Signals in CLIPS

Here’s the translated version of the Go code to Java, with explanations in Markdown format suitable for Hugo:

Our program demonstrates how to handle signals in Java. While Java doesn’t have the exact equivalent of Go’s signal handling, we can use the sun.misc.Signal class to achieve similar functionality.

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

public class SignalHandling {
    public static void main(String[] args) {
        // Java signal handling works by registering a SignalHandler
        // for specific signals. We'll create a handler for SIGINT and SIGTERM.
        SignalHandler handler = new SignalHandler() {
            public void handle(Signal signal) {
                System.out.println();
                System.out.println(signal.getName());
                System.exit(0);
            }
        };

        // Register the handler for SIGINT and SIGTERM
        Signal.handle(new Signal("INT"), handler);
        Signal.handle(new Signal("TERM"), handler);

        // This could be done in a separate thread to demonstrate
        // a more realistic scenario of graceful shutdown.
        System.out.println("awaiting signal");

        // The program will wait here until it receives a signal
        try {
            Thread.sleep(Long.MAX_VALUE);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

When we run this program it will block waiting for a signal. By typing ctrl-C (which the terminal shows as ^C) we can send a SIGINT signal, causing the program to print INT and then exit.

$ javac SignalHandling.java
$ java SignalHandling
awaiting signal
^C
INT

Note that using sun.misc.Signal is not recommended for production code as it’s not part of the standard Java API and may not be available in all Java implementations. For production use, consider using a more robust solution like Apache Commons Daemon or creating a shutdown hook using Runtime.getRuntime().addShutdownHook().

Environment Variables in CLIPS

Exit in CLIPS

Learn X By Example

Title here

Signals in CLIPS