class HadoopPipes::Factory

A factory to create the necessary application objects

Inheritance:

Public Methods

virtual Mapper* createMapper(MapContext& context) const = 0

virtual Reducer* createReducer(ReduceContext& context) const = 0

virtual Reducer* createCombiner(MapContext& context) const

Create a combiner, if this application has one.

virtual Partitioner* createPartitioner(MapContext& context) const

Create an application partitioner object.

virtual RecordReader* createRecordReader(MapContext& context) const

Create an application record reader.

virtual RecordWriter* createRecordWriter(ReduceContext& context) const

Create an application record writer.

virtual ~Factory()

Documentation

A factory to create the necessary application objects

virtual Mapper* createMapper(MapContext& context) const = 0

virtual Reducer* createReducer(ReduceContext& context) const = 0

virtual Reducer* createCombiner(MapContext& context) const

Create a combiner, if this application has one.

Returns:

the new combiner or NULL, if one is not needed

virtual Partitioner* createPartitioner(MapContext& context) const

Create an application partitioner object.

Returns:

the new partitioner or NULL, if the default partitioner should be used.

virtual RecordReader* createRecordReader(MapContext& context) const

Create an application record reader.

Returns:

the new RecordReader or NULL, if the Java RecordReader should be used.

virtual RecordWriter* createRecordWriter(ReduceContext& context) const

Create an application record writer.

Returns:

the new RecordWriter or NULL, if the Java RecordWriter should be used.

virtual ~Factory()

Direct child classes:

TemplateFactory2

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