Class Aggregation<TInput, TOutput>

Aggregates data by the given aggregation methods. The aggregate is a partial-blocking transformation - only the aggregation values are stored in separate memory objects. When all rows have been processed by the aggregation, the aggregated values are written into the output.

Inheritance
System.Object
LoggableTask
DataFlowComponent
DataFlowSource<TOutput>
DataFlowTransformation<TInput, TOutput>
Aggregation<TInput, TOutput>
Aggregation
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: ETLBox.DataFlow.Transformations
Assembly: ETLBox.dll
Syntax
public class Aggregation<TInput, TOutput> : DataFlowTransformation<TInput, TOutput>, ILoggableTask, IDataFlowLogging, IDataFlowTransformation<TInput, TOutput>, IDataFlowSource<TOutput>, IDataFlowSource, IDataFlowDestination<TInput>, IDataFlowDestination, IDataFlowComponent
Type Parameters
Name Description
TInput

Type of ingoing data.
TOutput

Type of outgoing data.
Examples
public class MyDetailValue
{
    public int DetailValue { get; set; }
}

public class MyAggRow
{
    [AggregateColumn(nameof(MyDetailValue.DetailValue), AggregationMethod.Sum)]
    public int AggValue { get; set; }
}

var source = new DbSource<MyDetailValue>("DetailValues");
var agg = new Aggregation<MyDetailValue, MyAggRow>();
var dest = new MemoryDestination<MyAggRow>();
source.LinkTo<MyAggRow>(agg).LinkTo(dest);

Constructors

Aggregation()

Declaration
public Aggregation()

Aggregation(Action<TInput, TOutput>)

Declaration
public Aggregation(Action<TInput, TOutput> aggregationAction)
Parameters
Type Name Description
System.Action<TInput, TOutput> aggregationAction

Sets the AggregationAction

Aggregation(Action<TInput, TOutput>, Func<TInput, Object>)

Declaration
public Aggregation(Action<TInput, TOutput> aggregationAction, Func<TInput, object> groupingFunc)
Parameters
Type Name Description
System.Action<TInput, TOutput> aggregationAction

Sets the AggregationAction
System.Func<TInput, System.Object> groupingFunc

Sets the GroupingFunc

Aggregation(Action<TInput, TOutput>, Func<TInput, Object>, Action<Object, TOutput>)

Declaration
public Aggregation(Action<TInput, TOutput> aggregationAction, Func<TInput, object> groupingFunc, Action<object, TOutput> storeKeyAction)
Parameters
Type Name Description
System.Action<TInput, TOutput> aggregationAction

Sets the AggregationAction
System.Func<TInput, System.Object> groupingFunc

Sets the GroupingFunc
System.Action<System.Object, TOutput> storeKeyAction

Sets the StoreKeyAction

Properties

AggregationAction

This action describes how the input data is aggregated

Declaration
public Action<TInput, TOutput> AggregationAction { get; set; }
Property Value
Type Description
System.Action<TInput, TOutput>

GroupingFunc

This Func defines how the object for grouping data is retrieved

Declaration
public Func<TInput, object> GroupingFunc { get; set; }
Property Value
Type Description
System.Func<TInput, System.Object>

SourceBlock

SourceBlock from the underlying TPL.Dataflow which is used as output buffer for the component.

Declaration
public override ISourceBlock<TOutput> SourceBlock { get; }
Property Value
Type Description
System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>
Overrides
ETLBox.DataFlow.DataFlowSource<TOutput>.SourceBlock

StoreKeyAction

This action defines how the grouping object is written back into the aggregated object

Declaration
public Action<object, TOutput> StoreKeyAction { get; set; }
Property Value
Type Description
System.Action<System.Object, TOutput>

TargetBlock

TargetBlock from the underlying TPL.Dataflow which is used as input buffer for the component.

Declaration
public override ITargetBlock<TInput> TargetBlock { get; }
Property Value
Type Description
System.Threading.Tasks.Dataflow.ITargetBlock<TInput>
Overrides
ETLBox.DataFlow.DataFlowTransformation<TInput, TOutput>.TargetBlock

TaskName

A name to identify the task or component. Every component or task comes with a default name that can be overwritten.

Declaration
public override string TaskName { get; set; }
Property Value
Type Description
System.String
Overrides

Methods

CleanUpOnFaulted(Exception)

Declaration
protected override void CleanUpOnFaulted(Exception e)
Parameters
Type Name Description
System.Exception e
Overrides

CleanUpOnSuccess()

Declaration
protected override void CleanUpOnSuccess()
Overrides

InternalInitBufferObjects()

Declaration
protected override void InternalInitBufferObjects()
Overrides

Implements