Examples with ReturnResultsReducer org.apache.storm.trident.drpc.ReturnResultsReducer used on opensource projects

Example 1 with ReturnResultsReducer

use of org.apache.storm.trident.drpc.ReturnResultsReducer in project storm by apache.

the class TridentTopology method completeDRPC.

private static void completeDRPC(DefaultDirectedGraph<Node, IndexedEdge> graph, Map<String, List<Node>> colocate, UniqueIdGen gen) {
    List<Set<Node>> connectedComponents = new ConnectivityInspector<>(graph).connectedSets();
    for (Set<Node> g : connectedComponents) {
        checkValidJoins(g);
    }
    TridentTopology helper = new TridentTopology(graph, colocate, gen);
    for (Set<Node> g : connectedComponents) {
        SpoutNode drpcNode = getDRPCSpoutNode(g);
        if (drpcNode != null) {
            Stream lastStream = new Stream(helper, null, getLastAddedNode(g));
            Stream s = new Stream(helper, null, drpcNode);
            helper.multiReduce(s.project(new Fields("return-info")).batchGlobal(), lastStream.batchGlobal(), new ReturnResultsReducer(), new Fields());
        }
    }
}