Memtable.Owner (apache-cassandra API)

All Known Implementing Classes:

ColumnFamilyStore

Enclosing interface:

Memtable
```
public static interface Memtable.Owner
```
Interface for providing signals back and requesting information from the owner, i.e. the object that controls the memtable. This is usually the ColumnFamilyStore; the interface is used to limit the dependency of memtables on the details of its implementation.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Memtable`	`getCurrentMemtable()`	Get the current memtable for this owner.
`java.lang.Iterable<Memtable>`	`getIndexMemtables()`	Collect the index memtables flushed together with this.
`ShardBoundaries`	`localRangeSplits(int shardCount)`	Construct a list of boundaries that split the locally-owned ranges into the given number of shards, splitting the owned space evenly.
`Future<CommitLogPosition>`	`signalFlushRequired(Memtable memtable, ColumnFamilyStore.FlushReason reason)`	Signal to the owner that a flush is required (e.g.

- Method Detail
  - signalFlushRequired
```
Future<CommitLogPosition> signalFlushRequired(Memtable memtable,
                                              ColumnFamilyStore.FlushReason reason)
```
    Signal to the owner that a flush is required (e.g. in response to hitting space limits)
  - getCurrentMemtable
```
Memtable getCurrentMemtable()
```
    Get the current memtable for this owner. Used to avoid capturing memtable in scheduled flush tasks.
  - getIndexMemtables
```
java.lang.Iterable<Memtable> getIndexMemtables()
```
    Collect the index memtables flushed together with this. Used to accurately calculate memory that would be freed by a flush.
  - localRangeSplits
```
ShardBoundaries localRangeSplits(int shardCount)
```
    Construct a list of boundaries that split the locally-owned ranges into the given number of shards, splitting the owned space evenly. It is up to the memtable to use this information. Any changes in the ring structure (e.g. added or removed nodes) will invalidate the splits; in such a case the memtable will be sent a Memtable.shouldSwitch(org.apache.cassandra.db.ColumnFamilyStore.FlushReason)(OWNED_RANGES_CHANGE) and, should that return false, a Memtable.localRangesUpdated() call.