private static void validateSufficientSocketBufferLengths(final Context ctx) {
try (final DatagramChannel probe = DatagramChannel.open()) {
final int defaultSoSndBuf = probe.getOption(StandardSocketOptions.SO_SNDBUF);
probe.setOption(StandardSocketOptions.SO_SNDBUF, Integer.MAX_VALUE);
final int maxSoSndBuf = probe.getOption(StandardSocketOptions.SO_SNDBUF);
if (maxSoSndBuf < Configuration.SOCKET_SNDBUF_LENGTH) {
System.err.format(
"WARNING: Could not get desired SO_SNDBUF: attempted=%d, actual=%d\n",
Configuration.SOCKET_SNDBUF_LENGTH, maxSoSndBuf);
}
probe.setOption(StandardSocketOptions.SO_RCVBUF, Integer.MAX_VALUE);
final int maxSoRcvBuf = probe.getOption(StandardSocketOptions.SO_RCVBUF);
if (maxSoRcvBuf < Configuration.SOCKET_RCVBUF_LENGTH) {
System.err.format(
"WARNING: Could not get desired SO_RCVBUF: attempted=%d, actual=%d\n",
Configuration.SOCKET_RCVBUF_LENGTH, maxSoRcvBuf);
}
final int soSndBuf =
(0 == Configuration.SOCKET_SNDBUF_LENGTH)
? defaultSoSndBuf
: Configuration.SOCKET_SNDBUF_LENGTH;
if (ctx.mtuLength() > soSndBuf) {
throw new ConfigurationException(
String.format(
"MTU greater than socket SO_SNDBUF: mtuLength=%d, SO_SNDBUF=%d",
ctx.mtuLength(), soSndBuf));
}
} catch (final IOException ex) {
throw new RuntimeException(String.format("probe socket: %s", ex.toString()), ex);
}
}
