逸仙电商Seata企业级落地实践

@GlobalLock
@Transactional
public PayMoneyDto detail(ProcessOnEventRequestDto processOnEventRequestDto) {
    return baseMapper.detail(processOnEventRequestDto.getProcessInfoDto().getBusinessKey())
}

@Mapper
public interface PayMoneyMapper extends BaseMapper<PayMoney> {
    
    @Select("select id, name, amount, account, has_repayment, pay_amount from pay_money m where m.business_key = #{businessKey} for update")
    PayMoneyDto detail(@Param("businessKey") String businessKey);
}

@Override
public TableMeta getTableMeta(final Connection connection, final String tableName, String resourceId) {
    if (StringUtils.isNullOrEmpty(tableName)) {
        throw new IllegalArgumentException("TableMeta cannot be fetched without tableName");
    }

    TableMeta tmeta;
    final String key = getCacheKey(connection, tableName, resourceId);
    //错误关键处，尝试从缓存获取表结构
    tmeta = TABLE_META_CACHE.get(key, mappingFunction -> {
        try {
            return fetchSchema(connection, tableName);
        } catch (SQLException e) {
            LOGGER.error("get table meta of the table `{}` error: {}", tableName, e.getMessage(), e);
            return null;
        }
    });

    if (tmeta == null) {
        throw new ShouldNeverHappenException(String.format("[xid:%s]get table meta failed," +
                                                           " please check whether the table `%s` exists.", RootContext.getXID(), tableName));
    }
    return tmeta;
}

@Override
public GlobalStatus commit(String xid) throws TransactionException {
    //根据xid查询信息，如果开启主从，会有可能导致查询信息不完整
    GlobalSession globalSession = SessionHolder.findGlobalSession(xid);
    if (globalSession == null) {
        return GlobalStatus.Finished;
    }
    globalSession.addSessionLifecycleListener(SessionHolder.getRootSessionManager());
    // just lock changeStatus

    boolean shouldCommit = SessionHolder.lockAndExecute(globalSession, () -> {
        // Highlight: Firstly, close the session, then no more branch can be registered.
        globalSession.closeAndClean();
        if (globalSession.getStatus() == GlobalStatus.Begin) {
            if (globalSession.canBeCommittedAsync()) {
                globalSession.asyncCommit();
                return false;
            } else {
                globalSession.changeStatus(GlobalStatus.Committing);
                return true;
            }
        }
        return false;
    });

    if (shouldCommit) {
        boolean success = doGlobalCommit(globalSession, false);
        //If successful and all remaining branches can be committed asynchronously, do async commit.
        if (success && globalSession.hasBranch() && globalSession.canBeCommittedAsync()) {
            globalSession.asyncCommit();
            return GlobalStatus.Committed;
        } else {
            return globalSession.getStatus();
        }
    } else {
        return globalSession.getStatus() == GlobalStatus.AsyncCommitting ? GlobalStatus.Committed : globalSession.getStatus();
    }
}

@Override
public GlobalStatus rollback(String xid) throws TransactionException {
    //根据xid查询信息，如果开启主从，会有可能导致查询信息不完整
    GlobalSession globalSession = SessionHolder.findGlobalSession(xid);
    if (globalSession == null) {
        return GlobalStatus.Finished;
    }
    globalSession.addSessionLifecycleListener(SessionHolder.getRootSessionManager());
    // just lock changeStatus
    boolean shouldRollBack = SessionHolder.lockAndExecute(globalSession, () -> {
        globalSession.close(); // Highlight: Firstly, close the session, then no more branch can be registered.
        if (globalSession.getStatus() == GlobalStatus.Begin) {
            globalSession.changeStatus(GlobalStatus.Rollbacking);
            return true;
        }
        return false;
    });
    if (!shouldRollBack) {
        return globalSession.getStatus();
    }

    doGlobalRollback(globalSession, false);
    return globalSession.getStatus();
}

# 广州机房
registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10

  nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "Guangzhou"
    username = ""
    password = ""
  }
}

# 上海机房
registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10

  nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "Shanghai"
    username = ""
    password = ""
  }
}