AtomicKeySetImpl (Infinispan JavaDoc All 9.4.26.Final API)

java.lang.Object
- org.infinispan.atomic.impl.AtomicKeySetImpl<K>

All Implemented Interfaces:

MergeOnStore
```
public final class AtomicKeySetImpl<K>
extends Object
implements MergeOnStore
```
This class is expected to be modified without locking, and results merged using the merge(Object) method when committing to DC. Also, the keys are not persisted, we record only existence of this map and then upon load we retrieve the keys through GetKeysInGroupCommand. On transactional cache it is safe to execute concurrent adds/removes to this class even without the lock because we'll never prepare-commit another transaction that would modify the same key concurrently - the transaction will be synchronized on the modified key (which acquires locks properly). This is kind of piggybacking on other key's locking scheme. The only exception to that rule is when we attempt to remove this map completely - this is not safe to proceed concurrently to any other modification.

- Nested Class Summary
  
  Nested Classes
  Modifier and Type Class Description
  
  static class AtomicKeySetImpl.Externalizer
  
  static class AtomicKeySetImpl.FunctionExternalizer
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  Object merge(Object other)
  
  String toString()
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - merge
```
public Object merge(Object other)
```
    Specified by:
    
    merge in interface MergeOnStore
    
    Parameters:
    
    other - Actual value stored in the cache, or null if the entry does not exist.
    
    Returns:
    
    Value that will be stored in the cache, or null if it should be removed.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object