ActiveState!

ActivePerl Documentation
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 POE::Wheel::ListenAccept - POE Listen/Accept Logic Abstraction


NAME

POE::Wheel::ListenAccept - POE Listen/Accept Logic Abstraction


SUPPORTED PLATFORMS

  • Linux
  • Solaris
  • Windows
This module is not included with the standard ActivePerl distribution. It is available as a separate download using PPM.

SYNOPSIS

  $wheel = new POE::Wheel::ListenAccept(
    Handle      => $socket_handle,      # Listening socket
    AcceptState => $accept_state_name,  # Success state
    ErrorState  => $error_state_name,   # Failure state
  );
  $wheel->event( AcceptState => $new_state_name ); # Add/change state
  $wheel->event( ErrorState  => undef );           # Remove state


DESCRIPTION

ListenAccept waits for activity on a listening socket and accepts remote connections as they arrive. It generates events for successful and failed connections (EAGAIN is not considered to be a failure).

This wheel neither needs nor includes a put() method.

ListenAccept is a good way to listen on sockets from other sources, such as IO::Socket or plain socket() calls.


PUBLIC METHODS

POE::Wheel::ListenAccept::event( ... )

The event() method changes the events that a ListenAccept wheel emits for different conditions. It accepts a list of event types and values. Defined state names change the previous values. Undefined ones turn off the given condition's events.

For example, this event() call changes a wheel's AcceptState event and turns off its ErrorState event.

  $wheel->event( AcceptState => $new_accept_state_name,
                 ErrorState  => undef
               );


EVENTS AND PARAMETERS

  • AcceptState

    The AcceptState event contains the name of the state that will be called when a new connection has been accepted.

    The ARG0 parameter contains the accepted connection's new socket handle.

    A sample AcceptState state:

      sub accept_state {
        my $accepted_handle = $_[ARG0];
        # Optional security things with getpeername might go here.
        &create_server_session($handle);
      }

  • ErrorState

    The ErrorState event contains the name of the state that will be called when a socket error occurs. The ListenAccept wheel knows what to do with EAGAIN, so it's not considered an error worth reporting.

    The ARG0 parameter contains the name of the function that failed. This usually is 'accept'. ARG1 and ARG2 contain the numeric and string versions of $! at the time of the error, respectively.

    A sample ErrorState state:

      sub error_state {
        my ($operation, $errnum, $errstr) = @_[ARG0, ARG1, ARG2];
        warn "$operation error $errnum: $errstr\n";
      }


SEE ALSO

POE::Wheel; POE::Wheel::FollowTail; POE::Wheel::ReadWrite; POE::Wheel::SocketFactory


BUGS

Oh, probably some.


AUTHORS & COPYRIGHTS

Please see the POE manpage.

 POE::Wheel::ListenAccept - POE Listen/Accept Logic Abstraction