ServerSocketChannelClassUtil.java 文件源码

/**
 * Returns a server socket channel class suitable for specified event loop group.
 *
 * @param eventLoopGroup the event loop group for which to identify an appropriate socket channel class; must not
 * be {@code null}
 *
 * @return a server socket channel class suitable for use with the given event loop group
 *
 * @throws IllegalArgumentException in case of null or unrecognized event loop group
 */
@SuppressWarnings("unchecked")
static Class<? extends ServerChannel> getServerSocketChannelClass(final EventLoopGroup eventLoopGroup) {
    Objects.requireNonNull(eventLoopGroup);

    final Class<? extends ServerChannel> serverSocketChannelClass;

    if (eventLoopGroup instanceof NioEventLoopGroup) {
        serverSocketChannelClass = NioServerSocketChannel.class;
    } else if (eventLoopGroup instanceof OioEventLoopGroup) {
        serverSocketChannelClass = OioServerSocketChannel.class;
    } else if (EPOLL_EVENT_LOOP_GROUP_CLASS.equals(eventLoopGroup.getClass().getName())) {
        serverSocketChannelClass = (Class<? extends ServerChannel>) loadSocketChannelClass(EPOLL_SERVER_SOCKET_CHANNEL_CLASS);
    } else if (KQUEUE_EVENT_LOOP_GROUP_CLASS.equals(eventLoopGroup.getClass().getName())) {
        serverSocketChannelClass = (Class<? extends ServerChannel>) loadSocketChannelClass(KQUEUE_SERVER_SOCKET_CHANNEL_CLASS);
    } else {
        throw new IllegalArgumentException("Could not find server socket class for event loop group class: " + eventLoopGroup.getClass().getName());
    }

    return serverSocketChannelClass;
}