JobBuilderMapTInput, TOutput Method (IOperationInput, ActionTInput, RecordWriterTOutput, TaskContext, RecordReuseMode)

public StageOperation Map<TInput, TOutput>(
	IOperationInput input,
	Action<TInput, RecordWriter<TOutput>, TaskContext> mapper,
	RecordReuseMode recordReuse = RecordReuseMode.Default
)

Public Function Map(Of TInput, TOutput) ( 
	input As IOperationInput,
	mapper As Action(Of TInput, RecordWriter(Of TOutput), TaskContext),
	Optional recordReuse As RecordReuseMode = RecordReuseMode.Default
) As StageOperation

public:
generic<typename TInput, typename TOutput>
StageOperation^ Map(
	IOperationInput^ input, 
	Action<TInput, RecordWriter<TOutput>^, TaskContext^>^ mapper, 
	RecordReuseMode recordReuse = RecordReuseMode::Default
)

member Map : 
        input : IOperationInput * 
        mapper : Action<'TInput, RecordWriter<'TOutput>, TaskContext> * 
        ?recordReuse : RecordReuseMode 
(* Defaults:
        let _recordReuse = defaultArg recordReuse RecordReuseMode.Default
*)
-> StageOperation 

Parameters

input

Type: Ookii.Jumbo.Jet.Jobs.BuilderIOperationInput
The input.

mapper

Type: SystemActionTInput, RecordWriterTOutput, TaskContext
The map function.

recordReuse (Optional)

Type: Ookii.Jumbo.Jet.Jobs.BuilderRecordReuseMode
The record reuse mode.

Type Parameters

TInput

The type of the input records.

TOutput

The type of the output records.

Return Value

Note
There is no non-delegate version of this method. To use an existing map task class, simply use the Process(IOperationInput, Type) function.

This method generates a class inheriting from PushTaskTInput, TOutput which calls the target method of the mapper delegate from the ProcessRecord(TInput, RecordWriterTOutput) method.

Note
The task method will be called from a completely different process than the one that is using JobBuilder, so it should not really on any external state.

If recordReuse is Default and the target method has the AllowRecordReuseAttribute attribute applied to it, that attribute will be copied to the task class. If the target method has the ProcessAllInputPartitionsAttribute attribute applied to it, that attribute will be copied to the task class.

If the target method is a public method, it will be called directly by the generated task class. Otherwise, the supplied delegate will be serialized to the task settings and used to call the method. If the target method is an instance method, the instance it belongs to will be serialized as well (this class must have the SerializableAttribute attribute).

Reference