Package org.springframework.data.cassandra.core.cql

Interface ReactiveResultSetExtractor<T>

All Known Implementing Classes:
ReactiveRowMapperResultSetExtractor
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public interface ReactiveResultSetExtractor<T>
Callback interface used by ReactiveCqlTemplate's query methods. Implementations of this interface perform the actual work of extracting results from a ReactiveResultSet, but don't need to worry about exception handling. DriverExceptions will be caught and handled by the calling ReactiveCqlTemplate.

This interface is mainly used within the CQL framework itself. A RowMapper is usually a simpler choice for ReactiveResultSet processing, mapping one result object per row instead of one result object for the entire ReactiveResultSet.

Note: ReactiveResultSetExtractor object is typically stateless and thus reusable, as long as it doesn't access stateful resources or keep result state within the object.

Since:
2.0
Author:
Mark Paluch
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    org.reactivestreams.Publisher<T>
    extractData(ReactiveResultSet resultSet)
    Implementations must implement this method to process the entire ReactiveResultSet.

  • Method Details

    • extractData

      org.reactivestreams.Publisher<T> extractData(ReactiveResultSet resultSet) throws com.datastax.oss.driver.api.core.DriverException, DataAccessException
      Implementations must implement this method to process the entire ReactiveResultSet.
      Parameters:
      resultSet - ReactiveResultSet to extract data from, must not be null.
      Returns:
      an arbitrary result object Publisher.
      Throws:
      com.datastax.oss.driver.api.core.DriverException - if a DriverException is encountered getting column values or navigating (that is, there's no need to catch DriverException).
      DataAccessException - in case of custom exceptions.