python: Fail-Fast Pattern

geovindu2026-07-01 16:23

项目结构：

python 复制代码 
# 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：

python 复制代码 
# 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：

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