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123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
//
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// AsyncChannel.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/AsyncChannel.h#2 $
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//
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// Library: Foundation
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// Package: Logging
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// Module: AsyncChannel
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//
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// Definition of the AsyncChannel class.
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//
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// Copyright (c) 2004-2007, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_AsyncChannel_INCLUDED
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#define Foundation_AsyncChannel_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Channel.h"
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#include "Poco/Thread.h"
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#include "Poco/Mutex.h"
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#include "Poco/Runnable.h"
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#include "Poco/NotificationQueue.h"
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namespace Poco {
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class Foundation_API AsyncChannel: public Channel, public Runnable
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/// A channel uses a separate thread for logging.
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///
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/// Using this channel can help to improve the performance of
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/// applications that produce huge amounts of log messages or
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/// that write log messages to multiple channels simultaneously.
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///
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/// All log messages are put into a queue and this queue is
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/// then processed by a separate thread.
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{
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public:
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AsyncChannel(Channel* pChannel = 0, Thread::Priority prio = Thread::PRIO_NORMAL);
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/// Creates the AsyncChannel and connects it to
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/// the given channel.
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void setChannel(Channel* pChannel);
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/// Connects the AsyncChannel to the given target channel.
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/// All messages will be forwarded to this channel.
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Channel* getChannel() const;
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/// Returns the target channel.
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void open();
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/// Opens the channel and creates the
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/// background logging thread.
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void close();
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/// Closes the channel and stops the background
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/// logging thread.
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void log(const Message& msg);
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/// Queues the message for processing by the
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/// background thread.
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void setProperty(const std::string& name, const std::string& value);
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/// Sets or changes a configuration property.
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///
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/// The "channel" property allows setting the target
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/// channel via the LoggingRegistry.
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/// The "channel" property is set-only.
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///
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/// The "priority" property allows setting the thread
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/// priority. The following values are supported:
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/// * lowest
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/// * low
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/// * normal (default)
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/// * high
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/// * highest
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///
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/// The "priority" property is set-only.
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protected:
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~AsyncChannel();
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void run();
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void setPriority(const std::string& value);
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private:
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Channel* _pChannel;
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Thread _thread;
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FastMutex _threadMutex;
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FastMutex _channelMutex;
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NotificationQueue _queue;
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};
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} // namespace Poco
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#endif // Foundation_AsyncChannel_INCLUDED
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