VersionTally (bitcoinj-core 0.16.1 API)

java.lang.Object
- org.bitcoinj.utils.VersionTally

```
public class VersionTally
extends java.lang.Object
```
Caching counter for the block versions within a moving window. This class is NOT thread safe (as if two threads are trying to use it concurrently, there's risk of getting versions out of sequence).

See Also:

NetworkParameters.getMajorityWindow(), NetworkParameters.getMajorityEnforceBlockUpgrade(), NetworkParameters.getMajorityRejectBlockOutdated()

Constructor Summary

Constructors
Constructor Description

VersionTally(NetworkParameters params)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(long version)`	Add a new block version to the tally, and return the count for that version within the window.
`java.lang.Integer`	`getCountAtOrAbove(long version)`	Get the count of blocks at or above the given version, within the window.
`void`	`initialize(BlockStore blockStore, StoredBlock chainHead)`	Initialize the version tally from the block store.
`int`	`size()`	Get the size of the version window.

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

- Constructor Detail
  - VersionTally
```
public VersionTally(NetworkParameters params)
```
- Method Detail
  - add
```
public void add(long version)
```
    Add a new block version to the tally, and return the count for that version within the window.
    
    Parameters:
    
    version - the block version to add.
  - getCountAtOrAbove
```
public java.lang.Integer getCountAtOrAbove(long version)
```
    Get the count of blocks at or above the given version, within the window.
    
    Parameters:
    
    version - the block version to query.
    
    Returns:
    
    the count for the block version, or null if the window is not yet full.
  - initialize
```
public void initialize(BlockStore blockStore,
                       StoredBlock chainHead)
                throws BlockStoreException
```
    Initialize the version tally from the block store. Note this does not search backwards past the start of the block store, so if starting from a checkpoint this may not fill the window.
    
    Parameters:
    
    blockStore - block store to load blocks from.
    
    chainHead - current chain tip.
    
    Throws:
    
    BlockStoreException
  - size
```
public int size()
```
    Get the size of the version window.