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<h1>Source code for automaton.runners</h1><div class="highlight"><pre>
<span></span><span class="c1"># -*- coding: utf-8 -*-</span>
<span class="c1"># Copyright (C) 2015 Yahoo! Inc. All Rights Reserved.</span>
<span class="c1">#</span>
<span class="c1"># Licensed under the Apache License, Version 2.0 (the "License"); you may</span>
<span class="c1"># not use this file except in compliance with the License. You may obtain</span>
<span class="c1"># a copy of the License at</span>
<span class="c1">#</span>
<span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</span>
<span class="c1"># WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</span>
<span class="c1"># License for the specific language governing permissions and limitations</span>
<span class="c1"># under the License.</span>
<span class="kn">import</span> <span class="nn">abc</span>
<span class="kn">import</span> <span class="nn">six</span>
<span class="kn">from</span> <span class="nn">automaton</span> <span class="k">import</span> <span class="n">exceptions</span> <span class="k">as</span> <span class="n">excp</span>
<span class="kn">from</span> <span class="nn">automaton</span> <span class="k">import</span> <span class="n">machines</span>
<span class="n">_JUMPER_NOT_FOUND_TPL</span> <span class="o">=</span> <span class="p">(</span><span class="s2">"Unable to progress since no reaction (or"</span>
<span class="s2">" sent event) has been made available in"</span>
<span class="s2">" new state '</span><span class="si">%s</span><span class="s2">' (moved to from state '</span><span class="si">%s</span><span class="s2">'"</span>
<span class="s2">" in response to event '</span><span class="si">%s</span><span class="s2">')"</span><span class="p">)</span>
<span class="nd">@six</span><span class="o">.</span><span class="n">add_metaclass</span><span class="p">(</span><span class="n">abc</span><span class="o">.</span><span class="n">ABCMeta</span><span class="p">)</span>
<div class="viewcode-block" id="Runner"><a class="viewcode-back" href="../../api.html#automaton.runners.Runner">[docs]</a><span class="k">class</span> <span class="nc">Runner</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""Machine runner used to run a state machine.</span>
<span class="sd"> Only **one** runner per machine should be active at the same time (aka</span>
<span class="sd"> there should not be multiple runners using the same machine instance at</span>
<span class="sd"> the same time).</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">machine</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_machine</span> <span class="o">=</span> <span class="n">machine</span>
<span class="nd">@abc</span><span class="o">.</span><span class="n">abstractmethod</span>
<div class="viewcode-block" id="Runner.run"><a class="viewcode-back" href="../../api.html#automaton.runners.Runner.run">[docs]</a> <span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">,</span> <span class="n">initialize</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="sd">"""Runs the state machine, using reactions only."""</span></div>
<span class="nd">@abc</span><span class="o">.</span><span class="n">abstractmethod</span>
<div class="viewcode-block" id="Runner.run_iter"><a class="viewcode-back" href="../../api.html#automaton.runners.Runner.run_iter">[docs]</a> <span class="k">def</span> <span class="nf">run_iter</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">,</span> <span class="n">initialize</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="sd">"""Returns a iterator/generator that will run the state machine.</span>
<span class="sd"> NOTE(harlowja): only one runner iterator/generator should be active for</span>
<span class="sd"> a machine, if this is not observed then it is possible for</span>
<span class="sd"> initialization and other local state to be corrupted and cause issues</span>
<span class="sd"> when running...</span>
<span class="sd"> """</span></div></div>
<div class="viewcode-block" id="FiniteRunner"><a class="viewcode-back" href="../../api.html#automaton.runners.FiniteRunner">[docs]</a><span class="k">class</span> <span class="nc">FiniteRunner</span><span class="p">(</span><span class="n">Runner</span><span class="p">):</span>
<span class="sd">"""Finite machine runner used to run a finite machine.</span>
<span class="sd"> Only **one** runner per machine should be active at the same time (aka</span>
<span class="sd"> there should not be multiple runners using the same machine instance at</span>
<span class="sd"> the same time).</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">machine</span><span class="p">):</span>
<span class="sd">"""Create a runner for the given machine."""</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">machine</span><span class="p">,</span> <span class="p">(</span><span class="n">machines</span><span class="o">.</span><span class="n">FiniteMachine</span><span class="p">,)):</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s2">"FiniteRunner only works with FiniteMachine(s)"</span><span class="p">)</span>
<span class="nb">super</span><span class="p">(</span><span class="n">FiniteRunner</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="n">machine</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">,</span> <span class="n">initialize</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="k">for</span> <span class="n">transition</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">run_iter</span><span class="p">(</span><span class="n">event</span><span class="p">,</span> <span class="n">initialize</span><span class="o">=</span><span class="n">initialize</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">def</span> <span class="nf">run_iter</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">,</span> <span class="n">initialize</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="k">if</span> <span class="n">initialize</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_machine</span><span class="o">.</span><span class="n">initialize</span><span class="p">()</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">old_state</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_machine</span><span class="o">.</span><span class="n">current_state</span>
<span class="n">reaction</span><span class="p">,</span> <span class="n">terminal</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_machine</span><span class="o">.</span><span class="n">process_event</span><span class="p">(</span><span class="n">event</span><span class="p">)</span>
<span class="n">new_state</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_machine</span><span class="o">.</span><span class="n">current_state</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">sent_event</span> <span class="o">=</span> <span class="k">yield</span> <span class="p">(</span><span class="n">old_state</span><span class="p">,</span> <span class="n">new_state</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">GeneratorExit</span><span class="p">:</span>
<span class="k">break</span>
<span class="k">if</span> <span class="n">terminal</span><span class="p">:</span>
<span class="k">break</span>
<span class="k">if</span> <span class="n">reaction</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">sent_event</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">excp</span><span class="o">.</span><span class="n">NotFound</span><span class="p">(</span><span class="n">_JUMPER_NOT_FOUND_TPL</span> <span class="o">%</span> <span class="p">(</span><span class="n">new_state</span><span class="p">,</span>
<span class="n">old_state</span><span class="p">,</span>
<span class="n">event</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">sent_event</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">event</span> <span class="o">=</span> <span class="n">sent_event</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">cb</span><span class="p">,</span> <span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span> <span class="o">=</span> <span class="n">reaction</span>
<span class="n">event</span> <span class="o">=</span> <span class="n">cb</span><span class="p">(</span><span class="n">old_state</span><span class="p">,</span> <span class="n">new_state</span><span class="p">,</span> <span class="n">event</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
<div class="viewcode-block" id="HierarchicalRunner"><a class="viewcode-back" href="../../api.html#automaton.runners.HierarchicalRunner">[docs]</a><span class="k">class</span> <span class="nc">HierarchicalRunner</span><span class="p">(</span><span class="n">Runner</span><span class="p">):</span>
<span class="sd">"""Hierarchical machine runner used to run a hierarchical machine.</span>
<span class="sd"> Only **one** runner per machine should be active at the same time (aka</span>
<span class="sd"> there should not be multiple runners using the same machine instance at</span>
<span class="sd"> the same time).</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">machine</span><span class="p">):</span>
<span class="sd">"""Create a runner for the given machine."""</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">machine</span><span class="p">,</span> <span class="p">(</span><span class="n">machines</span><span class="o">.</span><span class="n">HierarchicalFiniteMachine</span><span class="p">,)):</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s2">"HierarchicalRunner only works with"</span>
<span class="s2">" HierarchicalFiniteMachine(s)"</span><span class="p">)</span>
<span class="nb">super</span><span class="p">(</span><span class="n">HierarchicalRunner</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="n">machine</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">,</span> <span class="n">initialize</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="k">for</span> <span class="n">transition</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">run_iter</span><span class="p">(</span><span class="n">event</span><span class="p">,</span> <span class="n">initialize</span><span class="o">=</span><span class="n">initialize</span><span class="p">):</span>
<span class="k">pass</span>
<span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">_process_event</span><span class="p">(</span><span class="n">machines</span><span class="p">,</span> <span class="n">event</span><span class="p">):</span>
<span class="sd">"""Matches a event to the machine hierarchy.</span>
<span class="sd"> If the lowest level machine does not handle the event, then the</span>
<span class="sd"> parent machine is referred to and so on, until there is only one</span>
<span class="sd"> machine left which *must* handle the event.</span>
<span class="sd"> The machine whose ``process_event`` does not throw invalid state or</span>
<span class="sd"> not found exceptions is expected to be the machine that should</span>
<span class="sd"> continue handling events...</span>
<span class="sd"> """</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">machine</span> <span class="o">=</span> <span class="n">machines</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="n">machine</span><span class="o">.</span><span class="n">process_event</span><span class="p">(</span><span class="n">event</span><span class="p">)</span>
<span class="k">except</span> <span class="p">(</span><span class="n">excp</span><span class="o">.</span><span class="n">InvalidState</span><span class="p">,</span> <span class="n">excp</span><span class="o">.</span><span class="n">NotFound</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">machines</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="k">raise</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">current</span> <span class="o">=</span> <span class="n">machine</span><span class="o">.</span><span class="n">_current</span>
<span class="k">if</span> <span class="n">current</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">current</span><span class="o">.</span><span class="n">on_exit</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">current</span><span class="o">.</span><span class="n">on_exit</span><span class="p">(</span><span class="n">current</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">event</span><span class="p">)</span>
<span class="n">machine</span><span class="o">.</span><span class="n">_current</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">machines</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">result</span>
<div class="viewcode-block" id="HierarchicalRunner.run_iter"><a class="viewcode-back" href="../../api.html#automaton.runners.HierarchicalRunner.run_iter">[docs]</a> <span class="k">def</span> <span class="nf">run_iter</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">,</span> <span class="n">initialize</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="sd">"""Returns a iterator/generator that will run the state machine.</span>
<span class="sd"> This will keep a stack (hierarchy) of machines active and jumps through</span>
<span class="sd"> them as needed (depending on which machine handles which event) during</span>
<span class="sd"> the running lifecycle.</span>
<span class="sd"> NOTE(harlowja): only one runner iterator/generator should be active for</span>
<span class="sd"> a machine hierarchy, if this is not observed then it is possible for</span>
<span class="sd"> initialization and other local state to be corrupted and causes issues</span>
<span class="sd"> when running...</span>
<span class="sd"> """</span>
<span class="n">machines</span> <span class="o">=</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">_machine</span><span class="p">]</span>
<span class="k">if</span> <span class="n">initialize</span><span class="p">:</span>
<span class="n">machines</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">initialize</span><span class="p">()</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">old_state</span> <span class="o">=</span> <span class="n">machines</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">current_state</span>
<span class="n">effect</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_process_event</span><span class="p">(</span><span class="n">machines</span><span class="p">,</span> <span class="n">event</span><span class="p">)</span>
<span class="n">new_state</span> <span class="o">=</span> <span class="n">machines</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">current_state</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">machine</span> <span class="o">=</span> <span class="n">effect</span><span class="o">.</span><span class="n">machine</span>
<span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">if</span> <span class="n">machine</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">machine</span> <span class="ow">is</span> <span class="ow">not</span> <span class="n">machines</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]:</span>
<span class="n">machine</span><span class="o">.</span><span class="n">initialize</span><span class="p">()</span>
<span class="n">machines</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">machine</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">sent_event</span> <span class="o">=</span> <span class="k">yield</span> <span class="p">(</span><span class="n">old_state</span><span class="p">,</span> <span class="n">new_state</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">GeneratorExit</span><span class="p">:</span>
<span class="k">break</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">machines</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">and</span> <span class="n">effect</span><span class="o">.</span><span class="n">terminal</span><span class="p">:</span>
<span class="c1"># Only allow the top level machine to actually terminate the</span>
<span class="c1"># execution, the rest of the nested machines must not handle</span>
<span class="c1"># events if they wish to have the root machine terminate...</span>
<span class="k">break</span>
<span class="k">if</span> <span class="n">effect</span><span class="o">.</span><span class="n">reaction</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">sent_event</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">excp</span><span class="o">.</span><span class="n">NotFound</span><span class="p">(</span><span class="n">_JUMPER_NOT_FOUND_TPL</span> <span class="o">%</span> <span class="p">(</span><span class="n">new_state</span><span class="p">,</span>
<span class="n">old_state</span><span class="p">,</span>
<span class="n">event</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">sent_event</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">event</span> <span class="o">=</span> <span class="n">sent_event</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">cb</span><span class="p">,</span> <span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span> <span class="o">=</span> <span class="n">effect</span><span class="o">.</span><span class="n">reaction</span>
<span class="n">event</span> <span class="o">=</span> <span class="n">cb</span><span class="p">(</span><span class="n">old_state</span><span class="p">,</span> <span class="n">new_state</span><span class="p">,</span> <span class="n">event</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div></div>
</pre></div>
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