clear SocketChannel Selection Key - Java java.nio.channels

Java examples for java.nio.channels:SocketChannel

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Description

clear SocketChannel Selection Key

Demo Code


import java.net.Socket;
import java.nio.channels.SelectionKey;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import org.apache.log4j.Logger;

public class Main{
    private final static Logger logger = Logger
            .getLogger(SocketChannelUtil.class);
    public static boolean clearSelectionKey(SelectionKey selectionKey) {
        try {/*from   ww w.j  a v a 2s  . c  o  m*/
            if (selectionKey != null && selectionKey.isValid()) {
                try {
                    if (ServerSocketChannel.class
                            .isAssignableFrom(selectionKey.channel()
                                    .getClass())) {
                        logger.debug("ServerSocketChannel closing");
                        closeServerSocketChannel((ServerSocketChannel) selectionKey
                                .channel());
                    } else {
                        closeSocketChannel((SocketChannel) selectionKey
                                .channel());
                    }
                } finally {
                    try {
                        selectionKey.cancel();
                    } catch (Throwable e) {
                        logger.error("clearSelectionKey()", e);
                    }
                }

                return true;
            } else {
                return false;
            }
        } catch (Throwable e) {
            logger.error("clearSelectionKey()", e);
            return false;
        }
    }
    protected static void closeServerSocketChannel(
            ServerSocketChannel socketChannel) {
        try {
            if (!socketChannel.socket().isClosed()) {
                socketChannel.socket().close();
            }
        } catch (Throwable e) {
            logger.error(null, e);
        }

        try {
            socketChannel.close();
        } catch (Throwable e) {
            logger.error(null, e);
        }
    }
    protected static void closeSocketChannel(SocketChannel socketChannel) {
        try {
            if (!socketChannel.socket().isInputShutdown()) {
                socketChannel.socket().shutdownInput();
            }
        } catch (Throwable e) {
            //logger.info(e);
        }

        try {
            if (!socketChannel.socket().isOutputShutdown()) {
                socketChannel.socket().shutdownOutput();
            }
        } catch (Throwable e) {
            //mostly client disconnected
            //logger.error(null, e);
        }

        try {
            if (!socketChannel.socket().isClosed()) {
                socketChannel.socket().close();
            }
        } catch (Throwable e) {
            logger.error(null, e);
        }

        try {
            socketChannel.close();
        } catch (Throwable e) {
            logger.error(null, e);
        }

        //logger.debug("closeSocketChannel:".concat(socketChannel.socket().getRemoteSocketAddress().toString()));
    }
}

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