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<h1 class="post-title-main">More about Spoon Processors</h1>
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<p>A program analysis is a combination of query and analysis code.
In Spoon, this conceptual pair is reified in a <code class="language-plaintext highlighter-rouge">processor</code>.
A Spoon processor is a class that focuses on the analysis of one
kind of program elements. For instance, the processor at the end of
this page presents a processor that analyzes a program to find
empty catch blocks.</p>
<p>The elements to be analyzed (here catch blocks), are given by generic typing:
the programmer declares the AST node type under analysis as class generics.
The processed element type is automatically inferred through runtime introspection
of the processor class. There is also an optional overridable method for querying
elements at a finer grain.</p>
<p>The process method takes the requested element as input and does the analysis
(here detecting empty catch blocks). At any time, you can interrupt the processing
of the model with a call to <code class="language-plaintext highlighter-rouge">interrupt()</code> (this stops all processors, and proceeds
with the next step which is usually pretty-printing the code to disk).</p>
<p>Since a real world analysis combines multiple queries, multiple processors can
be used at the same time. The launcher applies them in the order they have been declared.</p>
<p>Processors are implemented with a visitor design pattern applied to the Spoon
Java model. Each node of the metamodel implements an <code class="language-plaintext highlighter-rouge">accept</code> method so that it
can be visited by a visitor object, which can perform any kind of action,
including modification.</p>
<div class="alert alert-success" role="alert"><i class="fa fa-check-square-o"></i> <b>Tip: </b>
Spoon provides developers with an intuitive Java metamodel and concise abstractions
to query and process AST elements.
</div>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">package</span> <span class="nn">fr.inria.gforge.spoon.processors</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">spoon.support.Level</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">spoon.processing.AbstractProcessor</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">spoon.reflect.code.CtCatch</span><span class="o">;</span>
<span class="cm">/**
* Reports warnings when empty catch blocks are found.
*/</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">CatchProcessor</span> <span class="kd">extends</span> <span class="nc">AbstractProcessor</span><span class="o"><</span><span class="nc">CtCatch</span><span class="o">></span> <span class="o">{</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">process</span><span class="o">(</span><span class="nc">CtCatch</span> <span class="n">element</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="n">element</span><span class="o">.</span><span class="na">getBody</span><span class="o">().</span><span class="na">getStatements</span><span class="o">().</span><span class="na">size</span><span class="o">()</span> <span class="o">==</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span>
<span class="n">getFactory</span><span class="o">().</span><span class="na">getEnvironment</span><span class="o">().</span><span class="na">report</span><span class="o">(</span><span class="k">this</span><span class="o">,</span> <span class="nc">Level</span><span class="o">.</span><span class="na">WARN</span><span class="o">,</span> <span class="n">element</span><span class="o">,</span> <span class="s">"empty catch clause"</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<h3 id="examples-of-analysis-processors">Examples of Analysis Processors</h3>
<p>The <a href="https://github.com/SpoonLabs/spoon-examples/blob/master/src/main/java/fr/inria/gforge/spoon/HelloWorldProcessor.java">HelloWorldProcessor example</a> prints hello world with compile-time reflection.</p>
<p>The <a href="https://github.com/SpoonLabs/spoon-examples/blob/master/src/main/java/fr/inria/gforge/spoon/analysis/CatchProcessor.java">CatchProcessor example</a> detects empty catch blocks.</p>
<p>The <a href="https://github.com/SpoonLabs/spoon-examples/blob/master/src/main/java/fr/inria/gforge/spoon/analysis/ReferenceProcessor.java">ReferenceProcessor example</a> detects circular references between packages.</p>
<p>This <a href="https://github.com/SpoonLabs/spoon-examples/blob/master/src/main/java/fr/inria/gforge/spoon/analysis/FactoryProcessor.java">Factory example</a> example detects wrong uses of the factory pattern.</p>
<h3 id="parallel-processor">Parallel Processor</h3>
<p>Let’s assume you want to use multiple cores for your processor. Spoon provides a simple high-level API for this task.
Using the <code class="language-plaintext highlighter-rouge">CatchProcessor</code> from before create a <code class="language-plaintext highlighter-rouge">AbstractParallelProcessor</code>.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="nc">Processor</span><span class="o"><</span><span class="nc">CtCatch</span><span class="o">></span> <span class="n">parallelProcessor</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">AbstractParallelProcessor</span><span class="o"><</span><span class="nc">CtCatch</span><span class="o">>(</span>
<span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="k">new</span> <span class="nc">CatchProcessor</span><span class="o">(),</span> <span class="k">new</span> <span class="nc">CatchProcessor</span><span class="o">()))</span> <span class="o">{};</span>
</code></pre></div></div>
<p>Now you have the same processor behavior as before, but 2 parallel running processors.
You can upscale this pretty high, but keep in mind to not use more parallel processors than available cores for maximum speedup.
For more information about parallel processor and the API have a look in the <a href="http://spoon.gforge.inria.fr/mvnsites/spoon-core/apidocs/spoon/processing/AbstractParallelProcessor.html">documentation</a>.</p>
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