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网站到期时间,适合网站开发的python,国内新闻最新消息10条2021,稳稳在哪个网站做的消防直播精心整理了最新的面试资料和简历模板，有需要的可以自行获取点击前往百度网盘获取点击前往夸克网盘获取简介 Axon Framework是一个用于构建CQRS（命令查询职责分离）和事件溯源（Event Sourcing）应用的框架&#xff0…

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简介

Axon Framework是一个用于构建CQRS（命令查询职责分离）和事件溯源（Event Sourcing）应用的框架，而Spring Boot提供了快速开发能力。二者结合可高效实现高扩展性、可维护的分布式系统。

环境准备

JDK 17+
Spring Boot 3.2+
Axon Framework 4.9+
Maven/Gradle

步骤详解

1. 创建Spring Boot项目

使用start.spring.io生成基础项目，选择：

Spring Web
Lombok（可选）

2. 添加Axon依赖

<!-- pom.xml -->
<dependency><groupId>org.axonframework</groupId><artifactId>axon-spring-boot-starter</artifactId><version>4.9.0</version>
</dependency>

3. 配置Axon（可选）

# application.yml
axon:serializer:general: jacksoneventhandling:processors:default: tracking

示例：银行账户管理

1. 定义命令(Command)

// 开户命令
public record CreateAccountCommand(String accountId, int initialBalance) {}// 存款命令
public record DepositMoneyCommand(String accountId, int amount) {}// 取款命令
public record WithdrawMoneyCommand(String accountId, int amount) {}

2. 定义事件(Event)

// 账户创建事件
public record AccountCreatedEvent(String accountId, int initialBalance) {}// 存款事件
public record MoneyDepositedEvent(String accountId, int amount) {}// 取款事件
public record MoneyWithdrawnEvent(String accountId, int amount) {}

3. 创建聚合根(Aggregate)

@Aggregate
@Getter
@NoArgsConstructor
public class BankAccountAggregate {@AggregateIdentifierprivate String accountId;private int balance;@CommandHandlerpublic BankAccountAggregate(CreateAccountCommand command) {apply(new AccountCreatedEvent(command.accountId(), command.initialBalance()));}@CommandHandlerpublic void handle(DepositMoneyCommand command) {apply(new MoneyDepositedEvent(command.accountId(), command.amount()));}@CommandHandlerpublic void handle(WithdrawMoneyCommand command) {if (balance < command.amount()) {throw new InsufficientBalanceException();}apply(new MoneyWithdrawnEvent(command.accountId(), command.amount()));}@EventSourcingHandlerpublic void on(AccountCreatedEvent event) {this.accountId = event.accountId();this.balance = event.initialBalance();}@EventSourcingHandlerpublic void on(MoneyDepositedEvent event) {balance += event.amount();}@EventSourcingHandlerpublic void on(MoneyWithdrawnEvent event) {balance -= event.amount();}
}

4. 创建Query处理

@Service
public class AccountQueryService {private final Map<String, Integer> accounts = new ConcurrentHashMap<>();@EventHandlerpublic void on(AccountCreatedEvent event) {accounts.put(event.accountId(), event.initialBalance());}@EventHandlerpublic void on(MoneyDepositedEvent event) {accounts.computeIfPresent(event.accountId(), (k, v) -> v + event.amount());}@EventHandlerpublic void on(MoneyWithdrawnEvent event) {accounts.computeIfPresent(event.accountId(), (k, v) -> v - event.amount());}@QueryHandlerpublic Integer handle(GetBalanceQuery query) {return accounts.get(query.accountId());}
}

5. 创建REST接口

@RestController
@RequestMapping("/accounts")
@RequiredArgsConstructor
public class AccountController {private final CommandGateway commandGateway;private final QueryGateway queryGateway;@PostMappingpublic CompletableFuture<String> createAccount(@RequestBody CreateAccountRequest request) {return commandGateway.send(new CreateAccountCommand(UUID.randomUUID().toString(),request.initialBalance()));}@GetMapping("/{accountId}/balance")public CompletableFuture<Integer> getBalance(@PathVariable String accountId) {return queryGateway.query(new GetBalanceQuery(accountId), Integer.class);}
}

运行与测试

启动Spring Boot应用
使用curl测试：

# 创建账户
curl -X POST -H "Content-Type: application/json" -d '{"initialBalance":1000}' http://localhost:8080/accounts# 查询余额（替换{accountId}）
curl http://localhost:8080/accounts/{accountId}/balance