NioUtils.java 文件源码

/**
 * Sets the supplied option on the channel to have the value if option is a member of
 * allowedOptions.
 *
 * @throws IOException
 *          if the value could not be set due to IO errors.
 * @throws IllegalArgumentException
 *          if the socket option or the value is invalid.
 * @throws UnsupportedOperationException
 *          if the option is not a member of allowedOptions.
 * @throws ClosedChannelException
 *          if the channel is closed
 */
public static <T> void setSocketOption(
        FileDescriptorChannel channel, Set<SocketOption<?>> allowedOptions,
        SocketOption<T> option, T value)
        throws IOException {

    if (!(option instanceof StandardSocketOptions.SocketOptionImpl)) {
        throw new IllegalArgumentException("SocketOption must come from StandardSocketOptions");
    }
    if (!allowedOptions.contains(option)) {
        throw new UnsupportedOperationException(
                option + " is not supported for this type of socket");
    }
    if (!channel.getFD().valid()) {
        throw new ClosedChannelException();
    }
    ((StandardSocketOptions.SocketOptionImpl<T>) option).setValue(channel.getFD(), value);
}