def __init__(self, comp, delay):
# One of the rare cases where we do not call the parent class' init()
# right off the bat. Instead we first replicate the wrapped component's
# inboxes and outboxes. Private "_name" boxes are not replicated.
self.child = comp
for inbox in (item for item in self.child.Inboxes
if not item.startswith('_')):
try:
self.Inboxes[inbox] = self.child.Inboxes.get(inbox, "")
except AttributeError: # not a dict
self.Inboxes[inbox] = ""
for outbox in (item for item in self.child.Outboxes
if not item.startswith('_')):
try:
self.Outboxes[outbox] = self.child.Outboxes.get(outbox, "")
except AttributeError: # not a dict
self.Outboxes[outbox] = ""
super(TTL, self).__init__()
self.timebomb = SingleTick(delay=delay, check_interval=1)
# We can now create the mailbox linkages now that the parent class'
# init() has been called.
self.link((self.timebomb, 'outbox'), (self, '_trigger'))
self.link((self, '_disarm'), (self.timebomb, 'control'))
try:
self.link((self, '_sigkill'), (self.child, 'control'))
self.nochildcontrol = False
except KeyError:
self.nochildcontrol = True
for inbox in (item for item in self.child.Inboxes
if not item.startswith('_')):
self.link((self, inbox), (self.child, inbox), passthrough=1)
for outbox in (item for item in self.child.Outboxes
if not item.startswith('_')):
self.link((self.child, outbox), (self, outbox), passthrough=2)
self.addChildren(self.child)
def __init__(self, comp, delay):
# One of the rare cases where we do not call the parent class' init()
# right off the bat. Instead we first replicate the wrapped component's
# inboxes and outboxes. Private "_name" boxes are not replicated.
self.child = comp
for inbox in (item for item in self.child.Inboxes if not item.startswith('_')):
try:
self.Inboxes[inbox] = self.child.Inboxes.get(inbox, "")
except AttributeError: # not a dict
self.Inboxes[inbox] = ""
for outbox in (item for item in self.child.Outboxes if not item.startswith('_')):
try:
self.Outboxes[outbox] = self.child.Outboxes.get(outbox, "")
except AttributeError: # not a dict
self.Outboxes[outbox] = ""
super(TTL, self).__init__()
self.timebomb = SingleTick(delay=delay, check_interval=1)
# We can now create the mailbox linkages now that the parent class'
# init() has been called.
self.link((self.timebomb, 'outbox'), (self, '_trigger'))
self.link((self, '_disarm'), (self.timebomb, 'control'))
try:
self.link((self, '_sigkill'), (self.child, 'control'))
self.nochildcontrol = False
except KeyError:
self.nochildcontrol = True
for inbox in (item for item in self.child.Inboxes if not item.startswith('_')):
self.link((self, inbox), (self.child, inbox), passthrough=1)
for outbox in (item for item in self.child.Outboxes if not item.startswith('_')):
self.link((self.child, outbox), (self, outbox), passthrough=2)
self.addChildren(self.child)
# -*- coding: utf-8 -*-
# Copyright 2010 British Broadcasting Corporation and Kamaelia Contributors(1)
#
# (1) Kamaelia Contributors are listed in the AUTHORS file and at
# http://www.kamaelia.org/AUTHORS - please extend this file,
# not this notice.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
'''
This file contains an example usage of Kamaelia.Apps.SA.Time.SingleTick
'''
from Kamaelia.Chassis.Pipeline import Pipeline
from Kamaelia.Util.Console import ConsoleEchoer
from Kamaelia.Apps.SA.Time import SingleTick
Pipeline(
SingleTick(0.3),
ConsoleEchoer(use_repr=True),
).run()
class TTL(Axon.Component.component):
'''
This "Time To Live" component is designed to wrap another existing component.
The TTL starts an embedded SingleTick component which waits for "delay"
seconds and then the TTL progressivly becomes more aggressive in its attempts
to shutdown the wrapped component. Ideally this component should not be
needed, but it is handy for components that do not have their own timeout
functionality.
TTL(comp, delay)
'''
Inboxes = {'_trigger':'Receives True message to cause embedded component to shutdown'}
Outboxes= {'_sigkill':'Dynamically links to a emedded component control',
'_disarm':'Stop timebomb early'}
def __init__(self, comp, delay):
# One of the rare cases where we do not call the parent class' init()
# right off the bat. Instead we first replicate the wrapped component's
# inboxes and outboxes. Private "_name" boxes are not replicated.
self.child = comp
for inbox in (item for item in self.child.Inboxes if not item.startswith('_')):
try:
self.Inboxes[inbox] = self.child.Inboxes.get(inbox, "")
except AttributeError: # not a dict
self.Inboxes[inbox] = ""
for outbox in (item for item in self.child.Outboxes if not item.startswith('_')):
try:
self.Outboxes[outbox] = self.child.Outboxes.get(outbox, "")
except AttributeError: # not a dict
self.Outboxes[outbox] = ""
super(TTL, self).__init__()
self.timebomb = SingleTick(delay=delay, check_interval=1)
# We can now create the mailbox linkages now that the parent class'
# init() has been called.
self.link((self.timebomb, 'outbox'), (self, '_trigger'))
self.link((self, '_disarm'), (self.timebomb, 'control'))
try:
self.link((self, '_sigkill'), (self.child, 'control'))
self.nochildcontrol = False
except KeyError:
self.nochildcontrol = True
for inbox in (item for item in self.child.Inboxes if not item.startswith('_')):
self.link((self, inbox), (self.child, inbox), passthrough=1)
for outbox in (item for item in self.child.Outboxes if not item.startswith('_')):
self.link((self.child, outbox), (self, outbox), passthrough=2)
self.addChildren(self.child)
# FIXME: Really a fixme for Axon, but it strikes me (MPS) that what a
# FIXME: huge chunk of this code is crying out for really is a way of
# FIXME: killing components. Until that happens, this is pretty good,
# FIXME: but we can go a stage further here and add in sabotaging the
# FIXME: components methods as well to force it to crash if all else
# FIXME: fails (!) (akin to using ctypes to force a stack trace in
# FIXME: python(!))
def main(self):
self.timebomb.activate()
self.child.activate()
yield 1
while not (self.child._isStopped() or (self.dataReady('_trigger') and self.recv('_trigger') is True)):
self.pause()
yield 1
if not self.timebomb._isStopped():
self.send(producerFinished(), '_disarm')
shutdown_messages = [ producerFinished(), shutdownMicroprocess(), serverShutdown(), shutdown() ]
for msg in shutdown_messages:
if not self.child._isStopped():
self.send( msg, "_sigkill")
yield 1
yield 1
else:
break
self.removeChild(self.child)
yield 1
if not self.child._isStopped():
self.child.stop()
yield 1
if 'signal' in self.Outboxes:
self.send(shutdownMicroprocess(), 'signal')
yield 1
