SPWorkItemJobDefinition – a different kind of SharePoint Timer Job

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I recently learnt about a new (well new to me at any rate) type of SharePoint timer job. Rather than the standard timer jobs I normally create that inherit from SPJobDefinition, this different kind of timer job inherits from SPWorkItemJobDefinition http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.administration.spworkitemjobdefinition.aspx

With a normal SharePoint timer job (SPJobDefinition), the job is scheduled via an SPSchedule object, and is run whenever this schedule dictates. When an occurrence of the timer job runs, any logic that is contained in the Execute method is then called: