D-Net

package eu.dnetlib.data.mapreduce.hbase.propagation.communitythroughorganization;

import eu.dnetlib.data.mapreduce.hbase.propagation.Utils;

import eu.dnetlib.data.mapreduce.hbase.propagation.Value;

import eu.dnetlib.data.proto.ResultProtos;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.hadoop.hbase.client.Put;

import org.apache.hadoop.hbase.io.ImmutableBytesWritable;

import org.apache.hadoop.hbase.mapreduce.TableReducer;

import org.apache.hadoop.hbase.util.Bytes;

import org.apache.hadoop.io.Text;

import java.io.IOException;

import java.util.HashSet;

import java.util.Iterator;

import java.util.Set;

import static eu.dnetlib.data.mapreduce.hbase.propagation.PropagationConstants.*;

public class PropagationCommunityThroughOrganizationReducer extends TableReducer<ImmutableBytesWritable, Text, ImmutableBytesWritable> {

    private static final Log log = LogFactory.getLog(PropagationCommunityThroughOrganizationReducer.class); // NOPMD by marko on 11/24/08 5:02 PM

    private ImmutableBytesWritable keyOut;

    @Override

    protected void setup(final Context context) throws IOException, InterruptedException {

        super.setup(context);

        keyOut = new ImmutableBytesWritable();

    }

    @Override

    protected void reduce(ImmutableBytesWritable key, Iterable<Text> values, Context context) throws IOException, InterruptedException {

        Iterator<Text> it = values.iterator();

        DedupedList communities = new DedupedList();

        Set<String> resultIds = new HashSet<>();

        while (it.hasNext()) {

            Value v = Value.fromJson(it.next().toString());

            switch (v.getType()) {

                case fromorganization:

                    communities.addAll(DedupedList.fromJson(v.getValue()));

                    break;

                case fromresult:

                    resultIds.add(v.getValue());

                    break;

            }

        }

        if (communities.size() > 0) {

            final ResultProtos.Result.Metadata.Builder metadata = ResultProtos.Result.Metadata.newBuilder();

            communities.stream().forEach(community -> {

                metadata.addContext(Utils.getContext(community, ORGANIZATION_COMMUNITY_TRUST, CLASS_ORGANIZATION_ID, DATA_INFO_TYPE, CLASS_ORGANIZATION_NAME));

                context.getCounter(COUNTER_PROPAGATION, "added result to community " + community).increment(resultIds.size());

            });

            for (String result : resultIds) {

                final Put put = new Put(Bytes.toBytes(result)).add(Bytes.toBytes("result"), Bytes.toBytes("update_" + System.nanoTime()), Utils.getUpdate(metadata, result).toByteArray());

                keyOut.set(Bytes.toBytes(result));

                context.write(keyOut, put);

                context.getCounter(COUNTER_PROPAGATION, "added community to result").increment(communities.size());

            }

        }

    }

}