项目结构：

# encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : PyCharm 2024.3.6 python 3.11 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 7:03 # User : geovindu # Product : PyCharm # Project : pydesginpattern # File : fail_fast.py class ResourceCheckFailedError(Exception): """ 快速失败：资源不可用" """ pass # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : PyCharm 2024.3.6 python 3.11 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 7:04 # User : geovindu # Product : PyCharm # Project : pydesginpattern # File : inventory_repo.py class InventoryRepository: """ """ def __init__(self): self.inventory = { "DIA001": 5, "DIA002": 0, "GOLD001": 20 } def get_stock(self, product_id: str)->int|None: """ :param product_id: :return: """ return self.inventory.get(product_id, -1) def deduct_stock(self, product_id: str, quantity: int)->int|None: """ :param product_id: :param quantity: :return: """ self.inventory[product_id] -= quantity # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : PyCharm 2024.3.6 python 3.11 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 7:05 # User : geovindu # Product : PyCharm # Project : pydesginpattern # File : external_services_repo.py class ExternalServices: """ """ def __init__(self): self.inventory_service = True self.payment_gateway = True self.quality_inspection = True self.invoice_service = True # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : PyCharm 2024.3.6 python 3.11 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 7:05 # User : geovindu # Product : PyCharm # Project : pydesginpattern # File : validation_service.py from FailFastPattern.exceptions.fail_fast import ResourceCheckFailedError from FailFastPattern.repository.external_services_repo import ExternalServices from FailFastPattern.repository.inventory_repo import InventoryRepository class ValidationService: """ """ def __init__( self, inventory_repo: InventoryRepository, ext_services: ExternalServices ): self.inventory_repo = inventory_repo self.ext_services = ext_services def fail_fast_check(self, customer_id: str, product_id: str, quantity: int): """ Fail-Fast 核心：全部资源一次性检查，不满足立即失败 :param customer_id: :param product_id: :param quantity: :return: """ # 1. 顾客检查 if not customer_id or len(customer_id) < 3: raise ResourceCheckFailedError("顾客信息无效") # 2. 商品存在检查 stock = self.inventory_repo.get_stock(product_id) if stock < 0: raise ResourceCheckFailedError(f"商品 {product_id} 不存在") # 3. 库存足够检查 if stock < quantity: raise ResourceCheckFailedError(f"商品 {product_id} 库存不足") # 4. 外部服务检查 if not self.ext_services.inventory_service: raise ResourceCheckFailedError("库存服务不可用") if not self.ext_services.payment_gateway: raise ResourceCheckFailedError("支付网关不可用") if not self.ext_services.quality_inspection: raise ResourceCheckFailedError("质检系统不可用") if not self.ext_services.invoice_service: raise ResourceCheckFailedError("发票系统不可用") # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : PyCharm 2024.3.6 python 3.11 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 7:06 # User : geovindu # Product : PyCharm # Project : pydesginpattern # File : order_service.py from FailFastPattern.exceptions.fail_fast import ResourceCheckFailedError from FailFastPattern.repository.external_services_repo import ExternalServices from FailFastPattern.repository.inventory_repo import InventoryRepository from FailFastPattern.service.validation_service import ValidationService from ParallelismPattern.models.entities import Order class OrderService: """ """ def __init__( self, validation_service: ValidationService, inventory_repo: InventoryRepository, ext_services: ExternalServices ): self.validation = validation_service self.inventory_repo = inventory_repo self.ext_services = ext_services def create_order(self, customer_id: str, product_id: str, quantity: int)->dict: """ :param customer_id: :param product_id: :param quantity: :return: """ try: # ========== 第一步：快速失败检查 ========== self.validation.fail_fast_check(customer_id, product_id, quantity) # ========== 检查通过：执行业务 ========== self.inventory_repo.deduct_stock(product_id, quantity) return { "order_id": "ORD-JWL-9999", "product_id": product_id, "quantity": quantity, "remaining_stock": self.inventory_repo.get_stock(product_id), "status": "success" } except ResourceCheckFailedError as e: raise e # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : PyCharm 2024.3.6 python 3.11 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 7:06 # User : geovindu # Product : PyCharm # Project : pydesginpattern # File : order_controller.py from FailFastPattern.service.order_service import OrderService class OrderController: """ """ def __init__(self, order_service: OrderService): self.order_service = order_service def create_jewelry_order(self, customer_id: str, product_id: str, quantity: int)->dict: """ :param customer_id: :param product_id: :param quantity: :return: """ try: result = self.order_service.create_order(customer_id, product_id, quantity) return {"success": True, "data": result} except Exception as e: return {"success": False, "error": f"快速失败: {str(e)}"}

调用：

# encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : PyCharm 2024.3.6 python 3.11 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 7:15 # User : geovindu # Product : PyCharm # Project : pydesginpattern # File : FailFastBll.py from FailFastPattern.api.order_controller import OrderController from FailFastPattern.repository.external_services_repo import ExternalServices from FailFastPattern.repository.inventory_repo import InventoryRepository from FailFastPattern.service.order_service import OrderService from FailFastPattern.service.validation_service import ValidationService class FailFastBll(object): """ """ def demo(self): """ :return: """ # 初始化依赖 inventory_repo = InventoryRepository() ext_services = ExternalServices() validation_service = ValidationService(inventory_repo, ext_services) order_service = OrderService(validation_service, inventory_repo, ext_services) controller = OrderController(order_service) print("==== 场景1：正常下单 ===") print(controller.create_jewelry_order("C1001", "DIA001", 1)) print("\n==== 场景2：库存不足 ===") print(controller.create_jewelry_order("C1001", "DIA002", 1)) print("\n==== 场景3：顾客无效 ===") print(controller.create_jewelry_order("C", "DIA001", 1)) print("\n==== 场景4：支付服务挂了 ===") ext_services.payment_gateway = False print(controller.create_jewelry_order("C1001", "DIA001", 1))

输出：