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<title>Class: Needle::Lifecycle::Proxy</title>
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<td><strong>Class</strong></td>
<td class="class-name-in-header">Needle::Lifecycle::Proxy</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../../files/lib/needle/lifecycle/proxy_rb.html">
lib/needle/lifecycle/proxy.rb
</a>
<br />
</td>
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<td><strong>Parent:</strong></td>
<td>
Object
</td>
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<div id="description">
<p>
A proxy class to aid in deferred instantiation of service points. This is
used primarily by the "deferred" service models.
</p>
</div>
</div>
<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000026">inspect</a>
<a href="#M000025">method_missing</a>
<a href="#M000024">new</a>
</div>
</div>
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<h3 class="section-bar">Public Class methods</h3>
<div id="method-M000024" class="method-detail">
<a name="M000024"></a>
<div class="method-heading">
<a href="#M000024" class="method-signature">
<span class="method-name">new</span><span class="method-args">( proc_obj=nil, *args, &callback )</span>
</a>
</div>
<div class="method-description">
<p>
Create a new proxy object that wraps the object returned by either the
<tt>proc_obj</tt> or <tt>callback</tt>. (Only one of <tt>proc_obj</tt> or
<tt>callback</tt> should be specified.)
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000024-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000024-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/lifecycle/proxy.rb, line 29</span>
29: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>( <span class="ruby-identifier">proc_obj</span>=<span class="ruby-keyword kw">nil</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">args</span>, <span class="ruby-operator">&</span><span class="ruby-identifier">callback</span> )
30: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">proc_obj</span> <span class="ruby-operator">&&</span> <span class="ruby-identifier">callback</span>
31: <span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-value str">"only specify argument OR block, not both"</span>
32: <span class="ruby-keyword kw">end</span>
33:
34: <span class="ruby-ivar">@callback</span> = <span class="ruby-identifier">proc_obj</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">callback</span> <span class="ruby-keyword kw">or</span>
35: <span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-value str">"callback required"</span>
36:
37: <span class="ruby-ivar">@args</span> = <span class="ruby-identifier">args</span>
38: <span class="ruby-ivar">@mutex</span> = <span class="ruby-constant">QueryableMutex</span>.<span class="ruby-identifier">new</span>
39: <span class="ruby-ivar">@instantiation_failed</span> = <span class="ruby-keyword kw">false</span>
40: <span class="ruby-ivar">@instance</span> = <span class="ruby-keyword kw">nil</span>
41: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000026" class="method-detail">
<a name="M000026"></a>
<div class="method-heading">
<a href="#M000026" class="method-signature">
<span class="method-name">inspect</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000026-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000026-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/lifecycle/proxy.rb, line 85</span>
85: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">inspect</span>
86: <span class="ruby-node">"#<#{self.class.name}:#{"0x%08x"%self.object_id}:"</span> <span class="ruby-operator">+</span>
87: <span class="ruby-node">"instantiated=>#{@instance ? true : false}>"</span>
88: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000025" class="method-detail">
<a name="M000025"></a>
<div class="method-heading">
<a href="#M000025" class="method-signature">
<span class="method-name">method_missing</span><span class="method-args">( sym, *args, &block )</span>
</a>
</div>
<div class="method-description">
<p>
Attempts to invoke the given message on the service. If the service has not
yet been instantiated, it will be instantiated and stored.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000025-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000025-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/lifecycle/proxy.rb, line 45</span>
45: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">method_missing</span>( <span class="ruby-identifier">sym</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">args</span>, <span class="ruby-operator">&</span><span class="ruby-identifier">block</span> )
46: <span class="ruby-keyword kw">unless</span> <span class="ruby-ivar">@instance</span> <span class="ruby-operator">||</span> <span class="ruby-ivar">@instantiation_failed</span>
47: <span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">synchronize</span> <span class="ruby-keyword kw">do</span>
48: <span class="ruby-keyword kw">unless</span> <span class="ruby-ivar">@instance</span> <span class="ruby-operator">||</span> <span class="ruby-ivar">@instantiation_failed</span>
49: <span class="ruby-keyword kw">begin</span>
50: <span class="ruby-ivar">@instance</span> = <span class="ruby-ivar">@callback</span>.<span class="ruby-identifier">call</span>( <span class="ruby-operator">*</span><span class="ruby-ivar">@args</span> )
51: <span class="ruby-keyword kw">rescue</span> <span class="ruby-constant">Exception</span>
52: <span class="ruby-ivar">@instantiation_failed</span> = <span class="ruby-keyword kw">true</span>
53: <span class="ruby-identifier">raise</span>
54: <span class="ruby-keyword kw">end</span>
55: <span class="ruby-keyword kw">end</span>
56: <span class="ruby-keyword kw">end</span>
57: <span class="ruby-keyword kw">end</span>
58:
59: <span class="ruby-keyword kw">unless</span> <span class="ruby-ivar">@instantiation_failed</span>
60: <span class="ruby-ivar">@instance</span>.<span class="ruby-identifier">__send__</span> <span class="ruby-identifier">sym</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">args</span>, <span class="ruby-operator">&</span><span class="ruby-identifier">block</span>
61: <span class="ruby-keyword kw">else</span>
62: <span class="ruby-comment cmt"># just return nil... this way, a failed instantiation won't barf</span>
63: <span class="ruby-comment cmt"># more than once... I hope...</span>
64: <span class="ruby-keyword kw">end</span>
65: <span class="ruby-keyword kw">end</span>
</pre>
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