ErrorListener.h

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/*
 * 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.
 */

#pragma once

#include "OnixS/Eurex/Trading/Export.h"

#include <string>

namespace OnixS { namespace Eurex { namespace Trading {

/// Known (selected) error codes.
struct ONIXS_EUREX_ETI_EXPORT ErrorCode
{
    /// \copydoc ErrorCode
    enum Enum
    {
        General = 1,  ///< Generic issues.
        Protocol = 2, ///< Eurex ETI protocol issues.
    };
};

/// Returns string representation of ErrorCode value.
ONIXS_EUREX_ETI_EXPORT std::string enumToString(ErrorCode::Enum);

/// Make it printable using C++ I/O streams.
ONIXS_EUREX_ETI_EXPORT std::ostream& operator<<(std::ostream&, ErrorCode::Enum);

/// Defines an interface through which the Handler notifies subscribers
/// about errors occurred while processing messages.
class ErrorListener
{
public:
    /// Implement this member to get notified about errors.
    /// \param code identifies error occurred while processing messages.
    /// \param description supplies notes on occurred error.
    /// \note Usually, Handler is capable to recover from errors by itself.
    /// That means, there's no need to restart manually.
    /// Instead, Handler will perform all necessary recovering by itself.
    virtual void onError(ErrorCode::Enum code, const std::string& description) = 0;

protected:
    /// Class provides an interface for handling errors in subscriptions.
    /// It doesn't provide an interface for instance deletion. However,
    /// since C++ doesn't have pure interface concept, destructor will be
    /// generated anyway. We can only control proper use of it. For this
    /// reason we hide from public use and make it available for descendants.
    virtual ~ErrorListener() {}
};
}}} // namespace OnixS::Eurex::Trading