12 changed files with 511 additions and 356 deletions
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package com.mh.user.config; |
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import com.github.benmanes.caffeine.cache.*; |
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import org.springframework.context.annotation.Bean; |
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import org.springframework.context.annotation.Configuration; |
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import java.util.concurrent.TimeUnit; |
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/** |
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* @author LJF |
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* @title ： |
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* @description 使用caffeine缓存技术 |
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* @updateTime 2020-12-15 |
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* @throws ： |
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*/ |
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@Configuration |
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public class CaffeineCacheConfig { |
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// 软引用： 如果一个对象只具有软引用，则内存空间足够，垃圾回收器就不会回收它；如果内存空间不足了，就会回收这些对象的内存。
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// 弱引用： 弱引用的对象拥有更短暂的生命周期。在垃圾回收器线程扫描它所管辖的内存区域的过程中，一旦发现了只具有弱引用的对象，
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// 不管当前内存空间足够与否，都会回收它的内存
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@Bean(name = "caffeineCache") |
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public Cache<String, Object> caffeineCache() { |
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return Caffeine.newBuilder() |
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// 软引用
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.softValues() |
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// 弱引用
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// .weakValues()
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// 设置最后一次写入或访问后经过固定时间过期
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.expireAfterWrite(8*60*60, TimeUnit.SECONDS) |
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// 初始的缓存空间大小
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.initialCapacity(100) |
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// 缓存的最大条数
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.maximumSize(1000) |
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.build(); |
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} |
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//定义缓存,可直接使用
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@Bean |
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public LoadingCache expiryCache(){ |
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LoadingCache<String, Object> loadingCache = Caffeine.newBuilder() |
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.initialCapacity(100) |
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.maximumSize(1000) |
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//缓存写入/删除监控
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.writer(new CacheWriter<Object, Object>() { |
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@Override |
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public void write(Object key, Object value) { //此方法是同步阻塞的
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System.out.println("--缓存写入--:key=" + key + ", value=" + value); |
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} |
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@Override |
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public void delete(Object key, Object value, RemovalCause cause) { System.out.println("--缓存删除--:key=" + key); } |
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}) |
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.expireAfterAccess(6, TimeUnit.HOURS) //过期时间
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.build((String key)->"刷新的数据"); //cacheload实现类,刷新时候调用
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// loadingCache.put("name","侯征");
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return loadingCache; |
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} |
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} |
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package com.mh.user.utils; |
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import com.alibaba.fastjson2.JSONArray; |
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import com.alibaba.fastjson2.JSONObject; |
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import com.github.benmanes.caffeine.cache.Cache; |
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import com.mh.user.constants.Constant; |
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import com.mh.user.entity.ChillersEntity; |
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import com.mh.user.entity.DeviceCodeParamEntity; |
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import com.mh.user.service.DeviceCodeParamService; |
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import org.springframework.context.ApplicationContext; |
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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/** |
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* @Classname CacheUtil |
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* Todo: 缓存工具类 |
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* @Date 2021-11-21 10:03 |
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* @Created by LJF |
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*/ |
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public class CacheUtil { |
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// 调用service
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ApplicationContext context = SpringBeanUtil.getApplicationContext(); |
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Cache caffeineCache = (Cache) context.getBean("caffeineCache"); |
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DeviceCodeParamService deviceCodeParamService = context.getBean(DeviceCodeParamService.class); |
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private static class SingletonHolder{ |
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private static final CacheUtil instance=new CacheUtil(); |
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} |
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private CacheUtil(){ |
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createDeviceParams(); |
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} |
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public static CacheUtil getInstance(){ |
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return SingletonHolder.instance; |
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} |
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/** |
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* 把采集ddc设置的报文存入到缓存中 |
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*/ |
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private void createDeviceParams() { |
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// 缓存压变、温控
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if (caffeineCache.getIfPresent("1") == null) { |
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List<DeviceCodeParamEntity> deviceCodeParamEntities = deviceCodeParamService.queryCodeParam3(null); |
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caffeineCache.put("1", deviceCodeParamEntities); |
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} |
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// 缓存水、电表、状态检测
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if (caffeineCache.getIfPresent("2") == null) { |
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List<DeviceCodeParamEntity> deviceCodeParam2Entities = deviceCodeParamService.queryCodeParam4(null); |
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caffeineCache.put("2", deviceCodeParam2Entities); |
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} |
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// 水位开关
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if (caffeineCache.getIfPresent("3") == null) { |
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List<DeviceCodeParamEntity> deviceCodeParam3Entities = deviceCodeParamService.queryCodeParam5(null); |
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caffeineCache.put("3", deviceCodeParam3Entities); |
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} |
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} |
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/** |
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* 通过发生类型获取发生的报文集合(返回List类型) |
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* @param type |
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* @return |
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*/ |
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public List<DeviceCodeParamEntity> getDeviceParamsByType(String type) { |
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Object cacheObject = caffeineCache.getIfPresent(type); |
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// 如果为空，重新添加
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if (cacheObject == null) { |
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createDeviceParams(); |
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// 在重新获取数据
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cacheObject = caffeineCache.getIfPresent(type); |
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} |
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return JSONArray.parseArray(JSONObject.toJSONString(cacheObject), DeviceCodeParamEntity.class); |
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} |
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} |
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