Grails Groovy: Execute Code transparent before and after any method is invoked | Override Method Implementation | Override Method Body.
Note:-
- Make sure the returned value from the method call is returned from the closure as well
- Might be a expensive of a class has number of methods with heavy implementation
- If selective execution is required, then check for the method name and then intercept the call
class Dummy { def method1() { System.out.println "In method 1" } def method2(String str) { System.out.println "In method 2" } static def method3(int a, int b) { System.out.println "In static method 3" } } Dummy.metaClass.invokeMethod = {String name, List args -> def result = null System.out.println("Do something before $name is called with args $args") try { result = delegate.metaClass.getMetaMethod(name, args).invoke(delegate, args) } catch(Exception e) { System.out.println "Handling exception for method $name" } System.out.println("Do something after $name was called with args $args") return result } Dummy.metaClass.'static'.invokeMethod = {String name, List args -> def result = null System.out.println("Do something before static method $name is called with args $args") try { result = delegate.metaClass.getMetaMethod(name, args).invoke(delegate, args) } catch(Exception e) { System.out.println "Handling exception for method $name" } System.out.println("Do something after static method $name was called with args $args") return result } def dummy = new Dummy() dummy.method1() dummy.method2('Test') Dummy.method3(1, 2)
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