Interface ICombiner

Assembly: Alachisoft.NCache.Runtime.dll
Syntax
[Obsolete("This feature is not in active development and may be removed in a future update.")]
public interface ICombiner : IDisposable

Methods

BeginCombine()

This method will provide the user with a starting point to initialize any parameters you want to be used before the actual combining of elements begins.

Declaration
void BeginCombine()
Examples

Following code demonstrates implementation of BeginCombine method. 

int count;
public void BeginCombine()
{
   count = 0;
}

Combine(Object)

This method reduces the task result locally in chunks so that the Reducer is not burdened with excessive processing. If the workflow diagram is referred, it means that the elements with the same keys are grouped together before being sent to the Reducer for counting the word occurrence.

Declaration
void Combine(object value)
Parameters
Type Name Description
System.Object value

Value for making grouped data for reducer.
Examples

Following example demonstrates how to implement Combine.

public void Combine(object value)
{
   count += int.Parse(value.ToString());
}

FinishChunk()

This method marks the end of the Combiner functionality as when the number of combined results reaches the specified chunk size, it sends the tasks in the form of a chunk to the Reducer and resets its internal state for the next chunk.

Declaration
object FinishChunk()
Returns
Type Description
System.Object

Sends the chunk to Reducer.
Examples

Following example demonstrates how to implement FinishChunk. 

public object FinishChunk()
{
   //finalize current chunk and re-initialize resources here
   int countToBeReturned = count;
   count = 0;
   return countToBeReturned;
}