Create Single Instance

All accounts and customers in the system are the retailer's, so it's not practical to create a single instance of Company and associate it with all accounts, so Company is omitted at this level.

因为系统中的所有账户和客户都是零售商的，所以创建一个单一的Company实例并使其与所有账户相关联是不切实际的，因此该层次中省略了Company。

When the host is asked to create a transaction, it creates an instance of DesignerTransactionImpl to manage the single change.

当宿主被要求创建事务时，它会创建DesignerTransactionImpl的一个实例来管理单个更改。

GlassFish Clustering is centered around an administrative domain which can then create a single server instance or clusters with multiple instances spread across distributed machines.

GlassFish集群以管理域为中心，然后可以创建单独的服务器实例或是使用遍布在分布式机器上的多个实例创建集群。