PNCounter (Debezium Core 1.8.1.Final API)

All Superinterfaces:

Count, GCount, GCounter, PNCount

All Known Subinterfaces:

DeltaCounter

All Known Implementing Classes:

StateBasedPNCounter, StateBasedPNDeltaCounter
```
@NotThreadSafe
public interface PNCounter
extends PNCount, GCounter
```
A simple counter that maintains a single changing value by separately tracking the positive and negative changes. It is inspired by the conflict-free replicated data type (CRDT) P-N Counter. The semantics ensure the value converges toward the global number of increments minus the number of decrements. The global total can be calculated by merging all the replicated instances, without regard to order of merging.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`PNCounter`	`decrement()`	Decrement the counter and get the result.
`long`	`decrementAndGet()`	Decrement the counter and get the result.
`long`	`getAndDecrement()`	Decrement the counter and get the result.
`PNCounter`	`increment()`	Increment the counter and get the result.
`PNCounter`	`merge(Count other)`	Merge the supplied counter into this counter.

Methods inherited from interface io.debezium.crdt.GCount
getIncrement

Methods inherited from interface io.debezium.crdt.GCounter
getAndIncrement, incrementAndGet

Methods inherited from interface io.debezium.crdt.PNCount
get, getDecrement

- Method Detail
  - increment
```
PNCounter increment()
```
    Increment the counter and get the result.
    
    Specified by:
    
    increment in interface GCounter
    
    Returns:
    
    this instance so methods can be chained together; never null
  - decrement
```
PNCounter decrement()
```
    Decrement the counter and get the result.
    
    Returns:
    
    this instance so methods can be chained together; never null
  - decrementAndGet
```
long decrementAndGet()
```
    Decrement the counter and get the result.
    
    Returns:
    
    the current result after decrementing
  - getAndDecrement
```
long getAndDecrement()
```
    Decrement the counter and get the result.
    
    Returns:
    
    the current result before decrementing
  - merge
```
PNCounter merge(Count other)
```
    Merge the supplied counter into this counter.
    
    Specified by:
    
    merge in interface GCounter
    
    Parameters:
    
    other - the other counter to merge into this one; may be null
    
    Returns:
    
    this counter so that methods can be chained