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how does it work ???

Posted on 2008-10-20
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Last Modified: 2012-05-05
Hi,
   I have a situation as follows :

I have a bunch of my website settings which i named it as WebSettings (a class which holds all these settings).

I create object of this class on first call and store it in Cache object for all future uses.


Now one browser is accessing the Value of a particular setting from Cache.

Meanwhile i changed the system setting value and new browser is opened to access the setting.

My question is is there 2 different copies of Cache available for 2 browser instances or Cache would be same.
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Question by:Paramhans
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6 Comments
 
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Expert Comment

by:angus_young_acdc
ID: 22765265
From memory you would have to create two seperate caches, otherwise it will all be stored in 1 default cache where if one browser changes a value (and stores it in the cache) then the 2nd browser would read the updated value.
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Expert Comment

by:crazyman
ID: 22765357
This depends on how you are storing it, i presume your using HttpContext.Current.Cache.
What are you using as the Key ?
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Expert Comment

by:AmarIs26
ID: 22765359
Cache is global just like Application object. It is optimised for faster and safer read/write. So if you need to store something that will be used by all users then use cache. However if you need to use settings which are per user, then you should make use of the Session which is user specific.

1 Cache -> Shared by All browsers/users
1 Session -> Shared by one user/ One unique instance of the browser
1 Application -> Shared by all browsers/users
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by:johnhumenik
ID: 22773425
It might be ok to use a database table and store the settings there.  If you wanted to keep the settings the same across all instances of your application you would just load the data everytime from the database.  You could version the data or setup temp areas where settings can change on a per user basis or allow global changes.  That way you have complete control over the data and can even load that data into a memory (class / struct) as needed.  
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Author Comment

by:Paramhans
ID: 22793650
Hi thanx 4 the replies.

But to be very precise i want answer to my question.

My question is is there 2 different copies of Cache available for 2 browser instances or Cache would be same.

thanx in advance
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Accepted Solution

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AmarIs26 earned 200 total points
ID: 22794121
The httpcache would be the same for two browser instances. A unique instance is when you open ie twice from windows. If you open a new window from existing browser window then that is not unique instance.
Anyways, cache will be same for two browser in stances.
Session will be different for two browser instances.
if you still wanted to use cache then you could use the sessionid as key for your cache data
sessionID+key = keyfor cache.
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