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Axon Framework是一个用于构建CQRS#xff08;命令查询职责分离#xff09;和事件溯源#xff08;Event Sourcing#xff09;应用的框架#xff0…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
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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 17Spring Boot 3.2Axon Framework 4.9Maven/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 WebLombok可选
2. 添加Axon依赖
!-- pom.xml --
dependencygroupIdorg.axonframework/groupIdartifactIdaxon-spring-boot-starter/artifactIdversion4.9.0/version
/dependency3. 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 MapString, 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 CompletableFutureString createAccount(RequestBody CreateAccountRequest request) {return commandGateway.send(new CreateAccountCommand(UUID.randomUUID().toString(),request.initialBalance()));}GetMapping(/{accountId}/balance)public CompletableFutureInteger 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关键配置说明
序列化配置建议使用Jackson进行JSON序列化事件存储默认使用内存存储生产环境可配置JPA或JDBC分布式处理通过axon-distributed-command-bus实现命令总线扩展 扩展方向
添加JPA事件存储集成Spring Security进行权限控制配置Saga实现复杂事务使用Axon Server进行集群管理 通过本教程您已完成了一个基础的CQRS/ES系统实现。建议通过Axon Dashboard监控事件流并逐步添加更复杂的业务逻辑。
