Java.NIO 关于写混乱

Question

I have a confusion on the onWrite method of Java NIO, when the selector is ready to write should I:

1: Register/Change 一个 OP_Write

2：如果写returns0怎么办？

3：写完是注册还是改操作？

通道设置为非阻塞

....onAccept register OP_READ

public void onWrite()
{
            ByteBuffer bb = ByteBuffer.wrap(msg.encode());

            while(bb.remaining()!= 0){
                int ret = socketChannel.write(bb);

                if(ret == 0){

                    //Should I register or should I change op?

                    //socketChannel.register(selector, SelectionKey.OP_WRITE, null);

                    //selectionKey.interestOps(SelectionKey.OP_WRITE);
                }
            }

            //Is it necessary to change op or re-register Read or 0

            //socketChannel.register(selector, SelectionKey.OP_READ, null);
            //selectionKey.interestOps(SelectionKey.OP_READ);
            //selectionKey.interestOps(0);
}

我正在努力实现尽可能低的延迟。通道不会回显，它只会读取或写入。

Answer 1

when the selector is ready to write should I:

1: Register/Change a OP_Write

已经注册了。这没有意义。

2: If Write returns 0 what should I do?

注册OP_WRITE。

3: After writing should I Register or Change ops?

如果 return 不为零，注销 OP_WRITE。

The channel is set to Non-Blocking

当然可以，不然什么都注册不了

基本上你把整个问题都从头到尾了。在情况 (2) 中，您应该仅注册 OP_WRITE。不是所有的时间。有事就写，然后找案例2。然后，当OP_WRITE触发时，写并找案例3。

Java.NIO 关于写混乱

Java.NIO on Write confusion

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