IO::Async::Protocol(3pm) User Contributed Perl Documentation IO::Async::Protocol(3pm)
NAME
"IO::Async::Protocol" - base class for transport-based protocols
DESCRIPTION
This subclass of IO::Async:Notifier provides storage for a IO::Async::Handle object, to act as a transport for some protocol. It contains
an instance of the transport object, which it adds as a child notifier, allowing a level of independence from the actual transport being
used. For example, a stream may actually be an IO::Async::SSLStream to allow the protocol to be used over SSL.
This class is not intended to be used directly, instead, see one of the subclasses
IO::Async::Protocol::Stream - base class for stream-based protocols
EVENTS
The following events are invoked, either using subclass methods or CODE references in parameters:
on_closed
Optional. Invoked when the transport handle becomes closed.
PARAMETERS
The following named parameters may be passed to "new" or "configure":
transport => IO::Async::Handle
The "IO::Async::Handle" to delegate communications to.
on_closed => CODE
CODE reference for the "on_closed" event.
When a new "transport" object is given, it will be configured by calling the "setup_transport" method, then added as a child notifier. If a
different transport object was already configured, this will first be removed and deconfigured using the "teardown_transport".
METHODS
$transport = $protocol->transport
Returns the stored transport object
$protocol->connect( %args )
Sets up a connection to a peer, and configures the underlying "transport" for the Protocol.
Takes the following named arguments:
socktype => STRING or INT
Required. Identifies the socket type, and the type of continuation that will be used. If this value is "stream" or "SOCK_STREAM"
then "on_stream" continuation will be used; otherwise "on_socket" will be used.
on_connected => CODE
Optional. If supplied, will be invoked once the connection has been established.
$on_connected->( $protocol )
transport => IO::Async::Handle
Optional. If this is provided, it will immediately be configured as the transport (by calling "configure"), and the "on_connected"
callback will be invoked. This is provided as a convenient shortcut.
Other arguments will be passed to the underlying "IO::Async::Loop" "connect" call.
TRANSPORT DELEGATION
The following methods are delegated to the transport object
close
SUBCLASS METHODS
"IO::Async::Protocol" is a base class provided so that specific subclasses of it provide more specific behaviour. The base class provides a
number of methods that subclasses may wish to override.
If a subclass implements any of these, be sure to invoke the superclass method at some point within the code.
$protocol->setup_transport( $transport )
Called by "configure" when a new "transport" object is given, this method should perform whatever setup is required to wire the new
transport object into the protocol object; typically by setting up event handlers.
$protocol->teardown_transport( $transport )
The reverse of "setup_transport"; called by "configure" when a previously set-up transport object is about to be replaced.
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-10-24 IO::Async::Protocol(3pm)