IndexHandler (Pinot local segment implementations 0.12.1 API)

All Known Implementing Classes:

BaseIndexHandler, BloomFilterHandler, ForwardIndexHandler, FSTIndexHandler, H3IndexHandler, InvertedIndexHandler, JsonIndexHandler, RangeIndexHandler, TextIndexHandler
```
public interface IndexHandler
```
Interface for index handlers, which update the corresponding type of indices, like adding, removing or converting the format.

Method Summary

Modifier and Type	Method	Description
`boolean`	`needUpdateIndices(SegmentDirectory.Reader segmentReader)`	Check if there is a need to add new indices or removes obsolete indices.
`void`	`postUpdateIndicesCleanup(SegmentDirectory.Writer segmentWriter)`	Performs any cleanup actions required after the indexes have been updated.
`void`	`updateIndices(SegmentDirectory.Writer segmentWriter, IndexCreatorProvider indexCreatorProvider)`	Adds new indices and removes obsolete indices.

- Method Detail
  - updateIndices
```
void updateIndices(SegmentDirectory.Writer segmentWriter,
                   IndexCreatorProvider indexCreatorProvider)
            throws Exception
```
    Adds new indices and removes obsolete indices.
    
    Throws:
    
    Exception
  - needUpdateIndices
```
boolean needUpdateIndices(SegmentDirectory.Reader segmentReader)
                   throws Exception
```
    Check if there is a need to add new indices or removes obsolete indices.
    
    Returns:
    
    true if there is a need to update.
    
    Throws:
    
    Exception
  - postUpdateIndicesCleanup
```
void postUpdateIndicesCleanup(SegmentDirectory.Writer segmentWriter)
                       throws Exception
```
    Performs any cleanup actions required after the indexes have been updated. Should be called only after all IndexHandlers have run.
    
    Throws:
    
    Exception