Create generic Java method wrapper for pre and post processing

Question

I'm basically trying to create a static method that will serve as a wrapper for any method I pass and will execute something before and after the actual execution of the method itself. I'd prefer to do it using Java 8 new coding style. So far I have a class that has a static method, but I'm not sure what the parameter type should be so it can take any method with any type of parameter and then execute it. Like i mentioned I want to do some stuff before and after the method executes.

For example: executeAndProcess(anyMethod(anyParam));

Answer 1

Your method can accept a Supplier instance and return its result:

static <T> T executeAndProcess(Supplier<T> s) {
    preExecute();
    T result = s.get();
    postExecute();
    return result;
}

Call it like this:

AnyClass result = executeAndProcess(() -> anyMethod(anyParam));