How to do sequence of operations and ensure one operation is complete before next one in Spring Reactor web app?

Question

I have Spring Boot 2 web app in which I need to identify site visitor by cookie and gather page view stats. So I need to intercept every web request. The code I had to write is

Answer 1

For gathering page view stats I'll suggest to change the strategy and use Actuator and Micrometer instead:

1. Add the actuator dependency to your project
2. Expose the relevant endpoints (here, metrics)
3. Go to /actuator/metrics and select the metric for server HTTP requests (see the reference documentation).

Micrometer offers way more and helps you to get your metrics right, like: taking into account GC pauses when measuring time, providing histograms/percentiles/..., and more.