EtpMessage.h

/*-----------------------------------------------------------------------
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to you under the Apache License, Version 2.0 (the
"License"; you may not use this file except in compliance
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  http://www.apache.org/licenses/LICENSE-2.0
 
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software distributed under the License is distributed on an
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specific language governing permissions and limitations
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#pragma once
 
#include <avro/Decoder.hh>
#include <avro/Encoder.hh>
#include <avro/Specific.hh>
 
namespace Energistics {
    namespace Etp {
        namespace v12 {
            namespace Datatypes {
                struct MessageHeader {
                    int32_t protocol = 0;
                    int32_t messageType = 0;
                    int64_t correlationId = 0;
                    int64_t messageId = 0;
                    int32_t messageFlags = 0;
                };
            }
        }
    }
}
namespace avro {
    template<> struct codec_traits<Energistics::Etp::v12::Datatypes::MessageHeader> {
        static void encode(Encoder& e, const Energistics::Etp::v12::Datatypes::MessageHeader& v) {
            avro::encode(e, v.protocol);
            avro::encode(e, v.messageType);
            avro::encode(e, v.correlationId);
            avro::encode(e, v.messageId);
            avro::encode(e, v.messageFlags);
        }
        static void decode(Decoder& e, Energistics::Etp::v12::Datatypes::MessageHeader& v) {
            avro::decode(e, v.protocol);
            avro::decode(e, v.messageType);
            avro::decode(e, v.correlationId);
            avro::decode(e, v.messageId);
            avro::decode(e, v.messageFlags);
        }
    };
}
 
namespace ETP_NS
{
    class EtpMessage
    {
    public:
 
        virtual ~EtpMessage() = default;
 
        std::shared_ptr<const std::vector<uint8_t>> encodeHeaderAndBody() {
            auto out = avro::memoryOutputStream();
            auto encoder = avro::binaryEncoder();
            encoder->init(*out);
 
            avro::encode(*encoder, messageHeader);
            encode(*encoder);
            encoder->flush();
 
            return avro::snapshot(*out);
        }
 
        virtual void encode(avro::Encoder&) const = 0;
        virtual void decode(avro::Decoder&) = 0;
 
        std::string to_string() const {
            std::ostringstream oss;
            oss << "*************************************************\n"
                << "Message Header put in the queue :\n"
                << "protocol : " << messageHeader.protocol << '\n'
                << "type : " << messageHeader.messageType << '\n'
                << "id : " << messageHeader.messageId << '\n'
                << "correlation id : " << messageHeader.correlationId << '\n'
                << "flags : " << messageHeader.messageFlags << '\n'
                << "*************************************************" << '\n'
                << body_to_string();
            return oss.str();
        }
 
        Energistics::Etp::v12::Datatypes::MessageHeader messageHeader;
 
    protected :
        virtual std::string body_to_string() const { return ""; }
    };
}