Java Selector.close方法代码示例

import java.nio.channels.Selector; //导入方法依赖的package包/类
public static void main(String[] args) throws Exception {
    final Selector sel = Selector.open();

    Runnable r = new Runnable() {
        public void run() {
            try {
                sel.select();
            } catch (IOException x) {
                x.printStackTrace();
            }
        }
    };

    // start thread to block in Selector
    Thread t = new Thread(r);
    t.start();

    // give thread time to start
    Thread.sleep(1000);

    // interrupt, close, and wakeup is the magic sequence to provoke the NPE
    t.interrupt();
    sel.close();
    sel.wakeup();
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
public static void main(String argv[]) throws Exception {
    int waitTime = 4000;
    Selector selector = Selector.open();
    try {
        selector.wakeup();

        long t1 = System.currentTimeMillis();
        selector.select(waitTime);
        long t2 = System.currentTimeMillis();
        long totalTime = t2 - t1;

        if (totalTime > waitTime)
            throw new RuntimeException("Test failed");
    } finally {
        selector.close();
    }
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
public void put(Selector s) throws IOException {
    if ( SHARED ) return;
    if ( enabled ) active.decrementAndGet();
    if ( enabled && (maxSpareSelectors==-1 || spare.get() < Math.min(maxSpareSelectors,maxSelectors)) ) {
        spare.incrementAndGet();
        selectors.offer(s);
    }
    else s.close();
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
public void close() throws IOException {
    enabled = false;
    Selector s;
    while ( (s = selectors.poll()) != null ) s.close();
    spare.set(0);
    active.set(0);
    if (blockingSelector!=null) {
        blockingSelector.close();
    }
    if ( SHARED && getSharedSelector()!=null ) {
        getSharedSelector().close();
        SHARED_SELECTOR = null;
    }
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
public static void main(String[] args) throws Exception {
    final Selector sel = Selector.open();

    Runnable r = new Runnable() {
        public void run() {
            try {
                sel.select();
            } catch (IOException x) {
                x.printStackTrace();
            } catch (ClosedSelectorException y) {
                System.err.println
                    ("Caught expected ClosedSelectorException");
            }
        }
    };

    // start thread to block in Selector
    Thread t = new Thread(r);
    t.start();

    // give thread time to start
    Thread.sleep(1000);

    // interrupt, close, and wakeup is the magic sequence to provoke the NPE
    t.interrupt();
    sel.close();
    sel.wakeup();
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
public void put(Selector s) throws IOException {
	if (SHARED)
		return;
	if (enabled)
		active.decrementAndGet();
	if (enabled && (maxSpareSelectors == -1 || spare.get() < Math.min(maxSpareSelectors, maxSelectors))) {
		spare.incrementAndGet();
		selectors.offer(s);
	} else
		s.close();
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
public void close() throws IOException {
	enabled = false;
	Selector s;
	while ((s = selectors.poll()) != null)
		s.close();
	spare.set(0);
	active.set(0);
	if (blockingSelector != null) {
		blockingSelector.close();
	}
	if (SHARED && getSharedSelector() != null) {
		getSharedSelector().close();
		SHARED_SELECTOR = null;
	}
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
public static void main(String args[]) throws Exception {
    String msg = "HELLO";

    // Launch the service with arguments to tell it to close
    // the connection after reading 5 bytes ("HELLO"). After
    // closing the connection the service should hang around
    // for 15 seconds.

    String service_args[] = new String[2];
    service_args[0] = String.valueOf(msg.length());
    service_args[1] = String.valueOf( 15*1000 );


    SocketChannel sc = Launcher.launchWithSocketChannel("EchoService", service_args);

    // send message - service will echo the message and close the connection.

    sc.write(ByteBuffer.wrap(msg.getBytes("UTF-8")));

    // read the reply (with timeout)
    ByteBuffer bb = ByteBuffer.allocateDirect(50);
    sc.configureBlocking(false);
    Selector sel = sc.provider().openSelector();
    SelectionKey sk = sc.register(sel, SelectionKey.OP_READ);

    long to = 12 * 1000;
    for (;;) {
        long st = System.currentTimeMillis();
        sel.select(to);
        if (sk.isReadable()) {
            int n = sc.read(bb);

            // EOF
            if (n < 0) {
                break;
            }
        }
        sel.selectedKeys().remove(sk);
        to -= System.currentTimeMillis() - st;
        if (to <= 0) {
            throw new RuntimeException("Timed out waiting for connection to close");
        }
    }
    sel.close();
    sc.close();

    // finally check that the reply length is okay
    bb.flip();
    if (bb.remaining() < msg.length()) {
        throw new RuntimeException("Premature EOF from echo service");
    }

    System.out.println("Test passed - service closed connection.");
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
private static boolean test(final long timeout)
    throws InterruptedException, IOException {
    AtomicReference<Exception> theException =
        new AtomicReference<>();
    AtomicBoolean isTimedOut = new AtomicBoolean();

    Selector selector = Selector.open();

    Thread t = new Thread(() -> {
        try {
            selector.select(timeout);
            isTimedOut.set(true);
        } catch (IOException ioe) {
            theException.set(ioe);
        }
    });
    t.start();

    t.join(SLEEP_MILLIS);

    boolean result;
    if (theException.get() == null) {
        if (timeout > SLEEP_MILLIS && isTimedOut.get()) {
            System.err.printf("Test timed out early with timeout %d%n",
                timeout);
            result = false;
        } else {
            System.out.printf("Test succeeded with timeout %d%n", timeout);
            result = true;
        }
    } else {
        System.err.printf("Test failed with timeout %d%n", timeout);
        theException.get().printStackTrace();
        result = false;
    }

    t.interrupt();
    selector.close();

    return result;
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
/**
 * Closes a <code>Selector</code> unconditionally.
 * <p>
 * Equivalent to {@link Selector#close()}, except any exceptions will be ignored. This is typically used in finally
 * blocks.
 * <p>
 * Example code:
 * <p>
 * <pre>
 * Selector selector = null;
 * try {
 * 	selector = Selector.open();
 * 	// process socket
 *
 * } catch (Exception e) {
 * 	// error handling
 * } finally {
 * 	IOUtils.closeQuietly(selector);
 * }
 * </pre>
 *
 * @param selector the Selector to close, may be null or already closed
 * @since 2.2
 */
public static void closeQuietly(final Selector selector) {
    if (selector != null) {
        try {
            selector.close();
        } catch (final IOException ioe) {
            logger.error("error close io", ioe);
        }
    }
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
/**
 * Unconditionally close a <code>Selector</code>.
 * <p/>
 * Equivalent to {@link java.nio.channels.Selector#close()}, except any exceptions will be ignored.
 * This is typically used in finally blocks.
 * <p/>
 * Example code:
 * <pre>
 *   Selector selector = null;
 *   try {
 *       selector = Selector.open();
 *       // process socket
 *
 *   } catch (Exception e) {
 *       // error handling
 *   } finally {
 *       IOUtils.closeQuietly(selector);
 *   }
 * </pre>
 *
 * @param selector the Selector to close, may be null or already closed
 * @since 2.2
 */
public static void closeQuietly(Selector selector) {
    if (selector != null) {
        try {
            selector.close();
        } catch (IOException ioe) {
            // ignored
        }
    }
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
/**
 * Unconditionally close a <code>Selector</code>.
 * <p/>
 * Equivalent to {@link Selector#close()}, except any exceptions will be ignored.
 * This is typically used in finally blocks.
 * <p/>
 * Example code:
 * <pre>
 *   Selector selector = null;
 *   try {
 *       selector = Selector.open();
 *       // process socket
 *
 *   } catch (Exception e) {
 *       // error handling
 *   } finally {
 *       IOUtils.closeQuietly(selector);
 *   }
 * </pre>
 *
 * @param selector the Selector to close, may be null or already closed
 * @since 2.2
 */
public static void closeQuietly(Selector selector) {
    if (selector != null) {
        try {
            selector.close();
        } catch (IOException ioe) {
            // ignored
        }
    }
}
 

import java.nio.channels.Selector; //导入方法依赖的package包/类
/**
 * Unconditionally close a <code>Selector</code>.
 * <p>
 * Equivalent to {@link Selector#close()}, except any exceptions will be ignored.
 * This is typically used in finally blocks.
 * <p>
 * Example code:
 * <pre>
 *   Selector selector = null;
 *   try {
 *       selector = Selector.open();
 *       // process socket
 *       
 *   } catch (Exception e) {
 *       // error handling
 *   } finally {
 *       IOUtils.closeQuietly(selector);
 *   }
 * </pre>
 *
 * @param selector the Selector to close, may be null or already closed
 * @since 2.2
 */
public static void closeQuietly(Selector selector){
    if (selector != null){
        try {
          selector.close();
        } catch (IOException ioe) {
            // ignored
        }
    }
}