有连接到POP3服务器的方法，获取邮件列表的方法，请求某些邮件的方法，删除邮件并断开的方法。
There are methods to connect to a POP3 server, to get a list of available emails, to request some emails, to delete some emails and to disconnect.
当一个分支断开时，正常情况下发往中心的请求被送到本地提供者，以便分支继续运行。
When a branch becomes disconnected, requests that normally go to the hub are sent to a local provider instead, so the branch continues operating.
在等待用户请求时，该对象会断开与底层JDBC连接的连接并在服务于用户请求时重新连接。
The object is disconnected from the underlying JDBC connection when waiting for a user request and reconnected when serving a user request.
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