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  • Rank 299,923 (Top 6 %)
  • Language
    Java
  • License
    Eclipse Public Li...
  • Created almost 3 years ago
  • Updated 9 months ago

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Repository Details

Experimenting with Project Loom

Project Loom Lab

Experiments with Project Loom's features based on these JEPs:

This includes experimenting with these features directly as well as activating them in web frameworks.

You need Java 21.

Experiments

Change into the project folder experiments and build it with mvn package to get target/loom-experiments.jar. To run it:

java --enable-preview -p target/loom-experiments.jar -m loom.experiments $EXPERIMENT $ARGUMENTS

Where:

  • $EXPERIMENT selects one of the experiments by name
  • $ARGUMENTS configures the experiment

For details on these, see specific experiments below.

Disk Stats

Walks over all folders and files in a given directory to gather their respective sizes. Can be configured to either run as a single thread or with one virtual thread for each file/folder.

Echo Client & Server

A client and server that exchange messages via sockets on localhost:8080. Client protocol:

  • sends a single line, terminated by a newline
  • waits for a single line (i.e. a string terminated by a newline) to be received

Server protocol:

  • reads a single line (i.e. a string terminated by a newline) from that socket
  • waits a predetermined amount of time
  • replies with the same string, including the newline

To try this out, run the client and the server in different shells.

Note: For a much more thorough experiment with an echo server, check out Elliot Barlas' project-loom-experiment.

GitHub Crawler

Starting from a given seed URL, crawls GitHub pages and prints their connections and statistics. Only runs with virtual threads but also uses/demonstrates some data-oriented programming concepts.

Frameworks

Spring Boot

Change into the project folder frameworks/spring_boot and build with mvn package, then run it with:

java -jar target/loom-spring-boot.jar

Once launched, visit http://localhost:8080/api/current-thread. To switch to virtual threads, append the command line parameter virtual. The switch is implemented in SpringBootApplication, which explicitly replaces the executors used to submit requests to.

As far as I know, the blog post Embracing Virtual Threads is the most up-to-date documentation on Spring and virtual threads.

Quarkus

Change into the project folder frameworks/quarkus and build with mvn package, then run it with:

java --add-opens java.base/java.lang=ALL-UNNAMED -jar target/quarkus-app/quarkus-run.jar

Once launched, visit http://localhost:8080/api/current-thread. To switch to virtual threads, edit QuarkusEndpoints and uncomment @RunOnVirtualThread, which allows configuring virtual threads for individual endpoints. This annotation requires the --add-opens. The artifact quarkus-netty-loom-adaptor (see pom.xml) seems to improve performance of Quarkus on virtual threads.

As far as I know, the blog post Writing simpler reactive REST services with Quarkus Virtual Thread support is the most up-to-date documentation on Quarkus and virtual threads.

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