91 lines
2.9 KiB
YAML
91 lines
2.9 KiB
YAML
# 工厂模式知识库
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pattern:
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id: "factory-pattern"
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name: "工厂模式"
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category: "创建型模式"
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description: "定义一个创建对象的接口，让子类决定实例化哪一个类，使一个类的实例化延迟到其子类"
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# 模式结构
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structure:
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participants:
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- name: "Factory"
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role: "抽象工厂接口"
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description: "声明创建产品对象的抽象方法"
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- name: "ConcreteFactory"
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role: "具体工厂"
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description: "实现抽象工厂接口，创建具体产品"
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- name: "Product"
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role: "抽象产品"
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description: "定义产品的共同接口"
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- name: "ConcreteProduct"
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role: "具体产品"
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description: "实现抽象产品接口的具体类"
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# 项目中的应用
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applications:
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- module: "pay"
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location: "PayClientFactory"
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purpose: "创建支付客户端实例"
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code_path: "yudao-module-pay/.../pay/core/client/PayClientFactory.java"
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implementation: |
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public interface PayClientFactory {
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PayClient getPayClient(Long channelId);
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<Config extends PayClientConfig> PayClient createOrUpdatePayClient(
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Long channelId, String channelCode, Config config);
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}
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- module: "infra/sms"
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location: "SmsClientFactory"
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purpose: "创建短信客户端实例"
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code_path: "yudao-module-infra/.../sms/core/client/SmsClientFactory.java"
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implementation: |
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public class SmsClientFactoryImpl implements SmsClientFactory {
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private final ConcurrentMap<Long, AbstractSmsClient> channelIdClients = new ConcurrentHashMap<>();
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@Override
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public SmsClient createOrUpdateSmsClient(SmsChannelProperties properties) {
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AbstractSmsClient client = channelIdClients.get(properties.getId());
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if (client == null) {
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client = this.createSmsClient(properties);
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client.init();
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channelIdClients.put(client.getId(), client);
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} else {
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client.refresh(properties);
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}
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return client;
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}
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}
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# 使用场景
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scenarios:
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- "需要根据配置动态创建不同类型的客户端"
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- "需要管理多个同类对象的实例（如缓存）"
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- "创建逻辑复杂，需要封装"
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- "需要支持扩展新的产品类型"
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# 优点
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advantages:
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- "解耦创建逻辑和使用逻辑"
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- "便于扩展新产品类型"
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- "可以缓存和复用对象实例"
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- "统一管理对象生命周期"
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# 缺点
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disadvantages:
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- "增加了类的数量"
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- "需要维护工厂类的实现"
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# 扩展指南
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extension_guide:
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title: "如何新增产品类型"
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steps:
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- step: 1
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action: "创建具体产品类"
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description: "实现Product接口"
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- step: 2
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action: "修改工厂创建逻辑"
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description: "在工厂中添加新类型的创建分支"
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- step: 3
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action: "配置支持"
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description: "添加配置枚举或配置项" |