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springboot GuavaCache缓存 springboot使用GuavaCache做简单缓存处理的方法

qianggetaba 人气:0

问题背景

实际项目碰到一个上游服务商接口有10秒的查询限制(同个账号)。

项目中有一个需求是要实时统计一些数据,一个应用下可能有多个相同的账号。由于服务商接口的限制,当批量查询时,可能出现同一个账号第一次查询有数据,但第二次查询无数据的情况。

解决方案

基于以上问题,提出用缓存的过期时间来解决。

这时,可用Redis和Guava Cache来解决:

当批量查询时,同一个账号第一次查询有数据则缓存并设置过期时间10s, 后续查询时直接从缓存中取,没有再从服务商查询。

最终采用Guava Cache来解决,原因是:

使用GuavaCache可以快速建立缓存

1.需要在启动类上注解@EnableCaching
2.配置CacheManager
3.控制器上注解使用@Cacheable

pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>4.3.9.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>18.0</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
    </plugins>
  </build>

CacheConfig.java 配置类

package application.config;

import com.google.common.cache.CacheBuilder;
import org.springframework.cache.CacheManager;
import org.springframework.cache.guava.GuavaCache;
import org.springframework.cache.support.SimpleCacheManager;
import org.springframework.context.annotation.Configuration;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

@Configuration
public class CacheConfig {

  public CacheManager cacheManager(){
    GuavaCache guavaCache = new GuavaCache("GuavaCacheAll", CacheBuilder.newBuilder()
    .recordStats()
    .expireAfterWrite(10000, TimeUnit.SECONDS)
    .build());

    List list = new ArrayList();
    list.add(guavaCache);
    SimpleCacheManager simpleCacheManager = new SimpleCacheManager();
    simpleCacheManager.setCaches(list);
    return simpleCacheManager;
  }
}

TestController.java 控制器测试类

package application.controller;

import org.springframework.cache.annotation.Cacheable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class TestController {

  @RequestMapping("/test")
  //key是使用spEl取得参数,根据参数name作为缓存的key,value是使用的缓存list中的那个,具体看配置类
  @Cacheable(value = "GuavaCacheAll",key = "#name")
  public String tt(String name){
    System.out.println("in tt");
    return "name:"+name;
  }
}

Application.java springboot启动类

package application;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;

@SpringBootApplication
@EnableCaching
public class Application {
  public static void main(String[] args) {
    SpringApplication.run(Application.class,args);
  }
}

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