private int getActiveConnectionsLimit() {
        Integer limit = activeConnectionsLimit.getOrDefault();
        if (limit == -1) {
            limit = defaultActiveConnectionsLimit.getOrDefault();
            if (limit == -1) {
                limit = Integer.MAX_VALUE;
            }
        }
        return limit;
    }
Predicate with the logic of filtering out circuit breaker tripped servers and servers 
with too many concurrent connections from this client.

@author awang
ribbon-loadbalancer/src/main/java/com/netflix/loadbalancer/AvailabilityPredicate.java