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The Runtime for the Flabbergast Configuration Language on the JVM.

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package flabbergast;

import java.util.HashMap;
import java.util.Map;

import java.util.concurrent.atomic.AtomicInteger;

public class StringToCodepoints extends Computation implements ConsumeResult {
    private AtomicInteger interlock = new AtomicInteger();
    private String input;

    private SourceReference source_reference;
    private Context context;
    private Frame container;

    public StringToCodepoints(TaskMaster task_master,
                              SourceReference source_ref, Context context, Frame self,
                              Frame container) {
        super(task_master);
        this.source_reference = source_ref;
        this.context = context;
        this.container = self;
    }
    @Override
    public void consume(Object result) {
        if (result instanceof Stringish) {
            input = result.toString();
            if (interlock.decrementAndGet() == 0) {
                task_master.slot(this);
            }
        } else {
            task_master.reportOtherError(source_reference,
                                         "Input argument must be a string.");
        }
    }

    @Override
    protected void run() {
        if (input == null) {
            interlock.set(2);
            Computation input_lookup = new Lookup(task_master,
                                                  source_reference, new String[] {"arg"}, context);
            input_lookup.listen(this);
            if (interlock.decrementAndGet() > 0) {
                return;
            }
        }
        MutableFrame frame = new MutableFrame(task_master, source_reference,
                                              context, container);
        for (int it = 0; it < input.length(); it++) {
            frame.set(TaskMaster.ordinalNameStr(it + 1),
                      (long) input.codePointAt(it));
        }
        result = frame;
    }
}