goal.omg

// events are records that have some special static methods that allows for event handling.
event Hello{
    String hello;
}

event World{
    String world;
}

// run creates a new isolated runtime when an event is triggered.
// Main is an event that is triggered once when the application starts.
run (Main) {
    // just need to decare some variables in this scope so they survive the async block.
    String hello = "";
    String world = "";

    // async block allows for all expressions to be run at the same time. 
    // but will only exit the block when all expressions are completed.
    async {
        // next will pause execution until the next event of the type is emitted by someone.
        hello = Hello.next().hello;
        // since this is async block both next will pause at the same time.
        world = World.next().world;
    }

    // We don't know if hello or world was set first but we know that both are set now.
    printLine(hello + world);
}

run (Main){
    // emit publishes a new event that may result in new runtime being spawned or other can query for.
    Hello.emit(new Hello("Hello "));
}

run (Main){
    World.emit(new World("world!"));
}