<snip>
I chose to implement this "unique" number is as follows:
1. Split a timestamp (long) into two int's.
2. Increment a sequence counter (int).
3. Use the java.util.zip.CRC32 class to generate a CRC value for
these 3 integer values.
4. Return this value.
<snip>
Isn't a crc32 32 bits? If so, the risk of getting two identical
id's is much to high (for two random 32 bit numbers there is a
1/65536 chance of them being equal). Even if the crc32 result is
a full long, the 64 bits may still not be enough if you generate
very large numbers of id's.
I suggest you use java.security.MessageDigest instead, e.g. md5
generates a 128 bit hash.
_
Mats Lofkvist
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