TemplateFactory.hh
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上传日期:2018-01-08
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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