If anyone is interested, my solution was:
> (dynamo-client/update-item cred
:table-name "atomic-counter"
:key "counter"
:attributeUpdates {:count {:value 1 :action "ADD"}})
{:consumed-capacity-units 1.0}
> (dynamo-client/get-item cred
:table-name "atomic-counter"
:key "counter")
{:item {:count "1", :id "counter"}, :consumed-capacity-units 0.5}
On Wednesday, September 17, 2014 6:44:04 PM UTC-7, ma...@datasnap.io wrote:
>
> Has anyone used Amazonica <https://github.com/mcohen01/amazonica> to
> implement an atomic counter
> <http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/WorkingWithItems.html#WorkingWithItems.AtomicCounters>
>
> in DynamoDB?
>
> I plan on having a Dynamo table with only one entry, something that looks
> like {"id": "counter", "count": 28734}, where the count acts as an atomic
> counter. Then use the update-item function to increment the count,
> regardless of it's value.
>
> I'm struggling to formulate the correct amazonica.aws.dynamodb/update-item
> function call.
>
> I have something like this currently:
>
> > (dynamo-client/put-item cred
>
> :table-name "atomic-counter"
>
> :item {:id "counter" :count 0})
>
> {:consumed-capacity-units 1.0}
>
> > (dynamo-client/get-item cred
>
> :table-name "atomic-counter"
>
> :key "counter")
>
> {:item {:count "0", :id "counter"}, :consumed-capacity-units 0.5
>
> > (dynamo-client/update-item cred
>
> :table-name "atomic-counter"
>
> :key "counter"
>
> :attributeUpdates {:count "add"})
>
> UnsupportedOperationException nth not supported on this type: Character
> clojure.lang.RT.nthFrom (RT.java:857)
>
>
> I've tried a few other variations on the value for attributeUpdates.count.
>
> Any help would be greatly appreciated!
>
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