SessionStorage.h

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#pragma once

/*
* Copyright Onix Solutions Limited [OnixS]. All rights reserved.
*
* This software owned by Onix Solutions Limited [OnixS] and is protected by copyright law
* and international copyright treaties.
*
* Access to and use of the software is governed by the terms of the applicable OnixS Software
* Services Agreement (the Agreement) and Customer end user license agreements granting
* a non-assignable, non-transferable and non-exclusive license to use the software
* for it's own data processing purposes under the terms defined in the Agreement.
*
* Except as otherwise granted within the terms of the Agreement, copying or reproduction of any part
* of this source code or associated reference material to any other location for further reproduction
* or redistribution, and any amendments to this copyright notice, are expressly prohibited.
*
* Any reproduction or redistribution for sale or hiring of the Software not in accordance with
* the terms of the Agreement is a violation of copyright law.
*/

#include <OnixS/CME/ConflatedTCP/ABI.h>
#include <OnixS/CME/ConflatedTCP/Messaging.h>
#include <OnixS/CME/ConflatedTCP/messaging/Integral.h>
#include <OnixS/CME/ConflatedTCP/messaging/Time.h>
#include <OnixS/CME/ConflatedTCP/messaging/SbeMessage.h>

#include <string>
#include <vector>

namespace OnixS {
namespace CME {
namespace ConflatedTCP {

using namespace OnixS::CME::ConflatedTCP::Messaging;

/// Session Storage Type.
struct SessionStorageType
{
    enum Enum
    {
        /// Undefined Session Storage.
        Undefined = 0,

        /// File-based Session Storage.
        FileBased,

        /// Asynchronous File-Based Session Storage.
        AsyncFileBased,

        /// Memory-based Session Storage.
        MemoryBased,

        /// Pluggable Session Storage
        Pluggable
    };

    ONIXS_CONFLATEDTCP_EXPORTED static Enum parse(const std::string &);

    /// \return the session storage type as a string.
    ONIXS_CONFLATEDTCP_EXPORTED static const char * toString(SessionStorageType::Enum);
};

/// Session's storage.
class ONIXS_CONFLATEDTCP_EXPORTED SessionStorage
{
public:

    /// Destructor.
    virtual ~SessionStorage() ONIXS_CONFLATEDTCP_DEFAULT;

    /// \return Storage Id.
    virtual const std::string & id() const = 0;

    /// \return Universally Unique Identifier (UUID).
    virtual UInt64 uuid() const = 0;

    /// Sets Universally Unique Identifier (UUID).
    virtual void uuid(UInt64 value) = 0;

     /**
     * \return The UUID from the previously Established session.
     *
     * - This can be the CME assigned default UUID=0 for messages published by CME before first Negotiation of customer at the beginning of the week.
     * - This can be the last UUID as used by the customer from the previously Established session.
     */
    virtual UInt64 previousUuid() const = 0;

    /// Sets the UUID from the previously Established session.
    virtual void previousUuid(UInt64 value) = 0;

    /// \return the expected sequence number of the next inbound message.
    virtual SeqNumber inSeqNum() const = 0;

    /// Sets the expected sequence number of the next inbound message.
    virtual void inSeqNum(SeqNumber msgSeqNum) = 0;

     /**
     * \return the sequence number of the last business message published by CME with the PreviousUUID.
     *
     *  If no business message was published, the value is zero.
     */
    virtual SeqNumber previousSeqNum() const = 0;

    /// Sets the sequence number of the last business message published by CME with the PreviousUUID.
    virtual void previousSeqNum(SeqNumber msgSeqNum) = 0;

    /// \return the sequence number of the next outgoing message.
    virtual SeqNumber outSeqNum() const = 0;

    /// Sets the sequence number of the next outgoing message.
    virtual void outSeqNum(SeqNumber msgSeqNum) = 0;

    /// \return `true` if the logical session that used this storage was terminated and the storage can be cleaned up, otherwise - `false`.
    virtual bool terminated() const = 0;

    /// Sets the Session Termination status.
    virtual void terminated(bool terminated) = 0;

    /// \return the session creation time.
    virtual Timestamp sessionCreationTime() const = 0;

    /// Sets the session creation time.
    virtual void sessionCreationTime(Timestamp) = 0;

    /// Clears the storage.
    virtual void clear() = 0;

    /// Closes the storage.
    virtual void close(bool terminate = false, bool doBackup = false) = 0;

     /// Pointer to the SBE Message.
    struct RawMessagePointer
    {
        RawMessagePointer(const char *buffer = ONIXS_CONFLATEDTCP_NULLPTR, size_t length = 0)
          : buffer_(buffer)
          , length_(length)
        {}

        /// \note the buffer is NOT owned by the RawMessagePointer.
        const char *buffer_;

        size_t length_;
    };

    /// Logs the given inbound message.
    virtual void storeInboundMessage(const RawMessagePointer & rawMsg, SeqNumber msgSeqNum, bool isOriginal, Timestamp messageReceivingUtcTimestamp = Timestamp()) = 0;

    /// Logs the given outgoing message.
    virtual void storeOutboundMessage(const RawMessagePointer & rawMsg, SeqNumber msgSeqNum, bool isOriginal = true, bool warmUp = false, Timestamp messageSendingUtcTimestamp = Timestamp()) = 0;

    /// Flushes all internal buffers.
    virtual void flush() = 0;
};

}
}
}