小编给大家分享一下Spring Boot Hazelcast Caching怎么用，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
spring boot 结合 Hazelcast 的缓存使用案例。
1. Project Structure
2. Maven Dependencies
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.zzf</groupId> <artifactId>spring-boot-hazelcast</artifactId> <version>1.0-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> </parent> <dependencies> <!-- spring boot --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- hazelcast jar --> <dependency> <groupId>com.hazelcast</groupId> <artifactId>hazelcast-all</artifactId> <version>3.10.1</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
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：
<?xml version="1.0" encoding="UTF-8"?> <hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config http://www.hazelcast.com/schema/config/hazelcast-config.xsd" xmlns="http://www.hazelcast.com/schema/config" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <map name="instruments"> <max-size>200</max-size> <eviction-policy>LFU</eviction-policy> <time-to-live-seconds>20</time-to-live-seconds> </map> </hazelcast>
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')”)
以上是“Spring Boot Hazelcast Caching怎么用”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注亿速云行业资讯频道！
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