Signaling

This in an experiment that re-creates the basis of SolidJS in Java: Signals and effects.

The target was to have a lib that allows this:

var loggedIn = cx.createSignal(false);
var secretValue = cx.createSignal("s3cr3t");

cx.createEffect(() -> {
    print("Hi! ")
    if (loggedIn.get()) {
        println("The secret is : "+secretValue.get());
    }else{
        println("You shall not see the secret!");
    }
});

secretValue.set("other");//nothing happens
loggedIn.set(true);//"Hi! The secret is : other" is logged
secretValue.set("s3cr3t");//"Hi! The secret is : s3cr3t" is logged

Also support for nested effects (caused a lot of headache!) was important. Example:

cx.createEffect(() -> {
    if (loggedIn.get() && expensiveApiCall()) {
        cx.createEffect(()->println("The secret is : "+secretValue.get()));
    }else{
        println("You shall not see the secret!");
    }
});

This causes that the expensiveApiCall login check is only executed when loggedIn changes and not when secretValue changes since it only triggers the inner event!

All the examples above are runnable! See UseEffectTest.java! The behaviour is nearly exactly the same as SolidJS (a few performance improvements are missing)

Features

I have close to 100% codecoverage but not casecoverage so don't take everything for granted

• Defered execution of nested effects for performance
• Nested effects actualy work - amazing i know
• No unsubscribing needed! As soon as a signal goes out of scope all related effects are removed!
• Noop effects are cleaned automatically - no waste.
• Thread-safe (but blocking!)

Licence

Do whatever the f you want with it