Package org.apache.cassandra.triggers

Interface ITrigger

public interface ITrigger
Trigger interface, For every partition update received by the coordinator augment(Partition) is called.

Contract:
1) Implementation of this interface should only have a constructor without parameters
2) ITrigger implementation can be instantiated multiple times during the server life time. (Depends on the number of times trigger folder is updated.)
3) ITrigger implementation should be state-less (avoid dependency on instance variables).

The API is still beta and can change.

  • Method Summary

    Modifier and Type
    Method
    Description
    Collection<Mutation>
    augment(Partition update)
    Called exactly once per CF update, returned mutations are atomically updated.

  • Method Details

    • augment

      Collection<Mutation> augment(Partition update)
      Called exactly once per CF update, returned mutations are atomically updated.
      Parameters:
      update - - update received for the CF
      Returns:
      additional modifications to be applied along with the supplied update