/**
* Copyright 2012 LiveRamp
*
* 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 com.liveramp.cascading_ext.combiner.lib;
import java.io.Serializable;
import java.util.ArrayList;
import cascading.tuple.Tuple;
import cascading.tuple.TupleEntry;
import com.liveramp.cascading_ext.combiner.CombinerUtils;
import com.liveramp.cascading_ext.combiner.ExactAggregator;
import com.liveramp.cascading_ext.combiner.lib.ExactAggregatorDefinition;
import com.liveramp.commons.util.MemoryUsageEstimator;
public class MultiExactAggregator implements ExactAggregator<ArrayList<Object>> {
private ExactAggregatorDefinition[] exactAggregatorDefinitions;
private TupleEntry[] inputTupleEntries;
private TupleEntry[] intermediateTupleEntries;
private ArrayList<Integer>[] inputFieldsPos;
private ArrayList<Integer>[] intermediateFieldsPos;
public MultiExactAggregator(ExactAggregatorDefinition... exactAggregatorDefinitions) {
this.exactAggregatorDefinitions = exactAggregatorDefinitions;
}
private void prepare() {
if (inputTupleEntries == null) {
this.inputTupleEntries = new TupleEntry[exactAggregatorDefinitions.length];
this.intermediateTupleEntries = new TupleEntry[exactAggregatorDefinitions.length];
this.inputFieldsPos = new ArrayList[exactAggregatorDefinitions.length];
this.intermediateFieldsPos = new ArrayList[exactAggregatorDefinitions.length];
for (int i = 0; i < exactAggregatorDefinitions.length; ++i) {
inputTupleEntries[i] = new TupleEntry(exactAggregatorDefinitions[i].getInputFields(), Tuple.size(exactAggregatorDefinitions[i].getInputFields().size()));
intermediateTupleEntries[i] = new TupleEntry(exactAggregatorDefinitions[i].getIntermediateFields(), Tuple.size(exactAggregatorDefinitions[i].getIntermediateFields().size()));
inputFieldsPos[i] = new ArrayList<Integer>(exactAggregatorDefinitions[i].getInputFields().size());
intermediateFieldsPos[i] = new ArrayList<Integer>(exactAggregatorDefinitions[i].getIntermediateFields().size());
}
}
}
@Override
public ArrayList<Object> initialize() {
ArrayList<Object> aggregate = new ArrayList<Object>(exactAggregatorDefinitions.length);
for (int i = 0; i < exactAggregatorDefinitions.length; ++i) {
aggregate.add(exactAggregatorDefinitions[i].getAggregator().initialize());
}
return aggregate;
}
@Override
public ArrayList<Object> partialAggregate(ArrayList<Object> aggregate, TupleEntry nextValue) {
prepare();
for (int i = 0; i < exactAggregatorDefinitions.length; ++i) {
// Load tuple entry
CombinerUtils.setTupleEntry(inputTupleEntries[i], inputFieldsPos[i], exactAggregatorDefinitions[i].getInputFields(), nextValue);
// Aggregate
aggregate.set(i, exactAggregatorDefinitions[i].getAggregator().partialAggregate(aggregate.get(i), inputTupleEntries[i]));
}
return aggregate;
}
@Override
public Tuple toPartialTuple(ArrayList<Object> aggregate) {
Tuple tuple = new Tuple();
for (int i = 0; i < exactAggregatorDefinitions.length; ++i) {
tuple.addAll(exactAggregatorDefinitions[i].getAggregator().toPartialTuple(aggregate.get(i)));
}
return tuple;
}
@Override
public ArrayList<Object> finalAggregate(ArrayList<Object> aggregate, TupleEntry partialAggregate) {
prepare();
for (int i = 0; i < exactAggregatorDefinitions.length; ++i) {
// Load tuple entry
CombinerUtils.setTupleEntry(intermediateTupleEntries[i], intermediateFieldsPos[i], exactAggregatorDefinitions[i].getIntermediateFields(), partialAggregate);
// Aggregate
aggregate.set(i, exactAggregatorDefinitions[i].getAggregator().finalAggregate(aggregate.get(i), intermediateTupleEntries[i]));
}
return aggregate;
}
@Override
public Tuple toFinalTuple(ArrayList<Object> aggregate) {
Tuple tuple = new Tuple();
for (int i = 0; i < exactAggregatorDefinitions.length; ++i) {
tuple.addAll(exactAggregatorDefinitions[i].getAggregator().toFinalTuple(aggregate.get(i)));
}
return tuple;
}
public class ObjectValueMemoryUsageEstimator implements MemoryUsageEstimator<ArrayList<Object>>, Serializable {
@Override
public long estimateMemorySize(ArrayList<Object> items) {
long size = 12; // ArrayList overhead
for (int i = 0; i < exactAggregatorDefinitions.length; ++i) {
if (exactAggregatorDefinitions[i].getValueSizeEstimator() == null) {
throw new RuntimeException("Memory bound cache used for combining but memory estimator not specified for individual aggregators.");
}
size += exactAggregatorDefinitions[i].getValueSizeEstimator().estimateMemorySize(items.get(i));
}
return size;
}
}
}