13.Reactor模型

Reactor

Reactor与Netty

public class Reactor implements Runnable {

    ServerSocketChannel serverSocketChannel;

    Selector selector;

    public Reactor(int port) {
        try {
            serverSocketChannel = ServerSocketChannel.open();
            selector = Selector.open();
            serverSocketChannel.socket().bind(new InetSocketAddress(9090));
            serverSocketChannel.configureBlocking(false);
            SelectionKey selectionKey = serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
            selectionKey.attach(new Acceptor(serverSocketChannel, selector));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while (true) {
            try {
                selector.select();
                Set<SelectionKey> selectionKeys = selector.selectedKeys();
                Iterator<SelectionKey> iterator = selectionKeys.iterator();
                while (iterator.hasNext()) {
                    SelectionKey selectionKey = iterator.next();
                    dispatcher(selectionKey);
                    iterator.remove();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private void dispatcher(SelectionKey selectionKey) {
        Runnable runnable = (Runnable) selectionKey.attachment();
        runnable.run();
    }
}

public class Acceptor implements Runnable {
    private ServerSocketChannel serverSocketChannel;
    private final int CORE = 8;

    private int index;

    private SubReactor[] subReactors = new SubReactor[CORE];
    private Thread[] threads = new Thread[CORE];
    private final Selector[] selectors = new Selector[CORE];

    public Acceptor(ServerSocketChannel serverSocketChannel) {
        this.serverSocketChannel = serverSocketChannel;
        for (int i = 0; i < CORE; i++) {
            try {
                selectors[i] = Selector.open();
            } catch (IOException e) {
                e.printStackTrace();
            }
            subReactors[i] = new SubReactor(selectors[i]);
            threads[i] = new Thread(subReactors[i]);
            threads[i].start();
        }
    }

    @Override
    public void run() {
        try {
            System.out.println("acceptor thread:" + Thread.currentThread().getName());
            SocketChannel socketChannel = serverSocketChannel.accept();
            System.out.println("有客户端连接上来了," + socketChannel.getRemoteAddress());
            socketChannel.configureBlocking(false);
            selectors[index].wakeup();
            SelectionKey selectionKey = socketChannel.register(selectors[index], SelectionKey.OP_READ);
            selectionKey.attach(new WorkHandler(socketChannel));
            if (++index == threads.length) {
                index = 0;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}