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POTracking method invocations in Groovy closure
 

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    <p>I'm writing a small DSL for reactive evaluation, need help with metaprogramming in Groovy.</p> <p>Sample DSL code:</p> <pre><code>Signal&lt;Integer&gt; a = var(1) Signal&lt;Integer&gt; b = var(2) Signal&lt;Integer&gt; c = signal { a(it) + b(it) } </code></pre> <p>The 'var' function creates new <code>Signal</code> instance.</p> <p>The <code>signal</code> function needs a list of <code>Signal</code> instances inside the closure (references to <code>a</code> and <code>b</code> in example).</p> <p>Working implementation:</p> <pre><code>interface Signal&lt;T&gt; { T now() } Signal.metaClass.call = { dependencies -&gt; dependencies?.add(delegate) delegate.now() } def signal = { Closure&lt;?&gt; body -&gt; def dependencies = new HashSet&lt;&gt;() body.call(dependencies) createSignal(dependencies, body) } </code></pre> <p>Is there any way to awoit passing <code>it</code> variable, so sample looks like</p> <pre><code>Signal&lt;Integer&gt; a = var(1) Signal&lt;Integer&gt; b = var(2) Signal&lt;Integer&gt; c = signal { a() + b() } </code></pre> <p><strong>EDIT:</strong> Stub <code>Signal</code> implementation for testing:</p> <pre><code>class SignalStub&lt;T&gt; implements Signal&lt;T&gt; { T value Collection&lt;Signal&lt;?&gt;&gt; dependencies static def var(value) { new SignalStub&lt;&gt;(value: value, dependencies: [])} static def createSignal(deps, body) { new SignalStub&lt;Object&gt;(value: body.call(), dependencies: deps) } @Override T now() { return value } } </code></pre> <p>Test case for DSL:</p> <pre><code>def a = var(1) def b = var(2) def c = signal { a() + b() } assert c.now() == 3 assert c.dependencies.contains(a) assert c.dependencies.contains(b) </code></pre>
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