Package org.apache.jackrabbit.oak.plugins.observation.filter

Interface EventAggregator

public interface EventAggregator
An EventAggregator can be provided via a FilterProvider and is then used to 'aggregate' an event at creation time (ie after filtering).

Aggregation in this context means to have the event identifier not be the path (as usual) but one of its parents. This allows to have client code use an aggregating filter and ignore the event paths but only inspect the event identifier which is then the aggregation parent node.

  • Method Details

    • aggregate

      int aggregate(NodeState root, List<ChildNodeEntry> parents, PropertyState propertyState)
      Aggregates a property change
      Returns:
      0 or negative for no aggregation, positive indicating how many levels to aggregate upwards the tree.

    • aggregate

      int aggregate(NodeState root, List<ChildNodeEntry> parents, ChildNodeEntry childNodeState)
      Aggregates a node change
      Returns:
      0 or negative for no aggregation, positive indicating how many levels to aggregate upwards the tree.