Spring Boot Hazelcast Caching 使用和配置详解

本文将展示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')”)

本文参考地址： https://memorynotfound.com/spring-boot-hazelcast-caching-example-configuration/

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