SHAREPOINT 2013 APP MODEL

SHAREPOINT 2013 APP MODEL

SharePoint 2013 introduces a new mechanism for custom code deployment known as “Apps”. A SharePoint App is a solution that can only include HTML, CSS, JavaScript, Silverlight XAP files, images, and any other static files.

Why Apps are needed?

• Previously in SharePoint 2010, there have been some issues with fully trusted applications. Some solutions which is not well developed caused damage to whole farm.
• Migration to new version was difficult.
• Solution packages were required to deploy farm solutions.
• There were lots of issues with sandbox solution because of his limitations.
• New Pattern: No server-side code on the SharePoint Server
• SharePoint 2013 apps do not live in SharePoint server, rather they are executing within the browser client or in a non-SharePoint server such as IIS or Windows Azure. Apps are granted permissions to SharePoint via OAuth protocol, and communicate with SharePoint via REST APIs or Client side object model.
• There are three primary ways in which code can be deployed on-premise in SharePoint 2013: Traditional Full-trust or Sandbox or App Model
  SharePoint 2013 App Model Highlights:
  •  Apps are nothing but a self-contained piece of functionality which extends the capability of SharePoint.
  •  Custom code executes in the client, cloud or on-premise
  • Communication of apps with SharePoint happens via  REST / CSOM
  • Acquire apps via centralized Marketplace, Corporate Marketplace, Public Marketplace via submission process
  •  APIs for manual deployment
  • SharePoint hosted Apps are definitely a preferred way but they are not a replacement to sandboxed solutions
  • Everything in a SharePoint site is nothing but an app: Travel request, Contact form,  Shared Documents library, Contacts list
  Benefits:
  •  No custom code on the SharePoint server
  • Easier to upgrade to future versions of SharePoint
  • Works in hosted environments without limitations
  • Reduces the ramp-up time for those building apps
  • Leverage hosting platform features in new apps
  • Enables taking SharePoint apps to different levels further than what can be done with farm / sandbox solutions
  • Isolation – private vs. public clouds