/******************************************************************************
 *                       ____    _    _____                                   *
 *                      / ___|  / \  |  ___|    C++                           *
 *                     | |     / _ \ | |_       Actor                         *
 *                     | |___ / ___ \|  _|      Framework                     *
 *                      \____/_/   \_|_|                                      *
 *                                                                            *
 * Copyright 2011-2018 Dominik Charousset                                     *
 *                                                                            *
 * Distributed under the terms and conditions of the BSD 3-Clause License or  *
 * (at your option) under the terms and conditions of the Boost Software      *
 * License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE.       *
 *                                                                            *
 * If you did not receive a copy of the license files, see                    *
 * http://opensource.org/licenses/BSD-3-Clause and                            *
 * http://www.boost.org/LICENSE_1_0.txt.                                      *
 ******************************************************************************/

#pragma once

#include "caf/byte_buffer.hpp"
#include "caf/intrusive_ptr.hpp"
#include "caf/io/fwd.hpp"
#include "caf/io/network/operation.hpp"
#include "caf/message.hpp"
#include "caf/ref_counted.hpp"

namespace caf::io::network {

/// A manager configures an I/O device and provides callbacks
/// for various I/O operations.
class manager : public ref_counted {
public:
  manager();

  ~manager() override;

  /// Sets the parent for this manager.
  /// @pre `parent() == nullptr`
  void set_parent(abstract_broker* ptr);

  /// Returns the parent broker of this manager.
  abstract_broker* parent();

  /// Returns `true` if this manager has a parent, `false` otherwise.
  inline bool detached() const {
    return !parent_;
  }

  /// Detach this manager from its parent and invoke `detach_message()``
  /// if `invoke_detach_message == true`.
  void detach(execution_unit* ctx, bool invoke_disconnect_message);

  /// Causes the manager to gracefully close its connection.
  virtual void graceful_shutdown() = 0;

  /// Removes the I/O device to the event loop of the middleman.
  virtual void remove_from_loop() = 0;

  /// Adds the I/O device to the event loop of the middleman.
  virtual void add_to_loop() = 0;

  /// Detaches this manager from its parent in case of an error.
  void io_failure(execution_unit* ctx, operation op);

protected:
  /// Creates a message signalizing a disconnect to the parent.
  virtual message detach_message() = 0;

  /// Detaches this manager from `ptr`.
  virtual void detach_from(abstract_broker* ptr) = 0;

  strong_actor_ptr parent_;
};

} // namespace caf
