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();
}
}
