MessageSizeTraits.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
//
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#pragma once

#include <OnixS/CME/ConflatedTCP/ABI.h>
#include <OnixS/CME/ConflatedTCP/Compiler.h>

#include <OnixS/CME/ConflatedTCP/messaging/Composites.h>
#include <OnixS/CME/ConflatedTCP/messaging/Forwards.h>


ONIXS_CONFLATEDTCP_MESSAGING_NAMESPACE_BEGIN

#if defined(ONIXS_CONFLATEDTCP_COMPILER_CXX_CONSTEXPR) && ONIXS_CONFLATEDTCP_COMPILER_CXX_CONSTEXPR

/// Assume the credentials filed of the message is empty.
template <typename Message>
struct HasEmptyCredentials
{
    static constexpr bool UseCustomValue = true;

    static constexpr
    UInt16 calculateMaxMessageSize()
    {
        return
            Message::blockLength(Message::Schema::Version)
            + MessageHeader::Size
            + Message::getMinimalVariableFieldsSize(Message::Schema::Version);
    }
};

/// Assume the message has a constant size.
template <typename Message>
struct HasNoVariableFieldsOrGroups
{
    static constexpr bool UseCustomValue = true;

    static constexpr
        UInt16 calculateMaxMessageSize()
    {
        return
            Message::blockLength(Message::Schema::Version)
            + MessageHeader::Size;
    }
};

/// Traits for calculating the buffer size of a message.
template <typename Message> struct MaxMessageSizeTraits;

/// \private
template <>
struct MaxMessageSizeTraits<Negotiate200> : HasEmptyCredentials<Negotiate200> {};

/// \private
template <>
struct MaxMessageSizeTraits<Terminate203> : HasNoVariableFieldsOrGroups<Terminate203> {};

#endif

ONIXS_CONFLATEDTCP_MESSAGING_NAMESPACE_END