Chess MapReduce Application

Code To Investigate and Implement

ChessMapper

class:	ChessMapper.java
methods:	constructor isMoveAtIndexDesired map
package:	mapreduce.apps.chess.exercise
source folder:	student/src/main/java

constructor and instance variable

method: public ChessMapper(IntPredicate isMoveAtIndexDesired) (sequential implementation only)

Hang onto the value of the isMoveAtIndexDesired parameter as an instance variable for later use.

isMoveAtIndexDesired

This method exists largely as a reminder to use the isMoveAtIndexDesired passed to the constructor.

map

Note: the ChessMapper is constructed with an IntPredicate. This IntPredicate should be passed to each game's positionResponsePairs method to potentially limit how many pairs you will emit.

method: public List<Map.Entry<Position, MoveResultPair>> map(Game game) (sequential implementation only)

ChessReducer

class:	ChessReducer.java
methods:	reduce
package:	mapreduce.apps.chess.exercise
source folder:	student/src/main/java

reduce

method: public Map<Move, ResultTotalInfo> reduce(List<MoveResultPair> moveResultPairs) (sequential implementation only)

Warning:This class inherits from ClassicReducer. Be sure to have completed that exercise first.

Tip: You may notice that you cannot directly call the constructor for ResultTotalInfo. A ResultTotalInfo object is immutable, but a ResultTotalInfo.Builder is not. Accumulate game results into this ResultTotalInfo.Builder object, and when it is complete, call .build(), and this will return a ResutlTotalInfo object with all game results.