Search for a Criteria in cache

Question

My task is to maintain an aggregation of many endpoint-contributions in cache, but the challenge is to subtract the value for devices that stop communication.
There are 2 classes in the model:
class Group
string Key { get; set; }
long Total { get; set; }
class Machine
string Key { get; set; }
int Contribution { get; set; }
We have a Simple Web.Api, where the endpoints post a "contribution".
The controller invokes to the group cache "Increment" and also saves in cache the machine last contribution with a TimeToLive = 30 seconds
The goal was to register a notification for RemoveItem and when the object duration expires, subtract the value to the Group totalizer.
But there are 2 problems:
The notifications only invoke the callback every 5 minutes (can't go faster no matter what I use for TTL or the pollInterval on the cache client)
The callback returns the "keys" not the objects, therefore I know what object was removed but I don't know the contribution.
Q1) MSFT experts, could you assert if registering a callback can trigger as fast as 30 seconds?
Q2) Can Anyone suggest how to bring from cache "only the expired" records? In other words can I write a filter to query cache based on a particular attribute:
Next a hypothetical example where I am using a TSQL query, but it can be LINQ, or anything to filter
var machines = _cache.Get<Machine>("Select * where DateDiff(LastUpdate, Now) > 30_SEC");

Answer 1

Hello,
Thanks for posting!
Base on my experience, you could set the "pollInterval" or "ttlvalue" value in your cache node. By default, polling interval is every 300 seconds. So you may need to wait 5 minutes. I recommend you could refer to this page(http://msdn.microsoft.com/en-us/library/windowsazure/dn386128.aspx
) about Notification part . And you could refer to how to configure its value, please see this page (
http://msdn.microsoft.com/en-us/library/windowsazure/hh916611.aspx ).
Please try it.
Regards,
Will
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