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<title>Class: Needle::Lifecycle::Singleton</title>
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<td><strong>Class</strong></td>
<td class="class-name-in-header">Needle::Lifecycle::Singleton</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../../files/lib/needle/lifecycle/singleton_rb.html">
lib/needle/lifecycle/singleton.rb
</a>
<br />
</td>
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<td><strong>Parent:</strong></td>
<td>
<a href="../Pipeline/Element.html">
Needle::Pipeline::Element
</a>
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<div id="description">
<p>
The instantiation pipeline element that enforces the singleton
multiplicity.
</p>
</div>
</div>
<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000028">call</a>
<a href="#M000027">initialize_element</a>
<a href="#M000029">reset!</a>
</div>
</div>
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<div id="methods">
<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000028" class="method-detail">
<a name="M000028"></a>
<div class="method-heading">
<a href="#M000028" class="method-signature">
<span class="method-name">call</span><span class="method-args">( container, point )</span>
</a>
</div>
<div class="method-description">
<p>
Returns the cached reference, if it has been previously cached. Otherwise,
invokes the next element in the pipeline and caches the result. The cached
reference is returned.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000028-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000028-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/lifecycle/singleton.rb, line 38</span>
38: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">call</span>( <span class="ruby-identifier">container</span>, <span class="ruby-identifier">point</span> )
39: <span class="ruby-keyword kw">unless</span> <span class="ruby-ivar">@is_cached</span>
40: <span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">synchronize</span> <span class="ruby-keyword kw">do</span>
41: <span class="ruby-keyword kw">unless</span> <span class="ruby-ivar">@is_cached</span>
42: <span class="ruby-ivar">@cached</span> = <span class="ruby-identifier">succ</span>.<span class="ruby-identifier">call</span>( <span class="ruby-identifier">container</span>, <span class="ruby-identifier">point</span> )
43: <span class="ruby-ivar">@is_cached</span> = <span class="ruby-keyword kw">true</span>
44: <span class="ruby-keyword kw">end</span>
45: <span class="ruby-keyword kw">end</span>
46: <span class="ruby-keyword kw">end</span>
47:
48: <span class="ruby-ivar">@cached</span>
49: <span class="ruby-keyword kw">end</span>
</pre>
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</div>
<div id="method-M000027" class="method-detail">
<a name="M000027"></a>
<div class="method-heading">
<a href="#M000027" class="method-signature">
<span class="method-name">initialize_element</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p>
Creates the mutex to use and sets the cached reference to <tt>nil</tt>.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000027-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000027-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/lifecycle/singleton.rb, line 29</span>
29: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize_element</span>
30: <span class="ruby-ivar">@mutex</span> = <span class="ruby-constant">QueryableMutex</span>.<span class="ruby-identifier">new</span>
31: <span class="ruby-ivar">@cached</span> = <span class="ruby-keyword kw">nil</span>
32: <span class="ruby-ivar">@is_cached</span> = <span class="ruby-keyword kw">false</span>
33: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000029" class="method-detail">
<a name="M000029"></a>
<div class="method-heading">
<a href="#M000029" class="method-signature">
<span class="method-name">reset!</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p>
Resets the cached singleton instance, so that the next time it is requested
it is re-constructed.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000029-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000029-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/lifecycle/singleton.rb, line 53</span>
53: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">reset!</span>
54: <span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">synchronize</span> <span class="ruby-keyword kw">do</span>
55: <span class="ruby-ivar">@cached</span> = <span class="ruby-keyword kw">nil</span>
56: <span class="ruby-ivar">@is_cached</span> = <span class="ruby-keyword kw">false</span>
57: <span class="ruby-keyword kw">end</span>
58: <span class="ruby-keyword kw">end</span>
</pre>
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