {}
	bool RunNextState(bool ok, Histogram* hist) GRPC_OVERRIDE {
	bool ret = (this->*next_state_)(ok);
	if (!ret) {
	hist->Add((Timer::Now() - start_) * 1e9);
	}
	return ret;
	}

	void StartNewClone() GRPC_OVERRIDE {
	new ClientRpcContextUnaryImpl(stub_, req_, start_req_, callback_);
	}

	private:
	bool ReqSent(bool) {
	next_state_ = &ClientRpcContextUnaryImpl::RespDone;
	response_reader_->Finish(&response_, &status_, ClientRpcContext::tag(this));
	return true;
	}
	bool RespDone(bool) {
	next_state_ = &ClientRpcContextUnaryImpl::DoCallBack;
	return false;
	}
	bool DoCallBack(bool) {
	callback_(status_, &response_);
	return false;
	}
	grpc::ClientContext context_;
	TestService::Stub* stub_;
	RequestType req_;
	ResponseType response_;
	bool (ClientRpcContextUnaryImpl::*next_state_)(bool);
	std::function<void(grpc::Status, ResponseType*)> callback_;
	std::function<std::unique_ptr<grpc::ClientAsyncResponseReader<ResponseType>>(
	TestService::Stub, grpc::ClientContext, const RequestType&, void*)>
	start_req_;
	grpc::Status status_;
	double start_;
	std::unique_ptr<grpc::ClientAsyncResponseReader<ResponseType>>
	response_reader_;
	};

	class AsyncUnaryClient GRPC_FINAL : public Client {
	public:
	explicit AsyncUnaryClient(const ClientConfig& config) : Client(config) {
	for (int i = 0; i < config.async_client_threads(); i++) {
	cli_cqs_.emplace_back(new CompletionQueue);
	}

	auto payload_size = config.payload_size();
	auto check_done = [payload_size](grpc::Status s, SimpleResponse* response) {
	GPR_ASSERT(s.IsOk() && (response->payload().type() ==
	grpc::testing::PayloadType::COMPRESSABLE) &&
	(response->payload().body().length() ==
	static_cast<size_t>(payload_size)));
	};

	int t = 0;
	for (int i = 0; i < config.outstanding_rpcs_per_channel(); i++) {
	for (auto channel = channels_.begin(); channel != channels_.end();
	channel++) {
	auto* cq = cli_cqs_[t].get();
	t = (t + 1) % cli_cqs_.size();
	auto start_req = [cq](TestService::Stub* stub, grpc::ClientContext* ctx,
	const SimpleRequest& request, void* tag) {
	return stub->AsyncUnaryCall(ctx, request, cq, tag);
	};

	TestService::Stub* stub = channel->get_stub();
	const SimpleRequest& request = request_;
	new ClientRpcContextUnaryImpl<SimpleRequest, SimpleResponse>(
	stub, request, start_req, check_done);
	}
	}

	StartThreads(config.async_client_threads());
	}

	~AsyncUnaryClient() GRPC_OVERRIDE {
	EndThreads();

	for (auto cq = cli_cqs_.begin(); cq != cli_cqs_.end(); cq++) {
	(*cq)->Shutdown();
	void* got_tag;
	bool ok;
	while ((*cq)->Next(&got_tag, &ok)) {
	delete ClientRpcContext::detag(got_tag);
	}
	}
	}

	void ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
	void* got_tag;
	bool ok;
	cli_cqs_[thread_idx]->Next(&got_tag, &ok);

	ClientRpcContext* ctx = ClientRpcContext::detag(got_tag);
	if (ctx->RunNextState(ok, histogram) == false) {
	// call the callback and then delete it
	ctx->RunNextState(ok, histogram);
	ctx->StartNewClone();
	delete ctx;
	}
	}

	std::vector<std::unique_ptr<CompletionQueue>> cli_cqs_;
	};

	template <class RequestType, class ResponseType>
	class ClientRpcContextStreamingImpl : public ClientRpcContext {
	public:
	ClientRpcContextStreamingImpl(
	TestService::Stub *stub, const RequestType &req,
	std::function<
	std::unique_ptr<grpc::ClientAsyncReaderWriter<
	RequestType,ResponseType>>(
	TestService::Stub , grpc::ClientContext , void *)> start_req,
	std::function<void(grpc::Status, ResponseType *)> on_done)
	: context_(),
	stub_(stub),
	req_(req),
	response_(),
	next_state_(&ClientRpcContextStreamingImpl::ReqSent),
	callback_(on_done),
	start_req_(start_req),
	start_(Timer::Now()),
	stream_(start_req_(stub_, &context_, ClientRpcContext::tag(this))) {}
	~ClientRpcContextStreamingImpl() GRPC_OVERRIDE {}
	bool RunNextState(bool ok, Histogram *hist) GRPC_OVERRIDE {
	return (this->*next_state_)(ok, hist);
	}
	void StartNewClone() GRPC_OVERRIDE {
	new ClientRpcContextStreamingImpl(stub_, req_, start_req_, callback_);
	}

	private:
	bool ReqSent(bool ok, Histogram *) {
	return StartWrite(ok);
	}
	bool StartWrite(bool ok) {
	if (!ok) {
	return(false);
	}
	start_ = Timer::Now();
	next_state_ = &ClientRpcContextStreamingImpl::WriteDone;
	stream_->Write(req_, ClientRpcContext::tag(this));
	return true;
	}
	bool WriteDone(bool ok, Histogram *) {
	if (!ok) {
	return(false);
	}
	next_state_ = &ClientRpcContextStreamingImpl::ReadDone;
	stream_->Read(&response_, ClientRpcContext::tag(this));
	return true;
	}
	bool ReadDone(bool ok, Histogram *hist) {
	hist->Add((Timer::Now() - start_) * 1e9);
	return StartWrite(ok);
	}
	grpc::ClientContext context_;
	TestService::Stub *stub_;
	RequestType req_;
	ResponseType response_;
	bool (ClientRpcContextStreamingImpl::next_state_)(bool, Histogram );
	std::function<void(grpc::Status, ResponseType *)> callback_;
	std::function<std::unique_ptr<grpc::ClientAsyncReaderWriter<
	RequestType,ResponseType>>(
	TestService::Stub , grpc::ClientContext , void *)> start_req_;
	grpc::Status status_;
	double start_;
	std::unique_ptr<grpc::ClientAsyncReaderWriter<RequestType,ResponseType>>
	stream_;
	};

	class AsyncStreamingClient GRPC_FINAL : public Client {
	public:
	explicit AsyncStreamingClient(const ClientConfig &config) : Client(config) {
	for (int i = 0; i < config.async_client_threads(); i++) {
	cli_cqs_.emplace_back(new CompletionQueue);
	}

	auto payload_size = config.payload_size();
	auto check_done = [payload_size](grpc::Status s, SimpleResponse *response) {
	GPR_ASSERT(s.IsOk() && (response->payload().type() ==
	grpc::testing::PayloadType::COMPRESSABLE) &&
	(response->payload().body().length() ==
	static_cast<size_t>(payload_size)));
	};

	int t = 0;
	for (int i = 0; i < config.outstanding_rpcs_per_channel(); i++) {
	for (auto channel = channels_.begin(); channel != channels_.end();
	channel++) {
	auto* cq = cli_cqs_[t].get();
	t = (t + 1) % cli_cqs_.size();
	auto start_req = [cq](TestService::Stub stub, grpc::ClientContext ctx,
	void *tag) {
	auto stream = stub->AsyncStreamingCall(ctx, cq, tag);
	return stream;
	};

	TestService::Stub *stub = channel->get_stub();
	const SimpleRequest &request = request_;
	new ClientRpcContextStreamingImpl<SimpleRequest, SimpleResponse>(
	stub, request, start_req, check_done);
	}
	}

	StartThreads(config.async_client_threads());
	}

	~AsyncStreamingClient() GRPC_OVERRIDE {
	EndThreads();

	for (auto cq = cli_cqs_.begin(); cq != cli_cqs_.end(); cq++) {
	(*cq)->Shutdown();
	void *got_tag;
	bool ok;
	while ((*cq)->Next(&got_tag, &ok)) {
	delete ClientRpcContext::detag(got_tag);
	}
	}
	}

	void ThreadFunc(Histogram *histogram, size_t thread_idx) GRPC_OVERRIDE {
	void *got_tag;
	bool ok;
	cli_cqs_[thread_idx]->Next(&got_tag, &ok);

	ClientRpcContext *ctx = ClientRpcContext::detag(got_tag);
	if (ctx->RunNextState(ok, histogram) == false) {
	// call the callback and then delete it
	ctx->RunNextState(ok, histogram);
	ctx->StartNewClone();
	delete ctx;
	}
	}

	std::vector<std::unique_ptr<CompletionQueue>> cli_cqs_;
	};

	std::unique_ptr<Client> CreateAsyncUnaryClient(const ClientConfig& args) {
	return std::unique_ptr<Client>(new AsyncUnaryClient(args));
	}
	std::unique_ptr<Client> CreateAsyncStreamingClient(const ClientConfig& args) {
	return std::unique_ptr<Client>(new AsyncStreamingClient(args));
	}

	} // namespace testing
	} // namespace grpc