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<title>Module: Needle::InterceptorChainBuilder</title>
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<td><strong>Module</strong></td>
<td class="class-name-in-header">Needle::InterceptorChainBuilder</td>
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<td><strong>In:</strong></td>
<td>
<a href="../../files/lib/needle/interceptor-chain_rb.html">
lib/needle/interceptor-chain.rb
</a>
<br />
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<p>
This module encapsulates the functionality for building interceptor chains.
</p>
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<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000017">build</a>
</div>
</div>
</div>
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<div id="section">
<div id="class-list">
<h3 class="section-bar">Classes and Modules</h3>
Class <a href="InterceptorChainBuilder/InterceptedServiceProxy.html" class="link">Needle::InterceptorChainBuilder::InterceptedServiceProxy</a><br />
Class <a href="InterceptorChainBuilder/InterceptorChainElement.html" class="link">Needle::InterceptorChainBuilder::InterceptorChainElement</a><br />
Class <a href="InterceptorChainBuilder/ProxyObjectChainElement.html" class="link">Needle::InterceptorChainBuilder::ProxyObjectChainElement</a><br />
</div>
<div id="constants-list">
<h3 class="section-bar">Constants</h3>
<div class="name-list">
<table summary="Constants">
<tr class="top-aligned-row context-row">
<td class="context-item-name">InvocationContext</td>
<td>=</td>
<td class="context-item-value">Struct.new( :sym, :args, :block, :data )</td>
<td width="3em"> </td>
<td class="context-item-desc">
The context of a method invocation. This is used in an interceptor chain to
encapsulate the elements of the current invocation. sym: the name of the
method being invoked args: the argument list being passed to the method
block: the reference to the block attached to the method invocation data: a
hash that may be used by clients for storing arbitrary data in
<pre>
the context.
</pre>
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<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000017" class="method-detail">
<a name="M000017"></a>
<div class="method-heading">
<a href="#M000017" class="method-signature">
<span class="method-name">build</span><span class="method-args">( point, service, interceptors )</span>
</a>
</div>
<div class="method-description">
<p>
This will apply the given interceptors to the given service by first
ordering the interceptors based on their relative priorities, and then
dynamically modifying the service’s methods so that the chain of
interceptors sits in front of each of them.
</p>
<p>
The modified service is returned.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000017-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000017-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/interceptor-chain.rb, line 103</span>
103: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">build</span>( <span class="ruby-identifier">point</span>, <span class="ruby-identifier">service</span>, <span class="ruby-identifier">interceptors</span> )
104: <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">service</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">interceptors</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">interceptors</span>.<span class="ruby-identifier">empty?</span>
105:
106: <span class="ruby-identifier">ordered_list</span> =
107: <span class="ruby-identifier">interceptors</span>.<span class="ruby-identifier">sort</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">a</span>,<span class="ruby-identifier">b</span><span class="ruby-operator">|</span>
108: <span class="ruby-identifier">a</span>.<span class="ruby-identifier">options</span>[<span class="ruby-identifier">:priority</span>] <span class="ruby-operator"><=></span> <span class="ruby-identifier">b</span>.<span class="ruby-identifier">options</span>[<span class="ruby-identifier">:priority</span>] }
109:
110: <span class="ruby-identifier">chain</span> = <span class="ruby-constant">ProxyObjectChainElement</span>.<span class="ruby-identifier">new</span>( <span class="ruby-identifier">service</span> )
111:
112: <span class="ruby-identifier">ordered_list</span>.<span class="ruby-identifier">reverse</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">interceptor</span><span class="ruby-operator">|</span>
113: <span class="ruby-identifier">factory</span> = <span class="ruby-identifier">interceptor</span>.<span class="ruby-identifier">action</span>.<span class="ruby-identifier">call</span>( <span class="ruby-identifier">point</span>.<span class="ruby-identifier">container</span> )
114: <span class="ruby-identifier">instance</span> = <span class="ruby-identifier">factory</span>.<span class="ruby-identifier">new</span>( <span class="ruby-identifier">point</span>, <span class="ruby-identifier">interceptor</span>.<span class="ruby-identifier">options</span> )
115: <span class="ruby-identifier">element</span> = <span class="ruby-constant">InterceptorChainElement</span>.<span class="ruby-identifier">new</span>( <span class="ruby-identifier">instance</span> )
116: <span class="ruby-identifier">element</span>.<span class="ruby-identifier">next</span> = <span class="ruby-identifier">chain</span>
117: <span class="ruby-identifier">chain</span> = <span class="ruby-identifier">element</span>
118: <span class="ruby-keyword kw">end</span>
119:
120: <span class="ruby-comment cmt"># FIXME: should inherited methods of "Object" be interceptable?</span>
121: <span class="ruby-identifier">methods_to_intercept</span> = ( <span class="ruby-identifier">service</span>.<span class="ruby-identifier">class</span>.<span class="ruby-identifier">instance_methods</span>( <span class="ruby-keyword kw">true</span> ) <span class="ruby-operator">-</span>
122: <span class="ruby-constant">Object</span>.<span class="ruby-identifier">instance_methods</span> <span class="ruby-operator">+</span>
123: <span class="ruby-identifier">service</span>.<span class="ruby-identifier">class</span>.<span class="ruby-identifier">instance_methods</span>( <span class="ruby-keyword kw">false</span> ) ).<span class="ruby-identifier">uniq</span>
124:
125: <span class="ruby-identifier">service</span> = <span class="ruby-constant">InterceptedServiceProxy</span>.<span class="ruby-identifier">new</span>( <span class="ruby-identifier">chain</span> )
126: <span class="ruby-identifier">singleton</span> = <span class="ruby-keyword kw">class</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">service</span>; <span class="ruby-keyword kw">self</span>; <span class="ruby-keyword kw">end</span>
127:
128: <span class="ruby-identifier">methods_to_intercept</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">method</span><span class="ruby-operator">|</span>
129: <span class="ruby-keyword kw">next</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">method</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/^__/</span>
130:
131: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">singleton</span>.<span class="ruby-identifier">instance_methods</span>(<span class="ruby-keyword kw">false</span>).<span class="ruby-identifier">include?</span> <span class="ruby-identifier">method</span>
132: <span class="ruby-identifier">singleton</span>.<span class="ruby-identifier">send</span>( <span class="ruby-identifier">:remove_method</span>, <span class="ruby-identifier">method</span> )
133: <span class="ruby-keyword kw">end</span>
134:
135: <span class="ruby-identifier">singleton</span>.<span class="ruby-identifier">class_eval</span> <span class="ruby-value str">"def \#{method}( *args, &block )\ncontext = InvocationContext.new( :\#{method}, args, block, Hash.new )\n@chain.process_next( context )\nend\n"</span>
136: <span class="ruby-keyword kw">end</span>
137:
138: <span class="ruby-comment cmt"># allow the interceptor to intercept methods not explicitly</span>
139: <span class="ruby-comment cmt"># declared on the reciever.</span>
140: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">singleton</span>.<span class="ruby-identifier">instance_methods</span>(<span class="ruby-keyword kw">false</span>).<span class="ruby-identifier">include?</span> <span class="ruby-value str">"method_missing"</span>
141: <span class="ruby-identifier">singleton</span>.<span class="ruby-identifier">send</span>( <span class="ruby-identifier">:remove_method</span>, <span class="ruby-identifier">:method_missing</span> )
142: <span class="ruby-keyword kw">end</span>
143:
144: <span class="ruby-identifier">singleton</span>.<span class="ruby-identifier">class_eval</span> <span class="ruby-value str">"def method_missing( sym, *args, &block )\ncontext = InvocationContext.new( sym, args, block, Hash.new )\n@chain.process_next( context )\nend\n"</span>
145:
146: <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">service</span>
147: <span class="ruby-keyword kw">end</span>
</pre>
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