Examples with JoinClause com.hazelcast.jet.pipeline.JoinClause used on opensource projects

Example 1 with JoinClause

use of com.hazelcast.jet.pipeline.JoinClause in project hazelcast by hazelcast.

the class HashJoinTransform method addToDag.

// ---------           ----------           ----------
// | primary |         | joined-1 |         | joined-2 |
// ---------           ----------           ----------
// |                   |                     |
// |              distributed          distributed
// |               broadcast            broadcast
// |                   v                     v
// |             -------------         -------------
// |            | collector-1 |       | collector-2 |
// |            | localPara=1 |       | localPara=1 |
// |             -------------         -------------
// |                   |                     |
// |                 local                 local
// local             broadcast             broadcast
// unicast           prioritized           prioritized
// ordinal 0           ordinal 1             ordinal 2
// \                   |                     |
// ----------------\  |   /----------------/
// v  v  v
// --------
// | joiner |
// --------
@Override
@SuppressWarnings("unchecked")
public void addToDag(Planner p, Context context) {
    determineLocalParallelism(LOCAL_PARALLELISM_USE_DEFAULT, context, p.isPreserveOrder());
    PlannerVertex primary = p.xform2vertex.get(this.upstream().get(0));
    List keyFns = toList(this.clauses, JoinClause::leftKeyFn);
    List<Tag> tags = this.tags;
    BiFunctionEx mapToOutputBiFn = this.mapToOutputBiFn;
    TriFunction mapToOutputTriFn = this.mapToOutputTriFn;
    // must be extracted to variable, probably because of serialization bug
    BiFunctionEx<List<Tag>, Object[], ItemsByTag> tupleToItems = tupleToItemsByTag(whereNullsNotAllowed);
    Vertex joiner = p.addVertex(this, name() + "-joiner", determinedLocalParallelism(), () -> new HashJoinP<>(keyFns, tags, mapToOutputBiFn, mapToOutputTriFn, tupleToItems)).v;
    Edge edgeToJoiner = from(primary.v, primary.nextAvailableOrdinal()).to(joiner, 0);
    if (p.isPreserveOrder()) {
        edgeToJoiner.isolated();
    } else {
        applyRebalancing(edgeToJoiner, this);
    }
    p.dag.edge(edgeToJoiner);
    String collectorName = name() + "-collector";
    int collectorOrdinal = 1;
    for (Transform fromTransform : tailList(this.upstream())) {
        PlannerVertex fromPv = p.xform2vertex.get(fromTransform);
        JoinClause<?, ?, ?, ?> clause = this.clauses.get(collectorOrdinal - 1);
        FunctionEx<Object, Object> getKeyFn = (FunctionEx<Object, Object>) clause.rightKeyFn();
        FunctionEx<Object, Object> projectFn = (FunctionEx<Object, Object>) clause.rightProjectFn();
        Vertex collector = p.dag.newVertex(collectorName + collectorOrdinal, () -> new HashJoinCollectP(getKeyFn, projectFn));
        collector.localParallelism(1);
        p.dag.edge(from(fromPv.v, fromPv.nextAvailableOrdinal()).to(collector, 0).distributed().broadcast());
        p.dag.edge(from(collector, 0).to(joiner, collectorOrdinal).broadcast().priority(-1));
        collectorOrdinal++;
    }
}