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Cum putem sincroniza un director cu un blob din cloud.

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Ieri am vorbit despre modalitatea prin care una sau mai multe instante de SQL Azure se pot sincroniza.
Astazi o sa incerc sa o ofer o solutie pentru cazul in care un client adauga in mod deconectat date pe blob, pe care noi vrem mai tarziu sa le le sincronizam cu blob-urile din cloud.
Problema: Se da un client care lucreaza cu date din blob-uri in mod deconectat. Se doreste ca la reconectare sa se sincronizeze cele doua storage-uri.
Ati spune simplu, ne apucam sa ne scriem un mecanism prin care sa putem sincroniza cele doua containere de date. Da, e si asta o varianta, dar oare merita sa implementam de la zero acest mecanism. Ati putea spune ca putem vedeam cele doua storage-uri ca si doua directoare si atunci sa folosim un mecanism de sincronizare a directoarelor. Suna bine, dar am o solutie mult mai curata - Microsoft Sync Framework.
Se bazeaza pe idea de a vedea cele doua storage-uri ca si doua directoare( partitii). Folosindu-ne de Microsoft Sync Framework putem sa sincronizam aceste date fara nici o problema.
  FileSyncProvider localfileSyncProvider = new FileSyncProvider(localPathName);
 AzureBlobSyncProvider cloudSyncProvider= new AzureBlobSyncProvider(containerName, blobStore);
  SyncOrchestrator syncOrchestrator = new SyncOrchestrator();
  syncOrchestrator.LocalProvider = localfileSyncProvider;
  syncOrchestrator.RemoteProvider = cloudSyncProvider;
  syncOrchestrator.Synchronize();
Mai sus am dat un exemplu rudimentar la modul in care se poate face o sincronizare intre un directoru local si un blob folosindu-ne de acest framework. Ce mi-a placut pana acuma este ca nu mai este nevoie sa imi bat capul cum sa detectez modificările. Exista deja implementat un mecanism pentru acest lucru, iar in cazul in care dorim unul custom, putem cu usurinta sa inseram mecanismul nostru propriu.
Zilele astea o sa studiez acest framework si o sa revin cu alte posturi. O prezentare interesanta gasiti aici: http://www.microsoftpdc.com/2009/SVC23
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