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<!DOCTYPE html>
<html lang="en">
<html>
<head>
<meta charset="utf-8">
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<title>Agent | Spoon</title>
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<h1 class="post-title-main">Agent</h1>
</div>
<div class="post-content">
<h1 id="spoon-agent">Spoon Agent</h1>
<p>Spoon can also be used to transform classes at load time in the JVM. For this, <code class="language-plaintext highlighter-rouge">SpoonClassFileTransformer</code> provide an abstraction of <code class="language-plaintext highlighter-rouge">ClassFileTransformer</code>
where the user can define Spoon transformation.
Bytecode of classes will be decompiled on-the-fly when loaded, and the Spoon AST will be updated in consequence, and the code is recompiled on-the-fly.</p>
<p>The following example shows the definition of a basic JVM agent for inserting a tracing method call at the end of every method called <code class="language-plaintext highlighter-rouge">foo</code>.</p>
<p>Here is the agent:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">class</span> <span class="nc">Agent</span> <span class="o">{</span>
<span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">premain</span><span class="o">(</span><span class="nc">String</span> <span class="n">agentArgs</span><span class="o">,</span> <span class="nc">Instrumentation</span> <span class="n">inst</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span> <span class="s">"Hello Agent"</span> <span class="o">);</span>
<span class="c1">//Create a SpoonClassFileTransformer, that</span>
<span class="c1">// * excludes any classes not in our package from decompilation</span>
<span class="c1">// * adds the statement System.out.println("Hello <className>"); to the (first) method named "foo" of every classes</span>
<span class="nc">SpoonClassFileTransformer</span> <span class="n">transformer</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">SpoonClassFileTransformer</span><span class="o">(</span>
<span class="n">cl</span> <span class="o">-></span> <span class="n">cl</span><span class="o">.</span><span class="na">startsWith</span><span class="o">(</span><span class="s">"org/my/package"</span><span class="o">),</span>
<span class="k">new</span> <span class="nf">InsertPrintTransformer</span><span class="o">()</span>
<span class="o">);</span>
<span class="n">inst</span><span class="o">.</span><span class="na">addTransformer</span><span class="o">(</span><span class="n">transformer</span><span class="o">);</span>
<span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span> <span class="s">"Agent Done."</span> <span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">class</span> <span class="nc">InsertPrintTransformer</span> <span class="kd">implements</span> <span class="nc">TypeTransformer</span> <span class="o">{</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">boolean</span> <span class="nf">accept</span><span class="o">(</span><span class="nc">CtType</span> <span class="n">type</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">((</span><span class="n">type</span> <span class="k">instanceof</span> <span class="nc">CtClass</span><span class="o">)</span> <span class="o">&&</span>
<span class="n">type</span><span class="o">.</span><span class="na">getMethodsByName</span><span class="o">(</span><span class="s">"foo"</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="k">return</span> <span class="kc">true</span><span class="o">;</span>
<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
<span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">transform</span><span class="o">(</span><span class="nc">CtType</span> <span class="n">type</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">System</span><span class="o">.</span><span class="na">err</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"Transforming "</span> <span class="o">+</span> <span class="n">type</span><span class="o">.</span><span class="na">getQualifiedName</span><span class="o">());</span>
<span class="nc">CtMethod</span> <span class="n">main</span> <span class="o">=</span> <span class="o">(</span><span class="nc">CtMethod</span><span class="o">)</span> <span class="n">type</span><span class="o">.</span><span class="na">getMethodsByName</span><span class="o">(</span><span class="s">"foo"</span><span class="o">).</span><span class="na">get</span><span class="o">(</span><span class="mi">0</span><span class="o">);</span>
<span class="n">main</span><span class="o">.</span><span class="na">getBody</span><span class="o">().</span><span class="na">addStatement</span><span class="o">(</span><span class="n">type</span><span class="o">.</span><span class="na">getFactory</span><span class="o">().</span><span class="na">createCodeSnippetStatement</span><span class="o">(</span><span class="s">"System.out.println(\"Hello "</span> <span class="o">+</span> <span class="n">type</span><span class="o">.</span><span class="na">getQualifiedName</span><span class="o">()</span> <span class="o">+</span> <span class="s">"\");"</span><span class="o">));</span>
<span class="nc">System</span><span class="o">.</span><span class="na">err</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"Done transforming "</span> <span class="o">+</span> <span class="n">type</span><span class="o">.</span><span class="na">getQualifiedName</span><span class="o">());</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<p>:warning: The <code class="language-plaintext highlighter-rouge">SpoonClassFileTransformer</code> feature (and all features relying on decompilation) are not included in <code class="language-plaintext highlighter-rouge">spoon-core</code> but in <code class="language-plaintext highlighter-rouge">spoon-decompiler</code>. If you want to use them you should declare a dependency to <code class="language-plaintext highlighter-rouge">spoon-decompiler</code>.</p>
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