Class GlobalGrouping

All Implemented Interfaces:
Serializable, CustomStreamGrouping

public class GlobalGrouping extends Object implements CustomStreamGrouping
See Also:
  • Constructor Details

    • GlobalGrouping

      public GlobalGrouping()
  • Method Details

    • prepare

      public void prepare(WorkerTopologyContext context, GlobalStreamId stream, List<Integer> targets)
      Description copied from interface: CustomStreamGrouping
      Tells the stream grouping at runtime the tasks in the target bolt. This information should be used in chooseTasks to determine the target tasks.

      It also tells the grouping the metadata on the stream this grouping will be used on.

      Specified by:
      prepare in interface CustomStreamGrouping
    • chooseTasks

      public List<Integer> chooseTasks(int i, List<Object> list)
      Description copied from interface: CustomStreamGrouping
      This function implements a custom stream grouping. It takes in as input the number of tasks in the target bolt in prepare and returns the tasks to send the tuples to.
      Specified by:
      chooseTasks in interface CustomStreamGrouping
      list - the values to group on