using in-memory data-structures in GWT

[junaid]

Hi

I have a client requirement of 

not to use an RDBMS, but instead do everything using in-memory data-structures in GWT.  If the server is restarted then the application state will revert to the last state saved.

I don't have any idea of using in-memory data , I used to work with MySQL ,but not in memory

If anyone could please guide me a bit about this 

Thanks 

Junaid

[Thomas Broyer]

There are in-memory RDBMS if you want (H2 for instance).

Otherwise, "public static final" fields and synchronized() blocks all over the place (and/or using a ConcurrentMap implementation –e.g. ConcurrenthashMap– instead of a plain Map –such as HashMap–).

But, you're talking about a "last state saved", so there's some state persisted somewhere?

Anyway, that's nothing specific to GWT; you'd better ask a wider audience re. java web servers (e.g. stackoverflow)