Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/232#discussion_r112418012
  
    --- Diff: cli/NetworkIO.hpp ---
    @@ -0,0 +1,227 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *   http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing,
    + * software distributed under the License is distributed on an
    + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    + * KIND, either express or implied.  See the License for the
    + * specific language governing permissions and limitations
    + * under the License.
    + **/
    +
    +#ifndef QUICKSTEP_CLI_NETWORK_IO_HPP_
    +#define QUICKSTEP_CLI_NETWORK_IO_HPP_
    +
    +#include <grpc++/grpc++.h>
    +
    +#include <iostream>
    +#include <memory>
    +#include <string>
    +#include <vector>
    +
    +#include "cli/Flags.hpp"
    +#include "cli/IOInterface.hpp"
    +#include "cli/NetworkCli.grpc.pb.h"
    +#include "cli/NetworkCli.pb.h"
    +#include "threading/ConditionVariable.hpp"
    +#include "threading/Mutex.hpp"
    +#include "utility/MemStream.hpp"
    +
    +#include "gflags/gflags.h"
    +#include "glog/logging.h"
    +
    +using grpc::Channel;
    +using grpc::ClientContext;
    +using grpc::Server;
    +using grpc::Status;
    +
    +namespace quickstep {
    +
    +namespace networkio_internal {
    +
    +/**
    + * Contains state and helper methods for managing interactions between a 
producer/consumer (requestor/requestee)
    + * thread.
    + */
    +class RequestState {
    + public:
    +  RequestState() :
    +    request_ready_(false),
    +    response_ready_(false),
    +    request_buffer_(""),
    +    mutex_(),
    +    condition_() {}
    +
    +  /**
    +   * Notifies waiter that a piece of work has been created and added to 
the buffer.
    +   * @param to_consume The arguments for the consuming thread.
    +   */
    +  void requestReady(std::string to_consume) {
    --- End diff --
    
    Change to `const std::string &to_consume`.


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