/*
* Copyright (c) 2008-2013, 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 tutorials;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import com.hazelcast.mapreduce.aggregation.Aggregation;
import com.hazelcast.mapreduce.aggregation.Aggregations;
import com.hazelcast.mapreduce.aggregation.PropertyExtractor;
import com.hazelcast.mapreduce.aggregation.Supplier;
import model.SalaryYear;
public class Tutorial7 implements Tutorial {
@Override
public void execute(HazelcastInstance hazelcastInstance) throws Exception {
IMap<String, SalaryYear> map = hazelcastInstance.getMap("salaries");
Supplier<String, SalaryYear, Integer> supplier = Supplier.all(new SalaryPropertyExtractor());
Aggregation<String, Integer, Integer> aggregation = Aggregations.integerSum();
int sum = map.aggregate(supplier, aggregation);
System.out.println("Salary sum: " + sum);
}
private static class SalaryPropertyExtractor implements PropertyExtractor<SalaryYear, Integer> {
@Override
public Integer extract(SalaryYear salaryYear) {
return salaryYear.getAnnualSalary();
}
}
}