@Override
    public List<Connection> getAll(String poolKey) {
        ConnectionPool pool = this.getConnectionPool(this.connTasks.get(poolKey));
        return null == pool ? new ArrayList<Connection>() : pool.getAll();
    }
@see com.alipay.remoting.ConnectionManager#getAll(java.lang.String)
src/main/java/com/alipay/remoting/DefaultConnectionManager.java