Async Argument

To parse arguments asynchronously you can choose from three different ways:

Add @Async annotation before argument
Use argument with the CompletableFuture<T> type
Create custom ArgumentResolver with an async result (Coming Soon)

1. `@Async` annotation

You need to use the @Async annotation on the argument:

Java

@Command(name = "user")
public class UserCommand {

    @Execute(name = "load")
    void execute(@Async @Arg User argument) {
        System.out.print("This message is triggered in the main thread!");
    }
}

WARNING

The @Async annotation on the argument will parse the argument asynchronously, but the command will be executed in the main thread.

2. `CompletableFuture<T>` type

Using CompletableFuture<T> is more complicated:

java

@Command(name = "user")
public class UserCommand {

    @Execute(name = "load")
    void execute(@Arg CompletableFuture<User> argument) {
        System.out.print("This message is triggered in the main thread!");
        
        argument.whenComplete((user, error) -> {
            if (error != null) {
                return;
            }
            
            System.out.print("This message is triggered asynchronously!");
        });
    }
}