spring boot: 本地缓存

1.     场景：初始化系统，自动加载错误码到本地缓存

1.     缓存类（tcloud-common-api/ SysErrorCodeMappingCache）

package com.svw.tbox.tcloud.commons.cache;   import java.util.ArrayList; import java.util.List; import com.svw.tbox.tcloud.commons.api.entity.SysErrorCodeMapping;   /**  * @Title ClassName: SysErrorCodeMappingCache  * @Description Description: 错误码缓存类  * @Author Author: 胡锐锋  * @Date Date: 2017年12月22日  */ publicclass SysErrorCodeMappingCache {         private SysErrorCodeMappingCache() {        super();     }       privatestatic List sysErrorCodeMappings = new ArrayList<>();       publicstatic List getSysErrorCodeMappings() {        returnsysErrorCodeMappings;     }       publicstaticvoid setSysErrorCodeMappings(List sysErrorCodeMappings) {        SysErrorCodeMappingCache.sysErrorCodeMappings = sysErrorCodeMappings;     } }

 

2.     监听器(tcloud-mds/ SysErrorCodeLoadListener)

package com.svw.tbox.tcloud.mds.listener;   import java.util.List; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import javax.servlet.annotation.WebListener; import org.springframework.beans.factory.annotation.Autowired; import com.svw.tbox.tcloud.commons.api.entity.SysErrorCodeMapping; import com.svw.tbox.tcloud.commons.cache.SysErrorCodeMappingCache; import com.svw.tbox.tcloud.mds.feign.SysErrorCodeMappingFeign;   /**  * @Title ClassName: SysErrorCodeLoadListener  * @Description Description: 错误码缓存实现  * @Author Author: 胡锐锋  * @Date Date: 2017年12月22日  */ @WebListener publicclass SysErrorCodeLoadListener implements ServletContextListener {     @Autowired     private SysErrorCodeMappingFeign sysErrorCodeMappingFeign;       @SuppressWarnings("unchecked")     @Override     publicvoid contextInitialized(ServletContextEvent sce) {        // 加载redis中的缓存错误码        List sysErrorCodeMappings = (List) sysErrorCodeMappingFeign.queryAll()               .getData();         SysErrorCodeMappingCache.setSysErrorCodeMappings(sysErrorCodeMappings);     }       @Override     publicvoid contextDestroyed(ServletContextEvent sce) {        // 监听销毁时执行     } }

 

3.     开启监听器扫描

@SpringBootApplication @EnableHystrix @EnableDiscoveryClient @EnableFeignClients @MapperScan(basePackages = "com.svw.tbox.tcloud.mds.dao") @ServletComponentScan publicclass MdsApplication {……

 

4.     刷新缓存设置

package com.svw.tbox.tcloud.mds.controller;   import java.util.List;   import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController;   import com.svw.tbox.tcloud.commons.api.entity.SysErrorCodeMapping; import com.svw.tbox.tcloud.commons.cache.SysErrorCodeMappingCache; import com.svw.tbox.tcloud.commons.web.Result; import com.svw.tbox.tcloud.commons.web.SystemResponse; import com.svw.tbox.tcloud.mds.feign.SysErrorCodeMappingFeign;   import io.swagger.annotations.Api; import io.swagger.annotations.ApiOperation;   /**  * @Title ClassName: SysErrorCodeMappingController  * @Description Description: 本地缓存操作类  * @Author Author: 胡锐锋  * @Date Date: 2017年12月22日  */ @RestController @Api(description = "本地缓存服务") @RequestMapping("/localCache") publicclass LocalCacheController {     @Autowired     private SysErrorCodeMappingFeign sysErrorCodeMappingFeign;       @SuppressWarnings("unchecked")     @ApiOperation(value = "刷新错误码本地缓存")     @RequestMapping(value = "/refreshSysErrorCodeMapping", method = RequestMethod.GET)     public SystemResponse refreshSysErrorCodeMapping() {        SysErrorCodeMappingCache.clear();        List sysErrorCodeMappingList = (List) sysErrorCodeMappingFeign               .queryAll().getData();         SysErrorCodeMappingCache.setSysErrorCodeMappings(sysErrorCodeMappingList);        return Result.success(sysErrorCodeMappingList);     } }

2.     场景：懒加载，小缓存，定时刷新

使用GuavaCache

1.     添加依赖

<dependency>            <groupId>com.google.guavagroupId>            <artifactId>guavaartifactId>        dependency>

2.     使用LoadingCache

//TODO 目前项目没用到