ChannelFuture Status in Netty

ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));

 

这里解释一下channelFuture：

在Netty中所有的io操作都是异步的，这也就是意味任何io访问，那么就立即返回处理，并且不能确保
返回的数据全部完成。因此就出现了channelFuture，channelFuture在传输数据时候包括数据和状态两个
部分。

Uncompleted和Completed :

 
 *                                      +---------------------------+
 *                                      | Completed successfully    |
 *                                      +---------------------------+
 *                                 +---->      isDone() = <b>true</b>      |
 * +--------------------------+    |    |   isSuccess() = <b>true</b>      |
 * |        Uncompleted       |    |    +===========================+
 * +--------------------------+    |    | Completed with failure    |
 * |      isDone() = <b>false</b>    |    |    +---------------------------+
 * |   isSuccess() = false    |----+---->   isDone() = <b>true</b>         |
 * | isCancelled() = false    |    |    | getCause() = <b>non-null</b>     |
 * |    getCause() = null     |    |    +===========================+
 * +--------------------------+    |    | Completed by cancellation |
 *                                 |    +---------------------------+
 *                                 +---->      isDone() = <b>true</b>      |
 *                                      | isCancelled() = <b>true</b>      |
 *                                      +---------------------------+