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<title>Twisted Documentation: Historical Documents</title>

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<h1 class="title">Historical Documents</h1>

<div class="toc"><ol><li><a href="#auto0">2003</a></li><ul><li><a href="#auto1">Python Community Conference</a></li></ul><li><a href="#auto2">Previously</a></li></ol></div>

<span/>

<p>Here are documents which contain no pertinent information or documentation.

People from the Twisted team have published them, and they serve as interesting

land marks and thoughts. Please don't look here for documentation -- however,

if you are interested in the history of Twisted, or want to quote from these

documents, feel free. Remember, however -- the documents here may contain

wrong information -- they are not updated as Twisted is, to keep their

historical value intact.</p>

<h3>Python Community Conference<a name="auto1"/></h3>

<p>These papers were part of the <a href="http://python.org/pycon/" shape="rect">Python Community Conference</a> (PyCon) in March of 2003.</p>

<dl>

<dt><a href="2003/pycon/deferex.html" shape="rect"><cite>Generalization of Deferred Execution in Python</cite></a></dt>

<dd><p>A deceptively simple architectural challenge faced by many

multi-tasking applications is gracefully doing nothing. Systems that

must wait for the results of a long-running process, network message, or

database query while continuing to perform other tasks must establish

conventions for the semantics of waiting. The simplest of these is

blocking in a thread, but it has significant scalability problems. In

asynchronous frameworks, the most common approach is for long-running

methods to accept a callback that will be executed when the command

completes. These callbacks will have different signatures depending on

the nature of the data being requested, and often, a great deal of code

is necessary to glue one portion of an asynchronous networking system to

another. Matters become even more complicated when a developer wants to

wait for two different events to complete, requiring the developer to

"juggle" the callbacks and create a third, mutually incompatible

callback type to handle the final result.</p>

<p>This paper describes the mechanism used by the Twisted framework for

waiting for the results of long-running operations. This mechanism,

the <code>Deferred</code>, handles the often-neglected problems of

error handling, callback juggling, inter-system communication and code

readability.</p></dd>

<dt><a href="2003/pycon/applications/applications.html" shape="rect"><cite>Applications of the Twisted Framework</cite></a></dt>

<dd><p>Two projects developed using the Twisted framework are described;

one, Twisted.names, which is included as part of the Twisted

distribution, a domain name server and client API, and one, Pynfo, which

is packaged separately, a network information robot.</p></dd>

<dt><a href="2003/pycon/conch/conch.html" shape="rect"><cite>Twisted.Conch: SSH in Python with Twisted</cite></a></dt>

<dd><p>Conch is an implementation of the Secure Shell Protocol (currently

in the IETF standarization process). Secure Shell (or SSH) is a popular

protocol for remote shell access, file management and port forwarding

protected by military-grade security. SSH supports multiple encryption and

compression protocols for the wire transports, and a flexible system of

multiplexed channels on top. Conch uses the Twisted networking framework

to supply a library which can be used to implement both SSH clients and

servers. In addition, it also contains several ready made client programs,

including a drop-in replacement for the OpenSSH program from the OpenBSD

project.</p></dd>

<dt><a href="2003/pycon/lore/lore.html" shape="rect"><cite>The Lore Document Generation Framework</cite></a></dt>

<dd><p>Lore is a documentation generation system which uses a limited

subset of XHTML, together with some class attributes, as its source

format. This allows for lower barrier of entry than many other similar

systems, since HTML authoring tools are plentiful as is knowledge of

HTML writing. As an added advantage, the source format is viewable

directly, so that even if Lore is not available the documentation is

useful. It currently outputs LaTeX and HTML, which allows for most

use-cases.</p></dd>

<dt><a href="2003/pycon/pb/pb.html" shape="rect"><cite>Perspective Broker: <q>Translucent</q> Remote Method calls in Twisted</cite></a></dt>

<dd><p>One of the core services provided by the Twisted networking

framework is <q>Perspective Broker</q>, which provides a clean, secure,

easy-to-use Remote Procedure Call (RPC) mechanism. This paper explains the

novel features of PB, describes the security model and its implementation,

and provides brief examples of usage.</p></dd>

<dt><a href="2003/pycon/releasing/releasing.html" shape="rect"><cite>Managing the Release of a Large Python Project</cite></a></dt>

<dd><p>Twisted is a Python networking framework. At last count, the

project contains nearly 60,000 lines of effective code (not comments or

blank lines). When preparing a release, many details must be checked, and

many steps must be followed. We describe here the technologies and tools

we use, and explain how we built tools on top of them which help us make

releasing as painless as possible.</p></dd>

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<dt><a href="2003/pycon/twisted-reality/twisted-reality.html" shape="rect"><cite>Twisted Reality: A Flexible Framework for Virtual Worlds</cite></a></dt>

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<dd><p>Flexibly modelling virtual worlds in object-oriented languages has

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historically been difficult; the issues arising from multiple

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inheritance and order-of-execution resolution have limited the

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sophistication of existing object-oriented simulations. Twisted

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Reality avoids these problems by reifying both actions and

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relationships, and avoiding inheritance in favor of automated

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composition through adapters and interfaces.</p></dd>

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</dl>

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<h2>Previously<a name="auto2"/></h2>

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<ul>

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<li><a href="ipc10paper.html" shape="rect">The paper Glyph and Moshe presented in

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IPC10</a></li>

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<li><a href="ipc10errata.html" shape="rect">The errata published in IPC10 against the

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paper.</a></li>

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<li><a href="twisted-debian.html" shape="rect">A paper Moshe wrote about Twisted and

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Debian.</a></li>

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</ul>

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<p><a href="howto/index.html">Index</a></p>

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