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package eu.dnetlib.data.mapreduce.hbase.dli;
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import java.io.IOException;
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import java.util.List;
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import com.google.common.collect.Lists;
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import com.google.protobuf.InvalidProtocolBufferException;
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import com.googlecode.protobuf.format.JsonFormat;
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import eu.dnetlib.data.mapreduce.hbase.dli.kv.DliKey;
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import eu.dnetlib.data.proto.dli.ScholixObjectProtos.Scholix;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
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import org.apache.hadoop.io.Text;
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import org.apache.hadoop.mapreduce.Reducer;
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/**
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* Created by claudio on 13/03/2017.
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*/
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public class PrepareScholixDataReducer2 extends Reducer<DliKey, ImmutableBytesWritable, Text, Text> {
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private static final Log log = LogFactory.getLog(PrepareScholixDataReducer2.class); // NOPMD by marko on 11/24/08 5:02 PM
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private Text outKey;
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private Text outValue;
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@Override
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protected void setup(final Context context) throws IOException, InterruptedException {
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outKey = new Text("");
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outValue = new Text();
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}
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@Override
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protected void reduce(DliKey key, Iterable<ImmutableBytesWritable> values, Context context) throws IOException, InterruptedException {
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final List<Scholix> scholixes = Lists.newArrayList();
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values.forEach(i -> scholixes.add(parse(key, i).build()));
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System.out.println("reducing key = " + key);
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if (!scholixes.isEmpty()) {
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final Scholix source = getSource(context, scholixes);
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if (source == null) {
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context.getCounter("scholix", "missing source").increment(1);
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System.out.println(String.format("missing source in group of %s: %s", scholixes.size(), key.getId()));
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System.out.println(scholixes);
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return;
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}
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scholixes.forEach(t -> {
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if (!t.hasSource()) {
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final Scholix.Builder rel = Scholix.newBuilder(t);
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if (rel.hasTarget()) {
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rel.setSource(source.getSource());
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emit(context, JsonFormat.printToString(rel.build()));
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} else {
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context.getCounter("scholix", "missing target").increment(1);
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}
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}
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});
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}
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}
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private Scholix getSource(final Context context, final List<Scholix> scholixes) {
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for (int i = 0; i < scholixes.size(); i++) {
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final Scholix s = scholixes.get(i);
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if (s.hasSource()) {
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context.getCounter("scholix", "first source in position " + i).increment(1);
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context.getCounter("scholix", "group size " + scholixes.size()).increment(1);
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return s;
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}
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}
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return null;
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}
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private Scholix.Builder parse(DliKey key, final ImmutableBytesWritable value) {
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try {
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return Scholix.newBuilder(Scholix.parseFrom(value.copyBytes()));
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} catch (InvalidProtocolBufferException e) {
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throw new IllegalArgumentException(String.format("cannot parse Scholix, keytype '%s', id '%s'", key.getKeyType(), key.getId()));
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}
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}
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private void emit(final Context context, final String data) {
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outValue.set(data.getBytes());
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try {
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context.write(outKey, outValue);
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} catch (Exception e) {
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e.printStackTrace();
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throw new RuntimeException(e);
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}
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}
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}
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