【Mina】IoHandler

IoHandler有以下方法：

• sessionCreated
• sessionOpened
• sessionClosed
• sessionIdle
• exceptionCaught
• messageReceived
• messageSent

其中不容易区分的就是sessionCreated和sessionOpened（在前面也讲过），在说明文档中是这样说的：

 

Session Created event is fired when a new connection is created. For TCP its the result of connection accept, and for UDP this is generated when a UDP packet is received. This function can be used to initialize session attributes, and perform one time activities for a particular connection.

This function is invoked from the I/O processor thread context, hence should be implemented in a way that it consumes minimal amount of time, as the same thread handles multiple sessions.

 

SessionCreated：当连接连接上就发出这个消息；而且这个是在I/O处理线程上下文中进行调用的，所以这个函数要用最小的处理时间，这个线程还要处理多个session

 

而sessionOpened：

Session opened event is invoked when a connection is opened. Its is always called after sessionCreated event. If a thread model is configured, this function is called in a thread other than the I/O processor thread.

sessionOpened实在sessionCreated事件之后调用，如果线程模型被配置好了，则在对应的处理线程中进行调用，而不是在I/O处理线程中调用；