AsynchronousSocketChannelImpl.java 文件源码

@Override
@SuppressWarnings("unchecked")
public final <T> T getOption(SocketOption<T> name) throws IOException {
    if (name == null)
        throw new NullPointerException();
    if (!supportedOptions().contains(name))
        throw new UnsupportedOperationException("'" + name + "' not supported");

    try {
        begin();
        if (name == StandardSocketOptions.SO_REUSEADDR &&
                Net.useExclusiveBind())
        {
            // SO_REUSEADDR emulated when using exclusive bind
            return (T)Boolean.valueOf(isReuseAddress);
        }
        return (T) Net.getSocketOption(fd, Net.UNSPEC, name);
    } finally {
        end();
    }
}