/*
* 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.
*/
package org.apache.flink.test.classloading.jar;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.io.InputFormat;
import org.apache.flink.api.common.io.statistics.BaseStatistics;
import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.io.DiscardingOutputFormat;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.typeutils.ResultTypeQueryable;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.io.InputSplit;
import org.apache.flink.core.io.InputSplitAssigner;
@SuppressWarnings("serial")
public class CustomInputSplitProgram {
public static void main(String[] args) throws Exception {
ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
env.getConfig().disableSysoutLogging();
DataSet<Integer> data = env.createInput(new CustomInputFormat());
data
.map(new MapFunction<Integer, Tuple2<Integer, Double>>() {
@Override
public Tuple2<Integer, Double> map(Integer value) {
return new Tuple2<Integer, Double>(value, value * 0.5);
}
})
.output(new DiscardingOutputFormat<Tuple2<Integer, Double>>());
env.execute();
}
// --------------------------------------------------------------------------------------------
public static final class CustomInputFormat implements InputFormat<Integer, CustomInputSplit>, ResultTypeQueryable<Integer> {
private static final long serialVersionUID = 1L;
private Integer value;
@Override
public void configure(Configuration parameters) {}
@Override
public BaseStatistics getStatistics(BaseStatistics cachedStatistics) {
return null;
}
@Override
public CustomInputSplit[] createInputSplits(int minNumSplits) {
CustomInputSplit[] splits = new CustomInputSplit[minNumSplits];
for (int i = 0; i < minNumSplits; i++) {
splits[i] = new CustomInputSplit(i);
}
return splits;
}
@Override
public InputSplitAssigner getInputSplitAssigner(CustomInputSplit[] inputSplits) {
return new CustomSplitAssigner(inputSplits);
}
@Override
public void open(CustomInputSplit split) {
this.value = split.getSplitNumber();
}
@Override
public boolean reachedEnd() {
return this.value == null;
}
@Override
public Integer nextRecord(Integer reuse) {
Integer val = this.value;
this.value = null;
return val;
}
@Override
public void close() {}
@Override
public TypeInformation<Integer> getProducedType() {
return BasicTypeInfo.INT_TYPE_INFO;
}
}
public static final class CustomInputSplit implements InputSplit {
private static final long serialVersionUID = 1L;
private final int splitNumber;
public CustomInputSplit(int splitNumber) {
this.splitNumber = splitNumber;
}
@Override
public int getSplitNumber() {
return this.splitNumber;
}
}
public static final class CustomSplitAssigner implements InputSplitAssigner {
private final List<CustomInputSplit> remainingSplits;
public CustomSplitAssigner(CustomInputSplit[] splits) {
this.remainingSplits = new ArrayList<CustomInputSplit>(Arrays.asList(splits));
}
@Override
public InputSplit getNextInputSplit(String host, int taskId) {
synchronized (this) {
int size = remainingSplits.size();
if (size > 0) {
return remainingSplits.remove(size - 1);
} else {
return null;
}
}
}
}
}