LogReplayInputStream.h

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/*
 * Copyright (c) Onix Solutions Limited. All rights reserved.
 *
 * This software owned by Onix Solutions Limited 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.
 */

#pragma once

#include <cstddef>

namespace OnixS { namespace ICE { namespace iMpact { namespace MarketData {

/// Log replay input stream.
class LogReplayInputStream
{
public:
    /**
     * Called when log player wants to read data from stream.
     *
     * \param data buffer to read data into
     * \param size max size to read
     *
     * \returns \c 0 in case of EOF, actually read bytes count otherwise
     *
     * \note Implementation is free to throw any exceptions.
     * Player would react differently depending on exception type.
     *
     * Particularly:
     * - \c std::ios_base::failure -- serious problem on getting data means
     *   do not try any further reading from stream and terminate playing;
     *
     * Absolutely all exceptions are reported via error handler.
     * Description string will be available for children of \c std::exception.
     */
    virtual std::size_t read(char* const data, std::size_t size) = 0;

protected:
    /// Deletion is not supposed through interface of this class.
    virtual ~LogReplayInputStream() {}
};

}}}} // namespace OnixS::ICE::iMpact::MarketData