getDefaultRegistry that does not throw

[ellisjoe]

No description provided.

[ellisjoe]

In library code I'd like to avoid using exceptions for control flow. Currently I have to write something like:

    private static MetricRegistry getMetricRegistry() {
        try {
            return SharedMetricRegistries.getDefault();
        } catch (IllegalStateException e) {
            return new MetricRegistry();
        }
    }

Ideally this method would return an Optional and I could then simplify the above to SharedMetricRegistries.getDefault().orElseGet(MetricRegistry::new), but it looks like metrics still supports Java 7.

[arteam]

LGTM! Thank you for the contribution!

I think we could provide a similar method for SharedHealthCheckRegistries too.