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// AsyncChannel.h
//
// $Id: //poco/1.3/Foundation/include/Poco/AsyncChannel.h#2 $
//
// Library: Foundation
// Package: Logging
// Module: AsyncChannel
//
// Definition of the AsyncChannel class.
//
// Copyright (c) 2004-2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Foundation_AsyncChannel_INCLUDED
#define Foundation_AsyncChannel_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Channel.h"
#include "Poco/Thread.h"
#include "Poco/Mutex.h"
#include "Poco/Runnable.h"
#include "Poco/NotificationQueue.h"
namespace Poco {
class Foundation_API AsyncChannel: public Channel, public Runnable
/// A channel uses a separate thread for logging.
///
/// Using this channel can help to improve the performance of
/// applications that produce huge amounts of log messages or
/// that write log messages to multiple channels simultaneously.
///
/// All log messages are put into a queue and this queue is
/// then processed by a separate thread.
{
public:
AsyncChannel(Channel* pChannel = 0, Thread::Priority prio = Thread::PRIO_NORMAL);
/// Creates the AsyncChannel and connects it to
/// the given channel.
void setChannel(Channel* pChannel);
/// Connects the AsyncChannel to the given target channel.
/// All messages will be forwarded to this channel.
Channel* getChannel() const;
/// Returns the target channel.
void open();
/// Opens the channel and creates the
/// background ;ogging thread.
void close();
/// Closes the channel and stops the background
/// logging thread.
void log(const Message& msg);
/// Queues the message for processing by the
/// background thread.
void setProperty(const std::string& name, const std::string& value);
/// Sets or changes a configuration property.
///
/// The "channel" property allows setting the target
/// channel via the LoggingRegistry.
/// The "channel" property is set-only.
///
/// The "priority" property allows setting the thread
/// priority. The following values are supported:
/// * lowest
/// * low
/// * normal (default)
/// * high
/// * highest
///
/// The "priority" property is set-only.
protected:
~AsyncChannel();
void run();
void setPriority(const std::string& value);
private:
Channel* _pChannel;
Thread _thread;
FastMutex _mutex;
NotificationQueue _queue;
};
} // namespace Poco
#endif // Foundation_AsyncChannel_INCLUDED
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