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R3704/2.3.0/hadoop-2.3.0/include/TemplateFactory.hh
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TemplateFactory.hh
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef HADOOP_PIPES_TEMPLATE_FACTORY_HH
#define HADOOP_PIPES_TEMPLATE_FACTORY_HH
namespace HadoopPipes {
template <class mapper, class reducer>
class TemplateFactory2: public Factory {
public:
Mapper* createMapper(MapContext& context) const {
return new mapper(context);
}
Reducer* createReducer(ReduceContext& context) const {
return new reducer(context);
}
};
template <class mapper, class reducer, class partitioner>
class TemplateFactory3: public TemplateFactory2<mapper,reducer> {
public:
Partitioner* createPartitioner(MapContext& context) const {
return new partitioner(context);
}
};
template <class mapper, class reducer>
class TemplateFactory3<mapper, reducer, void>
: public TemplateFactory2<mapper,reducer> {
};
template <class mapper, class reducer, class partitioner, class combiner>
class TemplateFactory4
: public TemplateFactory3<mapper,reducer,partitioner>{
public:
Reducer* createCombiner(MapContext& context) const {
return new combiner(context);
}
};
template <class mapper, class reducer, class partitioner>
class TemplateFactory4<mapper,reducer,partitioner,void>
: public TemplateFactory3<mapper,reducer,partitioner>{
};
template <class mapper, class reducer, class partitioner,
class combiner, class recordReader>
class TemplateFactory5
: public TemplateFactory4<mapper,reducer,partitioner,combiner>{
public:
RecordReader* createRecordReader(MapContext& context) const {
return new recordReader(context);
}
};
template <class mapper, class reducer, class partitioner,class combiner>
class TemplateFactory5<mapper,reducer,partitioner,combiner,void>
: public TemplateFactory4<mapper,reducer,partitioner,combiner>{
};
template <class mapper, class reducer, class partitioner=void,
class combiner=void, class recordReader=void,
class recordWriter=void>
class TemplateFactory
: public TemplateFactory5<mapper,reducer,partitioner,combiner,recordReader>{
public:
RecordWriter* createRecordWriter(ReduceContext& context) const {
return new recordWriter(context);
}
};
template <class mapper, class reducer, class partitioner,
class combiner, class recordReader>
class TemplateFactory<mapper, reducer, partitioner, combiner, recordReader,
void>
: public TemplateFactory5<mapper,reducer,partitioner,combiner,recordReader>{
};
}
#endif
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