pylib
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caching


			
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  <div class="section" id="module-caching">
<span id="welcome-to-cachings-s-documentation"></span><h1>Welcome to cachings’s documentation!<a class="headerlink" href="#module-caching" title="Permalink to this headline">¶</a></h1>
<div class="section" id="caching-caching-module">
<h2>caching (Caching Module)<a class="headerlink" href="#caching-caching-module" title="Permalink to this headline">¶</a></h2>
<p><strong>Author:</strong></p>
<ul class="simple">
<li>Dirk Alders &lt;<a class="reference external" href="mailto:sudo-dirk&#37;&#52;&#48;mount-mockery&#46;de">sudo-dirk<span>&#64;</span>mount-mockery<span>&#46;</span>de</a>&gt;</li>
</ul>
<p><strong>Description:</strong></p>
<blockquote>
<div>This Module supports functions and classes for caching e.g. properties of other instances.</div></blockquote>
<p><strong>Submodules:</strong></p>
<ul class="simple">
<li><a class="reference internal" href="#caching.property_cache_json" title="caching.property_cache_json"><code class="xref py py-class docutils literal notranslate"><span class="pre">caching.property_cache_json</span></code></a></li>
<li><a class="reference internal" href="#caching.property_cache_pickle" title="caching.property_cache_pickle"><code class="xref py py-class docutils literal notranslate"><span class="pre">caching.property_cache_pickle</span></code></a></li>
</ul>
<p><strong>Unittest:</strong></p>
<blockquote>
<div>See also the <a class="reference download internal" download="" href="_downloads/f5f51665bfc67c10ccc039770b738067/unittest.pdf"><code class="xref download docutils literal notranslate"><span class="pre">unittest</span></code></a> documentation.</div></blockquote>
<dl class="class">
<dt id="caching.property_cache_json">
<em class="property">class </em><code class="descclassname">caching.</code><code class="descname">property_cache_json</code><span class="sig-paren">(</span><em>source_instance</em>, <em>cache_filename</em>, <em>load_all_on_init=False</em>, <em>callback_on_data_storage=None</em><span class="sig-paren">)</span><a class="headerlink" href="#caching.property_cache_json" title="Permalink to this definition">¶</a></dt>
<dd><p>Class to cache properties, which take longer on initialising than reading a file in json format. See also parent <a class="reference internal" href="#caching.property_cache_pickle" title="caching.property_cache_pickle"><code class="xref py py-class docutils literal notranslate"><span class="pre">property_cache_pickle</span></code></a></p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>source_instance</strong> (<em>instance</em>) – The source instance holding the data</li>
<li><strong>cache_filename</strong> (<em>str</em>) – File name, where the properties are stored as cache</li>
<li><strong>load_all_on_init</strong> – Optionally init behaviour control parameter. True will load all available properties from source on init, False not.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<ul class="last simple">
<li>This class uses json. You should <strong>only</strong> use keys of type string!</li>
<li>Unicode types are transfered to strings</li>
</ul>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>source_instance needs to have at least the following methods: uid(), keys(), data_version(), get()</p>
<ul class="last simple">
<li>uid(): returns the unique id of the source.</li>
<li>keys(): returns a list of all available keys.</li>
<li>data_version(): returns a version number of the current data (it should be increased, if the get method of the source instance returns improved values or the data structure had been changed).</li>
<li>get(key, default): returns the property for a key. If key does not exists, default will be returned.</li>
</ul>
</div>
<p>Reasons for updating the complete data set:</p>
<ul class="simple">
<li>UID of source_instance has changed (in comparison to the cached value).</li>
<li>data_version is increased</li>
</ul>
<p><strong>Example:</strong></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="ch">#!/usr/bin/env python</span>
<span class="c1"># -*- coding: UTF-8 -*-</span>

<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="n">sys</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s1">&#39;../..&#39;</span><span class="p">)</span>

<span class="kn">import</span> <span class="nn">caching</span>
<span class="kn">import</span> <span class="nn">report</span>


<span class="n">report</span><span class="o">.</span><span class="n">stdoutLoggingConfigure</span><span class="p">(</span><span class="n">log_name_lvl</span><span class="o">=</span><span class="p">[(</span><span class="s1">&#39;root&#39;</span><span class="p">,</span> <span class="s1">&#39;DEBUG&#39;</span><span class="p">),</span> <span class="p">])</span>


<span class="k">class</span> <span class="nc">test_slow_data</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="n">_ONE</span> <span class="o">=</span> <span class="s1">&#39;1&#39;</span>
    <span class="n">_TWO</span> <span class="o">=</span> <span class="s1">&#39;2&#39;</span>
    <span class="n">_THREE</span> <span class="o">=</span> <span class="s1">&#39;_property_cache_data_version_&#39;</span>
    <span class="n">_FOUR</span> <span class="o">=</span> <span class="s1">&#39;_property_cache_uid_&#39;</span>
    <span class="n">_FIVE</span> <span class="o">=</span> <span class="s1">&#39;__property_cache_uid_&#39;</span>
    <span class="n">KEYS</span> <span class="o">=</span> <span class="p">[</span><span class="n">_ONE</span><span class="p">,</span> <span class="n">_TWO</span><span class="p">,</span> <span class="n">_THREE</span><span class="p">,</span> <span class="n">_FOUR</span><span class="p">,</span> <span class="n">_FIVE</span><span class="p">]</span>
    <span class="n">VERS</span> <span class="o">=</span> <span class="mf">0.1</span>

    <span class="k">def</span> <span class="nf">data_version</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">VERS</span>

    <span class="k">def</span> <span class="nf">one</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_ONE</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">two</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_TWO</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">three</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_THREE</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">four</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_FOUR</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">five</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_FIVE</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="k">def</span> <span class="nf">print_n_sleep</span><span class="p">(</span><span class="n">k</span><span class="p">):</span>
            <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s1">&#39;slow get executed for </span><span class="si">%s</span><span class="se">\n</span><span class="s1">&#39;</span> <span class="o">%</span> <span class="n">k</span><span class="p">)</span>
            <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_ONE</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;one&#39;</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_TWO</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;two&#39;</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_THREE</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;three&#39;</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_FOUR</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;four&#39;</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_FIVE</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;five&#39;</span>
        <span class="k">return</span> <span class="n">default</span>

    <span class="k">def</span> <span class="nf">keys</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">KEYS</span>

    <span class="k">def</span> <span class="nf">uid</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="kc">None</span>


<span class="k">class</span> <span class="nc">tsd_cache_json</span><span class="p">(</span><span class="n">test_slow_data</span><span class="p">):</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="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="n">test_slow_data</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</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>
        <span class="bp">self</span><span class="o">.</span><span class="n">_cached_data</span> <span class="o">=</span> <span class="n">caching</span><span class="o">.</span><span class="n">property_cache_json</span><span class="p">(</span><span class="n">test_slow_data</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> <span class="s1">&#39;cache.json&#39;</span><span class="p">,</span> <span class="n">load_all_on_init</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">two</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">test_slow_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_TWO</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="p">)</span>


<span class="n">data</span> <span class="o">=</span> <span class="n">tsd_cache_json</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">&#39;Testing property_cache (json):</span><span class="se">\\</span><span class="s1">n--------------------------------&#39;</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">one</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">two</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">three</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">four</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">five</span><span class="p">())</span>
</pre></div>
</div>
<p>Will result on the first execution to the following output (with a long execution time):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">property_cache</span> <span class="p">(</span><span class="n">json</span><span class="p">):</span>\<span class="n">n</span><span class="o">--------------------------------</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">45</span><span class="p">,</span><span class="mi">282</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Cache</span> <span class="n">file</span> <span class="n">does</span> <span class="ow">not</span> <span class="n">exists</span> <span class="p">(</span><span class="n">yet</span><span class="p">)</span><span class="o">.</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">45</span><span class="p">,</span><span class="mi">283</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="mi">1</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">48</span><span class="p">,</span><span class="mi">285</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span> <span class="p">(</span><span class="s1">&#39;one&#39;</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">48</span><span class="p">,</span><span class="mi">286</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
<span class="n">one</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="mi">2</span>
<span class="n">two</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">_property_cache_data_version_</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">54</span><span class="p">,</span><span class="mi">292</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;_property_cache_data_version_&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span> <span class="p">(</span><span class="s1">&#39;three&#39;</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">54</span><span class="p">,</span><span class="mi">293</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
<span class="n">three</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">_property_cache_uid_</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">57</span><span class="p">,</span><span class="mi">297</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;_property_cache_uid_&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span> <span class="p">(</span><span class="s1">&#39;four&#39;</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">57</span><span class="p">,</span><span class="mi">297</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
<span class="n">four</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__property_cache_uid_</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">51</span><span class="p">:</span><span class="mi">00</span><span class="p">,</span><span class="mi">301</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;__property_cache_uid_&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span> <span class="p">(</span><span class="s1">&#39;five&#39;</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">51</span><span class="p">:</span><span class="mi">00</span><span class="p">,</span><span class="mi">301</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
<span class="n">five</span>
</pre></div>
</div>
<p>With every following execution (slow for getting “two” which is not cached - see implementation):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">property_cache</span> <span class="p">(</span><span class="n">json</span><span class="p">):</span>\<span class="n">n</span><span class="o">--------------------------------</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">51</span><span class="p">:</span><span class="mi">00</span><span class="p">,</span><span class="mi">380</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="n">properties</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">json</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">51</span><span class="p">:</span><span class="mi">00</span><span class="p">,</span><span class="mi">380</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="s1">&#39;one&#39;</span><span class="p">)</span>
<span class="n">one</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="mi">2</span>
<span class="n">two</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">51</span><span class="p">:</span><span class="mi">03</span><span class="p">,</span><span class="mi">381</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;_property_cache_data_version_&#39;</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="s1">&#39;three&#39;</span><span class="p">)</span>
<span class="n">three</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">51</span><span class="p">:</span><span class="mi">03</span><span class="p">,</span><span class="mi">381</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;_property_cache_uid_&#39;</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="s1">&#39;four&#39;</span><span class="p">)</span>
<span class="n">four</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">51</span><span class="p">:</span><span class="mi">03</span><span class="p">,</span><span class="mi">381</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">JsonCache</span><span class="p">:</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;__property_cache_uid_&#39;</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="s1">&#39;five&#39;</span><span class="p">)</span>
<span class="n">five</span>
</pre></div>
</div>
</dd></dl>

<dl class="class">
<dt id="caching.property_cache_pickle">
<em class="property">class </em><code class="descclassname">caching.</code><code class="descname">property_cache_pickle</code><span class="sig-paren">(</span><em>source_instance</em>, <em>cache_filename</em>, <em>load_all_on_init=False</em>, <em>callback_on_data_storage=None</em><span class="sig-paren">)</span><a class="headerlink" href="#caching.property_cache_pickle" title="Permalink to this definition">¶</a></dt>
<dd><p>Class to cache properties, which take longer on initialising than reading a file in pickle format.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>source_instance</strong> (<em>instance</em>) – The source instance holding the data</li>
<li><strong>cache_filename</strong> (<em>str</em>) – File name, where the properties are stored as cache</li>
<li><strong>load_all_on_init</strong> – Optionally init behaviour control parameter. True will load all available properties from source on init, False not.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>source_instance needs to have at least the following methods: uid(), keys(), data_version(), get()</p>
<ul class="last simple">
<li>uid(): returns the unique id of the source.</li>
<li>keys(): returns a list of all available keys.</li>
<li>data_version(): returns a version number of the current data (it should be increased, if the get method of the source instance returns improved values or the data structure had been changed).</li>
<li>get(key, default): returns the property for a key. If key does not exists, default will be returned.</li>
</ul>
</div>
<p>Reasons for updating the complete data set:</p>
<ul class="simple">
<li>UID of source_instance has changed (in comparison to the cached value).</li>
<li>data_version is increased</li>
</ul>
<p><strong>Example:</strong></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="ch">#!/usr/bin/env python</span>
<span class="c1"># -*- coding: UTF-8 -*-</span>

<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="n">sys</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s1">&#39;../..&#39;</span><span class="p">)</span>

<span class="kn">import</span> <span class="nn">caching</span>
<span class="kn">import</span> <span class="nn">report</span>


<span class="n">report</span><span class="o">.</span><span class="n">stdoutLoggingConfigure</span><span class="p">(</span><span class="n">log_name_lvl</span><span class="o">=</span><span class="p">[(</span><span class="s1">&#39;root&#39;</span><span class="p">,</span> <span class="s1">&#39;DEBUG&#39;</span><span class="p">),</span> <span class="p">])</span>


<span class="k">class</span> <span class="nc">test_slow_data</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="n">_ONE</span> <span class="o">=</span> <span class="s1">&#39;1&#39;</span>
    <span class="n">_TWO</span> <span class="o">=</span> <span class="s1">&#39;2&#39;</span>
    <span class="n">_THREE</span> <span class="o">=</span> <span class="s1">&#39;_property_cache_data_version_&#39;</span>
    <span class="n">_FOUR</span> <span class="o">=</span> <span class="s1">&#39;_property_cache_uid_&#39;</span>
    <span class="n">_FIVE</span> <span class="o">=</span> <span class="s1">&#39;__property_cache_uid_&#39;</span>
    <span class="n">KEYS</span> <span class="o">=</span> <span class="p">[</span><span class="n">_ONE</span><span class="p">,</span> <span class="n">_TWO</span><span class="p">,</span> <span class="n">_THREE</span><span class="p">,</span> <span class="n">_FOUR</span><span class="p">,</span> <span class="n">_FIVE</span><span class="p">]</span>
    <span class="n">VERS</span> <span class="o">=</span> <span class="mf">0.1</span>

    <span class="k">def</span> <span class="nf">data_version</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">VERS</span>

    <span class="k">def</span> <span class="nf">one</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_ONE</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">two</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_TWO</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">three</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_THREE</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">four</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_FOUR</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">five</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_FIVE</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="k">def</span> <span class="nf">print_n_sleep</span><span class="p">(</span><span class="n">k</span><span class="p">):</span>
            <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s1">&#39;slow get executed for </span><span class="si">%s</span><span class="se">\n</span><span class="s1">&#39;</span> <span class="o">%</span> <span class="n">k</span><span class="p">)</span>
            <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_ONE</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;one&#39;</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_TWO</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;two&#39;</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_THREE</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;three&#39;</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_FOUR</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;four&#39;</span>
        <span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_FIVE</span><span class="p">:</span>
            <span class="n">print_n_sleep</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="s1">&#39;five&#39;</span>
        <span class="k">return</span> <span class="n">default</span>

    <span class="k">def</span> <span class="nf">keys</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">KEYS</span>

    <span class="k">def</span> <span class="nf">uid</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="kc">None</span>


<span class="k">class</span> <span class="nc">tsd_cache_pickle</span><span class="p">(</span><span class="n">test_slow_data</span><span class="p">):</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="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="n">test_slow_data</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</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>
        <span class="bp">self</span><span class="o">.</span><span class="n">_cached_data</span> <span class="o">=</span> <span class="n">caching</span><span class="o">.</span><span class="n">property_cache_pickle</span><span class="p">(</span><span class="n">test_slow_data</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> <span class="s1">&#39;cache.pickle&#39;</span><span class="p">,</span> <span class="n">load_all_on_init</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">two</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">test_slow_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_TWO</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="p">)</span>


<span class="n">data</span> <span class="o">=</span> <span class="n">tsd_cache_pickle</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">&#39;Testing property_cache (pickle):</span><span class="se">\\</span><span class="s1">n--------------------------------&#39;</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">one</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">two</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">three</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">four</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">five</span><span class="p">())</span>
</pre></div>
</div>
<p>Will result on the first execution to the following output (with a long execution time):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">property_cache</span> <span class="p">(</span><span class="n">pickle</span><span class="p">):</span>\<span class="n">n</span><span class="o">--------------------------------</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">27</span><span class="p">,</span><span class="mi">103</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Cache</span> <span class="n">file</span> <span class="n">does</span> <span class="ow">not</span> <span class="n">exists</span> <span class="p">(</span><span class="n">yet</span><span class="p">)</span><span class="o">.</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">27</span><span class="p">,</span><span class="mi">103</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="mi">1</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">30</span><span class="p">,</span><span class="mi">107</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span> <span class="p">(</span><span class="s1">&#39;one&#39;</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">30</span><span class="p">,</span><span class="mi">107</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
<span class="n">one</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="mi">2</span>
<span class="n">two</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">_property_cache_data_version_</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">36</span><span class="p">,</span><span class="mi">112</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;_property_cache_data_version_&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span> <span class="p">(</span><span class="s1">&#39;three&#39;</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">36</span><span class="p">,</span><span class="mi">113</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
<span class="n">three</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">_property_cache_uid_</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">39</span><span class="p">,</span><span class="mi">116</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;_property_cache_uid_&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span> <span class="p">(</span><span class="s1">&#39;four&#39;</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">39</span><span class="p">,</span><span class="mi">117</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
<span class="n">four</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="n">__property_cache_uid_</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">120</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;__property_cache_uid_&#39;</span> <span class="kn">from</span> <span class="nn">source</span> <span class="n">instance</span> <span class="p">(</span><span class="s1">&#39;five&#39;</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">121</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">cache</span><span class="o">-</span><span class="n">file</span> <span class="n">stored</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
<span class="n">five</span>
</pre></div>
</div>
<p>With every following execution (slow for getting “two” which is not cached - see implementation):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">property_cache</span> <span class="p">(</span><span class="n">pickle</span><span class="p">):</span>\<span class="n">n</span><span class="o">--------------------------------</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">200</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Loading</span> <span class="n">properties</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="n">cache</span><span class="o">.</span><span class="n">pickle</span><span class="p">)</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">42</span><span class="p">,</span><span class="mi">200</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;1&#39;</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="s1">&#39;one&#39;</span><span class="p">)</span>
<span class="n">one</span>
<span class="n">slow</span> <span class="n">get</span> <span class="n">executed</span> <span class="k">for</span> <span class="mi">2</span>
<span class="n">two</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">45</span><span class="p">,</span><span class="mi">201</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;_property_cache_data_version_&#39;</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="s1">&#39;three&#39;</span><span class="p">)</span>
<span class="n">three</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">45</span><span class="p">,</span><span class="mi">201</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;_property_cache_uid_&#39;</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="s1">&#39;four&#39;</span><span class="p">)</span>
<span class="n">four</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">14</span> <span class="mi">00</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">45</span><span class="p">,</span><span class="mi">201</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">caching</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">PickCache</span><span class="p">:</span> <span class="n">Providing</span> <span class="nb">property</span> <span class="k">for</span> <span class="s1">&#39;__property_cache_uid_&#39;</span> <span class="kn">from</span> <span class="nn">cache</span> <span class="p">(</span><span class="s1">&#39;five&#39;</span><span class="p">)</span>
<span class="n">five</span>
</pre></div>
</div>
<dl class="method">
<dt id="caching.property_cache_pickle.get">
<code class="descname">get</code><span class="sig-paren">(</span><em>key</em>, <em>default=None</em><span class="sig-paren">)</span><a class="headerlink" href="#caching.property_cache_pickle.get" title="Permalink to this definition">¶</a></dt>
<dd><p>Method to get the cached property. If key does not exists in cache, the property will be loaded from source_instance and stored in cache (file).</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>key</strong> – key for value to get.</li>
<li><strong>default</strong> – value to be returned, if key does not exists.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">value for a given key or default value.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="caching.property_cache_pickle.keys">
<code class="descname">keys</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#caching.property_cache_pickle.keys" title="Permalink to this definition">¶</a></dt>
<dd><p>Method to get the available keys (from <code class="xref py py-data docutils literal notranslate"><span class="pre">source_instance</span></code>).</p>
</dd></dl>

</dd></dl>

</div>
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</div>
<div class="section" id="indices-and-tables">
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