IndexViewManager (apache-cassandra API)

java.lang.Object
- org.apache.cassandra.index.sai.view.IndexViewManager

```
public class IndexViewManager
extends java.lang.Object
```
Maintain an atomic view for read requests, so that requests can read all data during concurrent compactions.
All per-column SSTableIndex updates should be proxied by StorageAttachedIndexGroup to make sure per-sstable SSTableContext are in-sync.

Constructor Summary

Constructors
Constructor Description

IndexViewManager(StorageAttachedIndex index)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`drop(java.util.Collection<SSTableReader> sstablesToRebuild)`
`void`	`invalidate()`	Called when index is dropped.
`java.util.Collection<SSTableContext>`	`update(java.util.Collection<SSTableReader> oldSSTables, java.util.Collection<SSTableContext> newSSTableContexts, IndexValidation validation)`	Replaces old SSTables with new by creating new immutable view.
`View`	`view()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IndexViewManager

public IndexViewManager(StorageAttachedIndex index)

Method Detail
- view
```
public View view()
```
- update
```
public java.util.Collection<SSTableContext> update(java.util.Collection<SSTableReader> oldSSTables,
                                                   java.util.Collection<SSTableContext> newSSTableContexts,
                                                   IndexValidation validation)
```
  Replaces old SSTables with new by creating new immutable view.
  
  Parameters:
  
  oldSSTables - A set of SSTables to remove.
  
  newSSTableContexts - A set of SSTableContexts to add to tracker.
  
  validation - Controls how indexes should be validated
  
  Returns:
  
  A set of SSTables which have attached to them invalid index components.
- drop
```
public void drop(java.util.Collection<SSTableReader> sstablesToRebuild)
```
- invalidate
```
public void invalidate()
```
  Called when index is dropped. Mark all SSTableIndex as released and per-column index files will be removed when in-flight queries are completed.