private Future<Boolean> makeConnectionASync(final Server s, 
            final PrimeConnectionListener listener) throws InterruptedException, RejectedExecutionException {
        Callable<Boolean> ftConn = new Callable<Boolean>() {
            public Boolean call() throws Exception {
                logger.debug("calling primeconnections ...");
                return connectToServer(s, listener);
            }
        };
        return executorService.submit(ftConn);
    }
Prime servers asynchronously.

@param servers
@param listener
ribbon-loadbalancer/src/main/java/com/netflix/client/PrimeConnections.java