Package com.exonum.binding.core.blockchain

Class Block

java.lang.Object

com.exonum.binding.core.blockchain.Block

public abstract class Block
extends Object

Exonum block header data structure.

A block is essentially a list of transactions, which is a result of the consensus algorithm (thus authenticated by the supermajority of validators) and is applied atomically to the blockchain state.

This structure only contains the amount of transactions and the transactions root hash as well as other information, but not the transactions themselves.

See Also:

Blockchain

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Block.Builder

Constructor Summary

Constructors

Constructor	Description
Block()

Method Summary

Modifier and Type	Method	Description
static Block.Builder	builder()	Creates a new block builder.
abstract HashCode	getBlockHash()	Returns the SHA-256 hash of this block.
abstract long	getHeight()	Returns the height of this block which is a distance between the last block and the "genesis" block.
abstract int	getNumTransactions()	Number of transactions in this block.
abstract HashCode	getPreviousBlockHash()	Hash link to the previous block in the blockchain.
abstract int	getProposerId()	Identifier of the leader node which has proposed the block.
abstract HashCode	getStateHash()	Hash of the blockchain state after applying transactions in the block.
abstract HashCode	getTxRootHash()	Root hash of the Merkle tree of transactions in this block.
int	hashCode()
boolean	isEmpty()	Returns true if this block is empty: contains no transactions.
static com.google.gson.TypeAdapter<Block>	typeAdapter(com.google.gson.Gson gson)	Provides a Gson type adapter for this class.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Block

public Block()

Method Detail

getBlockHash

public abstract HashCode getBlockHash()

Returns the SHA-256 hash of this block.

getProposerId

public abstract int getProposerId()

Identifier of the leader node which has proposed the block.

getHeight

public abstract long getHeight()

Returns the height of this block which is a distance between the last block and the "genesis" block. Genesis block has 0 height. Therefore, the blockchain height is equal to the number of blocks plus one.

The height also identifies each block in the blockchain.

isEmpty

public final boolean isEmpty()

Returns true if this block is empty: contains no transactions.

getNumTransactions

public abstract int getNumTransactions()

Number of transactions in this block.

getPreviousBlockHash

public abstract HashCode getPreviousBlockHash()

Hash link to the previous block in the blockchain.

getTxRootHash

public abstract HashCode getTxRootHash()

Root hash of the Merkle tree of transactions in this block. These transactions can be accessed with Blockchain.getBlockTransactions(Block).

getStateHash

public abstract HashCode getStateHash()

Hash of the blockchain state after applying transactions in the block.

See Also:

Schema.getStateHashes()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

typeAdapter

public static com.google.gson.TypeAdapter<Block> typeAdapter(com.google.gson.Gson gson)

Provides a Gson type adapter for this class.

See Also:

CoreTypeAdapterFactory

builder

public static Block.Builder builder()

Creates a new block builder.