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

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									<?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。

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									@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

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									@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：

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									<?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

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									# application.yml

									spring:

									 hazelcast:

									  config: classpath:config/hazelcast.xml

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									# application.properties

									spring.hazelcast.config=classpath:config/hazelcast.xml

5. 访问controller

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									@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.

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									@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/

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/zhongzunfa/article/details/80551753