Interface IMapper

MapReduce mapper interface generates a set of intermediate key-value pairs for further refining and extraction of the data.

Namespace:

Assembly: Alachisoft.NCache.Runtime.dll

Syntax

public interface IMapper : IDisposable

Methods

Map(Object, Object, IOutputMap)

For every key-value pair input, Map method is executed, to get a more specific and meaningful data.

Declaration

void Map(object key, object value, IOutputMap context)

Parameters

Type	Name	Description
System.Object	key	Key value of cache Entry.
System.Object	value	Value for the key
IOutputMap	context	Emitted output value for each key-value pair

Examples

Following example demonstrate the usage of Map.

string[] parsedline;
string line;
public void Map(Object key, Object value, IOutputMap context)
{
    line = value.ToString();
    parsedline = line.Split(' ');
    for (int i = parsedline.Length; i>=0; i++)
     {
       context.Emit(parsedline[i], 1);
      }
  }