我是新來的NIO我理解異步套接字的概念,但我對非阻塞部分感到困惑。如何java-nio是非阻塞混淆
我正在使用java的NIO選擇器。我的服務器代碼是
public class EcoNonBlockingIOServer_7 {
public static int PORT_NUMBER = 5555;
public static void main(String[] argv) throws Exception {
new EcoNonBlockingIOServer_7().go(argv);
}
public void go(String[] argv) throws Exception {
int port = PORT_NUMBER;
if (argv.length > 0) { // Override default listen port
port = Integer.parseInt(argv[0]);
}
System.out.println("Listening on port " + port);
// Allocate an unbound server socket channel
ServerSocketChannel serverChannel = ServerSocketChannel.open();
// Get the associated ServerSocket to bind it with
ServerSocket serverSocket = serverChannel.socket();
// Create a new Selector for use below
Selector selector = Selector.open();
// Set the port the server channel will listen to
serverSocket.bind(new InetSocketAddress(port));
// Set nonblocking mode for the listening socket
serverChannel.configureBlocking(false);
// Register the ServerSocketChannel with the Selector
serverChannel.register(selector, SelectionKey.OP_ACCEPT);
while (true) {
// This may block for a long time. Upon returning, the
// selected set contains keys of the ready channels.
int n = selector.select();
if (n == 0) {
continue; // nothing to do
}
// Get an iterator over the set of selected keys
Iterator it = selector.selectedKeys().iterator();
// Look at each key in the selected set
while (it.hasNext()) {
SelectionKey key = (SelectionKey) it.next();
// Is a new connection coming in?
if (key.isAcceptable()) {
ServerSocketChannel server = (ServerSocketChannel) key.channel();
SocketChannel channel = server.accept();
registerChannel(selector, channel, SelectionKey.OP_READ);
sayHello(channel);
}
// Is there data to read on this channel?
if (key.isReadable()) {
readDataFromSocket(key);
}
// Remove key from selected set; it's been handled
it.remove();
}
}
}
現在我的查詢是:
如果註冊成爲我們與它總是被封鎖在selector.select(任何操作選擇的頻道)它再怎麼是非阻塞。
如果我們承認它使用OP_ACCEPT作爲鍵並相應地映射通道但是鍵值是可以接受的我將這個通道選擇器修改爲OP_READ,因爲它已經被接受。讀事件上selector.select()它再次塊
*請糾正我的理解,如果我錯*
此鏈接可能會幫助你。 http://www.javaworld.com/article/2078654/java-se/five-ways-to-maximize-java-nio-and-nio-2.html – 2014-09-02 11:58:59