/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.test.capedwarf.testsuite.mapreduce.support;
import com.google.appengine.tools.mapreduce.KeyValue;
import com.google.appengine.tools.mapreduce.Reducer;
import com.google.appengine.tools.mapreduce.ReducerInput;
/**
* From Google AppEngine MapReduce Examples.
*
* @author ohler@google.com (Christian Ohler)
* @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
*/
public class CountReducer extends Reducer<String, Long, KeyValue<String, Long>> {
private static final long serialVersionUID = 1L;
private void emit(String key, long outValue) {
//log.info("emit(" + outValue + ")");
getContext().emit(KeyValue.of(key, outValue));
}
@Override
public void reduce(String key, ReducerInput<Long> values) {
long total = 0;
while (values.hasNext()) {
long value = values.next();
total += value;
}
emit(key, total);
}
}