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122 lines
3.2 KiB
C++
122 lines
3.2 KiB
C++
//
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// AsyncChannel.h
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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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// SPDX-License-Identifier: BSL-1.0
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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/AutoPtr.h"
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#include "Poco/NotificationQueue.h"
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#include <atomic>
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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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using Ptr = AutoPtr<AsyncChannel>;
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AsyncChannel(Channel::Ptr 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::Ptr 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::Ptr 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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///
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/// The "queueSize" property allows to limit the number
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/// of messages in the queue. If the queue is full and
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/// new messages are logged, these are dropped until the
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/// queue has free capacity again. The number of dropped
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/// messages is recorded, and a log message indicating the
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/// number of dropped messages will be generated when the
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/// queue has free capacity again.
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/// In addition to an unsigned integer specifying the size,
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/// this property can have the values "none" or "unlimited",
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/// which disable the queue size limit. A size of 0 also
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/// removes the limit.
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///
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/// The "queueSize" 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::Ptr _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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std::size_t _queueSize = 0;
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std::size_t _dropCount = 0;
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std::atomic<bool> _closed;
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};
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} // namespace Poco
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#endif // Foundation_AsyncChannel_INCLUDED
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