springboot~hazelcast缓存中间件

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<UserInfo> fetchAllUsers();

  List<UserInfo> 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<UserInfo> fetchAllUsers(){
List<UserInfo> 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<UserInfo> fetchAllUsers(String name) {
List<UserInfo> 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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