org.exoplatform.addon.wallet.blockchain.service

Class EthereumClientConnector

java.lang.Object

org.exoplatform.addon.wallet.blockchain.service.EthereumClientConnector

All Implemented Interfaces:

org.exoplatform.addon.wallet.statistic.ExoWalletStatisticService, org.picocontainer.Startable

public class EthereumClientConnector
extends Object
implements org.exoplatform.addon.wallet.statistic.ExoWalletStatisticService, org.picocontainer.Startable

A Web3j connector class to interact with Ethereum Blockchain

Constructor Summary

Constructors

Constructor and Description
EthereumClientConnector()

Method Summary

Modifier and Type	Method and Description
Set<String>	getContractTransactions(String contractsAddress, long fromBlock, long toBlock) Retrieve from blockchain transaction hashes from contract starting from a block number to a block number
long	getLastestBlockNumber()
BigInteger	getNonce(String walletAddress) Retruns current nonce to use for next transaction to use on blockchain for a selected wallet address
Map<String,Object>	getStatisticParameters(String statisticType, Object result, Object... methodArgs)
org.web3j.protocol.core.methods.response.Transaction	getTransaction(String transactionHash) Get transaction by hash
org.web3j.tx.TransactionManager	getTransactionManager(org.web3j.crypto.Credentials credentials) Return TransactionManager to use when interacting with blockchain
org.web3j.protocol.core.methods.response.TransactionReceipt	getTransactionReceipt(String transactionHash) Get transaction receipt by hash
org.web3j.protocol.Web3j	getWeb3j()
void	start()
void	start(boolean blocking)
void	stop()

Methods inherited from class java.lang.Object

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

Constructor Detail

EthereumClientConnector

public EthereumClientConnector()

Method Detail

start

public void start()

Specified by:

start in interface org.picocontainer.Startable

start

public void start(boolean blocking)

stop

public void stop()

Specified by:

stop in interface org.picocontainer.Startable

getTransactionManager

public org.web3j.tx.TransactionManager getTransactionManager(org.web3j.crypto.Credentials credentials)

Return TransactionManager to use when interacting with blockchain

Parameters:

credentials - wallet credentials to use for this transaction manager

Returns:

TransactionManager

getTransaction

public org.web3j.protocol.core.methods.response.Transaction getTransaction(String transactionHash)

Get transaction by hash

Parameters:

transactionHash - transaction hash to retrieve

Returns:

Web3j Transaction object

getTransactionReceipt

public org.web3j.protocol.core.methods.response.TransactionReceipt getTransactionReceipt(String transactionHash)

Get transaction receipt by hash

Parameters:

transactionHash - transaction hash to retrieve

Returns:

Web3j Transaction receipt object

getLastestBlockNumber

public long getLastestBlockNumber()
                           throws IOException

Returns:

last mined block number from blockchain

Throws:

IOException - when error sending transaction on blockchain

getContractTransactions

public Set<String> getContractTransactions(String contractsAddress,
                                           long fromBlock,
                                           long toBlock)
                                    throws IOException

Retrieve from blockchain transaction hashes from contract starting from a block number to a block number

Parameters:

contractsAddress - blockchain contract address

fromBlock - search starting from this block number

toBlock - search until this block number

Returns:

a Set of transaction hashes

Throws:

IOException - if an error happens while getting information from blockchain

getStatisticParameters

public Map<String,Object> getStatisticParameters(String statisticType,
                                                 Object result,
                                                 Object... methodArgs)

Specified by:

getStatisticParameters in interface org.exoplatform.addon.wallet.statistic.ExoWalletStatisticService

getNonce

public BigInteger getNonce(String walletAddress)
                    throws IOException

Retruns current nonce to use for next transaction to use on blockchain for a selected wallet address

Parameters:

walletAddress - wallet adres to determine its next nonce

Returns:

next transaction nonce

Throws:

IOException - if an I/O problem happens when connecting to blockchain

getWeb3j

public org.web3j.protocol.Web3j getWeb3j()