ShardCoreKeyMap (core 5.6.16 API)

```
public final class ShardCoreKeyMap
extends java.lang.Object
```
A map between segment core cache keys and the shard that these segments belong to. This allows to get the shard that a segment belongs to or to get the entire set of live core cache keys for a given index. In order to work this class needs to be notified about new segments. It modifies the current mappings as segments that were not known before are added and prevents the structure from growing indefinitely by registering close listeners on these segments so that at any time it only tracks live segments. NOTE: This is heavy. Avoid using this class unless absolutely required.

Constructors
Constructor and Description
`ShardCoreKeyMap()`

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`add(org.apache.lucene.index.LeafReader reader)` Register a `LeafReader`.
`java.util.Set<java.lang.Object>`	`getCoreKeysForIndex(java.lang.String index)` Get the set of core cache keys associated with the given index.
`ShardId`	`getShardId(java.lang.Object coreKey)` Return the `ShardId` that holds the given segment, or `null` if this segment is not tracked.
`int`	`size()` Return the number of tracked segments.

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

Class ShardCoreKeyMap