org.apache.cassandra.io.sstable.format

## Interface SSTableFlushObserver

- All Known Implementing Classes:
    PerSSTableIndexWriter

      public interface SSTableFlushObserver

  Observer for events in the lifecycle of writing out an sstable.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `begin()` Called before writing any data to the sstable.
    `void` | `complete()` Called when all data is written to the file and it's ready to be finished up.
    `void` | `nextUnfilteredCluster(Unfiltered unfilteredCluster)` Called after the unfiltered cluster is written to the sstable.
    `void` | `startPartition(DecoratedKey key, long indexPosition)` Called when a new partition in being written to the sstable, but before any cells are processed (see `nextUnfilteredCluster(Unfiltered)`).

- - ### Method Detail

    - #### begin

          void begin()

      Called before writing any data to the sstable.

    - #### startPartition

          void startPartition(DecoratedKey key,
                              long indexPosition)

      Called when a new partition in being written to the sstable, but before any cells are processed (see `nextUnfilteredCluster(Unfiltered)`).
      Parameters:
        `key` - The key being appended to SSTable.
        `indexPosition` - The position of the key in the SSTable PRIMARY_INDEX file.

    - #### nextUnfilteredCluster

          void nextUnfilteredCluster(Unfiltered unfilteredCluster)

      Called after the unfiltered cluster is written to the sstable. Will be preceded by a call to `startPartition(DecoratedKey, long)`, and the cluster should be assumed to belong to that partition.
      Parameters:
        `unfilteredCluster` - The unfiltered cluster being added to SSTable.

    - #### complete

          void complete()

      Called when all data is written to the file and it's ready to be finished up.

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