Inspection / Hooks / Aspect-oriented programming

Sometimes, we may want to add some logic when things like Dart-call-Rust starts and ends. For example, we may want to print a log line when it starts or ends, or we may want to do a simple timing to find the slow function. We can do it easily in both Rust and Dart side.

Rust

You can write your own Executor, which wraps the default executor and do some extra work.

TODO: explain how to use your own (create an issue if you want to know and this doc is still not updated).

Dart

Similarly, you can utilize the BaseHandler class by providing your own subclass. Then, provide your subclass during initialization:

await RustLib.init(handler: YourCustomHandler());

For a working example (and is tested continuously in CI), please refer to this file.