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# This file is part of Buildbot.  Buildbot is free software: you can 

# redistribute it and/or modify it under the terms of the GNU General Public 

# License as published by the Free Software Foundation, version 2. 

# 

# This program is distributed in the hope that it will be useful, but WITHOUT 

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 

# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more 

# details. 

# 

# You should have received a copy of the GNU General Public License along with 

# this program; if not, write to the Free Software Foundation, Inc., 51 

# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 

# 

# Copyright Buildbot Team Members 

 

from twisted.python import failure, log 

 

class SubscriptionPoint(object): 

    def __init__(self, name): 

        self.name = name 

        self.subscriptions = set() 

 

    def __str__(self): 

        return "<SubscriptionPoint '%s'>" % self.name 

 

    def subscribe(self, callback): 

        sub = Subscription(self, callback) 

        self.subscriptions.add(sub) 

        return sub 

 

    def deliver(self, *args, **kwargs): 

        for sub in list(self.subscriptions): 

            try: 

                sub.callback(*args, **kwargs) 

            except: 

                log.err(failure.Failure(), 

                        'while invoking callback %s to %s' % (sub.callback, self)) 

 

    def _unsubscribe(self, subscription): 

        self.subscriptions.remove(subscription) 

 

class Subscription(object): 

    def __init__(self, subpt, callback): 

        self.subpt = subpt 

        self.callback = callback 

 

    def unsubscribe(self): 

        self.subpt._unsubscribe(self)