Shulou(Shulou.com)06/02 Report--

This article focuses on "how to use Quarkus/GraalVM to compile JGroups into an executable file", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor learn how to use Quarkus/GraalVM to compile JGroups into an executable file.

What?

Quarkus is a framework for compiling Java code into native code (using GraalVM) and removing code that is not needed at runtime.

Quarkus analyzes the code during the build phase and removes code that is not in use at run time to have a small executable that can be started quickly. However, this means that reflection cannot be used at run time because all unused classes are deleted at build time. However, you can use reflection at build time.

Another limitation that affects JGroups is the creation of threads and sockets. Neither can be done at build time, but must be done at run time.

So what's the point of providing JGroups extensions for Quarkus?

Although a JGroups application can be compiled directly to native code (using a native image of GraalVM), it is cumbersome and must be rebuilt to accommodate native compilation limitations.

Instead, the JGroups extension provides a JChannel that can be injected into the application. Channels have been created according to the configuration file and connected through an extended connection (= join the cluster). The extension is responsible for performing reflection, socket creation, and thread startup at the right time (build or run time), and users don't have to worry about this.

How?

Next, let's look at a concrete example.

POM introduces extension groupId=org.jgroups.quarkus.extension and artifactId=quarkus-jgroups. This provides an injectable JChannel.

The main class is ChatResource and the code is as follows:

@ ApplicationScoped @ Path ("/ chat") public class ChatResource extends ReceiverAdapter implements Publisher {protected final Set

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