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OutputCache in Windows Azure folosind AppFabric.Cache

In post-ul anterior am vorbit despre cum putem sa ne definim propriul nostru mecanism de cache-ing. Dar daca ne aflam in cloud.
Iata urmatorul scenariu: avem o aplicatie MVC 2 pe Windows Azure si vrem sa putem folosii un mecanism de cache-ing. In cazul in care avem mai multe web roluri dorim sa facem un sistem de cache-ing oarecum centralizat. Nu dorim sa încărcam de doua ori anumite date daca acestea sunt deja incarcate.
O varianta pentru a rezolva aceasta problema este sa ne definim propriul mecanism pentru cache-ing. Nu ar fi foarte complicat, dar ne-ar costa ceva timp. Cea mai simpla varianta este sa folosim mecanismul intern de pe Windows Azure. AppFabric ne ofera si posibilitatea sa facem cache-ing la date. Acest provider de cache-ing se numeste DistributedCache, iar pentru al putea folosi este nevoie sa accesam sectiunea de AppFabric din contul de Windows Azure si sa adaugăm un serviciu.
In web.config-ul aplicatiei trebuie sa adauga o noua sectiune prin care sa putem definii providerul din cloud, iar apoi sa scriem definiția propriu-zisa:
<configSections>
<section name="distributedCache"
type="Microsoft.ApplicationServer.Caching.DataCacheClientSection,
Microsoft.ApplicationServer.Caching.Core"
allowLocation="true" allowDefinition="Everywhere"/>
</configSections>
<distributedCache deployment="Simple">
<hosts>
<host name="raduVunvulea.cache.appfabriclabs.com" cachePort="80" />
</hosts>
<securityProperties mode="Message">
<messageSecurity authorizationInfo="43423423DFJF2rf32f23f23f233gt23f3f3">
</messageSecurity>
</securityProperties>
</distributedCache>
Tot ce mai este nevoie este sa adaugam in sectiunea de cache-ing definitia noastra de provider:
<webconfig>
<caching>
<outputCache defaultProvider="DistributedCacheProvider" >
<add name="DistributedCacheProvider"
type="Microsoft.Web.DistributedCache.DistributedCacheOutputCacheProvider,
Microsoft.Web.DistributedCache"
cacheName="cacheOne" />
</outputCache>
</caching>
</webconfig>
Din acest moment aplicatia noastra o sa poata folosi cache-ing pe care Windows Azure il pune la dispozitie prin intermediul AppFabric. Pentru acest lucru aveti nevoie nu doar de un cont de Windows Azure ci si de un service namespace pe AppFabric, care nu este gratis.

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