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/*
* Copyright (c) 2014, Ford Motor Company
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of the Ford Motor Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SRC_COMPONENTS_INCLUDE_PROTOCOL_MESSAGE_PRIORITY_H_
#define SRC_COMPONENTS_INCLUDE_PROTOCOL_MESSAGE_PRIORITY_H_
#include <cstddef>
#include "protocol/service_type.h"
namespace protocol_handler {
// Class for calculating and tracking message priorities in the system
// It was decided to wrap simple priority number into trivial class to
// Have all priority value calculations in single place and
// prevent random priorities assignment in the code
class MessagePriority {
public:
// Default (in other words non-prioritized) priority value
static const MessagePriority kDefault;
// Static constructor to get priority value of Service type
static MessagePriority FromServiceType(ServiceType service_type);
// Trivial inline copy constructor
MessagePriority(const MessagePriority &that);
// Ordering value which is used by queues to order messages
// Higher value means higher prioirty
size_t OrderingValue() const;
private:
// Constructor is private to prevent creation
// of random priorities in the code please use static constructor if you
// need priority value
explicit MessagePriority(int32_t value): value_(value) {}
size_t value_;
};
} // namespace protocol_handler
#endif // SRC_COMPONENTS_INCLUDE_PROTOCOL_MESSAGE_PRIORITY_H_
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