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From zuyu <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #232: QUICKSTEP-87 Adds network cli interfa...
Date Sun, 23 Apr 2017 06:54:41 GMT
Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/232#discussion_r112819466
  
    --- Diff: cli/IOInterface.hpp ---
    @@ -0,0 +1,82 @@
    +/**
    + * 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_IO_INTERFACE_HPP_
    +#define QUICKSTEP_CLI_IO_INTERFACE_HPP_
    +
    +#include <cstdio>
    +#include <string>
    +
    +#include "utility/Macros.hpp"
    +
    +namespace quickstep {
    +
    +/**
    + * An individual IO interaction with Quickstep.
    + */
    +class IOHandle {
    + public:
    +  IOHandle() {}
    +
    +  /**
    +   * @note Destructor should handle clean up of any IO state.
    +   */
    +  virtual ~IOHandle() {}
    +
    +  /**
    +   * @return A file handle for standard output.
    +   */
    +  virtual FILE *out() = 0;
    +
    +  /**
    +   * @return A file handle for error output.
    +   */
    +  virtual FILE *err() = 0;
    +
    +  virtual std::string getCommand() = 0;
    +
    + private:
    +  DISALLOW_COPY_AND_ASSIGN(IOHandle);
    +};
    +
    +/**
    + * Virtual base defines a generic, file-based interface around IO. One IO interaction
(eg a SQL query) will be assigned
    + * an IOHandle. On destruction of the IOHandle, the IO interaction has finished.
    + */
    +class IOInterface {
    + public:
    +  IOInterface() {}
    +
    +  /**
    +   * @note Destructing the IOInterface should close any outstanding IO state (eg an open
port).
    +   */
    +  virtual ~IOInterface() {}
    +
    +  /**
    +   * @brief Retrieves the next IOHandle. Blocks if no IO ready.
    +   * @return An IOHandle.
    +   */
    +  virtual IOHandle* getNextIOHandle() = 0;
    + private:
    --- End diff --
    
    Add an empty line above.


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