def instant = end.get()
        if (instant == null) {
            throw new IllegalStateException("Operation '$name' has not completed yet.")
        }
        return instant
    }

    Duration getDuration() {
        return getEnd() - start
    }

    void completed(Instant when) {
        end.compareAndSet(null, when)
    }

        // As this is _roughly_ the amount of time that is avoided by reusing the outputs,
        // which is currently the _only_ thing this value is used for.
        Duration originExecutionTime = result.getDuration().plus(Duration.ofMillis(snapshotOutputDuration));
        HashCode buildCacheKey = ((BuildCacheKeyInternal) cacheKeyCalculatedState.getKey()).getHashCodeInternal();
        return new OriginMetadata(

        return new DefaultAnnotationProcessorResult(result.getClassName(), toAnnotationProcessorResultType(result.getType()), result.getDuration());
    }

    private static AnnotationProcessorResult.Type toAnnotationProcessorResultType(String type) {
        if (type.equals(InternalAnnotationProcessorResult.TYPE_AGGREGATING)) {