Re: Need to store a hashmap in memory to keep the counters for different user

On 11/01/2011 11:50 PM, Waqas Sadiq wrote:
> Hi,
>
> I am working on storing different user counters in memory at
> application level (not database) and to have counters to atmost 3.
>
> I developed this code using a singleton class with hashmap to store a
> key value pair of user id and and it's counter and time.
>
> After initial, i was using this singleton class on client side, it
> worked fine for counters but when browser was refreshed, a new
> singleton object was created.
>
> I searched, and come to know that for security reason, javascript
> don't use shared objects, so i moved it to rpc call and make it server
> side object to overcome it, but when i tested it again, on refresh new
> object is created and data lost.

That's expected behavior. You'll want to retrieve the stored data at
application startup.

> I also tested the static hashmap to hold the data for application
> scope, but it has almost the same behavior, once refreshed the
> browser, its reset and old data is lost in it. It little different
> behavior from normal java web apps where we follow this approach.
>
> Does any one know how can i keep object at application scope in gwt ?

Can you restrict your app to browsers that support local storage?

In no way will the static storage class solve the problem you're describing.

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