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<a href="twisted.html">Package twisted</a> ::
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<!-- =========== START OF CLASS DESCRIPTION =========== -->
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<h2 class="class">Class Controller</h2>
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<dl><dt><b>Known Subclasses:</b></dt>
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<a href="twisted.flow.protocol._Protocol.html"><code>_Protocol</code></a>,
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<a href="twisted.flow.controller.Block.html"><code>Block</code></a>,
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<a href="twisted.flow.controller.Deferred.html"><code>Deferred</code></a></dd></dl>
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<p>Flow controller</p>
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At the base of every flow, is a controller class which interprets the
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instructions, especially the CallLater instructions. This is primarly
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just a marker class to denote which classes consume Instruction events.
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If a controller cannot handle a particular instruction, it raises the
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Unsupported exception.
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