Service

#import "Extensions/Service";

Compile-time services. A jaic extension, not official Jai: other Jai compilers have no such module, and it may change between jaic releases. See docs/extensions/service.md.

A service is a long-lived program that compile-time code asks questions: one that keeps a database connection open, say, so #run code can learn a query's types without connecting on every compile. The compiler starts it the first time it is called (jaic <file> -interp), keeps it running between calls, and restarts it when its sources change.

The service side (service.jai):

#import "String";
Service :: #import "Extensions/Service";
main :: () {
    Service.serve((request: string) -> Service.Status, string {
        return .OK, to_upper_copy(request);
    });
}

SERVICE :: #run tprint("%service.jai", #filepath);
#run {
    status, answer := Service.call(SERVICE, "hello");
    if status == {
        case .OK;          print("%\n", answer);
        case .PENDING;     Service.unknown("asking the service");   // editor only
        case .UNAVAILABLE; Service.unknown(answer);
        case .FAILED;      compiler_report(answer);
    }
}