CepStream.SnapshotWindow<TPayload> Method (CepStream<TPayload>, SnapshotWindowOutputPolicy)
Transforms a stream to a window stream where each member is a CepWindow. Each window is a snapshot window that is defined by the closest event endpoints in the stream.
Namespace: Microsoft.ComplexEventProcessing.Linq
Assembly: Microsoft.ComplexEventProcessing (in Microsoft.ComplexEventProcessing.dll)
Syntax
public static CepWindowStream<CepWindow<TPayload>> SnapshotWindow<TPayload>(
this CepStream<TPayload> source,
SnapshotWindowOutputPolicy outputPolicy
)
Type Parameters
- TPayload
Type of the input event payload.
Parameters
- source
Type: Microsoft.ComplexEventProcessing.Linq.CepStream<TPayload>
CepStream to apply the Snapshot operation against.
- outputPolicy
Type: Microsoft.ComplexEventProcessing.Linq.SnapshotWindowOutputPolicy
Indicate how the output events of the window operation are altered they are introduced back into the stream.
Return Value
Type: Microsoft.ComplexEventProcessing.Linq.CepWindowStream<CepWindow<TPayload>>
A window stream to which aggregates, ranking or user-defined operations can be applied.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type CepStream<TPayload>. When you use instance method syntax to call this method, omit the first parameter. For more information, see https://msdn.microsoft.com/en-us/library/bb384936(v=sql.105) or https://msdn.microsoft.com/en-us/library/bb383977(v=sql.105).
Remarks
For more information, see Using Event Windows and Snapshot Windows.
Examples
var snapshotAgg = from w in inputStream.SnapshotWindow(SnapshotWindowOutputPolicy.Clip)
select new { sum = w.Sum(e => e.i) };