springboot hazelcast缓存中间件的实例代码

作者：袖梨 2022-11-14

缓存来了

在dotnet平台有自己的缓存框架，在java springboot里当然了集成了很多，而且缓存的中间件也可以进行多种选择，向 redis , hazelcast 都是分布式的缓存中间件，今天主要说一下后者的实现。

添加依赖包 

dependencies {
  compile("org.springframework.boot:spring-boot-starter-cache")
  compile("com.hazelcast:hazelcast:3.7.4")
  compile("com.hazelcast:hazelcast-spring:3.7.4")
}
bootRun {  systemProperty "spring.profiles.active", "hazelcast-cache"
}

config统一配置 

@Configuration
@Profile("hazelcast-cache")//运行环境名称
public class HazelcastCacheConfig {
 @Bean
 public Config hazelCastConfig() {
  Config config = new Config();
  config.setInstanceName("hazelcast-cache");
  MapConfig allUsersCache = new MapConfig();
  allUsersCache.setTimeToLiveSeconds(3600);
  allUsersCache.setEvictionPolicy(EvictionPolicy.LFU);
  config.getMapConfigs().put("alluserscache", allUsersCache);
  MapConfig usercache = new MapConfig();
  usercache.setTimeToLiveSeconds(3600);//超时时间为1小时
  usercache.setEvictionPolicy(EvictionPolicy.LFU);
  config.getMapConfigs().put("usercache", usercache);//usercache为缓存的cachename
  return config;
 }
}

添加仓储 

public interface UserRepository {
 List fetchAllUsers();
 List fetchAllUsers(String name);
}
@Repository
@Profile("hazelcast-cache")// 指定在这个hazelcast-cache环境下，UserRepository的实例才是UserInfoRepositoryHazelcast
public class UserInfoRepositoryHazelcast implements UserRepository {
 @Override
 @Cacheable(cacheNames = "usercache", key = "#root.methodName")// 无参的方法，方法名作为key
 public List fetchAllUsers(){
  List list = new ArrayList<>();
  list.add(UserInfo.builder().phone("135").userName("zzl1").createAt(LocalDateTime.now()).build());
  list.add(UserInfo.builder().phone("136").userName("zzl2").createAt(LocalDateTime.now()).build());
  return list;
 }
 @Override
 @Cacheable(cacheNames = "usercache", key = "{#name}") // 方法名和参数组合做为key
 public List fetchAllUsers(String name) {
  List list = new ArrayList<>();
  list.add(UserInfo.builder().phone("135").userName("zzl1").createAt(LocalDateTime.now()).build());
  list.add(UserInfo.builder().phone("136").userName("zzl2").createAt(LocalDateTime.now()).build());
  return list;
 }
}

配置profile

application.yml开启这个缓存的环境

profiles.active: hazelcast-cache

运行程序

可以在单元测试里进行测试，调用多次，方法体只进入一次，这就是缓存成功了。 

@ActiveProfiles("hazelcast-cache")
public class UserControllerTest extends BaseControllerTest {
 @Test
 public void fetchUsers() {
  getOk();
  //test caching
  getOk();
 }
 private WebTestClient.ResponseSpec getOk() {
  return http.get()
    .uri("/users/all/zzl")
    .exchange()
    .expectStatus().isOk();
 }
}

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