HandlerStateChangeListener.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/Senaf/MarketData/Export.h>
#include <OnixS/Senaf/MarketData/HandlerState.h>

#include <string>

namespace OnixS { namespace Senaf { namespace MarketData {

/// \brief Defines the interface through which the Handler
/// notifies subscribers about Handler state change events.
class ONIXS_BME_SENAF_EXPORT HandlerStateChange
{
public:
    /// Initialize instance.
    HandlerStateChange(HandlerState newState, HandlerState oldState);

    /// New State.
    HandlerState newState() const;

    /// Old state.
    HandlerState oldState() const;

    /// String representation.
    std::string toString() const;

    /// Appends string representation.
    void toString(std::string&) const;

private:
    HandlerState newState_;
    HandlerState oldState_;

    HandlerStateChange(const HandlerStateChange&);

    HandlerStateChange& operator=(const HandlerStateChange&);
};

inline HandlerState HandlerStateChange::newState() const
{
    return newState_;
}

inline HandlerState HandlerStateChange::oldState() const
{
    return oldState_;
}

inline std::string HandlerStateChange::toString() const
{
    std::string str;

    toString(str);

    return str;
}

/// Handler state change listener.
class ONIXS_BME_SENAF_EXPORT HandlerStateChangeListener
{
public:
    /// Is called when the handler state is changed.
    ///
    /// \param change State change attributes.
    virtual void onHandlerStateChange(const HandlerStateChange& change) = 0;

protected:
    virtual ~HandlerStateChangeListener() {}
};

}}} // namespace OnixS::Senaf::MarketData