Terracotta Discussion Forums

Hi All,

Does ehcache supports following scenario.

I need to generate a sequence number every time I get a request. The new sequence number should be incremented by 1 every time. So, I can store a initial number in the ehcache. Every time I get a request, I read this value and increment by 1 and put back in cache.

If the system crashes abruptly during this process after I served few request, on restart of the cache service, can I get the last generated sequence number using ehcache? So that I can guarantee that I will not generate the old sequence numbers. I want to make sure that every time I generate I need to get a unique number.

Please confirm.

Thanks,
Chinna

In clustered it does now. In standalone it will in the summer release. Just curious whether this needs to be monotonic or if you just need guaranteed no dups. You may want to batch for efficiency.

Cheers,
Steve

Thanks Steve,

My requirement is to generate a sequence id for every transaction in multi-node environement. Currently we are using db based sequence generator which hits db everytime and causing performance issue. So, now I want to rely on inmemory with no data lost.

Thanks,
Chinna

Thats where Terracotta toolkit helps. Simply use the Atomic long feature and increment it.