map实现缓存

测试结果

接口地址数据库表设计参照

数据库表

ConfigPool.java

package com.alphajuns.ssm.util;

import com.alphajuns.ssm.pojo.Config;
import com.alphajuns.ssm.service.ConfigService;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ConfigPool {

    /**
     * 参数表的缓存map
     */
    private static AbstractTimeCachedObject cachedConfigPool = new AbstractTimeCachedObject(
            AbstractTimeCachedObject.CONFIG_CACHEDTIME) {
        @Override
        public Object refreshCachedObject(Object params) {
            return new HashMap<String, Config>();
        }
    };

    /**
     *
     * <p>
     * Description: 得到缓存中的对象
     * </p>
     *
     * @param enforce boolean
     * @return Map Map
     */
    @SuppressWarnings("unchecked")
    public static Map<String, Config> getCachedConfigPool(boolean enforce) {
        return (Map<String, Config>) cachedConfigPool.getCachedObject(null, enforce);
    }

    /**
     *
     * <p>
     * Description: 得到参数
     * </p>
     *
     * @param configKey String
     * @return Config Config
     */
    public static Config getGroupConfig(String group,String configKey) {
        Map<String, Config> configMap;
        configMap = getCachedConfigPool(false);
        System.out.println("获取到的map:" + System.identityHashCode(configMap));
        Config config;
        config = configMap.get(group+"."+configKey);
        if (EmptyUtil.isEmpty(config)) {
            ConfigService configService = null;
            configService = (ConfigService) com.alphajuns.ssm.util.SpringContextUtil.getBean("configServiceImpl");
            Map<String,String> map =new HashMap<String,String>();
            map.put("configGroup", group);
            map.put("configKey", configKey);
            config = configService.queryConfigByGroupKey(map);
            configMap.put(group+"."+configKey, config);
        }
        return config;
    }
    /**
     * 通过key得到值
     * @param configKey
     * @return
     */
    public static String getConfigValue(String configKey){
        String value = "";
        Config config = getGroupConfig(null,configKey);
        if(config!=null){
            value = config.getConfigValue();
        }
        return value;
    }

    /**
     * 通过group,key得到值
     * @param configKey
     * @return
     */
    public static String getConfigValue(String group, String configKey){
        String value = "";
        Config config = getGroupConfig(group,configKey);
        if(config!=null){
            value = config.getConfigValue();
        }
        return value;
    }

    public static List<Map<String,?>> getConfigsByGroup(String group){
        ConfigService configService = null;
        configService = (ConfigService) com.alphajuns.ssm.util.SpringContextUtil.getBean("configServiceImpl");
        Map<String,Object> queryConfigMap = new HashMap<String,Object>();
        queryConfigMap.put("configGroup", group);
        List<Map<String,?>> configList = configService.queryConfigListByGroup(queryConfigMap);
        return configList;
    }

}

 AbstractTimeCachedObject.java

package com.alphajuns.ssm.util;

public abstract class AbstractTimeCachedObject {
    /**
     *
     */
    private static final long MILLS_PER_MINTUE = 60 * 1000;
    /**
     * CONFIG_CACHEDTIME
     */
    public static final int CONFIG_CACHEDTIME = 30;
    /**
     *
     */
    protected long cachedMinutes = 5L;
    /**
     *
     */
    private long expiredTimeSlot = 0;
    /**
     *
     */
    private Object cachedObject = null;

    /**
     * <p>Description: AbstractTimeCachedObject</p>
     */
    public AbstractTimeCachedObject() {
    }

    /**
     * <p>Description: AbstractTimeCachedObject</p>
     * @param minutes minutes
     */
    public AbstractTimeCachedObject(int minutes) {
        this.cachedMinutes = minutes;
    }

    public final boolean isExpired() {
        return (System.currentTimeMillis() > this.expiredTimeSlot);
    }

    /**
     * <p>Description: getCachedObject</p>
     * @param params params
     * @param enforce enforce
     * @return Object
     */
    public final synchronized Object getCachedObject(Object params, boolean enforce) {
        if (enforce || isExpired()) {
            setCachedObject(refreshCachedObject(params));
        }

        return this.cachedObject;
    }

    /**
     * <p>Description: getCachedObject</p>
     * @param params params
     * @return Object
     */
    public final Object getCachedObject(Object params) {
        return getCachedObject(params, false);
    }

    /**
     * <p>Description: setCachedObject</p>
     * @param cachedObject cachedObject
     */
    public final void setCachedObject(Object cachedObject) {
        this.cachedObject = cachedObject;
        this.expiredTimeSlot = System.currentTimeMillis() + this.cachedMinutes * MILLS_PER_MINTUE;
    }

    /**
     * <p>Description: refreshCachedObject</p>
     * @param params params
     * @return Object
     */
    public abstract Object refreshCachedObject(Object params);
}

 Config.java

package com.alphajuns.ssm.pojo;

public class Config {

    private String configGroup;
    /**
     * 参数键
     */
    private String configKey;

    /**
     * 参数值
     */
    private String configValue;

    /**
     * 描述
     */
    private String description;

    /**
     *
     * <p>
     * 总数: TODO
     * </p>
     *
     */
    private int total;

    public String getConfigKey() {
        return this.configKey;
    }
    public void setConfigKey(String configKey) {
        this.configKey = configKey;
    }
    public String getConfigValue() {
        return this.configValue;
    }
    public void setConfigValue(String configValue) {
        this.configValue = configValue;
    }
    public String getDescription() {
        return this.description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    public int getTotal() {
        return this.total;
    }
    public void setTotal(int total) {
        this.total = total;
    }
    public String getConfigGroup() {
        return configGroup;
    }
    public void setConfigGroup(String configGroup) {
        this.configGroup = configGroup;
    }
    public String toString(){
        return "group:"+this.configGroup+",key:"+this.configKey+",value:"+this.configValue;
    }

}

 ConfigService.java

package com.alphajuns.ssm.service;

import com.alphajuns.ssm.pojo.Config;

import java.util.List;
import java.util.Map;

public interface ConfigService {

    /**
     * search key
     * @param configKey
     * @return
     */
    public Config queryConfigByKey(String configKey);
    /**
     * 通过group 和key搜索
     * @param queryConfigMap
     * @return
     */
    public Config queryConfigByGroupKey(Map<String,?> queryConfigMap);
    /**
     * queryConfigListByGroup
     * @param queryConfigMap
     * @return
     */
    public List<Map<String,?>> queryConfigListByGroup(Map<String,?> queryConfigMap);

    /**
     *
     * @Description 查询二期
     * @author fanj
     * @date 2019年11月20日
     * @param queryConfigMap
     * @return
     */
    public List<Map<String,?>> queryTpmeConfigListByGroup(Map<String,?> queryConfigMap);

}

 ConfigServiceImpl.java

package com.alphajuns.ssm.service.impl;

import com.alphajuns.ssm.mybatis.ConfigMapper;
import com.alphajuns.ssm.pojo.Config;
import com.alphajuns.ssm.service.ConfigService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;

@Service
public class ConfigServiceImpl implements ConfigService {

    @Autowired
    private ConfigMapper configMapper;


    @Override
    public Config queryConfigByKey(String configKey) {
        // TODO Auto-generated method stub
        return configMapper.queryConfigByKey(configKey);
    }

    public Config queryConfigByGroupKey(Map<String,?> queryConfigMap){
        return configMapper.queryConfigByGroupKey(queryConfigMap);
    }

    public List<Map<String,?>> queryConfigListByGroup(Map<String,?> queryConfigMap){
        return configMapper.queryConfigListByGroup(queryConfigMap);
    }

    @Override
    public List<Map<String, ?>> queryTpmeConfigListByGroup(Map<String, ?> queryConfigMap) {
        return configMapper.queryTpmeConfigListByGroup(queryConfigMap);
    }

}

 ConfigMapper.java

package com.alphajuns.ssm.mybatis;

import com.alphajuns.ssm.pojo.Config;
import org.apache.ibatis.annotations.Param;

import java.util.List;
import java.util.Map;

public interface ConfigMapper {

    public abstract Config queryConfigByKey(@Param("configKey") String configKey);

    public abstract Config queryConfigByGroupKey(Map<String,?> queryConfigMap);

    public abstract List<Map<String,?>> queryConfigListByGroup(Map<String,?> queryConfigMap);

    public abstract List<Map<String, ?>> queryTpmeConfigListByGroup(Map<String, ?> queryConfigMap);

}

 ConfigMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.alphajuns.ssm.mybatis.ConfigMapper" >
    <resultMap id="BaseResultMap" type="com.alphajuns.ssm.pojo.Config" >
        <id column="config_key" property="configKey" jdbcType="VARCHAR" />
        <result column="config_group" property="configGroup" jdbcType="VARCHAR" />
        <result column="config_value" property="configValue" jdbcType="VARCHAR" />
        <result column="description" property="description" jdbcType="VARCHAR" />
    </resultMap>
    <select id="queryConfigByKey" resultMap="BaseResultMap" parameterType="java.lang.String" >
    select T.config_key,
           T.config_value,
           T.description
      from CONFIG T
    where  t.config_key = #{configKey,jdbcType=VARCHAR}
  </select>
    <select id="queryConfigByGroupKey" resultMap="BaseResultMap" parameterType="map" >
        select T.config_key,
        T.config_value,
        T.config_group,
        T.description
        from CONFIG T
        where  t.config_key = #{configKey,jdbcType=VARCHAR}
        <choose>
            <when test="configGroup!=null and configGroup!=''">
                and T.config_group=#{configGroup,jdbcType=VARCHAR}
            </when>
            <otherwise>
                and t.config_group is null or t.config_group=''
            </otherwise>
        </choose>
    </select>

    <select id="queryConfigListByGroup" resultType="map" parameterType="java.lang.String" >
    select T.config_group,
           T.config_key,
           T.config_value,
           T.description
      from CONFIG T
    where  t.config_group = #{configGroup,jdbcType=VARCHAR}
  </select>

    <select id="queryTpmeConfigListByGroup" resultType="map" parameterType="java.lang.String" >
        select T.config_group,
        T.config_key,
        T.config_value,
        T.description
        <!-- 这里查询配置，拼接一个config_key、config_value返回 fanj 20191120 -->
        ,
        (T.config_value||T.config_key) AS CONFIG_VALUE_AND_CONFIG_KEY
        from CONFIG T
        where  t.config_group = #{configGroup,jdbcType=VARCHAR}
    </select>
</mapper>