io.cdap.cdap.internal.app.runtime.batch.dataset.DataSetInputSplit Maven / Gradle / Ivy
/*
* Copyright © 2014-2016 Cask Data, Inc.
*
* 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 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.
*/
package io.cdap.cdap.internal.app.runtime.batch.dataset;
import com.google.common.base.Throwables;
import io.cdap.cdap.api.data.batch.Split;
import io.cdap.cdap.api.data.batch.Splits;
import io.cdap.cdap.api.dataset.Dataset;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.InputSplit;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
/**
* Class for {@link InputSplit} of a {@link Dataset}.
*
* @see InputSplit
*/
public class DataSetInputSplit extends InputSplit implements Writable {
private Split split;
public DataSetInputSplit() {
}
public DataSetInputSplit(final Split split) {
this.split = split;
}
public Split getSplit() {
return split;
}
@Override
public long getLength() throws IOException, InterruptedException {
return split.getLength();
}
@Override
public String[] getLocations() throws IOException, InterruptedException {
// By default splits locations are not provided (todo: fix)
return new String[0];
}
@Override
public void write(final DataOutput out) throws IOException {
Splits.serialize(split, out);
}
@SuppressWarnings("unchecked")
@Override
public void readFields(final DataInput in) throws IOException {
try {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
classLoader = getClass().getClassLoader();
}
split = Splits.deserialize(in, classLoader);
} catch (ClassNotFoundException e) {
throw Throwables.propagate(e);
}
}
}