forked from D-Net/dnet-hadoop
WIP: promote job functions implementation snapshot
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@ -1,45 +1,134 @@
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package eu.dnetlib.dhp.actionmanager;
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import eu.dnetlib.dhp.schema.oaf.Oaf;
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import eu.dnetlib.dhp.schema.oaf.OafEntity;
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import eu.dnetlib.dhp.schema.oaf.Relation;
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import org.apache.spark.api.java.function.FilterFunction;
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import org.apache.spark.api.java.function.MapFunction;
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import org.apache.spark.api.java.function.ReduceFunction;
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import org.apache.spark.sql.Column;
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import org.apache.spark.sql.Dataset;
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import org.apache.spark.sql.Encoder;
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import org.apache.spark.sql.Encoders;
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import org.apache.spark.sql.TypedColumn;
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import org.apache.spark.sql.expressions.Aggregator;
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import scala.Tuple2;
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import java.util.Objects;
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import java.util.Optional;
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import java.util.function.BiFunction;
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import java.util.function.Function;
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public class PromoteActionSetFromHDFSFunctions {
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public static <T extends OafEntity> Dataset<T> groupEntitiesByIdAndMerge(Dataset<T> entityDS,
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Class<T> clazz) {
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return entityDS
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.groupByKey((MapFunction<T, String>) OafEntity::getId, Encoders.STRING())
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.reduceGroups((ReduceFunction<T>) (x1, x2) -> {
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x1.mergeFrom(x2);
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return x1;
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})
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.map((MapFunction<Tuple2<String, T>, T>) pair -> pair._2, Encoders.bean(clazz));
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public static <T extends Oaf> Dataset<T> joinOafEntityWithActionPayloadAndMerge(Dataset<T> oafDS,
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Dataset<String> actionPayloadDS,
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SerializableSupplier<Function<T, String>> oafIdFn,
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SerializableSupplier<BiFunction<String, Class<T>, T>> actionPayloadToOafFn,
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SerializableSupplier<BiFunction<T, T, T>> mergeAndGetFn,
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Class<T> clazz) {
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Dataset<Tuple2<String, T>> oafWithIdDS = oafDS
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.map((MapFunction<T, Tuple2<String, T>>) value -> new Tuple2<>(oafIdFn.get().apply(value), value),
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Encoders.tuple(Encoders.STRING(), Encoders.kryo(clazz)));
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Dataset<Tuple2<String, T>> actionPayloadWithIdDS = actionPayloadDS
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.map((MapFunction<String, T>) value -> actionPayloadToOafFn.get().apply(value, clazz), Encoders.kryo(clazz))
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.filter((FilterFunction<T>) Objects::nonNull)
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.map((MapFunction<T, Tuple2<String, T>>) value -> new Tuple2<>(oafIdFn.get().apply(value), value),
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Encoders.tuple(Encoders.STRING(), Encoders.kryo(clazz)));
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return oafWithIdDS
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.joinWith(actionPayloadWithIdDS, oafWithIdDS.col("_1").equalTo(actionPayloadWithIdDS.col("_1")), "left_outer")
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.map((MapFunction<Tuple2<Tuple2<String, T>, Tuple2<String, T>>, T>) value -> {
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T left = value._1()._2();
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return Optional
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.ofNullable(value._2())
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.map(Tuple2::_2)
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.map(x -> mergeAndGetFn.get().apply(left, x))
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.orElse(left);
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}, Encoders.kryo(clazz));
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}
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public static <T extends OafEntity, S> Dataset<T> joinEntitiesWithActionPayloadAndMerge(Dataset<T> entityDS,
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Dataset<S> actionPayloadDS,
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BiFunction<Dataset<T>, Dataset<S>, Column> entityToActionPayloadJoinExpr,
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BiFunction<S, Class<T>, T> actionPayloadToEntityFn,
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Class<T> clazz) {
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return entityDS
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.joinWith(actionPayloadDS, entityToActionPayloadJoinExpr.apply(entityDS, actionPayloadDS), "left_outer")
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.map((MapFunction<Tuple2<T, S>, T>) pair -> Optional
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.ofNullable(pair._2())
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.map(x -> {
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T entity = actionPayloadToEntityFn.apply(x, clazz);
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pair._1().mergeFrom(entity);
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return pair._1();
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})
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.orElse(pair._1()), Encoders.bean(clazz));
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public static <T extends Oaf> Dataset<T> groupOafByIdAndMerge(Dataset<T> oafDS,
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SerializableSupplier<Function<T, String>> oafIdFn,
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SerializableSupplier<BiFunction<T, T, T>> mergeAndGetFn,
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Class<T> clazz) {
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return oafDS
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.groupByKey((MapFunction<T, String>) x -> oafIdFn.get().apply(x), Encoders.STRING())
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.reduceGroups((ReduceFunction<T>) (v1, v2) -> mergeAndGetFn.get().apply(v1, v2))
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.map((MapFunction<Tuple2<String, T>, T>) Tuple2::_2, Encoders.kryo(clazz));
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}
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public static <T extends Oaf> Dataset<T> groupOafByIdAndMergeUsingAggregator(Dataset<T> oafDS,
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SerializableSupplier<T> zeroFn,
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SerializableSupplier<Function<T, String>> idFn,
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Class<T> clazz) {
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TypedColumn<T, T> aggregator = new OafAggregator<>(zeroFn, clazz).toColumn();
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return oafDS
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.groupByKey((MapFunction<T, String>) x -> idFn.get().apply(x), Encoders.STRING())
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.agg(aggregator)
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.map((MapFunction<Tuple2<String, T>, T>) Tuple2::_2, Encoders.kryo(clazz));
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}
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}
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public static class OafAggregator<T extends Oaf> extends Aggregator<T, T, T> {
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private SerializableSupplier<T> zero;
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private Class<T> clazz;
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public OafAggregator(SerializableSupplier<T> zero, Class<T> clazz) {
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this.zero = zero;
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this.clazz = clazz;
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}
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@Override
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public T zero() {
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return zero.get();
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}
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@Override
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public T reduce(T b, T a) {
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return mergeFrom(b, a);
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}
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@Override
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public T merge(T b1, T b2) {
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return mergeFrom(b1, b2);
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}
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private T mergeFrom(T left, T right) {
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if (isNonNull(left)) {
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if (left instanceof Relation) {
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((Relation) left).mergeFrom((Relation) right);
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return left;
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}
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((OafEntity) left).mergeFrom((OafEntity) right);
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return left;
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}
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if (right instanceof Relation) {
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((Relation) right).mergeFrom((Relation) left);
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return right;
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}
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((OafEntity) right).mergeFrom((OafEntity) left);
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return right;
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}
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private Boolean isNonNull(T a) {
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return Objects.nonNull(a.getLastupdatetimestamp());
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}
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@Override
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public T finish(T reduction) {
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return reduction;
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}
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@Override
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public Encoder<T> bufferEncoder() {
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return Encoders.kryo(clazz);
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}
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@Override
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public Encoder<T> outputEncoder() {
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return Encoders.kryo(clazz);
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}
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}
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}
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