| /* |
| * Copyright 2009-2013 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.hdfs.dataflow; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.lang.reflect.Constructor; |
| |
| import org.apache.hadoop.mapred.FileSplit; |
| import org.apache.hadoop.mapred.InputSplit; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| |
| @SuppressWarnings({ "deprecation", "rawtypes" }) |
| public class InputSplitsFactory implements Serializable { |
| |
| private static final long serialVersionUID = 1L; |
| private byte[] splitBytes; |
| private String splitClassName; |
| |
| public InputSplitsFactory(InputSplit[] splits) throws HyracksDataException { |
| splitBytes = splitsToBytes(splits); |
| if (splits.length > 0) { |
| splitClassName = splits[0].getClass().getName(); |
| } else { |
| splitClassName = FileSplit.class.getName(); |
| } |
| } |
| |
| public InputSplit[] getSplits() throws HyracksDataException { |
| return bytesToSplits(splitBytes); |
| } |
| |
| /** |
| * Convert splits to bytes. |
| * |
| * @param splits |
| * input splits |
| * @return bytes which serialize the splits |
| * @throws IOException |
| */ |
| private byte[] splitsToBytes(InputSplit[] splits) throws HyracksDataException { |
| try { |
| ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
| DataOutputStream dos = new DataOutputStream(bos); |
| dos.writeInt(splits.length); |
| for (int i = 0; i < splits.length; i++) { |
| splits[i].write(dos); |
| } |
| dos.close(); |
| return bos.toByteArray(); |
| } catch (Exception e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| |
| /** |
| * Covert bytes to splits. |
| * |
| * @param bytes |
| * @return |
| * @throws HyracksDataException |
| */ |
| private InputSplit[] bytesToSplits(byte[] bytes) throws HyracksDataException { |
| try { |
| Class splitClass = Class.forName(splitClassName); |
| Constructor[] constructors = splitClass.getDeclaredConstructors(); |
| Constructor defaultConstructor = null; |
| for (Constructor constructor : constructors) { |
| if (constructor.getParameterTypes().length == 0) { |
| constructor.setAccessible(true); |
| defaultConstructor = constructor; |
| } |
| } |
| ByteArrayInputStream bis = new ByteArrayInputStream(bytes); |
| DataInputStream dis = new DataInputStream(bis); |
| int size = dis.readInt(); |
| InputSplit[] splits = new InputSplit[size]; |
| for (int i = 0; i < size; i++) { |
| splits[i] = (InputSplit) defaultConstructor.newInstance(); |
| splits[i].readFields(dis); |
| } |
| dis.close(); |
| return splits; |
| } catch (Exception e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| } |