LogEvents.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
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// in the Agreement.
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#pragma once

#include <OnixS/CME/Streamlined/String.h>
#include <OnixS/CME/Streamlined/Integral.h>
#include <OnixS/CME/Streamlined/Decimal.h>
#include <OnixS/CME/Streamlined/Time.h>

#include <OnixS/CME/Streamlined/Logger.h>

ONIXS_CMESTREAMLINEDMDH_NAMESPACE_BEGIN

/// By default, logging machinery provides access 
/// to the entry with ability to store arbitrary text. 
/// Given class adds basic information about time of 
/// entry record, category and source of log entry. 
/// It also enhances API with ability to put data into 
/// log entries in simple and elegant way by using 
/// streaming operators. 
ONIXS_CMESTREAMLINEDMDH_LTWT_CLASS LogEvent
{
    LogEntry& entry_;
    std::string& message_;

    // Object copying is not assumed. 

    LogEvent(const LogEvent&);
    LogEvent& operator =(const LogEvent&);

public:
    /// Initializes event with LogEntry instance. 
    LogEvent(
        LogEntry& entry,
        LogCategory::Enum category,
        const StrRef& source)
        : entry_(entry)
        , message_(entry.message())
    {
        entry_.category(category);
        entry_.source(source);
    }

    /// Commits entry to the log. 
    ~LogEvent()
    {
        entry_.commit();
    }

    /// Informational message to be added to a log. 
    std::string& message()
    {
        return message_;
    }

    /// Informational message to be added to a log. 
    const std::string& message() const
    {
        return message_;
    }
};

// A few descendants for a particular purposes.

/// Specializes LogEvent to log errors.
ONIXS_CMESTREAMLINEDMDH_LTWT_STRUCT LogError : LogEvent
{
    /// Initializes event as error.
    LogError(
        LogEntry& entry,
        const Char* source)
        : LogEvent(
            entry,
            LogCategory::Error,
            toStrRef(source))
    {
    }

    /// Initializes event as error.
    LogError(
        LogEntry& entry,
        const StrRef& source)
        : LogEvent(
            entry,
            LogCategory::Error,
            source)
    {
    }

    /// Initializes event as error.
    LogError(
        LogEntry& entry,
        const std::string& source)
        : LogEvent(
            entry,
            LogCategory::Error,
            toStrRef(source))
    {
    }
};

/// Specializes LogEvent to log warnings.
ONIXS_CMESTREAMLINEDMDH_LTWT_STRUCT LogWarning : LogEvent
{
    /// Initializes event as warning.
    LogWarning(
        LogEntry& entry,
        const Char* source)
        : LogEvent(
            entry,
            LogCategory::Warning,
            toStrRef(source))
    {
    }

    /// Initializes event as warning.
    LogWarning(
        LogEntry& entry,
        const StrRef& source)
        : LogEvent(
            entry,
            LogCategory::Warning,
            source)
    {
    }

    /// Initializes event as warning.
    LogWarning(
        LogEntry& entry,
        const std::string& source)
        : LogEvent(
            entry,
            LogCategory::Warning,
            toStrRef(source))
    {
    }
};

/// Specializes LogEvent to log informations.
ONIXS_CMESTREAMLINEDMDH_LTWT_STRUCT LogInfo : LogEvent
{
    /// Initializes event as information.
    LogInfo(
        LogEntry& entry,
        const Char* source)
        : LogEvent(
            entry,
            LogCategory::Info,
            toStrRef(source))
    {
    }

    /// Initializes event as information.
    LogInfo(
        LogEntry& entry,
        const StrRef& source)
        : LogEvent(
            entry,
            LogCategory::Info,
            source)
    {
    }

    /// Initializes event as information.
    LogInfo(
        LogEntry& entry,
        const std::string& source)
        : LogEvent(
            entry,
            LogCategory::Info,
            toStrRef(source))
    {
    }
};

/// Specializes LogEvent to log debug information.
ONIXS_CMESTREAMLINEDMDH_LTWT_STRUCT LogDebug : LogEvent
{
    /// Initializes event as debug information.
    LogDebug(
        LogEntry& entry,
        const Char* source)
        : LogEvent(
            entry,
            LogCategory::Debug,
            toStrRef(source))
    {
    }

    /// Initializes event as debug information.
    LogDebug(
        LogEntry& entry,
        const StrRef& source)
        : LogEvent(
            entry,
            LogCategory::Debug,
            source)
    {
    }

    /// Initializes event as debug information.
    LogDebug(
        LogEntry& entry,
        const std::string& source)
        : LogEvent(
            entry,
            LogCategory::Debug,
            toStrRef(source))
    {
    }
};

// Sugar-coat for adding basic type data to log entry. 

/// Prevents data of unrecognized type to be  
/// logged without properly defined serialization. 
template
<
    typename Undefined
>
LogEvent&
operator <<(
    LogEvent& event,
    Undefined undefined)
{
    struct 
    DefineOperatorForGivenType 
    {} 
    var = undefined;

    return event;
}

/// Logs zero-terminated string. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    const Char* cStr)
{
    event.message() += cStr;

    return event;
}

/// Logs standard string. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    const std::string& str)
{
    event.message() += str;

    return event;
}

/// Logs string by its reference. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    const StrRef& strRef)
{
    toStr(
        event.message(),
        strRef);

    return event;
}

/// Logs single character. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    Char character)
{
    event.message() += character;

    return event;
}

/// Logs an integer. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    Int8 number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

/// Logs an integer. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    UInt8 number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

/// Logs an integer. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    Int16 number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

/// Logs an integer. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    UInt16 number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

/// Logs an integer. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    Int32 number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

/// Logs an integer. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    UInt32 number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

/// Logs an integer. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    Int64 number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

/// Logs an integer. 
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    UInt64 number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

/// Logs decimal number. 
template 
<
    class Mantissa, 
    class Exponent
>
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    const 
    FixedPointDecimal
    <
        Mantissa, 
        Exponent
    >& number)
{
    toStr(
        event.message(), 
        number);

    return event;
}

// Logs timestamp.
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    const Timestamp& timestamp)
{
    toStr(
        event.message(), 
        timestamp);

    return event;
}

// Logs time span.
inline 
LogEvent&
operator <<(
    LogEvent& event, 
    const TimeSpan& timeSpan)
{
    toStr(
        event.message(), 
        timeSpan);

    return event;
}

ONIXS_CMESTREAMLINEDMDH_NAMESPACE_END