MVStore.TxCounter

java.lang.Object
- org.h2.mvstore.MVStore.TxCounter

Enclosing class:

MVStore
```
public static final class MVStore.TxCounter
extends java.lang.Object
```
Class TxCounter is a simple data structure to hold version of the store along with the counter of open transactions, which are still operating on this version.

Field Summary

Fields
Modifier and Type	Field	Description
`private int`	`counter`	Counter of outstanding operation on this version of a store
`private static java.util.concurrent.atomic.AtomicIntegerFieldUpdater<MVStore.TxCounter>`	`counterUpdater`
`long`	`version`	Version of a store, this TxCounter is related to

Constructor Summary

Constructors
Constructor Description

TxCounter(long version)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) int`	`decrementAndGet()`	Decrement and get the counter values.
`(package private) int`	`get()`
`(package private) int`	`incrementAndGet()`	Increment and get the counter value.
`java.lang.String`	`toString()`

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

- Field Detail
  - version
```
public final long version
```
    Version of a store, this TxCounter is related to
  - counter
```
private volatile int counter
```
    Counter of outstanding operation on this version of a store
  - counterUpdater
```
private static final java.util.concurrent.atomic.AtomicIntegerFieldUpdater<MVStore.TxCounter> counterUpdater
```
- Constructor Detail
  - TxCounter
```
TxCounter(long version)
```
- Method Detail
  - get
```
int get()
```
  - incrementAndGet
```
int incrementAndGet()
```
    Increment and get the counter value.
    
    Returns:
    
    the new value
  - decrementAndGet
```
int decrementAndGet()
```
    Decrement and get the counter values.
    
    Returns:
    
    the new value
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object