/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.map.impl.query;
import com.hazelcast.aggregation.Aggregator;
import com.hazelcast.query.impl.QueryableEntry;
import com.hazelcast.spi.serialization.SerializationService;
import java.util.Collection;
/**
* Implementation of the {@link AccumulationExecutor} that runs the accumulation in the calling thread in a sequential fashion.
*/
public class CallerRunsAccumulationExecutor implements AccumulationExecutor {
private SerializationService serializationService;
public CallerRunsAccumulationExecutor(SerializationService serializationService) {
this.serializationService = serializationService;
}
@Override
@SuppressWarnings("unchecked")
public AggregationResult execute(
Aggregator aggregator, Collection<QueryableEntry> entries, Collection<Integer> partitionIds) {
Aggregator resultAggregator = serializationService.toObject(serializationService.toData(aggregator));
try {
for (QueryableEntry entry : entries) {
resultAggregator.accumulate(entry);
}
} finally {
resultAggregator.onAccumulationFinished();
}
AggregationResult result = new AggregationResult(resultAggregator);
result.setPartitionIds(partitionIds);
return result;
}
}