RemotingUtil.java

/**
 * $Id: RemotingUtil.java 1831 2013-05-16 01:39:51Z shijia.wxr $
 */
package com.alibaba.rocketmq.remoting.common;

import java.io.IOException;
import java.lang.reflect.Method;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.SocketAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.nio.channels.spi.SelectorProvider;
import java.util.Enumeration;


/**
 * ������ط���
 * 
 * @author vintage.wang@gmail.com shijia.wxr@taobao.com
 */
public class RemotingUtil {
    public static final String OS_NAME = System.getProperty("os.name");

    private static boolean isLinuxPlatform = false;

    static {
        if (OS_NAME != null && OS_NAME.toLowerCase().indexOf("linux") >= 0) {
            isLinuxPlatform = true;
        }
    }


    public static boolean isLinuxPlatform() {
        return isLinuxPlatform;
    }


    public static Selector openSelector() throws IOException {
        Selector result = null;
        // ��linuxƽ̨����������epollʵ��
        if (isLinuxPlatform()) {
            try {
                final Class<?> providerClazz = Class.forName("sun.nio.ch.EPollSelectorProvider");
                if (providerClazz != null) {
                    try {
                        final Method method = providerClazz.getMethod("provider");
                        if (method != null) {
                            final SelectorProvider selectorProvider = (SelectorProvider) method.invoke(null);
                            if (selectorProvider != null) {
                                result = selectorProvider.openSelector();
                            }
                        }
                    }
                    catch (final Exception e) {
                        // ignore
                    }
                }
            }
            catch (final Exception e) {
                // ignore
            }
        }

        if (result == null) {
            result = Selector.open();
        }

        return result;
    }


    public static String getLocalAddress() {
        try {
            // ��������������һ���ǻ�·ip��ַ������
            Enumeration<NetworkInterface> enumeration = NetworkInterface.getNetworkInterfaces();
            InetAddress ipv6Address = null;
            while (enumeration.hasMoreElements()) {
                final NetworkInterface networkInterface = enumeration.nextElement();
                final Enumeration<InetAddress> en = networkInterface.getInetAddresses();
                while (en.hasMoreElements()) {
                    final InetAddress address = en.nextElement();
                    if (!address.isLoopbackAddress()) {
                        if (address instanceof Inet6Address) {
                            ipv6Address = address;
                        }
                        else {
                            // ����ʹ��ipv4
                            return normalizeHostAddress(address);
                        }
                    }
                }
            }
            // û��ipv4����ʹ��ipv6
            if (ipv6Address != null) {
                return normalizeHostAddress(ipv6Address);
            }
            final InetAddress localHost = InetAddress.getLocalHost();
            return normalizeHostAddress(localHost);
        }
        catch (SocketException e) {
            e.printStackTrace();
        }
        catch (UnknownHostException e) {
            e.printStackTrace();
        }

        return null;
    }


    public static String normalizeHostAddress(final InetAddress localHost) {
        if (localHost instanceof Inet6Address) {
            return "[" + localHost.getHostAddress() + "]";
        }
        else {
            return localHost.getHostAddress();
        }
    }


    /**
     * IP:PORT
     */
    public static SocketAddress string2SocketAddress(final String addr) {
        String[] s = addr.split(":");
        InetSocketAddress isa = new InetSocketAddress(s[0], Integer.valueOf(s[1]));
        return isa;
    }


    public static String socketAddress2String(final SocketAddress addr) {
        StringBuilder sb = new StringBuilder();
        InetSocketAddress inetSocketAddress = (InetSocketAddress) addr;
        sb.append(inetSocketAddress.getAddress().getHostAddress());
        sb.append(":");
        sb.append(inetSocketAddress.getPort());
        return sb.toString();
    }


    public static SocketChannel connect(SocketAddress remote) {
        return connect(remote, 1000 * 5);
    }


    public static SocketChannel connect(SocketAddress remote, final int timeoutMillis) {
        SocketChannel sc = null;
        try {
            sc = SocketChannel.open();
            sc.configureBlocking(true);
            sc.socket().setSoLinger(false, -1);
            sc.socket().setTcpNoDelay(true);
            sc.socket().setReceiveBufferSize(1024 * 64);
            sc.socket().setSendBufferSize(1024 * 64);
            sc.socket().connect(remote, timeoutMillis);
            sc.configureBlocking(false);
            return sc;
        }
        catch (Exception e) {
            if (sc != null) {
                try {
                    sc.close();
                }
                catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }

        return null;
    }
}