With this explanation, you could argue that creating an AOP-based library to add logging logic to existing OOP-based bus

Just because I’m a visual learner, I think showing a basic example of how you’d go about implementing a sort of inject method to add AOP-based behavior would come a long way.

Figure 2: An example of a Feynman diagram. Here, an electron (e⁻) and a positron (e⁺) annihilate, producing a photon γ. The photon then becomes a quark-antiquark pair and after that, the antiquark radiates a gluon g (source).

This section follows closely this book by Feynman, Leighton, and Sands which I will henceforth call FLR. In it, Feynman describes a clever way to quickly evaluate derivatives of complicated, multi-product functions.

Great way to encapsulate cross-cutting concerns. I’m a big fan of encapsulation because it means you get easier to read and easier to maintain code that can be re-used all across your project.

“If you expect science to give all the answers to the wonderful questions about what we are, where we’re going, what the meaning of the universe is… you could easily become disillusioned and look for a mystic answer…[W]e’re exploring, trying to find out as much as we can about the world. People [ask], “Are you looking for the ultimate physics laws?” No, I’m not. I’m just looking to find out more about the world. If it turns out there is an ultimate law which explains everything, so be it; that would be very nice to discover. If it turns out it’s like an onion, with millions of layers… then that’s the way it is. But whatever way it comes out, it’s nature, and she’s going to come out the way she is! Therefore we shouldn’t pre-decide what it is we’re going to find, except to try to find out more. If you think that you are going to get an answer to some deep philosophical question, you may be wrong — it may be that you can’t get an answer to that particular problem by finding out more about the character of nature. But I don’t look at it like that; my interest in science is to find out more about the world, and the more I find out, the better.” — Richard Feynman

As noted by Physics Today, “Feynman’s calculus notes illustrate one of the famous physicist’s defining qualities: his insatiable curiosity… When he found a subject that interested him, he was not about to wait for the right teacher to come along; he was determined to master it himself.”

But before we move forward, notice the replaceMethod function, that’s where all the magic happens. That’s where the new function is created and where we decide when to call our aspect and what to do with its returned value.

He went back to his mom’s house that night, but she has no idea what to do either. She can’t believe it. Neither of us is on the front lines of feminism or anything, but we have always had frank, and open discussions about proper sexual conduct and general social “You don’t mistreat someone because of their race/gender/creed/etc. human is human.”

Nothing too fancy, a basic object with 3 methods. We want to inject two aspects that are generic to all of them. One to log the attributes received and one to analyze their returned value and log their type. Two aspects, two lines of code (instead of the six we would need).

Richard Feynman was an American theoretical physicist and co-recipient of the 1965 Nobel Prize in Physics (together with the American physicist Julian Schwinger and the Japanese physicist Shinichiro Tomonaga). He is one of the best-known scientists in the world. According to Wikipedia, “in a 1999 poll of 130 leading physicists worldwide by the British journal Physics World, he was ranked as one of the ten greatest physicists of all time”.

Feynman made several fundamental contributions to physics. These include the path integral formulation of quantum mechanics, the theory of quantum electrodynamics (developing pictorial representations describing the behavior of subatomic particles, the famous Feynman diagrams), and the theoretical explanation of the superfluidity of liquid helium. He also pioneered the field of quantum computing, introduced the concept of nanotechnology, among many other things. Feynman was also a famous popularizer of physics.

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gymnasts to look young. They are usually teenagers and small for their age. So they naturally look younger than a normal 16-year-old. But as the Chinese women’s gymnastics team took the floor, there were expressions of concern: they looked like children.

Flexible logic. The logic around your implementation of the advice and pointcuts can give you a lot of flexibility when it comes to injecting your aspects. This in turn can help to dynamically turn on and off different aspects (pun definitely intended) of your logic.

In the early 1930s, when Feynman was at Far Rockaway High School, he assembled a set of handwritten notes based on a book called Calculus for the Practical Man. At that time, it was unusual for a high school student to have a calculus instructor. The Practical Man series (by J.E. Thompson) were self-instruction books for those “who wish[ed] to obtain a practical mastery of some of the more usual and directly useful branches of the science without the aid of a teacher.” Feynman’s notes followed the book closely, and he “quite literally read Calculus for the Practical Man from cover to cover.”

Re-use aspects across projects. You can think of aspects as components, small and decoupled pieces of code that can run anywhere. If you write your aspects correctly, you can share them across different projects with ease.