AbstractDeltaReplicatedData

java.lang.Object
- akka.cluster.ddata.AbstractReplicatedData<A>
- - akka.cluster.ddata.AbstractDeltaReplicatedData<A,B>

All Implemented Interfaces:

DeltaReplicatedData, ReplicatedData
```
public abstract class AbstractDeltaReplicatedData<A extends AbstractDeltaReplicatedData<A,B>,B extends ReplicatedDelta>
extends AbstractReplicatedData<A>
implements DeltaReplicatedData
```
Java API: Interface for implementing a DeltaReplicatedData in Java.
The type parameter A is a self-recursive type to be defined by the concrete implementation. E.g. class TwoPhaseSet extends AbstractDeltaReplicatedData<TwoPhaseSet, TwoPhaseSet>

Constructor Summary

Constructors
Constructor Description

AbstractDeltaReplicatedData()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`scala.Option<ReplicatedDelta>`	`delta()`	Delegates to `deltaData()`, which must be implemented by subclass.
`abstract java.util.Optional<B>`	`deltaData()`	The accumulated delta of mutator operations since previous `DeltaReplicatedData.resetDelta()`.
`ReplicatedData`	`mergeDelta(ReplicatedDelta that)`	Delegates to `mergeDeltaData(B)`, which must be implemented by subclass.
`abstract A`	`mergeDeltaData(B that)`	When delta is merged into the full state this method is used.

Methods inherited from class akka.cluster.ddata.AbstractReplicatedData
merge, mergeData

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

Methods inherited from interface akka.cluster.ddata.DeltaReplicatedData
mergeDelta, resetDelta

Methods inherited from interface akka.cluster.ddata.ReplicatedData
merge

- Constructor Detail
  - AbstractDeltaReplicatedData
```
public AbstractDeltaReplicatedData()
```
- Method Detail
  - delta
```
public final scala.Option<ReplicatedDelta> delta()
```
    Delegates to deltaData(), which must be implemented by subclass.
    
    Specified by:
    
    delta in interface DeltaReplicatedData
  - deltaData
```
public abstract java.util.Optional<B> deltaData()
```
    The accumulated delta of mutator operations since previous DeltaReplicatedData.resetDelta(). When the Replicator invokes the modify function of the Update message and the user code is invoking one or more mutator operations the data is collecting the delta of the operations and makes it available for the Replicator with the deltaData() accessor. The modify function shall still return the full state in the same way as ReplicatedData without support for deltas.
  - mergeDelta
```
public final ReplicatedData mergeDelta(ReplicatedDelta that)
```
    Delegates to mergeDeltaData(B), which must be implemented by subclass.
  - mergeDeltaData
```
public abstract A mergeDeltaData(B that)
```
    When delta is merged into the full state this method is used. When the type D of the delta is of the same type as the full state T this method can be implemented by delegating to mergeData.