twisted.persisted.styles.Versioned : API documentation

This type of object is persisted with versioning information.

I have a single class attribute, the int persistenceVersion. After I am unserialized (and styles.doUpgrade() is called), self.upgradeToVersionX() will be called for each version upgrade I must undergo.

For example, if I serialize an instance of a Foo(Versioned) at version 4 and then unserialize it when the code is at version 9, the calls:

 self.upgradeToVersion5()
 self.upgradeToVersion6()
 self.upgradeToVersion7()
 self.upgradeToVersion8()
 self.upgradeToVersion9()

will be made. If any of these methods are undefined, a warning message will be printed.

def __setstate__(self, state): (source)

Undocumented

def __getstate__(self, dict=None): (source)

overridden in twisted.words.im.basesupport.AbstractAccount

Get state, adding a version number to it on its way out.

def versionUpgrade(self): (source)

(internal) Do a version upgrade.

Method	__setstate__	Undocumented
Method	__getstate__	Get state, adding a version number to it on its way out.
Method	versionUpgrade	(internal) Do a version upgrade.

twisted.persisted.styles.Versioned class documentation

`twisted.persisted.styles.Versioned` class documentation