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

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);
      }
  }