| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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. |
| */ |
| package edu.uci.ics.hyracks.dataflow.std.map; |
| |
| import java.util.Random; |
| |
| import edu.uci.ics.hyracks.api.dataflow.IDataWriter; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| |
| public class SamplerDeserializedMapperFactory implements IDeserializedMapperFactory { |
| private static final long serialVersionUID = 1L; |
| private final float sampleRatio; |
| |
| public SamplerDeserializedMapperFactory(float sampleRatio) { |
| this.sampleRatio = sampleRatio; |
| } |
| |
| @Override |
| public IDeserializedMapper createMapper() throws HyracksDataException { |
| return new IDeserializedMapper() { |
| private Random random = new Random(); |
| |
| @Override |
| public void map(Object[] data, IDataWriter<Object[]> writer) throws HyracksDataException { |
| if (random.nextFloat() <= sampleRatio) { |
| writer.writeData(data); |
| } |
| } |
| }; |
| } |
| } |