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  <div class="section" id="taskflow">
<h1>TaskFlow<a class="headerlink" href="#taskflow" title="Permalink to this headline"></a></h1>
<p><em>TaskFlow is a Python library that helps to make task execution easy,
consistent and reliable.</em> <a class="footnote-reference" href="#f1" id="id1">[1]</a></p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If you are just getting started or looking for an overview please
visit: <a class="reference external" href="http://wiki.openstack.org/wiki/TaskFlow">http://wiki.openstack.org/wiki/TaskFlow</a> which provides better
introductory material, description of high level goals and related content.</p>
</div>
</div>
<div class="section" id="contents">
<h1>Contents<a class="headerlink" href="#contents" title="Permalink to this headline"></a></h1>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="atoms.html">Atoms, tasks and retries</a><ul>
<li class="toctree-l2"><a class="reference internal" href="atoms.html#atom">Atom</a></li>
<li class="toctree-l2"><a class="reference internal" href="atoms.html#task">Task</a></li>
<li class="toctree-l2"><a class="reference internal" href="atoms.html#retry">Retry</a></li>
<li class="toctree-l2"><a class="reference internal" href="atoms.html#module-taskflow.task">Interfaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="atoms.html#hierarchy">Hierarchy</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="arguments_and_results.html">Arguments and results</a><ul>
<li class="toctree-l2"><a class="reference internal" href="arguments_and_results.html#arguments-specification">Arguments specification</a></li>
<li class="toctree-l2"><a class="reference internal" href="arguments_and_results.html#results-specification">Results specification</a></li>
<li class="toctree-l2"><a class="reference internal" href="arguments_and_results.html#revert-arguments">Revert arguments</a></li>
<li class="toctree-l2"><a class="reference internal" href="arguments_and_results.html#retry-arguments">Retry arguments</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="inputs_and_outputs.html">Inputs and outputs</a><ul>
<li class="toctree-l2"><a class="reference internal" href="inputs_and_outputs.html#flow-inputs-and-outputs">Flow inputs and outputs</a></li>
<li class="toctree-l2"><a class="reference internal" href="inputs_and_outputs.html#engine-and-storage">Engine and storage</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="patterns.html">Patterns</a><ul>
<li class="toctree-l2"><a class="reference internal" href="patterns.html#module-taskflow.patterns.linear_flow">Linear flow</a></li>
<li class="toctree-l2"><a class="reference internal" href="patterns.html#module-taskflow.patterns.unordered_flow">Unordered flow</a></li>
<li class="toctree-l2"><a class="reference internal" href="patterns.html#module-taskflow.patterns.graph_flow">Graph flow</a></li>
<li class="toctree-l2"><a class="reference internal" href="patterns.html#hierarchy">Hierarchy</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="engines.html">Engines</a><ul>
<li class="toctree-l2"><a class="reference internal" href="engines.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#creating">Creating</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#usage">Usage</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#types">Types</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#how-they-run">How they run</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#special-cases">Special cases</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#scoping">Scoping</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#module-taskflow.engines.base">Interfaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#module-taskflow.engines.action_engine.engine">Implementations</a></li>
<li class="toctree-l2"><a class="reference internal" href="engines.html#hierarchy">Hierarchy</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="notifications.html">Notifications and listeners</a><ul>
<li class="toctree-l2"><a class="reference internal" href="notifications.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="notifications.html#receiving-notifications-with-callbacks">Receiving notifications with callbacks</a></li>
<li class="toctree-l2"><a class="reference internal" href="notifications.html#listeners">Listeners</a></li>
<li class="toctree-l2"><a class="reference internal" href="notifications.html#module-taskflow.listeners.base">Interfaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="notifications.html#implementations">Implementations</a></li>
<li class="toctree-l2"><a class="reference internal" href="notifications.html#hierarchy">Hierarchy</a></li>
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<li class="toctree-l1"><a class="reference internal" href="persistence.html">Persistence</a><ul>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#how-it-is-used">How it is used</a></li>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#usage">Usage</a></li>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#types">Types</a></li>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#module-taskflow.persistence.backends">Interfaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#module-taskflow.persistence.models">Models</a></li>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#implementations">Implementations</a></li>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#module-taskflow.storage">Storage</a></li>
<li class="toctree-l2"><a class="reference internal" href="persistence.html#hierarchy">Hierarchy</a></li>
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<li class="toctree-l1"><a class="reference internal" href="resumption.html">Resumption</a><ul>
<li class="toctree-l2"><a class="reference internal" href="resumption.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="resumption.html#factories">Factories</a></li>
<li class="toctree-l2"><a class="reference internal" href="resumption.html#names">Names</a></li>
<li class="toctree-l2"><a class="reference internal" href="resumption.html#scenarios">Scenarios</a></li>
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<li class="toctree-l1"><a class="reference internal" href="jobs.html">Jobs</a><ul>
<li class="toctree-l2"><a class="reference internal" href="jobs.html#overview">Overview</a></li>
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<li class="toctree-l2"><a class="reference internal" href="jobs.html#features">Features</a></li>
<li class="toctree-l2"><a class="reference internal" href="jobs.html#usage">Usage</a></li>
<li class="toctree-l2"><a class="reference internal" href="jobs.html#types">Types</a></li>
<li class="toctree-l2"><a class="reference internal" href="jobs.html#considerations">Considerations</a></li>
<li class="toctree-l2"><a class="reference internal" href="jobs.html#module-taskflow.jobs.base">Interfaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="jobs.html#implementations">Implementations</a></li>
<li class="toctree-l2"><a class="reference internal" href="jobs.html#hierarchy">Hierarchy</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="conductors.html">Conductors</a><ul>
<li class="toctree-l2"><a class="reference internal" href="conductors.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="conductors.html#considerations">Considerations</a></li>
<li class="toctree-l2"><a class="reference internal" href="conductors.html#module-taskflow.conductors.base">Interfaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="conductors.html#implementations">Implementations</a></li>
<li class="toctree-l2"><a class="reference internal" href="conductors.html#hierarchy">Hierarchy</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="section" id="supplementary">
<h1>Supplementary<a class="headerlink" href="#supplementary" title="Permalink to this headline"></a></h1>
<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<p>While developing TaskFlow the team has worked <em>hard</em> to make sure the various
concepts are explained by <em>relevant</em> examples. Here are a few selected examples
to get started (ordered by <em>perceived</em> complexity):</p>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="examples.html">Hello world</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#passing-values-from-and-to-tasks">Passing values from and to tasks</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#using-listeners">Using listeners</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#using-listeners-to-watch-a-phone-call">Using listeners (to watch a phone call)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#dumping-a-in-memory-backend">Dumping a in-memory backend</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#making-phone-calls">Making phone calls</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#making-phone-calls-automatically-reverting">Making phone calls (automatically reverting)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#building-a-car">Building a car</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#iterating-over-the-alphabet-using-processes">Iterating over the alphabet (using processes)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#watching-execution-timing">Watching execution timing</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#distance-calculator">Distance calculator</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#table-multiplier-in-parallel">Table multiplier (in parallel)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#linear-equation-solver-explicit-dependencies">Linear equation solver (explicit dependencies)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#linear-equation-solver-inferred-dependencies">Linear equation solver (inferred dependencies)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#linear-equation-solver-in-parallel">Linear equation solver (in parallel)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#creating-a-volume-in-parallel">Creating a volume (in parallel)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#summation-mapper-s-and-reducer-in-parallel">Summation mapper(s) and reducer (in parallel)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#sharing-a-thread-pool-executor-in-parallel">Sharing a thread pool executor (in parallel)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#storing-emitting-a-bill">Storing &amp; emitting a bill</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#suspending-a-workflow-resuming">Suspending a workflow &amp; resuming</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#creating-a-virtual-machine-resumable">Creating a virtual machine (resumable)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#creating-a-volume-resumable">Creating a volume (resumable)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#running-engines-via-iteration">Running engines via iteration</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#controlling-retries-using-a-retry-controller">Controlling retries using a retry controller</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#distributed-execution-simple">Distributed execution (simple)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#distributed-notification-simple">Distributed notification (simple)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#distributed-mandelbrot-complex">Distributed mandelbrot (complex)</a><ul>
<li class="toctree-l2"><a class="reference internal" href="examples.html#output">Output</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#code">Code</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#jobboard-producer-consumer-simple">Jobboard producer/consumer (simple)</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#conductor-simulating-a-ci-pipeline">Conductor simulating a CI pipeline</a></li>
<li class="toctree-l1"><a class="reference internal" href="examples.html#conductor-running-99-bottles-of-beer-song-requests">Conductor running 99 bottles of beer song requests</a></li>
</ul>
</div>
<p>To explore more of these examples please check out the <a class="reference external" href="http://git.openstack.org/cgit/openstack/taskflow/tree/taskflow/examples">examples</a> directory
in the TaskFlow <a class="reference external" href="http://git.openstack.org/cgit/openstack/taskflow/">source tree</a>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If the examples provided are not satisfactory (or up to your
standards) contributions are welcome and very much appreciated to help
improve them. The higher the quality and the clearer the examples are the
better and more useful they are for everyone.</p>
</div>
</div>
<div class="section" id="considerations">
<h2>Considerations<a class="headerlink" href="#considerations" title="Permalink to this headline"></a></h2>
<p>Things to consider before (and during) development and integration with
TaskFlow into your project:</p>
<ul class="simple">
<li>Read over the <a class="reference external" href="http://wiki.openstack.org/wiki/TaskFlow/Paradigm_shifts">paradigm shifts</a> and engage the team in <a class="reference external" href="irc://chat.freenode.net/openstack-state-management">IRC</a> (or via the
<a class="reference external" href="mailto:openstack-dev&#37;&#52;&#48;lists&#46;openstack&#46;org">openstack-dev</a> mailing list) if these need more explanation (prefix
<code class="docutils literal"><span class="pre">[Oslo][TaskFlow]</span></code> to your emails subject to get an even faster
response).</li>
<li>Follow (or at least attempt to follow) some of the established
<a class="reference external" href="http://wiki.openstack.org/wiki/TaskFlow/Best_practices">best practices</a> (feel free to add your own suggested best practices).</li>
<li>Keep in touch with the team (see above); we are all friendly and enjoy
knowing your use cases and learning how we can help make your lives easier
by adding or adjusting functionality in this library.</li>
</ul>
</div>
<div class="section" id="miscellaneous">
<h2>Miscellaneous<a class="headerlink" href="#miscellaneous" title="Permalink to this headline"></a></h2>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="exceptions.html">Exceptions</a></li>
<li class="toctree-l1"><a class="reference internal" href="states.html">States</a><ul>
<li class="toctree-l2"><a class="reference internal" href="states.html#engine">Engine</a></li>
<li class="toctree-l2"><a class="reference internal" href="states.html#flow">Flow</a></li>
<li class="toctree-l2"><a class="reference internal" href="states.html#task">Task</a></li>
<li class="toctree-l2"><a class="reference internal" href="states.html#retry">Retry</a></li>
<li class="toctree-l2"><a class="reference internal" href="states.html#jobs">Jobs</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="types.html">Types</a><ul>
<li class="toctree-l2"><a class="reference internal" href="types.html#module-taskflow.types.entity">Entity</a></li>
<li class="toctree-l2"><a class="reference internal" href="types.html#module-taskflow.types.failure">Failure</a></li>
<li class="toctree-l2"><a class="reference internal" href="types.html#module-taskflow.types.graph">Graph</a></li>
<li class="toctree-l2"><a class="reference internal" href="types.html#module-taskflow.types.notifier">Notifier</a></li>
<li class="toctree-l2"><a class="reference internal" href="types.html#module-taskflow.types.sets">Sets</a></li>
<li class="toctree-l2"><a class="reference internal" href="types.html#module-taskflow.types.timing">Timing</a></li>
<li class="toctree-l2"><a class="reference internal" href="types.html#module-taskflow.types.tree">Tree</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="utils.html">Utilities</a><ul>
<li class="toctree-l2"><a class="reference internal" href="utils.html#module-taskflow.utils.async_utils">Async</a></li>
<li class="toctree-l2"><a class="reference internal" href="utils.html#module-taskflow.utils.deprecation">Deprecation</a></li>
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