分布式数据库双十一活动

# 示例代码：使用两阶段提交实现分布式事务
from distributed_transaction import TwoPhaseCommit

def transfer_money(from_account, to_account, amount):
    try:
        with TwoPhaseCommit() as tx:
            from_account.debit(amount)
            to_account.credit(amount)
        print("Transaction successful")
    except Exception as e:
        print(f"Transaction failed: {e}")

# 示例代码：使用负载均衡器分发请求
from load_balancer import LoadBalancer

lb = LoadBalancer(nodes=["node1", "node2", "node3"])

def handle_request(request):
    node = lb.get_next_node()
    response = node.process_request(request)
    return response

# 示例代码：使用缓存减少数据库访问
from cache import Cache

cache = Cache()

def get_user_info(user_id):
    if user_id in cache:
        return cache[user_id]
    else:
        user_info = fetch_from_database(user_id)
        cache[user_id] = user_info
        return user_info