Package org.apache.lucene.index

# Interface IndexReader.ClosedListener

Enclosing class:
  `IndexReader`

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 static interface IndexReader.ClosedListener
A listener that is called when a resource gets closed.

WARNING: This API is experimental and might change in incompatible ways in the next release.

## Method Summary

Modifier and Type
Method
Description
`void`
`onClose(IndexReader.CacheKey key)`
Invoked when the resource (segment core, or index reader) that is being cached on is closed.

## Method Details

### onClose

void onClose(IndexReader.CacheKey key) throws IOException
Invoked when the resource (segment core, or index reader) that is being cached on is closed.

Throws:
  `IOException`