twisted.persisted.styles.Versioned.html [plain text]
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<a href="twisted.html">Package twisted</a> ::
<a href="twisted.persisted.html">Package persisted</a> ::
<a href="twisted.persisted.styles.html">Module styles</a> ::
Class Versioned
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<!-- =========== START OF CLASS DESCRIPTION =========== -->
<h2 class="class">Class Versioned</h2>
<dl><dt><b>Known Subclasses:</b></dt>
<dd>
<a href="twisted.im.basesupport.AbstractAccount.html"><code>AbstractAccount</code></a>,
<a href="twisted.words.webwords.AccountCreationWidget.html"><code>AccountCreationWidget</code></a>,
<a href="twisted.internet.app.Application.html"><code>Application</code></a>,
<a href="twisted.internet.app.ApplicationService.html"><code>ApplicationService</code></a>,
<a href="twisted.spread.pb.BrokerFactory.html"><code>BrokerFactory</code></a>,
<a href="twisted.python.components.Componentized.html"><code>Componentized</code></a>,
<a href="twisted.web.static.File.html"><code>File</code></a>,
<a href="twisted.words.service.Group.html"><code>Group</code></a>,
<a href="twisted.words.service.Participant.html"><code>Participant</code></a>,
<a href="twisted.words.webwords.ParticipantListWidget.html"><code>ParticipantListWidget</code></a>,
<a href="twisted.web.static.Registry.html"><code>Registry</code></a>,
<a href="twisted.names.hosts.Resolver.html"><code>Resolver</code></a>,
<a href="twisted.web.distrib.ResourcePublisher.html"><code>ResourcePublisher</code></a>,
<a href="twisted.words.service.Service.html"><code>Service</code></a>,
<a href="twisted.words.webwords.WebWordsAdminSite.html"><code>WebWordsAdminSite</code></a>,
<a href="twisted.words.webwords.WordsGadget.html"><code>WordsGadget</code></a></dd></dl>
<hr/>
<p>This type of object is persisted with versioning information.</p>
<p>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.</p>
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:
<pre class="literalblock">
self.upgradeToVersion5()
self.upgradeToVersion6()
self.upgradeToVersion7()
self.upgradeToVersion8()
self.upgradeToVersion9()
</pre>
will be made. If any of these methods are undefined, a warning message
will be printed.
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<th colspan="2">Method Summary</th></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>
<td><code><span class="summary-sig"><a href="twisted.persisted.styles.Versioned.html#__getstate__" class="summary-sig-name"><code>__getstate__</code></a>(<span class=summary-sig-arg>self</span>,
<span class=summary-sig-arg>dict</span>)</span></code>
<br />
Get state, adding a version number to it on its way out.</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>
<td><code><a name="__setstate__"></a><span class="summary-sig"><span class="summary-sig-name">__setstate__</span>(<span class=summary-sig-arg>self</span>,
<span class=summary-sig-arg>state</span>)</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"> </font></td>
<td><code><span class="summary-sig"><a href="twisted.persisted.styles.Versioned.html#versionUpgrade" class="summary-sig-name"><code>versionUpgrade</code></a>(<span class=summary-sig-arg>self</span>)</span></code>
<br />
(internal) Do a version upgrade.</td></tr>
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<!-- =========== START OF CLASS VARIABLE SUMMARY =========== -->
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<th colspan="2">Class Variable Summary</th></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"><code>tuple</code></font></td>
<td><b><a href="twisted.persisted.styles.Versioned.html#persistenceForgets"><code>persistenceForgets</code></a></b> = <span title="()"><code>() </code>
</span></td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"><code>int</code></font></td>
<td><b><a href="twisted.persisted.styles.Versioned.html#persistenceVersion"><code>persistenceVersion</code></a></b> = <span title="0">0 </span></td></tr>
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<a name="__getstate__"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
<h3><span class="sig"><span class="sig-name">__getstate__</span>(<span class=sig-arg>self</span>,
<span class=sig-arg>dict</span>=<span class=sig-default>None</span>)</span>
</h3>
Get state, adding a version number to it on its way out.
<dl><dt></dt><dd>
</dd></dl>
</td></tr></table>
<a name="versionUpgrade"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
<h3><span class="sig"><span class="sig-name">versionUpgrade</span>(<span class=sig-arg>self</span>)</span>
</h3>
(internal) Do a version upgrade.
<dl><dt></dt><dd>
</dd></dl>
</td></tr></table>
<br />
<!-- =========== START OF CLASS VARIABLE DETAILS =========== -->
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<th colspan="2">Class Variable Details</th></tr>
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<table width="100%" class="var-details" bgcolor="#e0e0e0"><tr><td>
<a name="persistenceForgets"></a>
<h3>persistenceForgets</h3>
<dl>
<dt></dt>
<dd>
<dl>
<dt><b>Type:</b></dt>
<dd>
<code>tuple</code>
</dd>
<span title="()"> <dt><b>Value:</b></dt>
<dd><table><tr><td>
<pre class="variable">
() </pre>
</td></tr></table></dd>
</span> </dl>
</dd>
</dl></td></tr></table>
<table width="100%" class="var-details" bgcolor="#e0e0e0"><tr><td>
<a name="persistenceVersion"></a>
<h3>persistenceVersion</h3>
<dl>
<dt></dt>
<dd>
<dl>
<dt><b>Type:</b></dt>
<dd>
<code>int</code>
</dd>
<span title="0"> <dt><b>Value:</b></dt>
<dd><table><tr><td>
<pre class="variable">
0 </pre>
</td></tr></table></dd>
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