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 *
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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#include <cassert>
#include <chrono>
#include <memory>
#include <mutex>
#include <string>
#include <thread>
#include <vector>
#include <sstream>

#include <sys/signal.h>

#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/histogram.h>
#include <grpc/support/log.h>
#include <grpc/support/host_port.h>
#include <gflags/gflags.h>
#include <grpc++/client_context.h>
#include <grpc++/server.h>
#include <grpc++/server_builder.h>
#include <grpc++/status.h>
#include <grpc++/stream.h>
#include <gtest/gtest.h>
#include "test/cpp/util/create_test_channel.h"
#include "test/cpp/qps/client.h"
#include "test/cpp/qps/qpstest.grpc.pb.h"
#include "test/cpp/qps/histogram.h"
#include "test/cpp/qps/interarrival.h"
#include "test/cpp/qps/timer.h"

namespace grpc {
namespace testing {

class SynchronousClient : public Client {
 public:
  SynchronousClient(const ClientConfig& config) : Client(config) {
    num_threads_ =
        config.outstanding_rpcs_per_channel() * config.client_channels();
    responses_.resize(num_threads_);
    SetupLoadTest(config, num_threads_);
  }

  virtual ~SynchronousClient(){};

 protected:
  void WaitToIssue(int thread_idx) {
    grpc_time next_time;
    if (NextIssueTime(thread_idx, &next_time)) {
      std::this_thread::sleep_until(next_time);
    }
  }

  size_t num_threads_;
  std::vector<SimpleResponse> responses_;
};

class SynchronousUnaryClient GRPC_FINAL : public SynchronousClient {
 public:
  SynchronousUnaryClient(const ClientConfig& config)
      : SynchronousClient(config) {
    StartThreads(num_threads_);
  }
  ~SynchronousUnaryClient() { EndThreads(); }

  bool ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
    WaitToIssue(thread_idx);
    auto* stub = channels_[thread_idx % channels_.size()].get_stub();
    double start = Timer::Now();
    grpc::ClientContext context;
    grpc::Status s =
        stub->UnaryCall(&context, request_, &responses_[thread_idx]);
    histogram->Add((Timer::Now() - start) * 1e9);
    return s.IsOk();
  }
};

class SynchronousStreamingClient GRPC_FINAL : public SynchronousClient {
 public:
  SynchronousStreamingClient(const ClientConfig& config)
      : SynchronousClient(config),
        context_(num_threads_),
        stream_(num_threads_) {
    for (size_t thread_idx = 0; thread_idx < num_threads_; thread_idx++) {
      auto* stub = channels_[thread_idx % channels_.size()].get_stub();
      stream_[thread_idx] = stub->StreamingCall(&context_[thread_idx]);
    }
    StartThreads(num_threads_);
  }
  ~SynchronousStreamingClient() {
    EndThreads();
    for (auto stream = stream_.begin(); stream != stream_.end(); stream++) {
      if (*stream) {
        (*stream)->WritesDone();
        EXPECT_TRUE((*stream)->Finish().IsOk());
      }
    }
  }

  bool ThreadFunc(Histogram* histogram, size_t thread_idx) GRPC_OVERRIDE {
    WaitToIssue(thread_idx);
    double start = Timer::Now();
    if (stream_[thread_idx]->Write(request_) &&
        stream_[thread_idx]->Read(&responses_[thread_idx])) {
      histogram->Add((Timer::Now() - start) * 1e9);
      return true;
    }
    return false;
  }

 private:
  std::vector<grpc::ClientContext> context_;
  std::vector<std::unique_ptr<
      grpc::ClientReaderWriter<SimpleRequest, SimpleResponse>>> stream_;
};

std::unique_ptr<Client> CreateSynchronousUnaryClient(
    const ClientConfig& config) {
  return std::unique_ptr<Client>(new SynchronousUnaryClient(config));
}
std::unique_ptr<Client> CreateSynchronousStreamingClient(
    const ClientConfig& config) {
  return std::unique_ptr<Client>(new SynchronousStreamingClient(config));
}

}  // namespace testing
}  // namespace grpc