await_client_or_server.h

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/*
  Copyright (c) 2023, Oracle and/or its affiliates.
 
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  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  GNU General Public License for more details.
 
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*/
 
#ifndef ROUTING_CLASSIC_AWAIT_CLIENT_OR_SERVER_PROCESSOR_INCLUDED
#define ROUTING_CLASSIC_AWAIT_CLIENT_OR_SERVER_PROCESSOR_INCLUDED
 
#include "processor.h"
 
class AwaitClientOrServerProcessor : public BasicProcessor {
 public:
  enum class AwaitResult {
    ClientReadable,
    ServerReadable,
  };
 
  AwaitClientOrServerProcessor(
      MysqlRoutingClassicConnectionBase *conn,
      std::function<void(stdx::expected<AwaitResult, std::error_code>)> on_done)
      : BasicProcessor(conn), on_done_(std::move(on_done)) {}
 
  stdx::expected<Result, std::error_code> process() override;
 
 private:
  enum class Stage {
    Init,
    WaitBoth,
    WaitClientCancelled,
    WaitServerCancelled,
    Done,
  };
 
  void stage(Stage stage) { stage_ = stage; }
  Stage stage() const { return stage_; }
 
  stdx::expected<Result, std::error_code> init();
  stdx::expected<Result, std::error_code> wait_both();
  stdx::expected<Result, std::error_code> wait_client_cancelled();
  stdx::expected<Result, std::error_code> wait_server_cancelled();
 
  Stage stage_{Stage::Init};
 
  std::function<void(stdx::expected<AwaitResult, std::error_code>)> on_done_;
};
 
#endif