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  • Committer: Bazaar Package Importer
  • Author(s): Matthias Klose
  • Date: 2004-06-21 22:01:11 UTC
  • mto: (2.2.3 sid)
  • mto: This revision was merged to the branch mainline in revision 3.
  • Revision ID: james.westby@ubuntu.com-20040621220111-vkf909euqnyrp3nr
Tags: upstream-1.3.0
Import upstream version 1.3.0

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twisted/spread/publish.py
 
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# Twisted, the Framework of Your Internet
 
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# Copyright (C) 2001 Matthew W. Lefkowitz
 
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# 
 
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# This library is free software; you can redistribute it and/or
 
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# modify it under the terms of version 2.1 of the GNU Lesser General Public
 
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# License as published by the Free Software Foundation.
 
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# 
 
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# This library is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 
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# Lesser General Public License for more details.
 
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# 
 
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# You should have received a copy of the GNU Lesser General Public
 
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# License along with this library; if not, write to the Free Software
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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"""
 
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Persistently cached objects for PB.
 
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Maintainer: U{Glyph Lefkowitz<mailto:glyph@twistedmatrix.com>}
 
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Stability: semi-stable
 
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Future Plans: None known.
 
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"""
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# Twisted imports
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from twisted.python import defer
 
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from twisted.internet import defer
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# sibling imports
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import jelly
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# System Imports
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import time
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import copy
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class Publishable(flavors.Cacheable):
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    """An object whose cached state persists across sessions.
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        try:
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            data = open(self.getFileName()).read()
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        except IOError:
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            print "** Didn't find the file."
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            recent = 0
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        else:
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            newself = jelly.unjelly(banana.decode(data))
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            print '** Found the file.'
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            recent = (newself.timestamp == self.timestamp)
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            print '** ', newself.timestamp, self.timestamp, recent
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        if recent:
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            self._cbGotUpdate(newself.__dict__)
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            self._wasCleanWhenLoaded = 1
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            self.remote.callRemote('getStateToPublish').addCallbacks(self._cbGotUpdate)
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    def __getstate__(self):
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        other = copy.copy(self.__dict__)
 
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        other = self.__dict__.copy()
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        # Remove PB-specific attributes
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        del other['broker']
 
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        del other['remote']
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        del other['luid']
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        # remove my own runtime-tracking stuff
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        del other['_activationListeners']
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    expects a RemotePublished as a result.  This will allow you to wait until
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    the result is really available.
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    Idiomatic usage would look like:
 
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    Idiomatic usage would look like::
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        publish.whenReady(serverObject.getMeAPublishable()).addCallback(lookAtThePublishable)
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    """
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    d2 = defer.Deferred()
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    d.addCallbacks(_pubReady, d2.armAndErrback,
 
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    d.addCallbacks(_pubReady, d2.errback,
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                   callbackArgs=(d2,))
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    return d2
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def _pubReady(result, d2):
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    '(internal)'
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    result.callWhenActivated(d2.armAndCallback)
 
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    result.callWhenActivated(d2.callback)