Examples with Selector java.nio.channels.Selector used on opensource projects

Example 76 with Selector

use of java.nio.channels.Selector in project jeromq by zeromq.

the class Ctx method createSelector.

// Creates a Selector that will be closed when the context is destroyed.
public Selector createSelector() {
    try {
        Selector selector = Selector.open();
        assert (selector != null);
        selectors.add(selector);
        return selector;
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

Example 77 with Selector

use of java.nio.channels.Selector in project cradle by BingLau7.

the class PlainNioServer method serve.

public void serve(int port) throws IOException {
    ServerSocketChannel serverChannel = ServerSocketChannel.open();
    serverChannel.configureBlocking(false);
    ServerSocket ss = serverChannel.socket();
    // 将服务器绑定到选定端口
    InetSocketAddress address = new InetSocketAddress(port);
    ss.bind(address);
    // 打开 Selector 来处理 Channel
    Selector selector = Selector.open();
    // 将 ServerSocket 注册到 Selector 以接收连接
    serverChannel.register(selector, SelectionKey.OP_ACCEPT);
    final ByteBuffer msg = ByteBuffer.wrap("Hi!\r\n".getBytes());
    for (; ; ) {
        try {
            /// 等到需要处理的新事件；阻塞将一直持续到下一个传入事件
            selector.select();
        } catch (IOException ex) {
            ex.printStackTrace();
            // handle exception
            break;
        }
        // 获取所有接收事件的 Selection-Key 实例
        Set<SelectionKey> readyKeys = selector.selectedKeys();
        Iterator<SelectionKey> iterator = readyKeys.iterator();
        while (iterator.hasNext()) {
            SelectionKey key = iterator.next();
            iterator.remove();
            try {
                // 检查事件是否是一个新的已经就绪可以被接受的连接
                if (key.isAcceptable()) {
                    ServerSocketChannel server = (ServerSocketChannel) key.channel();
                    SocketChannel client = server.accept();
                    client.configureBlocking(false);
                    // 接受客户端，并将它注册到选择器
                    client.register(selector, SelectionKey.OP_WRITE | SelectionKey.OP_READ, msg.duplicate());
                    System.out.println("Accepted connection from " + client);
                }
                // 检查套接字是否已经准备好写数据
                if (key.isWritable()) {
                    SocketChannel client = (SocketChannel) key.channel();
                    ByteBuffer buffer = (ByteBuffer) key.attachment();
                    while (buffer.hasRemaining()) {
                        // 将数据写到已连接的客户端
                        if (client.write(buffer) == 0) {
                            break;
                        }
                    }
                    // 关闭连接
                    client.close();
                }
            } catch (IOException ex) {
                key.cancel();
                try {
                    key.channel().close();
                } catch (IOException cex) {
                // ignore on close
                }
            }
        }
    }
}

Example 78 with Selector

use of java.nio.channels.Selector in project opennms by OpenNMS.

the class ConnectionTrackerTest method test.

@Test
@Ignore
public void test() throws IOException {
    Selector selector = Selector.open();
    assertTrue(selector.isOpen());
    selector.close();
    assertFalse(selector.isOpen());
    DatagramChannel c = DatagramChannel.open();
    DatagramSocket s = c.socket();
    s.setSoTimeout(1000);
    byte[] buf = new byte[1024];
    DatagramPacket p = new DatagramPacket(buf, 1024, InetAddress.getLocalHost(), 7);
    s.send(p);
}

Example 79 with Selector

use of java.nio.channels.Selector in project robovm by robovm.

the class SelectorTest method testInterrupted.

// http://code.google.com/p/android/issues/detail?id=15388
public void testInterrupted() throws IOException {
    Selector selector = Selector.open();
    try {
        Thread.currentThread().interrupt();
        int count = selector.select();
        assertEquals(0, count);
    } finally {
        selector.close();
        // RoboVM note: Clear this thread's interrupted flag. Other tests may fail if we don't.
        Thread.interrupted();
    }
}

Example 80 with Selector

use of java.nio.channels.Selector in project robovm by robovm.

the class SelectorTest method testManyWakeupCallsTriggerOnlyOneWakeup.

public void testManyWakeupCallsTriggerOnlyOneWakeup() throws Exception {
    final Selector selector = Selector.open();
    try {
        selector.wakeup();
        selector.wakeup();
        selector.wakeup();
        selector.select();
        // create a latch that will reach 0 when select returns
        final CountDownLatch selectReturned = new CountDownLatch(1);
        Thread thread = new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    selector.select();
                    selectReturned.countDown();
                } catch (IOException ignored) {
                }
            }
        });
        thread.start();
        // select doesn't ever return, so await() times out and returns false
        assertFalse(selectReturned.await(2, TimeUnit.SECONDS));
    } finally {
        selector.close();
    }
}