How to use

getChainId

method

in

org.ethereum.config.BlockchainConfig

@Override
public Integer getChainIdForNextBlock() {
  BlockchainConfig nextBlockConfig = config.getBlockchainConfig().getConfigForBlock(getBlockchain()
      .getBestBlock().getNumber() + 1);
  return nextBlockConfig.getChainId();
}

@Test
public void testChainIdIsCorrectlySetOnEip160HFConfig() {
  GenesisConfig genesisConfig = new GenesisConfig();
  genesisConfig.eip155Block = 10;
  JsonNetConfig config = new JsonNetConfig(genesisConfig);
  BlockchainConfig eip160 = config.getConfigForBlock(10);
  assertEquals("Default chainId must be '1'", new Integer(1), eip160.getChainId());
  genesisConfig.chainId = 99;
  config = new JsonNetConfig(genesisConfig);
  eip160 = config.getConfigForBlock(10);
  assertEquals("chainId should be copied from genesis config", new Integer(99), eip160.getChainId());
}

@Test
public void testByzantiumBlock() {
  GenesisConfig genesisConfig = new GenesisConfig();
  genesisConfig.byzantiumBlock = 50;
  JsonNetConfig config = new JsonNetConfig(genesisConfig);
  assertBlockchainConfigExistsAt(config, 50, ByzantiumConfig.class);
  BlockchainConfig eip160 = config.getConfigForBlock(50);
  assertEquals("Default chainId must be '1'", new Integer(1), eip160.getChainId());
  genesisConfig.chainId = 99;
  config = new JsonNetConfig(genesisConfig);
  eip160 = config.getConfigForBlock(50);
  assertEquals("chainId should be copied from genesis config", new Integer(99), eip160.getChainId());
}

@Test
public void testConstantinopleBlock() {
  final int byzStart = 50;
  final int cnstStart = 60;
  GenesisConfig genesisConfig = new GenesisConfig();
  genesisConfig.constantinopleBlock = cnstStart;
  JsonNetConfig config = new JsonNetConfig(genesisConfig);
  assertBlockchainConfigExistsAt(config, cnstStart, ConstantinopleConfig.class);
  BlockchainConfig blockchainConfig = config.getConfigForBlock(cnstStart);
  assertEquals("Default chainId must be '1'", new Integer(1), blockchainConfig.getChainId());
  assertEquals("Reward should be 2 ETH", EtherUtil.convert(2, EtherUtil.Unit.ETHER), blockchainConfig.getConstants().getBLOCK_REWARD());
  assertTrue("EIP-1014 skinny CREATE2 should be activated among others", blockchainConfig.eip1014());
  genesisConfig.chainId = 99;
  config = new JsonNetConfig(genesisConfig);
  blockchainConfig = config.getConfigForBlock(cnstStart);
  assertEquals("chainId should be copied from genesis config", new Integer(99), blockchainConfig.getChainId());
  assertEquals("Default Frontier reward is 5 ETH", EtherUtil.convert(5, EtherUtil.Unit.ETHER),
      config.getConfigForBlock(byzStart).getConstants().getBLOCK_REWARD());
  genesisConfig.byzantiumBlock = byzStart;
  config = new JsonNetConfig(genesisConfig);  // Respawn so we have Byzantium on byzStart instead of Frontier
  assertEquals("Reward should be 3 ETH in Byzantium", EtherUtil.convert(3, EtherUtil.Unit.ETHER),
      config.getConfigForBlock(byzStart).getConstants().getBLOCK_REWARD());
  assertEquals("Reward should be changed to 2 ETH in Constantinople", EtherUtil.convert(2, EtherUtil.Unit.ETHER),
      config.getConfigForBlock(cnstStart).getConstants().getBLOCK_REWARD());
}