org.bitcoinj.utils

Class VersionTally

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 and Description
VersionTally(NetworkParameters params)

Method Summary

Modifier and Type	Method and 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.