This project is a quick app to show how much more "scalability" project loom can provide to a vanilla spring app.
The application is purposefully very simple, but it tries to replicate a common scenario in (micro)services:
an HTTP request comes in, an external service is called and a row is added to a database
This is a scenario that normally can be scaled by tweaking and increasing the thread pool size that server the
incoming HTTP requests; on purpose, no defaults were changed in the spring application configuration, only the
flag that enables virtual threads (spring.threads.virtual.enabled) - to have a like for like comparison and
also .
The external service call has been simulated via MockServer; the external request adds a fixed delay of 500ms to the responses, to simulate on purpose "long" pauses which are common in scenarios where your service has a dependency which has (long)er response times.
A locust script is included to cause load on the system.
The result directory contains, commented, the results of the tests run.
To run locally, you will need:
- a running MySQL or MariaDB - can be installed locally, or run via docker
- running the local mockserver - can be run via maven with the command
mvn process-test-resources org.mock-server:mockserver-maven-plugin:5.15.0:run
- running locust - you will need a recent python (3.10+) and install locust as per its documentation
- the locust script can be run via
locust -H http://localhost:8080
- the locust script can be run via
- The application can be run via the usual
mvn spring-boot:run- ensure the database connection is correct in the spring application config
- To switch native thread vs virtual thread (loom), change the
spring.threads.virtual.enabledconfig