case HEADERCRC:
long headerCrc = writableEvent.headerCrc() ^ CORRUPTION_PATTERN;
writableEvent.setHeaderCrc(headerCrc);
break;
case PAYLOAD:
if (writableEvent.payloadLength() > 0)
{
byte[] payload = new byte[writableEvent.payloadLength()];
writableEvent.value().get(payload);
payload[0] ^= CORRUPTION_PATTERN;
writableEvent.setValue(payload);