/*
* Copyright (C) 2014 The Calrissian Authors
*
* 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 org.calrissian.flowmix.api.aggregator;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang.StringUtils;
import org.calrissian.flowmix.api.Aggregator;
import org.calrissian.flowmix.core.model.event.AggregatedEvent;
import org.calrissian.flowmix.core.support.window.WindowItem;
import org.calrissian.mango.domain.Tuple;
import org.calrissian.mango.domain.event.BaseEvent;
import org.calrissian.mango.domain.event.Event;
import static java.lang.System.currentTimeMillis;
import static java.util.UUID.randomUUID;
@Deprecated
public class LongSumAggregator implements Aggregator {
public static final String SUM_FIELD = "sumField";
public static final String OUTPUT_FIELD = "outputField";
public static final String DEFAULT_OUTPUT_FIELD = "sum";
protected String sumField;
protected String outputField = DEFAULT_OUTPUT_FIELD;
protected Map<String,Collection<Tuple>> groupedValues;
protected String[] groupByFields;
protected long sum = 0;
@Override
public void configure(Map<String, String> configuration) {
if(configuration.get(GROUP_BY) != null)
groupByFields = StringUtils.splitPreserveAllTokens(configuration.get(GROUP_BY), GROUP_BY_DELIM);
if(configuration.get(OUTPUT_FIELD) != null)
outputField = configuration.get(OUTPUT_FIELD);
if(configuration.get(SUM_FIELD) != null)
sumField = configuration.get(SUM_FIELD);
else
throw new RuntimeException("Sum aggregator needs a field to sum. Property missing: " + SUM_FIELD);
}
@Override
public void added(WindowItem item) {
if(groupedValues == null && groupByFields != null) {
groupedValues = new HashMap<String, Collection<Tuple>>();
for(String group : groupByFields)
groupedValues.put(group, item.getEvent().getAll(group));
}
if(item.getEvent().get(sumField) != null)
sum += ((Long)item.getEvent().get(sumField).getValue());
}
@Override
public void evicted(WindowItem item) {
if(item.getEvent().get(sumField) != null)
sum -= ((Long)item.getEvent().get(sumField).getValue());
}
@Override
public List<AggregatedEvent> aggregate() {
Event event = new BaseEvent(randomUUID().toString(), currentTimeMillis());
if(groupedValues != null && groupByFields != null) {
for(Collection<Tuple> tuples : groupedValues.values())
event.putAll(tuples);
}
event.put(new Tuple(outputField, sum));
return Collections.singletonList(new AggregatedEvent(event));
}
}