I have a system which has variable length TCPIP messages where first 2 bytes
suggest the length of the message including the header. So, a full_message =
header(i.e.,total_length) + payload
Full_Message=17AAABBCCCCDDEFGH where
Header(total_length)=2(header)+15(payload)
I tried using Apache Mina’s using PrefixedStringDecoder and
PrefixedStringCodecFactory but here in the header indicates the full length
of the message but for this message, it was different header-2.
So I am using CumulativeProtocolDecoder and decoding a small message works
fine but for a very large message seems it goes into a loop. Here is the
sample code snippet that I am using for it.
class MyDecoder extends CumulativeProtocolDecoder {
private String encoding = “UTF-8”;
public MyDecoder (String encoding) {
this.encoding = encoding;
}
protected boolean doDecode(IoSession session, IoBuffer in,
ProtocolDecoderOutput out) throws Exception {
int start = in.position();
int messagelength = in.getShort() - 2;
if (0 < in.remaining() && in.remaining() <= messagelength) {
byte[] buf = new byte[in.remaining()];
in.get(buf);
out.write(new String(buf, encoding));
return true;
} else {
return false;
}
}
}
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