CepStream Class

Provides the extension methods used for writing LINQ queries over a stream of CEP events.

Inheritance Hierarchy

System.Object
  Microsoft.ComplexEventProcessing.Linq.CepStream

Namespace:  Microsoft.ComplexEventProcessing.Linq
Assembly:  Microsoft.ComplexEventProcessing (in Microsoft.ComplexEventProcessing.dll)

Syntax

public static class CepStream

The CepStream type exposes the following members.

Methods

	Name	Description
	AlterEventDuration<TPayload>	Changes the duration of the input events. This method does not change the start time of an event.
	AlterEventLifetime<TPayload>	Alters the lifetime of the events in the stream. This method can change both the start time and end time of an event.
	ClipEventDuration<TSource, TClip>	Shortens the lifetime of events in sourceStream to the start time of the next corresponding event in clipStream matched by matchExpression.
	CountByStartTimeWindow<TPayload>(CepStream<TPayload>, UInt32)	Groups input stream events into windows of events based on a given number of unique event start times using the default output policy. The window slides when a new event arrives that starts at a different time.
	CountByStartTimeWindow<TPayload>(CepStream<TPayload>, UInt32, CountWindowOutputPolicy)	Groups input stream events into windows of events based on a given number of unique event start times. The window slides when a new event arrives that starts at a different time.
	CountByStartTimeWindow<TPayload>(CepStream<TPayload>, UInt32, WindowInputPolicy, CountWindowOutputPolicy)	Groups input stream events into windows of events based on a given number of unique event start times. The window slides when a new event arrives that starts at a different time.
	GroupBy<TPayload, TGroupingKey>(CepStream<TPayload>, Expression<Func<TPayload, TGroupingKey>>)	Partitions the input stream by the specified grouping key.
	GroupBy<TPayload, TGroupingKey, TResult>(CepStream<TPayload>, Expression<Func<TPayload, TGroupingKey>>, Expression<Func<TPayload, TResult>>)	Groups the source stream by the specified key selector functions and projects results using the element selector function.
	HoppingWindow<TPayload>(CepStream<TPayload>, TimeSpan, TimeSpan)	Transforms a stream to a window stream where each member is a CepWindow using the default output policy. The window is defined by the constant window size and hop size timespans.
	HoppingWindow<TPayload>(CepStream<TPayload>, TimeSpan, TimeSpan, HoppingWindowOutputPolicy)	Transforms a stream to a window stream where each member is a CepWindow. The window is defined by the constant window size and hop size timespans.
	HoppingWindow<TPayload>(CepStream<TPayload>, TimeSpan, TimeSpan, DateTime)	Transforms a stream to a window stream where each member is a CepWindow using the default output policy. The window is defined by constant window size and hop size timespans. You can also provide an alignment time as a reference for the starting point for the window.
	HoppingWindow<TPayload>(CepStream<TPayload>, TimeSpan, TimeSpan, WindowInputPolicy, HoppingWindowOutputPolicy)	Transforms a stream to a window stream where each member is a CepWindow. The window is defined by the constant window size and hop size timespans. You can also provide an alignment time as a reference for the starting point for the window.
	HoppingWindow<TPayload>(CepStream<TPayload>, TimeSpan, TimeSpan, DateTime, HoppingWindowOutputPolicy)	Transforms a stream to a window stream where each member is a CepWindow. The window is defined by constant window size and hop size timespans. You can also provide an alignment time as a reference for the starting point for the window.
	HoppingWindow<TPayload>(CepStream<TPayload>, TimeSpan, TimeSpan, DateTime, WindowInputPolicy, HoppingWindowOutputPolicy)	The window is defined by constant window size and hop size timespans. You can also provide an alignment time as a reference for the starting point of the window.
	IsEmpty<TPayload>	Function used in queries to indicate a left anti-semi-join (LASJ).
	Join<TOuter, TInner, TKey, TResult>	Joins the events from the outer stream with events from the inner stream on the given join key.
	OrderBy<TPayload, TOrderKey>	Orders the input stream by the rankSelector.
	OrderByDescending<TPayload, TOrderKey>	Orders the input stream by the rankSelector in descending order.
	Scan<TInputEvent, TInputPayload, TOutputPayload>	Scans an input stream using a user-defined stream operator.
	Select<TInput, TResult>(CepOrderedStream<TInput>, Expression<Func<TInput, TResult>>)	Given an ordered stream, this method produces an ordered stream that can be used for ranking.
	Select<TPayload, TResult>(CepStream<TPayload>, Expression<Func<TPayload, TResult>>)	Projects events from input stream using a projections expression.
	Select<TInput, TResult>(CepWindowStream<CepWindow<TInput>>, Expression<Func<CepWindow<TInput>, TResult>>)	Maps a window stream to a stream based on a given mapping expression.
	Select<TInput, TOutput>(ICepEnumerable<TInput>, Expression<Func<TInput, TOutput>>)	Projects each event of an enumerable input stream into a new event.
	SelectMany<TInput, TResult>(CepWindowStream<CepWindow<TInput>>, Expression<Func<CepWindow<TInput>, CepWindow<TInput>>>, Expression<Func<CepWindow<TInput>, TInput, TResult>>)	Supports order by operation against a windowed stream.
	SelectMany<TInput, TBind, TResult>(CepStream<TInput>, Expression<Func<CepStream<TInput>, CepStream<TBind>>>, Expression<Func<TInput, TBind, TResult>>)	Produces a stream based on the cross join of two input streams.
	SelectMany<TInput, TGroupingKey, TBind, TResult>(CepGroupingStreams<TInput, TGroupingKey>, Expression<Func<CepStream<TInput>, CepStream<TBind>>>, Expression<Func<IKey<TGroupingKey>, TBind, TResult>>)	Supports adding query logic inside a Group and Apply.
	SelectMany<TInput, TGroupingKey, TBind, TResult>(CepGroupingStreams<TInput, TGroupingKey>, Expression<Func<CepStream<TInput>, CepWindowStream<TBind>>>, Expression<Func<IKey<TGroupingKey>, TBind, TResult>>)	Produces a stream based on the cross join of two input streams.
	ShiftEventTime<TPayload>(CepStream<TPayload>, Expression<Func<CepEvent, DateTime>>)	Shifts the event start time to a new time stamp without changing the lifetime.
	ShiftEventTime<TPayload>(CepStream<TPayload>, Expression<Func<CepEvent, TimeSpan>>)	Shifts the event start time by the specified timespan without changing the lifetime.
	SnapshotWindow<TPayload>(CepStream<TPayload>)	Transforms a stream to a window stream where each member is a CepWindow using the default output policy. Each window is a snapshot window that is defined by the closest event endpoints in the stream.
	SnapshotWindow<TPayload>(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.
	SnapshotWindow<TPayload>(CepStream<TPayload>, WindowInputPolicy, 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.
	Take<TPayload>(CepOrderedStream<TPayload>, UInt32)	Given an ordered stream, takes a given number of events from each window.
	Take<TInput, TResult>(CepOrderedStream<TInput>, UInt32, Expression<Func<CepRankedEvent<TInput>, TResult>>)	Takes a given number of events from each window and also evaluates the given expression. This is used for cases in which you want to project the rank into the result of Take().
	ThenBy<TPayload, TOrderKey>	Orders an ordered stream by another orderKey as indicated by rankSelector.
	ThenByDescending<TPayload, TOrderKey>	Orders an ordered stream by another orderKey as indicated by rankSelector.
	ToEdgeEnumerable<TPayload>(CepStream<TPayload>)	Converts a CepStream of edge events to an event sink that implements the IEnumerable interface. The order of events is FullyOrdered.
	ToEdgeEnumerable<TPayload>(CepStream<TPayload>, StreamEventOrder)	Converts a CepStream of edge events with the specified event order to an event sink that implements the IEnumerable interface.
	ToEdgeStream<TInput, TPayload>	Converts an enumerable input stream to a stream of edge events, and provides the temporal characteristics of the input.
	ToEnumerable<TPayload>(CepStream<TPayload>)	Converts a stream of events to enumerable output by removing event headers and discarding CTI events.
	ToEnumerable<TPayload>(CepStream<TPayload>, StreamEventOrder)	Converts a stream of events to enumerable output with the specified event order by removing event headers and discarding CTI events.
	ToIntervalEnumerable<TPayload>(CepStream<TPayload>)	Converts a CepStream of interval events to an event sink that implements the IEnumerable interface. The order of events is FullyOrdered.
	ToIntervalEnumerable<TPayload>(CepStream<TPayload>, StreamEventOrder)	Converts a CepStream of interval events with the specified event order to an event sink that implements the IEnumerable interface.
	ToIntervalStream<TInput, TPayload>	Converts an enumerable input stream to a stream of interval events, and provides the temporal characteristics of the input.
	ToPointEnumerable<TPayload>(CepStream<TPayload>)	Converts a CepStream of point events to an event sink that implements the IEnumerable interface. The order of events is FullyOrdered.
	ToPointEnumerable<TPayload>(CepStream<TPayload>, StreamEventOrder)	Converts a CepStream of point events with the specified event order to an event sink that implements the IEnumerable interface.
	ToPointEventStream<TPayload>	Changes the events in an input stream to point events by keeping only the event start times.
	ToPointStream<TInput, TPayload>
	ToStream<TPayload>(IEnumerable<EdgeEvent<TPayload>>, Application, AdvanceTimeSettings, String)
	ToStream<TPayload>(IEnumerable<IntervalEvent<TPayload>>, Application, AdvanceTimeSettings, String)
	ToStream<TPayload>(IEnumerable<PointEvent<TPayload>>, Application, AdvanceTimeSettings, String)
	TumblingWindow<TPayload>(CepStream<TPayload>, TimeSpan)	Transforms a stream to a window stream where each member is a CepWindow using the default output policy. A tumbling window is a special kind of hopping window where window size and hop size are the same.
	TumblingWindow<TPayload>(CepStream<TPayload>, TimeSpan, HoppingWindowOutputPolicy)	Transforms a stream to a window stream where each member is a CepWindow. A tumbling window is a special kind of hopping window where window size and hop size are the same.
	TumblingWindow<TPayload>(CepStream<TPayload>, TimeSpan, DateTime)	Transforms a stream to a window stream where each member is a CepWindow using the default output policy. A tumbling window is a special kind of hopping window where window size and hop size are the same. You can also provide an alignment time as a reference for the starting point of the window.
	TumblingWindow<TPayload>(CepStream<TPayload>, TimeSpan, WindowInputPolicy, HoppingWindowOutputPolicy)	Transforms a stream to a window stream where each member is a CepWindow. A tumbling window is a special kind of hopping window where window size and hop size are the same. You can also provide an alignment time as a reference for the starting point of the window.
	TumblingWindow<TPayload>(CepStream<TPayload>, TimeSpan, DateTime, HoppingWindowOutputPolicy)	Transforms a stream to a window stream where each member is a CepWindow. A tumbling window is a special kind of hopping window where window size and hop size are the same. You can also provide an alignment time as a reference for the starting point of the window.
	TumblingWindow<TPayload>(CepStream<TPayload>, TimeSpan, DateTime, WindowInputPolicy, HoppingWindowOutputPolicy)	Transforms a stream to a window stream where each member is a CepWindow. A tumbling window is a special kind of hopping window where window size and hop size are the same. You can also provide an alignment time as a reference for the starting point of the window.
	Union<TPayload>	Unions two streams together into one stream.
	Where<TPayload>(CepStream<TPayload>, Expression<Func<TPayload, Boolean>>)	Filters events from an input stream using a given filter function.
	Where<TInput>(ICepEnumerable<TInput>, Expression<Func<TInput, Boolean>>)	Filters events from an enumerable input stream using the specified filter expression.

Top

Remarks

CepStream is a collection of the extension methods. In general, the extension methods return a LINQ method call expression. The method calls capture the invocation sequence in a canonical form that is later translated into a runnable CEP query.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also

Reference

Microsoft.ComplexEventProcessing.Linq Namespace