DistributedMetaStorageListener (Ignite 2.17.0)

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 interface DistributedMetaStorageListener<T extends Serializable>
```
Listener for distributed metastorage data updates.

See Also:

ReadableDistributedMetaStorage.listen(Predicate, DistributedMetaStorageListener)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onUpdate(@NotNull String key, T oldVal, T newVal)`	Invoked in two cases: data was dynamicaly updated; node was started.

- Method Detail
  - onUpdate
```
void onUpdate(@NotNull
              @NotNull String key,
              @Nullable
              T oldVal,
              @Nullable
              T newVal)
```
    Invoked in two cases:
    
    data was dynamicaly updated;
    
    node was started. In this case oldVal and newVal might be different only if new data was received from cluster
    Parameters:
    
    key - The key.
    
    oldVal - Previous value associated with the key.
    
    newVal - New value after update.