SpringBootHazelcastCaching怎么用
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spring boot 结合 Hazelcast 的缓存使用案例。
1. Project Structure
2. Maven Dependencies
4.0.0 com.zzf spring-boot-hazelcast 1.0-SNAPSHOT org.springframework.boot spring-boot-starter-parent 2.0.1.RELEASE org.springframework.boot spring-boot-starter-cache org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-starter-web com.hazelcast hazelcast-all 3.10.1 org.springframework.boot spring-boot-maven-plugin
3. Hazelcast Caching Service
通过使用
@cachable注释来注释play方法,将缓存后续调用的结果。
@CacheEvict(allEntries=true)清除缓存中的所有条目。
@CacheConfig(cachenames=”instruments”)注册了带有指定缓存的spring框架缓存注释的所有方法。
@Service @CacheConfig(cacheNames = "instruments") public class MusicService { private static Logger log = LoggerFactory.getLogger(MusicService.class); @CacheEvict(allEntries = true) public void clearCache(){} // 表示的是属性为 trombone 就进行缓存 @Cacheable(condition = "#instrument.equals('trombone')") public String play(String instrument){ log.info("Executing: " + this.getClass().getSimpleName() + ".play(\"" + instrument + "\");"); return "playing " + instrument + "!"; } }
4. Hazelcast Caching Configuration
如果类路径下存在hazelcast, spring boot 将会自动创建Hazelcast 的实例。
下面将介绍两种加载的方式:
使用java 配置的方式
使用hazelcast.xml XML 的配置
4.1 Hazelcast Java Configuration
@Configuration public class HazelcastConfiguration { @Bean public Config hazelcastConfig(){ return new Config().setInstanceName("hazelcast-instance") .addMapConfig( new MapConfig() .setName("instruments") .setMaxSizeConfig(new MaxSizeConfig(200, MaxSizeConfig.MaxSizePolicy.FREE_HEAP_SIZE)) .setEvictionPolicy(EvictionPolicy.LRU) .setTimeToLiveSeconds(20) ); } }
4.2 Hazelcast XML Configuration
可以使用xml 配置 Hazelcast , 在src/main/resources 添加一个文件hazelcast.xml
spring boot 将会自动注入配置文件, 当然也可以指定路径路径, 使用属性spring.hazelcast.config 配置在yml 或者properties 文件中, 例如下面所示:
具体的application.properties 和 application.yml 文件显示
# application.yml spring: hazelcast: config: classpath:config/hazelcast.xml
# application.properties spring.hazelcast.config=classpath:config/hazelcast.xml
5. 访问controller
@Controller public class HazelcastController { private Logger logger = LoggerFactory.getLogger(HazelcastController.class); @Autowired private MusicService musicService; @Autowired private CacheManager cacheManager; @RequestMapping("/hezelcast") @ResponseBody public void getHazelcast(){ logger.info("Spring Boot Hazelcast Caching Example Configuration"); logger.info("Using cache manager: " + cacheManager.getClass().getName()); // 清空缓存 musicService.clearCache(); // 调用方法 play("trombone"); play("guitar"); play("trombone"); play("guitar"); play("bass"); play("trombone"); } private void play(String instrument){ logger.info("Calling: " + MusicService.class.getSimpleName() + ".play(\"" + instrument + "\");"); musicService.play(instrument); } }
6. Bootstrap Hazelcast Caching Application
使用注解@EnableCaching 开启缓存机制.
@EnableCaching @SpringBootApplication public class HazelcastApplication{ private Logger logger = LoggerFactory.getLogger(HazelcastApplication.class); public static void main(String[] args) { SpringApplication.run(HazelcastApplication.class, args); } }
7. 访问和解释
2018-06-02 22:15:18.488 INFO 41728 --- [nio-8080-exec-4] c.h.i.p.impl.PartitionStateManager : [192.168.1.1]:5701 [dev] [3.10.1] Initializing cluster partition table arrangement...
2018-06-02 22:15:18.521 INFO 41728 --- [nio-8080-exec-4] c.z.s.h.controller.HazelcastController : Calling: MusicService.play("trombone");
2018-06-02 22:15:18.558 INFO 41728 --- [nio-8080-exec-4] c.z.s.hazelcast.service.MusicService : Executing: MusicService.play("trombone");
2018-06-02 22:15:18.563 INFO 41728 --- [nio-8080-exec-4] c.z.s.h.controller.HazelcastController : Calling: MusicService.play("guitar");
2018-06-02 22:15:18.563 INFO 41728 --- [nio-8080-exec-4] c.z.s.hazelcast.service.MusicService : Executing: MusicService.play("guitar");
2018-06-02 22:15:18.563 INFO 41728 --- [nio-8080-exec-4] c.z.s.h.controller.HazelcastController : Calling: MusicService.play("trombone");
2018-06-02 22:15:18.564 INFO 41728 --- [nio-8080-exec-4] c.z.s.h.controller.HazelcastController : Calling: MusicService.play("guitar");
2018-06-02 22:15:18.565 INFO 41728 --- [nio-8080-exec-4] c.z.s.hazelcast.service.MusicService : Executing: MusicService.play("guitar");
2018-06-02 22:15:18.565 INFO 41728 --- [nio-8080-exec-4] c.z.s.h.controller.HazelcastController : Calling: MusicService.play("bass");
2018-06-02 22:15:18.565 INFO 41728 --- [nio-8080-exec-4] c.z.s.hazelcast.service.MusicService : Executing: MusicService.play("bass");
2018-06-02 22:15:18.566 INFO 41728 --- [nio-8080-exec-4] c.z.s.h.controller.HazelcastController : Calling: MusicService.play("trombone");
从上面的可以看到 只有trombone , 才会直接访问缓存信息, 正是在MusicService 类中的方法play 上时候注解进行过滤:
@Cacheable(condition = “#instrument.equals(‘trombone')”)
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