文件系统遭卸装或光纤通道适配器被断开连接。
Examples include file systems being unmounted or Fibre Channel adapters being disconnected.
然后，应用程序用register调用向选择器注册通道(文件描述符)和感兴趣的操作。
The application then registers channels (file descriptors) and interested operations to the selector with a register call on the channel.
services - config . xml：引用其他配置文件且提供安全约束、通道和日志记录的顶级配置文件。
Services-config.xml: the top-level configuration file that references the other configuration files and also provides security constraints, channels, and logging.
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