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137 lines
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<a href="pypattyrn-module.html">Package pypattyrn</a> ::
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<a href="pypattyrn.creational-module.html">Package creational</a> ::
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Module singleton
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<h1 class="epydoc">Source Code for <a href="pypattyrn.creational.singleton-module.html">Module pypattyrn.creational.singleton</a></h1>
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<pre class="py-src">
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<a name="Singleton"></a><div id="Singleton-def"><a name="L1"></a><tt class="py-lineno"> 1</tt> <a class="py-toggle" href="#" id="Singleton-toggle" onclick="return toggle('Singleton');">-</a><tt class="py-line"><tt class="py-keyword">class</tt> <a class="py-def-name" href="pypattyrn.creational.singleton.Singleton-class.html">Singleton</a><tt class="py-op">(</tt><tt class="py-base-class">type</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Singleton-collapsed" style="display:none;" pad="++" indent="++++"></div><div id="Singleton-expanded"><a name="L2"></a><tt class="py-lineno"> 2</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L3"></a><tt class="py-lineno"> 3</tt> <tt class="py-line"><tt class="py-docstring"> Singleton Metaclass.</tt> </tt>
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<a name="L4"></a><tt class="py-lineno"> 4</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L5"></a><tt class="py-lineno"> 5</tt> <tt class="py-line"><tt class="py-docstring"> Enforces any object using this metaclass to only create a single instance.</tt> </tt>
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<a name="L6"></a><tt class="py-lineno"> 6</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L7"></a><tt class="py-lineno"> 7</tt> <tt class="py-line"><tt class="py-docstring"> - External Usage documentation: U{https://github.com/tylerlaberge/PyPatterns/wiki/Creational-Pattern-Usage}</tt> </tt>
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<a name="L8"></a><tt class="py-lineno"> 8</tt> <tt class="py-line"><tt class="py-docstring"> - External Singleton Pattern documentation: U{https://en.wikipedia.org/wiki/Singleton_pattern}</tt> </tt>
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<a name="L9"></a><tt class="py-lineno"> 9</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="L10"></a><tt class="py-lineno">10</tt> <tt class="py-line"> <tt id="link-0" class="py-name" targets="Variable pypattyrn.creational.singleton.Singleton.__instance=pypattyrn.creational.singleton.Singleton-class.html#__instance"><a title="pypattyrn.creational.singleton.Singleton.__instance" class="py-name" href="#" onclick="return doclink('link-0', '__instance', 'link-0');">__instance</a></tt> <tt class="py-op">=</tt> <tt class="py-name">None</tt> </tt>
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<a name="L11"></a><tt class="py-lineno">11</tt> <tt class="py-line"> </tt>
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<a name="Singleton.__call__"></a><div id="Singleton.__call__-def"><a name="L12"></a><tt class="py-lineno">12</tt> <a class="py-toggle" href="#" id="Singleton.__call__-toggle" onclick="return toggle('Singleton.__call__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="pypattyrn.creational.singleton.Singleton-class.html#__call__">__call__</a><tt class="py-op">(</tt><tt class="py-param">cls</tt><tt class="py-op">,</tt> <tt class="py-op">*</tt><tt class="py-param">args</tt><tt class="py-op">,</tt> <tt class="py-op">**</tt><tt class="py-param">kwargs</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Singleton.__call__-collapsed" style="display:none;" pad="++" indent="++++++++"></div><div id="Singleton.__call__-expanded"><a name="L13"></a><tt class="py-lineno">13</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L14"></a><tt class="py-lineno">14</tt> <tt class="py-line"><tt class="py-docstring"> Override the __call__ method to make sure only one instance is created.</tt> </tt>
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<a name="L15"></a><tt class="py-lineno">15</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="L16"></a><tt class="py-lineno">16</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt class="py-name">cls</tt><tt class="py-op">.</tt><tt id="link-1" class="py-name"><a title="pypattyrn.creational.singleton.Singleton.__instance" class="py-name" href="#" onclick="return doclink('link-1', '__instance', 'link-0');">__instance</a></tt> <tt class="py-keyword">is</tt> <tt class="py-name">None</tt><tt class="py-op">:</tt> </tt>
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<a name="L17"></a><tt class="py-lineno">17</tt> <tt class="py-line"> <tt class="py-name">cls</tt><tt class="py-op">.</tt><tt id="link-2" class="py-name"><a title="pypattyrn.creational.singleton.Singleton.__instance" class="py-name" href="#" onclick="return doclink('link-2', '__instance', 'link-0');">__instance</a></tt> <tt class="py-op">=</tt> <tt class="py-name">type</tt><tt class="py-op">.</tt><tt id="link-3" class="py-name" targets="Method pypattyrn.behavioral.null.Null.__call__()=pypattyrn.behavioral.null.Null-class.html#__call__,Method pypattyrn.creational.singleton.Singleton.__call__()=pypattyrn.creational.singleton.Singleton-class.html#__call__,Method pypattyrn.structural.decorator.CallWrapper.__call__()=pypattyrn.structural.decorator.CallWrapper-class.html#__call__,Method pypattyrn.structural.decorator.Decorator.__call__()=pypattyrn.structural.decorator.Decorator-class.html#__call__,Method pypattyrn.structural.decorator.DecoratorComplex.__call__()=pypattyrn.structural.decorator.DecoratorComplex-class.html#__call__,Method pypattyrn.structural.flyweight.FlyweightMeta.__call__()=pypattyrn.structural.flyweight.FlyweightMeta-class.html#__call__"><a title="pypattyrn.behavioral.null.Null.__call__
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pypattyrn.creational.singleton.Singleton.__call__
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pypattyrn.structural.decorator.CallWrapper.__call__
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pypattyrn.structural.decorator.Decorator.__call__
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pypattyrn.structural.decorator.DecoratorComplex.__call__
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pypattyrn.structural.flyweight.FlyweightMeta.__call__" class="py-name" href="#" onclick="return doclink('link-3', '__call__', 'link-3');">__call__</a></tt><tt class="py-op">(</tt><tt class="py-name">cls</tt><tt class="py-op">,</tt> <tt class="py-op">*</tt><tt class="py-name">args</tt><tt class="py-op">,</tt> <tt class="py-op">**</tt><tt class="py-name">kwargs</tt><tt class="py-op">)</tt> </tt>
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<a name="L18"></a><tt class="py-lineno">18</tt> <tt class="py-line"> </tt>
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<a name="L19"></a><tt class="py-lineno">19</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-name">cls</tt><tt class="py-op">.</tt><tt id="link-4" class="py-name"><a title="pypattyrn.creational.singleton.Singleton.__instance" class="py-name" href="#" onclick="return doclink('link-4', '__instance', 'link-0');">__instance</a></tt> </tt>
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</div></div><a name="L20"></a><tt class="py-lineno">20</tt> <tt class="py-line"> </tt><script type="text/javascript">
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