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OS/2 Shareware BBS: 10 Tools
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Fnorb
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orb
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GIOPServerWorkerReactive.py
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1999-06-28
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#!/usr/bin/env python
#############################################################################
# Copyright (C) DSTC Pty Ltd (ACN 052 372 577) 1997, 1998, 1999
# All Rights Reserved.
#
# The software contained on this media is the property of the DSTC Pty
# Ltd. Use of this software is strictly in accordance with the
# license agreement in the accompanying LICENSE.HTML file. If your
# distribution of this software does not contain a LICENSE.HTML file
# then you have no rights to use this software in any manner and
# should contact DSTC at the address below to determine an appropriate
# licensing arrangement.
#
# DSTC Pty Ltd
# Level 7, GP South
# Staff House Road
# University of Queensland
# St Lucia, 4072
# Australia
# Tel: +61 7 3365 4310
# Fax: +61 7 3365 4311
# Email: enquiries@dstc.edu.au
#
# This software is being provided "AS IS" without warranty of any
# kind. In no event shall DSTC Pty Ltd be liable for damage of any
# kind arising out of or in connection with the use or performance of
# this software.
#
# Project: Fnorb
# File: $Source: /units/arch/src/Fnorb/orb/RCS/GIOPServerWorkerReactive.py,v $
# Version: @(#)$RCSfile: GIOPServerWorkerReactive.py,v $ $Revision: 1.5 $
#
#############################################################################
""" GIOPServerWorkerReactive class. """
# Fnorb modules.
import CORBA, EventHandler, GIOPServerWorker, GIOPConnectionHandler, Reactor
class GIOPServerWorkerReactive(GIOPServerWorker.GIOPServerWorker,
EventHandler.EventHandler):
""" GIOPServerWorkerReactive class.
A concrete 'EventHandler' in the 'Reactor' pattern.
This class is *not* thread safe, but since the whole point of the 'Reactor'
pattern is to work in a single-threaded environment, I don't see this as
much of a problem ;^)
"""
def __init__(self, giop_server, connection):
""" Provide an interface to a remote object!
'protocol' is the protocol used by this worker.
'connection' is the aconnection to the remote object.
"""
self.__giop_server = giop_server
self.__connection = connection
# Have we been closed down?
self.__closed = 0
# Set the connection to NON-blocking mode.
self.__connection.blocking(0)
# Queue of outgoing GIOP messages.
self.__outgoing = []
# Get a reference to the active reactor.
self.__reactor = Reactor.Reactor_init()
# Register our interest in read events (ie. operation requests) with
# the Reactor.
self.__reactor.register_handler(self, Reactor.READ)
# Create a handler to look after the connection.
self.__handler = GIOPConnectionHandler.GIOPConnectionHandler \
(self, self.__connection)
return
def pseudo__del__(self):
""" Pseudo destructor to remove circular references.
This method is called from '__shutdown' only.
"""
# The GIOP server holds a (circular) reference to this instance so we
# have to explicitly clean it up.
self.__giop_server.pseudo__del__()
# Clean up *our* reference to *it*!
del self.__giop_server
# The handler also holds a (circular) reference to this instance so we
# have to explicitly clean it up.
self.__handler.pseudo__del__()
# Clean up *our* reference to *it*!
del self.__handler
return
#########################################################################
# GIOPServerWorker interface.
#########################################################################
def send(self, message):
""" Send a message to the 'client'.
This method simply adds the message to the queue of outgoing messages
and registers out interest in write events with the Reactor.
"""
# Add the outgoing message to the queue.
self.__outgoing.append(message)
# Register my interest in write events with the Reactor.
self.__reactor.register_handler(self, Reactor.WRITE)
return
def close_connection(self):
""" Close down the worker.
Currently, Fnorb does not close down servers, so this is not used.
"""
if not self.__closed:
# Don't accept any more operation requests.
self.__reactor.unregister_handler(self, Reactor.READ)
# Send all outstanding messages.
while len(self.__outgoing) > 0:
self.__reactor.do_one_event()
# Close down the worker.
self.__close()
return
#########################################################################
# EventHandler interface.
#########################################################################
def handle_event(self, mask):
""" Callback method to handle all events except close events. """
# Read event.
if mask & Reactor.READ:
try:
self.__handler.recv()
except CORBA.SystemException:
self.handle_close()
# Write event.
elif mask & Reactor.WRITE:
try:
self.__handler.send(self.__outgoing[0])
except CORBA.SystemException:
self.handle_close()
# Exception event.
elif mask & Reactor.EXCEPTION:
self.handle_close()
return
def handle_close(self):
""" Callback method to handle close events. """
# Close down the worker.
self.__close()
return
def handle(self):
""" Return my underlying I/O handle.
In this case, my I/O handle is the file descriptor of my socket.
"""
return self.__connection.handle()
#########################################################################
# GIOPConnectionHandlerListener interface.
#########################################################################
def message_received(self, message):
""" Called when a complete GIOP message has been received. """
# Pass the message up to the GIOP server.
self.__giop_server.process_giop_message(message)
return
def message_sent(self):
""" Called when a complete GIOP message has been sent. """
# Remove the message from the outgoing queue.
del self.__outgoing[0]
# If there are no other messages left to send then tell the Reactor
# that I am no longer interested in write events.
if len(self.__outgoing) == 0:
self.__reactor.unregister_handler(self, Reactor.WRITE)
return
#########################################################################
# Private interface.
#########################################################################
def __close(self):
""" Close down the worker. """
if not self.__closed:
# Withdraw all of my Reactor registrations.
self.__reactor.unregister_handler(self, Reactor.ALL)
# Set the connection to blocking mode.
self.__connection.blocking(1)
# Close our connection.
self.__connection.disconnect()
# All done!
self.__closed = 1
# Remove circular references.
self.pseudo__del__()
return
#############################################################################