BftQueryService (plugin-api 21.1.1 API)

All Superinterfaces:

PoaQueryService
```
public interface BftQueryService
extends PoaQueryService
```
Allows for the BFT specific aspects of the block chain to be queried.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`getConsensusMechanismName()`	Returns the literal name of the BFT consensus mechanism is use (eg ibft or qbft), which forms the prefix for all BFT metrics.
`int`	`getRoundNumberFrom(BlockHeader header)`	Extracts the round number from the supplied header and returns it to the caller.
`java.util.Collection<Address>`	`getSignersFrom(BlockHeader header)`	Extracts the collection of signers from the supplied block header and returns them to the caller.

Methods inherited from interface org.hyperledger.besu.plugin.services.query.PoaQueryService
getLocalSignerAddress, getProposerOfBlock, getValidatorsForLatestBlock

- Method Detail
  - getRoundNumberFrom
```
int getRoundNumberFrom(BlockHeader header)
```
    Extracts the round number from the supplied header and returns it to the caller.
    
    Parameters:
    
    header - the block header from which the round number is to be extracted
    
    Returns:
    
    The number of failed rounds executed prior to adding the block to the chain.
  - getSignersFrom
```
java.util.Collection<Address> getSignersFrom(BlockHeader header)
```
    Extracts the collection of signers from the supplied block header and returns them to the caller.
    
    Parameters:
    
    header - the block header from which a list of signers is to be extracted
    
    Returns:
    
    The addresses of
  - getConsensusMechanismName
```
java.lang.String getConsensusMechanismName()
```
    Returns the literal name of the BFT consensus mechanism is use (eg ibft or qbft), which forms the prefix for all BFT metrics.
    
    Returns:
    
    The name of the consensus mechanism being used by Besu