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| <h1 id="chapter-7---handler">Chapter 7 - Handler</h1> |
| <p>Handles all I/O events fired by MINA. The interface is hub of all activities done at the end of the Filter Chain.</p> |
| <p>IoHandler has following functions</p> |
| <ul> |
| <li>sessionCreated</li> |
| <li>sessionOpened</li> |
| <li>sessionClosed</li> |
| <li>sessionIdle</li> |
| <li>exceptionCaught</li> |
| <li>messageReceived</li> |
| <li>messageSent</li> |
| </ul> |
| <h2 id="sessioncreated-event">sessionCreated Event</h2> |
| <p>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.</p> |
| <p>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.</p> |
| <h2 id="sessionopened-event">sessionOpened Event</h2> |
| <p>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.</p> |
| <h2 id="sessionclosed-event">sessionClosed Event</h2> |
| <p>Session Closed event is closed, when a session is closed. Session cleaning activities like cash cleanup can be performed here.</p> |
| <h2 id="sessionidle-event">sessionIdle Event</h2> |
| <p>Session Idle event is fired when a session becomes idle. This function is not invoked for UDP transport.</p> |
| <h2 id="exceptioncaught-event">exceptionCaught Event</h2> |
| <p>This functions is called, when an Exception is thrown by user code or by MINA. The connection is closed, if its an IOException.</p> |
| <h2 id="messagereceived-event">messageReceived Event</h2> |
| <p>Message Received event is fired whenever a message is received. This is where the most of the processing of an application happens. You need to take care of all the message type you expect here.</p> |
| <h2 id="messagesent-event">messageSent Event</h2> |
| <p>Message Sent event is fired, whenever a message aka response has been sent(calling IoSession.write()).</p> |
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