IO::Async::Protocol - base class for transport-based protocols
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
The following events are invoked, either using subclass methods or CODE references in parameters:
Optional. Invoked when the transport handle becomes closed.
The following named parameters may be passed to
IO::Async::Handle to delegate communications to.
CODE reference for the
When a new
transport object is given,
it will be configured by calling the
then added as a child notifier.
If a different transport object was already configured,
this will first be removed and deconfigured using the
Returns the stored transport object
Sets up a connection to a peer,
and configures the underlying
transport for the Protocol.
Takes the following named arguments:
Identifies the socket type,
and the type of continuation that will be used.
If this value is
on_stream continuation will be used; otherwise
on_socket will be used.
Optional. If supplied, will be invoked once the connection has been established.
$on_connected->( $protocol )
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
The following methods are delegated to the transport object
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.
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.
The reverse of
setup_transport; called by
configure when a previously set-up transport object is about to be replaced.
Paul Evans <email@example.com>