private BlockingQueue<Connection> pool = new LinkedBlockingQueue<Connection>(10);
private AtomicInteger connCount = new AtomicInteger();

public Connection getConnection() {
    Connection conn = pool.poll(10, TimeUnit.MILLISECONDS);
    if (conn == null) {
        synchronized (connCount) {
            if (connCount.get() < 10) {
                conn = getNewConnection();
                pool.offer(conn);
                connCount.incrementAndGet();
            }
        }
        conn = pool.take();
    }

    return conn;
}