Library: Foundation
Package: Logging
Header: Poco/AsyncChannel.h
Description
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.
Inheritance
Direct Base Classes: Channel, Runnable
All Base Classes: Channel, Configurable, RefCountedObject, Runnable
Member Summary
Member Functions: close, getChannel, log, open, run, setChannel, setPriority, setProperty
Inherited Functions: close, duplicate, getProperty, log, open, referenceCount, release, run, setProperty
Types Aliases
Ptr
using Ptr = AutoPtr < AsyncChannel >;
Constructors
AsyncChannel
AsyncChannel(
Channel::Ptr pChannel = 0,
Thread::Priority prio = Thread::PRIO_NORMAL
);
Creates the AsyncChannel and connects it to the given channel.
Destructor
~AsyncChannel 
~AsyncChannel();
Member Functions
close
void close();
Closes the channel and stops the background logging thread.
See also: Poco::Channel::close()
getChannel
Channel::Ptr getChannel() const;
Returns the target channel.
log
void log(
const Message & msg
);
Queues the message for processing by the background thread.
See also: Poco::Channel::log()
open
void open();
Opens the channel and creates the background logging thread.
See also: Poco::Channel::open()
setChannel
void setChannel(
Channel::Ptr pChannel
);
Connects the AsyncChannel to the given target channel. All messages will be forwarded to this channel.
setProperty
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.
The "queueSize" property allows to limit the number of messages in the queue. If the queue is full and new messages are logged, these are dropped until the queue has free capacity again. The number of dropped messages is recorded, and a log message indicating the number of dropped messages will be generated when the queue has free capacity again. In addition to an unsigned integer specifying the size, this property can have the values "none" or "unlimited", which disable the queue size limit. A size of 0 also removes the limit.
The "queueSize" property is set-only.
See also: Poco::Channel::setProperty()
run
void run();
See also: Poco::Runnable::run()
setPriority
void setPriority(
const std::string & value
);