CASRequest (apache-cassandra API)
Date: 2018-02-12

org.apache.cassandra.service

## Interface CASRequest

- All Known Implementing Classes:
    CQL3CasRequest

      public interface CASRequest

  Abstract the conditions and updates for a CAS operation.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `appliesTo(ColumnFamily current)` Returns whether the provided CF, that represents the values fetched using the readFilter(), match the CAS conditions this object stands for.
    `ColumnFamily` | `makeUpdates(ColumnFamily current)` The updates to perform of a CAS success.
    `IDiskAtomFilter` | `readFilter()` The filter to use to fetch the value to compare for the CAS.

- - ### Method Detail

    - #### readFilter

          IDiskAtomFilter readFilter()

      The filter to use to fetch the value to compare for the CAS.

    - #### appliesTo

          boolean appliesTo(ColumnFamily current)
                     throws InvalidRequestException

      Returns whether the provided CF, that represents the values fetched using the readFilter(), match the CAS conditions this object stands for.
      Throws:
        `InvalidRequestException`

    - #### makeUpdates

          ColumnFamily makeUpdates(ColumnFamily current)
                            throws InvalidRequestException

      The updates to perform of a CAS success. The values fetched using the readFilter() are passed as argument.
      Throws:
        `InvalidRequestException`

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