What's the supsend/resume/stop/terminate action theory? #10419

Tan-JiaLiang · 2023-01-28T08:46:28Z

Tan-JiaLiang
Jan 28, 2023

Argo workflow provide supsend/resume/stop/terminate action, when i using the JVM container to run, how can i catch the action in my java code? Like some signal?

wesleyscholl · 2024-12-15T01:59:18Z

wesleyscholl
Dec 15, 2024

@Tan-JiaLiang

The Argo Workflows, suspend, resume, stop, and terminate actions control the execution flow of workflows.

Suspend: Pauses the workflow at a specified point and remains in a suspended state until manually resumed.

Resume: Resumes the execution of a previously suspended workflow.

Stop: Ceases the workflow execution but allows running steps to complete. No new steps are scheduled, however, exit handlers are executed.

Terminate: Immediately terminates the workflow without running any exit handlers.

To handle these actions within a Java application within a container, signal handling can be implemented to catch termination signals sent to the container. Allowing the Java application to perform necessary cleanup and/or state-saving operations before shutdown.

To handle termination signals in a Java application running within a container, the sun.misc.Signal class can be used to set up signal handlers.

import sun.misc.Signal;
import sun.misc.SignalHandler;

public class SignalCatcher {
    public static void main(String[] args) {
        Signal.handle(new Signal("TERM"), new SignalHandler() {
            @Override
            public void handle(Signal sig) {
                System.out.println("Received TERM signal. Performing cleanup...");
                // Perform cleanup operations here
                System.exit(0);
            }
        });

        // Application logic here
        while (true) {
            // Simulate work
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }
    }
}