ClickHouse/base/poco/Foundation/include/Poco/FormattingChannel.h

//
// FormattingChannel.h
//
// Library: Foundation
// Package: Logging
// Module:  Formatter
//
// Definition of the FormattingChannel class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_FormattingChannel_INCLUDED
#define Foundation_FormattingChannel_INCLUDED


#include "Poco/Channel.h"
#include "Poco/Foundation.h"


namespace Poco
{


class Formatter;


class Foundation_API FormattingChannel : public Channel
/// The FormattingChannel is a filter channel that routes
/// a Message through a Formatter before passing it on
/// to the destination channel.
{
public:
    FormattingChannel();
    /// Creates a FormattingChannel.

    FormattingChannel(Formatter * pFormatter);
    /// Creates a FormattingChannel and attaches a Formatter.

    FormattingChannel(Formatter * pFormatter, Channel * pChannel);
    /// Creates a FormattingChannel and attaches a Formatter
    /// and a Channel.

    void setFormatter(Formatter * pFormatter);
    /// Sets the Formatter used to format the messages
    /// before they are passed on. If null, the message
    /// is passed on unmodified.

    Formatter * getFormatter() const;
    /// Returns the Formatter used to format messages,
    /// which may be null.

    void setChannel(Channel * pChannel);
    /// Sets the destination channel to which the formatted
    /// messages are passed on.

    Channel * getChannel() const;
    /// Returns the channel to which the formatted
    /// messages are passed on.

    void log(const Message & msg);
    /// Formats the given Message using the Formatter and
    /// passes the formatted message on to the destination
    /// Channel.

    void setProperty(const std::string & name, const std::string & value);
    /// Sets or changes a configuration property.
    ///
    /// Only the "channel" and "formatter" properties are supported, which allow
    /// setting the target channel and formatter, respectively, via the LoggingRegistry.
    /// The "channel" and "formatter" properties are set-only.
    ///
    /// Unsupported properties are passed to the attached Channel.

    void open();
    /// Opens the attached channel.

    void close();
    /// Closes the attached channel.

protected:
    ~FormattingChannel();

private:
    Formatter * _pFormatter;
    Channel * _pChannel;
};


} // namespace Poco


#endif // Foundation_FormattingChannel_INCLUDED