init: initialization project

.gitignore

+# Created by .ignore support plugin (hsz.mobi)
+### Java template
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+.idea
+*.iml
+*.ipr
+*.iws
+
+.gradle
+build
+

README.md

+# 蛋壳创意科技--技术分享--缓存
+
+## 缓存的概念
+
+### 外存
+
+> ​		外储存器是指除计算机内存及CPU 缓存以外的储存器，此类储存器一般断电后仍然能保存数据。
+> 常见的外存储器有硬盘、软盘、光盘、U 盘等，一般的软件都是安装在外存中（windows系统指的是CDEF 盘, Linux 系统指的是挂载点）。
+
+### 内存
+
+> ​		内存是计算机中重要的部件之一，它是与CPU 进行沟通的桥梁。计算机中所有程序的
+> 运行都是在内存中进行的，因此内存的性能对计算机的影响非常大。
+> ​		内存(Memory)也被称为内存储器，其作用是用于暂时存放CPU 中的运算数据，以及与硬盘等外部存储器交换的数据。只要计算机在运行中，CPU 就会把需要运算的数据调到内存中进行运算，当运算完成后CPU 再将结果传送出来，内存的运行也决定了计算机的稳定运行，此类储存器一般断电后数据就会被清空。
+
+### 缓存
+
+> ​		缓存就是把一些外存上的数据保存到内存上而已，怎么保存到内存上呢，我们运行的所有程序，里面的变量值都是放在内存上的，所以说如果要想使一个值放到内存上，实质就是在获得这个变量之后，用一个生存期较长的变量存放你想存放的值，在java中一些缓存一般都是通过map 集合来做的。
+>
+> ​		广义的缓存是把一些慢存（较慢的外存）上的数据保存到快存（较快的存储）上，简单讲就是，如果某些资源或者数据会被频繁的使用，而这些资源或数据存储在系统外部，比如数据库、硬盘文件等，那么每次操作这些数据的时候都从数据库或者硬盘上去获取，速度会很慢，会造成性能问题（系统停工待料）。于是我们把这些数据冗余一份到快存里面，每次操作的时候，先到快存里面找，看有没有这些数据，如果有，那么就直接使用，如果没有那么就获取它，并复制一份到快存中，下一次访问的时候就可以直接从快存中获取。从而节省大量的时间，可以看出，缓存是一种典型的空间换时间的方案。
+>
+> > 生活中这样的例子处处可见，举例：
+> >
+> > - 举例1 --CPU--L1/L2--内存--磁盘
+> >   CPU 需要数据时先从L1/L2 中读取，如果没有到内存中找，如果还没有会到磁盘上找。
+> > -  举例2 --Maven
+> >   还有如用过Maven 的朋友都应该知道，我们找依赖的时候，先从本机仓库找，再从本地服务器仓库找，最后到远程仓库服务器找。
+> > - 举例3 --京东仓储
+> >   还有如京东的物流为什么那么快？他们在各个地都有分仓库，如果该仓库有货物那么送货的速度是非常快的。
+> > -  举例4 --数据库中的索引，也是以空间换取时间，缓存也是以空间换取时间。
+
+#### 缓存的重要指标
+
+##### 缓存命中率
+
+> 表明缓存是否运行良好的
+> 即【从缓存中读取数据的次数】与【总读取次数】的比率，命中率越高越好：
+>
+> ###### 缓存命中率
+>
+> > 命中率= `从缓存中读取次数`/ (`总读取次数`[==从缓存中读取次数==+ ==从慢速设备上读取
+> > 的次数==])
+>
+> ###### 缓存MISS率
+>
+> > Miss 率= `没有从缓存中读取的次数`/ (`总读取次数`[==从缓存中读取次数==+ ==从慢速设备
+> > 上读取的次数==])
+>
+> 这是一个非常重要的监控指标，如果做缓存一定要健康这个指标来看缓存是否工作良好
+
+##### 缓存移除策略
+
+> 不同的移除策略实际上看的是不同的指标
+> 即如果缓存满了，从缓存中移除数据的策略；常见的有LFU、LRU、FIFO：
+>
+> ###### FIFO : `First In First Out`
+>
+> > 先进先出算法，即先放入缓存的先被移除
+>
+> ###### LRU: `Least Recently Used`
+>
+> > 久未使用算法，使用时间距离现在最久的那个被移除
+>
+> ###### LFU: `Least Frequently Used`
+>
+> > 最近最少使用算法，一定时间段内使用次数（频率）最少的那个被移除
+>
+> ###### ==TTL: `Time To Live`==
+>
+> > 存活期，即从缓存中创建时间点开始直到它到期的一个时间段（不管在这个时间段内有没有访问都将过期）
+>
+> ###### TTI：Time To Idle
+>
+> > 空闲期，即一个数据多久没被访问将从缓存中移除的时间。
+>
+> <b>实际设计缓存时以上重要指标都应该考虑进去，当然根据实际需求可能有的指标并不会采用进设计去</b>
+
+## 缓存的逻辑处理流程
+
+![](https://img.mercymodest.com/public/20210326145533.png)
+
+### 代码示例
+
+language：`java`
+
+cache: `redis`
+
+```java
+    @Override
+    public Optional<Provinces> detailWithRedisCache(String provincesId) {
+        if (StrUtil.isBlank(provincesId)) {
+            return Optional.empty();
+        }
+        String key = StrUtil.format(Const.RedisKey.KEY_PATTERN_PROVINCES_DETAIL, provincesId);
+        String cache = stringRedisTemplate.opsForValue().get(key);
+        if (StrUtil.isNotBlank(cache)) {
+            if (log.isDebugEnabled()) {
+                log.debug("detailWithRedisCache  ==> {} success hit cache {}", Thread.currentThread().getName(), cache);
+            }
+            // 缓存命中
+            return gson.fromJson(cache, new TypeToken<Optional<Provinces>>() {
+            }.getType());
+        } else {
+            // 数据没有缓存
+            // TODO 缓存击穿 分布式锁  etc. Redisson
+            Provinces provinces = this.getProvincesByProvinces(provincesId);
+            Optional<Provinces> provincesOptional;
+            if (BeanUtil.isNotEmpty(provinces)) {
+                if (log.isDebugEnabled()) {
+                    log.debug("detailWithRedisCache  ==> {} success get provinces by {} from  database.", Thread.currentThread().getName(), provincesId);
+                }
+                provincesOptional = Optional.of(provinces);
+                final long timeoutInMinutes = Const.CacheTimeout.TIMEOUT_PROVINCES_DETAIL_MINUTES;
+                stringRedisTemplate.opsForValue().set(key, gson.toJson(provincesOptional), timeoutInMinutes, TimeUnit.MINUTES);
+            } else {
+                // 防止缓存穿透
+                if (log.isDebugEnabled()) {
+                    log.debug("detailWithRedisCache  ==> {} preven cache break down .", Thread.currentThread().getName());
+                }
+                final long timeoutInMinutes = Const.CacheTimeout.TIMEOUT_PROVINCES_DETAIL_MINUTES;
+                provincesOptional = Optional.empty();
+                stringRedisTemplate.opsForValue()
+                        .set(key, gson.toJson(provincesOptional), timeoutInMinutes, TimeUnit.MINUTES);
+            }
+            // 防止缓存雪崩
+            // 每一个缓存 30秒 以内的随机差距 
+            Long expire = stringRedisTemplate.getExpire(key, TimeUnit.SECONDS);
+            expire += RandomUtil.randomLong(30);
+            stringRedisTemplate.expire(key, expire, TimeUnit.SECONDS);
+            return provincesOptional;
+        }
+    }
+```
+
+## Spring Cache
+
+![](https://img.mercymodest.com/public/20210326174415.png)
+
+### `@Cacheable`
+
+> ![](https://img.mercymodest.com/public/20210326174521.png)
+
+### `@CachePut`
+
+> ![](https://img.mercymodest.com/public/20210326174556.png)
+
+### `@CacheEivct`
+
+> ![](https://img.mercymodest.com/public/20210326174630.png)
+
+![](https://img.mercymodest.com/public/20210326174746.png)
+
+### 举个小栗子
+
+#### 使用`spring cache` 的两个前提和一个自定义
+
+##### 前提一: 开启缓存
+
+`@EnableCaching`
+
+![](https://img.mercymodest.com/public/20210326175249.png)
+
+##### 前提二: 注册 `CacheManager`
+
+`org.springframework.cache.CacheManager`
+
+etc.
+
+```java
+ /**
+     * 注册一个 {@link CacheManager}
+     *
+     * @param connectionFactory {@link RedisConnectionFactory}
+     * @return  {@link CacheManager}
+     */
+    @Bean
+    public CacheManager cacheManager(RedisConnectionFactory connectionFactory) {
+        return RedisCacheManager
+                .builder(connectionFactory)
+                .cacheDefaults(
+                        RedisCacheConfiguration.defaultCacheConfig()
+                                //缓存时间绝对过期时间20s
+                                .entryTtl(Duration.ofSeconds(120)))
+                .transactionAware()
+                .build();
+    }
+```
+
+##### 可选自定义: 缓存 `key` ：`KeyGenerator`
+
+`org.springframework.cache.interceptor.KeyGenerator`
+
+etc.
+
+tips: Spring Cache 的默认 KeyGenerator 默认也是这么做滴
+
+```java
+ /**
+     * {@link Cacheable} 默认 {@link KeyGenerator}
+     *
+     * @return {@link KeyGenerator}
+     */
+    @Bean("customerKeyGenerator")
+    public KeyGenerator keyGenerator() {
+        return (Object target, Method method, Object... params) -> {
+            StringBuilder stringBuilder = new StringBuilder();
+            for (int i = 0; i < params.length; i++) {
+                stringBuilder.append(params[i]);
+            }
+            return stringBuilder.toString();
+        };
+    }
+```
+
+#### 缓存方法
+
+```java
+   @Cacheable(cacheNames = "provinces_detail_cache", keyGenerator = "customerKeyGenerator")
+    @Override
+    public Optional<Provinces> detailWithSpringCache(String provincesId) {
+        Provinces provinces = this.getProvincesByProvinces(provincesId);
+        return Optional.ofNullable(provinces);
+    }
+```
+
+#### 缓存更新方法: 直接删除缓存
+
+```java
+    @CacheEvict(cacheNames = "provinces_detail_cache", key = "#provinces.provinceId")
+    @Override
+    public Optional<Integer> updateProvinces(Provinces provinces) {
+        LambdaQueryWrapper<Provinces> provincesLambdaQueryWrapper = new LambdaQueryWrapper<Provinces>()
+                .eq(Provinces::getProvinceId, provinces.getProvinceId());
+        int update = baseMapper.update(provinces, provincesLambdaQueryWrapper);
+        return Optional.of(update);
+    }
+```
+
+#### 效果演示
+
+url: GET http://localhost:9102/test/440000
+
+##### 调用 缓存方法
+
+![](https://img.mercymodest.com/public/20210326180109.png)
+
+##### 调用 更新缓存方法
+
+![](https://img.mercymodest.com/public/20210326180401.png)
+
+## 缓存过期与数据一致性问题
+
+![](https://img.mercymodest.com/public/20210326174900.png)
+
+![](https://img.mercymodest.com/public/20210326174939.png)
+
+## 缓存击穿
+
+> ​	 在平常高并发的系统中，大量的请求同时查询一个 key 时，此时这个key正好失效了，就会导致大量的请求都打到数据库上面去。这种现象我们称为**缓存击穿**
+
+![](https://img.mercymodest.com/public/20210326182420.png)
+
+### 解决方案示例
+
+- 分布式锁： etc. `Redis 分布式锁` `Zookeepr 分布式锁` `Redisson`
+
+## 缓存穿透
+
+> ​     那么请求去查询一条压根儿数据库中根本就不存在的数据，也就是缓存和数据库都查询不到这条数据，但是请求每次都会打到数据库上面去。
+>
+> 这种查询不存在数据的现象我们称为**缓存穿透**。
+
+![](https://img.mercymodest.com/public/20210326182212.png)
+
+布隆过滤器博文参考：[Bloom Filter](https://www.cnblogs.com/z941030/p/9218356.html)
+
+#### 小示例
+
+##### 数据初始化
+
+```java
+    @PostConstruct
+    public void postConstruct() {
+        bitMapBloomFilter = new BitMapBloomFilter(10);
+        LambdaQueryWrapper<Provinces> provincesLambdaQueryWrapper = new LambdaQueryWrapper<Provinces>()
+                .select(Provinces::getProvinceId);
+        baseMapper.selectList(provincesLambdaQueryWrapper)
+                .stream()
+                .filter(Objects::nonNull)
+                .map(Provinces::getProvinceId)
+                .forEach(bitMapBloomFilter::add);
+    }
+```
+
+##### 使用 `BitMapBloomFilter` 防止缓存穿透
+
+```java
+   @Override
+    public Optional<Provinces> detailsWithBoolmFilter(String provinceId) {
+        if (StrUtil.isBlank(provinceId)) {
+            return Optional.empty();
+        }
+        if (!bitMapBloomFilter.contains(provinceId)) {
+            // provinceId 不存在
+            return Optional.empty();
+        }
+        return Optional.ofNullable(this.getProvincesByProvinces(provinceId));
+    }
+```
+
+##### 小提示
+
+> 示例 只是单纯的对 `BitMapBloomFilter`进行初数化，我们还需考虑其数据更新.我们可以在 Provinces进行增删的时候手动对 BitMapBloomFilter`进行更新。当然我们也可以通过订阅 诸如`TiDB`的`Ticdc`来实现`BitMapBloomFilter`的数据更新
+
+### 解决方案示例
+
+- 缓存空值
+
+- BloomFilter ： 布隆过滤器
+
+  ![](https://img.mercymodest.com/public/20210326182241.png)
+
+## 缓存雪崩
+
+> ​	缓存雪崩的情况是说，当某一时刻发生大规模的缓存失效的情况，比如你的缓存服务宕机了，会有大量的请求进来直接打到DB上面。结果就是DB 称不住，挂掉。
+
+![](https://img.mercymodest.com/public/20210326182354.png)
+
+### 解决方案示例
+
+- 使用集群缓存，保证缓存服务的高可用
+- 对应用服务进行限流
+- 缓存数据的时候，在原来过期时间的基础上加上一定范围的随机数
+

build.gradle

+buildscript {
+    repositories {
+        mavenLocal()
+        maven {
+            url 'https://maven.aliyun.com/repository/gradle-plugin'
+        }
+        maven {
+            url 'https://maven.aliyun.com/repository/spring-plugin'
+        }
+        mavenCentral()
+    }
+    ext {
+        set('springBootVersion', '2.4.4')
+        set('dependencyManagementPlugin', '1.0.11.RELEASE')
+    }
+    dependencies {
+        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
+        classpath("io.spring.gradle:dependency-management-plugin:${dependencyManagementPlugin}")
+    }
+
+}
+
+group 'cn.dankal.share'
+description = 'dankal-share-cache'
+version '1.0.0.RELEASE'
+
+
+apply plugin: 'java'
+apply plugin: 'idea'
+apply plugin: 'io.spring.dependency-management'
+apply plugin: 'org.springframework.boot'
+
+sourceCompatibility = '1.8'
+targetCompatibility = '1.8'
+
+
+ext {
+    //hutool
+    set('hutoolVersion', "5.6.1")
+    set('hutoolCryptoVersion', "5.6.1")
+    set('hutoolBoolmFilterVersion', "5.6.1")
+    // mybatis plus
+    set('mybatisPlusVersion', "3.4.2")
+    set('mybatisPlusGenerateVersion', "3.4.1")
+    set('velocityEngineCore', "2.3")
+    // druid spring boot
+    set('druidVersion', "1.1.22")
+
+    // fast json
+    //set('fastjsonVersion', '1.2.75')
+
+    // gson
+    set('gsonVersion','2.8.6')
+    // hibernate-validator
+    set('hibernateValidatorVersion', '6.1.7.Final')
+    // 微信小程序 Java SDK
+    set('weixinJavaMiniappVersion', '4.0.0')
+    // javax.faces.api
+    set('javaxFacesApiVersion', "2.2")
+    // redisson
+    set('redissonVersion', "3.15.2")
+    // elasticsearch version
+    set("elasticsearchVersion", "7.10.1")
+    //velocity engine core  version
+    set("velocityEngineCoreVersion", "2.0")
+}
+
+repositories {
+    mavenLocal()
+    maven {
+        url 'https://maven.aliyun.com/repository/public/'
+    }
+    maven {
+        url 'https://maven.aliyun.com/repository/spring/'
+    }
+    maven {
+        url 'http://nexus.dankal.cn/repository/tudgo-host-release'
+        credentials {
+            username = 'admin'
+            password = 'wanxe555'
+        }
+    }
+    maven {
+        url 'http://nexus.dankal.cn/repository/tudgo-host'
+        credentials {
+            username = 'admin'
+            password = 'wanxe555'
+        }
+    }
+    maven {
+        url 'https://maven.aliyun.com/repository/gradle-plugin'
+    }
+    maven {
+        url 'https://maven.aliyun.com/repository/spring-plugin'
+    }
+    mavenCentral()
+}
+tasks.withType(JavaCompile) {
+    options.encoding = "UTF-8"
+}
+dependencies {
+    //spring-boot-web
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    annotationProcessor "org.springframework.boot:spring-boot-configuration-processor"
+    // spring boot redis
+    implementation 'org.springframework.boot:spring-boot-starter-data-redis'
+    implementation 'org.apache.commons:commons-pool2'
+    compile "org.springframework.boot:spring-boot-starter-aop"
+    compileOnly "javax.faces:javax.faces-api:${javaxFacesApiVersion}"
+    implementation "org.redisson:redisson:${redissonVersion}"
+
+    // spring-boot-test
+    testImplementation('org.springframework.boot:spring-boot-starter-test')
+
+    //hibernate-validator
+    implementation "org.hibernate.validator:hibernate-validator:${hibernateValidatorVersion}"
+
+    //orm
+    implementation "com.baomidou:mybatis-plus-boot-starter:${mybatisPlusVersion}"
+    implementation "com.alibaba:druid-spring-boot-starter:${druidVersion}"
+    implementation 'mysql:mysql-connector-java'
+
+    // mybatis plus generate
+    implementation "com.baomidou:mybatis-plus-generator:${mybatisPlusGenerateVersion}"
+    implementation "org.apache.velocity:velocity-engine-core:${velocityEngineCore}"
+
+
+    // hutool -core
+    implementation "cn.hutool:hutool-core:${hutoolVersion}"
+    // hutool -crypto
+    implementation "cn.hutool:hutool-crypto:${hutoolCryptoVersion}"
+    // hutool bloomfilter
+    implementation "cn.hutool:hutool-bloomFilter:${hutoolBoolmFilterVersion}"
+
+
+    //gson
+    implementation "com.google.code.gson:gson:${gsonVersion}"
+
+    // lombok
+    compile 'org.projectlombok:lombok'
+    annotationProcessor 'org.projectlombok:lombok'
+    testCompileOnly 'org.projectlombok:lombok'
+}
+
+
+sourceSets {
+    main {
+        resources {
+            //可以将java目录下的所有非.java资源打包到classes下
+            srcDir 'src/main/java'
+        }
+    }
+}
+
+test {
+    useJUnitPlatform()
+}
+
+bootJar.enabled = true
+jar.enabled = true
+

gradle/wrapper/gradle-wrapper.properties

+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://res.mercymodest.com/gradle-6.7.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

+pluginManagement {
+    repositories {
+        mavenLocal()
+        maven { url "https://maven.aliyun.com/repository/gradle-plugin" }
+        maven { url "https://maven.aliyun.com/repository/spring-plugin" }
+        maven { url "https://maven.aliyun.com/repository/public" }
+        maven { url 'https://maven.aliyun.com/repository/spring' }
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+rootProject.name = 'dankal-share-cache'
+

src/main/java/cn/dankal/share/cache/CacheApplication.java

+package cn.dankal.share.cache;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.context.annotation.Bean;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+@EnableCaching
+@SpringBootApplication
+public class CacheApplication {
+
+
+    /**
+     * register a  {@link Gson}  instanced
+     *
+     * @return {@link Gson}
+     * @see GsonBuilder
+     */
+    @Bean
+    public Gson gson() {
+        return new GsonBuilder().create();
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(CacheApplication.class, args);
+    }
+}

src/main/java/cn/dankal/share/cache/common/Const.java

+package cn.dankal.share.cache.common;
+
+import cn.hutool.core.util.StrUtil;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+public interface Const {
+
+    /**
+     * redis  key   /redis  pattern
+     */
+    interface RedisKey {
+        /**
+         * redis key  pattern
+         *
+         * @see {@link StrUtil#format(CharSequence, Object...)}
+         */
+        String KEY_PATTERN_PROVINCES_DETAIL = "java_cache_provinces_detail_{}";
+    }
+
+    /**
+     * Cache timeout
+     */
+    interface CacheTimeout {
+        /**
+         * timeout: provinces detail
+         */
+        long TIMEOUT_PROVINCES_DETAIL_MINUTES = 5;
+        /**
+         * timeout: null data (缓存穿透)
+         */
+        long TIMEOUT_NULL_DATA_MINUTES = 1;
+    }
+}

src/main/java/cn/dankal/share/cache/config/MybatisPlusConfig.java

+package cn.dankal.share.cache.config;
+
+import com.baomidou.mybatisplus.annotation.DbType;
+import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+@Configuration
+@MapperScan("cn.dankal.share.cache.mapper")
+public class MybatisPlusConfig {
+
+    /**
+     * MybatisPlusInterceptor: 分页
+     *
+     * @return {@link MybatisPlusInterceptor}
+     */
+    @Bean
+    public MybatisPlusInterceptor mybatisPlusInterceptor() {
+        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
+        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
+        return interceptor;
+    }
+}

src/main/java/cn/dankal/share/cache/config/SpringCacheConfig.java

+package cn.dankal.share.cache.config;
+
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.cache.interceptor.KeyGenerator;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.cache.RedisCacheConfiguration;
+import org.springframework.data.redis.cache.RedisCacheManager;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+
+import java.lang.reflect.Method;
+import java.time.Duration;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+@Configuration
+public class SpringCacheConfig {
+
+    /**
+     * {@link Cacheable} 默认 {@link KeyGenerator}
+     *
+     * @return {@link KeyGenerator}
+     */
+    @Bean("customerKeyGenerator")
+    public KeyGenerator keyGenerator() {
+        return (Object target, Method method, Object... params) -> {
+            StringBuilder stringBuilder = new StringBuilder();
+            for (int i = 0; i < params.length; i++) {
+                stringBuilder.append(params[i]);
+            }
+            return stringBuilder.toString();
+        };
+    }
+
+    /**
+     * 注册一个 {@link CacheManager}
+     *
+     * @param connectionFactory {@link RedisConnectionFactory}
+     * @return  {@link CacheManager}
+     */
+    @Bean
+    public CacheManager cacheManager(RedisConnectionFactory connectionFactory) {
+        return RedisCacheManager
+                .builder(connectionFactory)
+                .cacheDefaults(
+                        RedisCacheConfiguration.defaultCacheConfig()
+                                //缓存时间绝对过期时间20s
+                                .entryTtl(Duration.ofSeconds(120)))
+                .transactionAware()
+                .build();
+    }
+}

src/main/java/cn/dankal/share/cache/controller/TestController.java

+package cn.dankal.share.cache.controller;
+
+import cn.dankal.share.cache.entity.Provinces;
+import cn.dankal.share.cache.service.IProvincesService;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+@RestController
+@RequestMapping("/test")
+public class TestController {
+
+    /**
+     * provincesService
+     */
+    private final IProvincesService provincesService;
+
+    public TestController(IProvincesService provincesService) {
+        this.provincesService = provincesService;
+    }
+
+
+    @GetMapping("/{provinceId}")
+    public Provinces getProvincesWithSpringCache(@PathVariable("provinceId") String provinceId) {
+        return provincesService.detailWithSpringCache(provinceId).orElse(null);
+    }
+
+    @PostMapping
+    public Integer updateProvinceWithSpringCache(@RequestBody @Validated Provinces provinces) {
+        return provincesService.updateProvinces(provinces).orElse(0);
+    }
+}

src/main/java/cn/dankal/share/cache/entity/Provinces.java

+package cn.dankal.share.cache.entity;
+
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.experimental.Accessors;
+
+import javax.validation.constraints.NotBlank;
+import java.io.Serializable;
+
+/**
+ * 省份信息表
+ *
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+@Data
+@Accessors(chain = true)
+@EqualsAndHashCode(callSuper = false)
+@TableName("tb_provinces")
+public class Provinces implements Serializable {
+
+    private static final long serialVersionUID = -8658488154638835028L;
+
+    /**
+     * 主键 id
+     */
+    private Integer id;
+
+    /**
+     * 省份 id
+     */
+    @NotBlank(message = "provinceId 不能为空")
+    private String provinceId;
+
+    /**
+     * 省份 名称
+     */
+    private String provinceName;
+}
\ No newline at end of file

src/main/java/cn/dankal/share/cache/factory/ThreadExecutorFactory.java

+package cn.dankal.share.cache.factory;
+
+import cn.hutool.core.util.StrUtil;
+
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * ThreadExecutorFactory
+ *
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2020-12-23
+ */
+public class ThreadExecutorFactory {
+
+
+    /**
+     * 获取  ThreadPoolExecutor
+     *
+     * @param corePoolSize       核心线程数
+     * @param maximumPoolSize    最大线程数
+     * @param keepAliveTime      超过核心线程数的线程存活时间
+     * @param timeUnit           超过核心线程数的线程存活时间单位
+     * @param threadNamePrefix   创建线程的名称前缀
+     * @param blockQueueCapacity 线程池阻塞队列的容量
+     * @return ThreadPoolExecutor
+     * @see ThreadPoolExecutor
+     */
+    public static ThreadPoolExecutor getThreadPoolExecutor(int corePoolSize,
+                                                           int maximumPoolSize,
+                                                           long keepAliveTime,
+                                                           TimeUnit timeUnit,
+                                                           String threadNamePrefix,
+                                                           int blockQueueCapacity) {
+        // 参数校验
+        if (corePoolSize <= 0) {
+            throw new IllegalArgumentException("corePoolSize 必须大于0");
+        }
+        if (maximumPoolSize <= 0) {
+            throw new IllegalArgumentException("maximumPoolSize 必须大于0");
+        }
+        if (keepAliveTime < 0) {
+            throw new IllegalArgumentException("keepAliveTime 必须大于0");
+        }
+        if (null == timeUnit) {
+            throw new IllegalArgumentException("timeUnit 不能为空");
+        }
+        if (corePoolSize > maximumPoolSize) {
+            throw new IllegalArgumentException("corePoolSize 必须小于等于 maximumPoolSize");
+        }
+        if (StrUtil.isBlank(threadNamePrefix)) {
+            throw new IllegalArgumentException("threadNamePrefix 不能为空");
+        }
+        if (blockQueueCapacity <= 0) {
+            throw new IllegalArgumentException("blockQueueCapacity 必须大于0");
+        }
+
+        return new ThreadPoolExecutor(
+                corePoolSize,
+                maximumPoolSize,
+                keepAliveTime,
+                timeUnit,
+                new ArrayBlockingQueue<>(blockQueueCapacity),
+                threadFactory(threadNamePrefix)
+        );
+    }
+
+
+    /**
+     * 初始化 ThreadFactory 并为 创建的 线程 命名
+     *
+     * @param namePrefix 线程名称前缀
+     * @return ThreadFactory
+     */
+    private static ThreadFactory threadFactory(String namePrefix) {
+        return (runnable -> {
+            Thread thread = new Thread(runnable);
+            long id = thread.getId();
+            thread.setName(namePrefix + "-" + id);
+            return thread;
+        });
+    }
+
+    /**
+     * 获取 一个  指定 {@code maximumPoolSize} 的  {@link ThreadPoolExecutor}
+     * <pre>
+     *    corePoolSize: 1
+     *    keepAliveTime: 300 ms
+     *    blockQueueCapacity: 100
+     *  </pre>
+     *
+     * @param namePrefix      namePrefix
+     * @param maximumPoolSize maximumPoolSize
+     * @return {@link ThreadPoolExecutor}
+     */
+    public static ThreadPoolExecutor getThreadPoolExecutor(String namePrefix, Integer maximumPoolSize) {
+        return getThreadPoolExecutor(
+                1,
+                maximumPoolSize,
+                300,
+                TimeUnit.MILLISECONDS,
+                namePrefix,
+                100
+        );
+    }
+}

src/main/java/cn/dankal/share/cache/mapper/provinces/ProvincesMapper.java

+package cn.dankal.share.cache.mapper.provinces;
+
+import cn.dankal.share.cache.entity.Provinces;
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+public interface ProvincesMapper extends BaseMapper<Provinces> {
+}
\ No newline at end of file

src/main/java/cn/dankal/share/cache/mapper/provinces/ProvincesMapper.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="cn.dankal.share.cache.mapper.provinces.ProvincesMapper">
+
+</mapper>
\ No newline at end of file

src/main/java/cn/dankal/share/cache/service/IProvincesService.java

+package cn.dankal.share.cache.service;
+
+import cn.dankal.share.cache.config.SpringCacheConfig;
+import cn.dankal.share.cache.entity.Provinces;
+import cn.hutool.bloomfilter.BitMapBloomFilter;
+import com.baomidou.mybatisplus.extension.service.IService;
+import org.springframework.cache.annotation.CacheEvict;
+
+import java.util.Optional;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+public interface IProvincesService extends IService<Provinces> {
+
+    /**
+     * 获取身份详情(无缓存方案)
+     *
+     * @param provincesId 身份 id
+     * @return {@link Optional}  contains {@link Provinces}
+     */
+    Optional<Provinces> detailNoCache(String provincesId);
+
+    /**
+     * 获取身份详情(redis 缓存方案)
+     *
+     * @param provincesId 身份 id
+     * @return {@link Optional}  contains {@link Provinces}
+     */
+    Optional<Provinces> detailWithRedisCache(String provincesId);
+
+    /**
+     * 更新 {@link Provinces}
+     * {@link CacheEvict} 删除缓存
+     *
+     * @param provinces provinces
+     * @return {@link Optional}  contains {@link Integer}
+     */
+    Optional<Integer> updateProvinces(Provinces provinces);
+
+    /**
+     * 获取身份详情(spring cache 缓存方案)
+     * 使用 {@link SpringCacheConfig#keyGenerator()} 作为 缓存 key 缓存 方法执行结果
+     *
+     * @param provincesId 身份 id
+     * @return {@link Optional}  contains {@link Provinces}
+     */
+    Optional<Provinces> detailWithSpringCache(String provincesId);
+
+
+    /**
+     * 测试: 使用 {@link BitMapBloomFilter} 防止缓存击穿 (伪代码实现)
+     *
+     * @param provinceId provincesId 身份 id
+     * @return {@link Optional}  contains {@link Provinces}
+     */
+    Optional<Provinces> detailsWithBoolmFilter(String provinceId);
+}

src/main/java/cn/dankal/share/cache/service/impl/IProvincesServiceImpl.java

+package cn.dankal.share.cache.service.impl;
+
+import cn.dankal.share.cache.common.Const;
+import cn.dankal.share.cache.entity.Provinces;
+import cn.dankal.share.cache.mapper.provinces.ProvincesMapper;
+import cn.dankal.share.cache.service.IProvincesService;
+import cn.hutool.bloomfilter.BitMapBloomFilter;
+import cn.hutool.core.bean.BeanUtil;
+import cn.hutool.core.util.RandomUtil;
+import cn.hutool.core.util.StrUtil;
+import com.baomidou.mybatisplus.core.conditions.Wrapper;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.cache.annotation.CacheEvict;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.stereotype.Service;
+
+import javax.annotation.PostConstruct;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+@Slf4j
+@Service
+public class IProvincesServiceImpl extends ServiceImpl<ProvincesMapper, Provinces> implements IProvincesService {
+
+
+    /**
+     * gson
+     */
+    private final Gson gson;
+
+    /**
+     * stringRedisTemplate
+     */
+    private final StringRedisTemplate stringRedisTemplate;
+
+    private BitMapBloomFilter bitMapBloomFilter;
+
+    public IProvincesServiceImpl(Gson gson, StringRedisTemplate stringRedisTemplate) {
+        this.gson = gson;
+        this.stringRedisTemplate = stringRedisTemplate;
+    }
+
+    @PostConstruct
+    public void postConstruct() {
+        bitMapBloomFilter = new BitMapBloomFilter(10);
+        LambdaQueryWrapper<Provinces> provincesLambdaQueryWrapper = new LambdaQueryWrapper<Provinces>()
+                .select(Provinces::getProvinceId);
+        baseMapper.selectList(provincesLambdaQueryWrapper)
+                .stream()
+                .filter(Objects::nonNull)
+                .map(Provinces::getProvinceId)
+                .forEach(bitMapBloomFilter::add);
+    }
+
+    @Override
+    public Optional<Provinces> detailNoCache(String provincesId) {
+        if (StrUtil.isBlank(provincesId)) {
+            return Optional.empty();
+        }
+        Provinces provinces = getProvincesByProvinces(provincesId);
+        if (log.isDebugEnabled()) {
+            log.debug("detailNoCache ==> {} get Provinces by {} from database.", Thread.currentThread().getName(), provincesId);
+        }
+        return Optional.ofNullable(provinces);
+    }
+
+    /**
+     * 通过 provincesId 从数据库中查询 {@link Provinces}
+     *
+     * @param provincesId provincesId
+     * @return Provinces
+     * @see {@link BaseMapper#selectOne(Wrapper)}
+     */
+    private Provinces getProvincesByProvinces(String provincesId) {
+        if (log.isDebugEnabled()) {
+            log.debug("getProvincesByProvinces ==> get {} from database.", provincesId);
+        }
+        LambdaQueryWrapper<Provinces> provincesLambdaQueryWrapper = new LambdaQueryWrapper<Provinces>()
+                .eq(Provinces::getProvinceId, provincesId);
+        return baseMapper.selectOne(provincesLambdaQueryWrapper);
+    }
+
+    @Override
+    public Optional<Provinces> detailWithRedisCache(String provincesId) {
+        if (StrUtil.isBlank(provincesId)) {
+            return Optional.empty();
+        }
+        String key = StrUtil.format(Const.RedisKey.KEY_PATTERN_PROVINCES_DETAIL, provincesId);
+        String cache = stringRedisTemplate.opsForValue().get(key);
+        if (StrUtil.isNotBlank(cache)) {
+            if (log.isDebugEnabled()) {
+                log.debug("detailWithRedisCache  ==> {} success hit cache {}", Thread.currentThread().getName(), cache);
+            }
+            // 缓存命中
+            return gson.fromJson(cache, new TypeToken<Optional<Provinces>>() {
+            }.getType());
+        } else {
+            // 数据没有缓存
+            // TODO 缓存击穿 分布式锁  etc. Redisson
+            Provinces provinces = this.getProvincesByProvinces(provincesId);
+            Optional<Provinces> provincesOptional;
+            if (BeanUtil.isNotEmpty(provinces)) {
+                if (log.isDebugEnabled()) {
+                    log.debug("detailWithRedisCache  ==> {} success get provinces by {} from  database.", Thread.currentThread().getName(), provincesId);
+                }
+                provincesOptional = Optional.of(provinces);
+                final long timeoutInMinutes = Const.CacheTimeout.TIMEOUT_PROVINCES_DETAIL_MINUTES;
+                stringRedisTemplate.opsForValue().set(key, gson.toJson(provincesOptional), timeoutInMinutes, TimeUnit.MINUTES);
+            } else {
+                // 防止缓存穿透
+                if (log.isDebugEnabled()) {
+                    log.debug("detailWithRedisCache  ==> {} preven cache break down .", Thread.currentThread().getName());
+                }
+                final long timeoutInMinutes = Const.CacheTimeout.TIMEOUT_PROVINCES_DETAIL_MINUTES;
+                provincesOptional = Optional.empty();
+                stringRedisTemplate.opsForValue()
+                        .set(key, gson.toJson(provincesOptional), timeoutInMinutes, TimeUnit.MINUTES);
+            }
+            // 防止缓存雪崩
+            // 每一个缓存 30秒 以内的随机差距
+            Long expire = stringRedisTemplate.getExpire(key, TimeUnit.SECONDS);
+            expire += RandomUtil.randomLong(30);
+            stringRedisTemplate.expire(key, expire, TimeUnit.SECONDS);
+            return provincesOptional;
+        }
+    }
+
+
+    @CacheEvict(cacheNames = "provinces_detail_cache", key = "#provinces.provinceId")
+    @Override
+    public Optional<Integer> updateProvinces(Provinces provinces) {
+        LambdaQueryWrapper<Provinces> provincesLambdaQueryWrapper = new LambdaQueryWrapper<Provinces>()
+                .eq(Provinces::getProvinceId, provinces.getProvinceId());
+        int update = baseMapper.update(provinces, provincesLambdaQueryWrapper);
+        return Optional.of(update);
+    }
+
+    @Cacheable(cacheNames = "provinces_detail_cache", keyGenerator = "customerKeyGenerator")
+    @Override
+    public Optional<Provinces> detailWithSpringCache(String provincesId) {
+        Provinces provinces = this.getProvincesByProvinces(provincesId);
+        return Optional.ofNullable(provinces);
+    }
+
+    @Override
+    public Optional<Provinces> detailsWithBoolmFilter(String provinceId) {
+        if (StrUtil.isBlank(provinceId)) {
+            return Optional.empty();
+        }
+        if (!bitMapBloomFilter.contains(provinceId)) {
+            // provinceId 不存在
+            return Optional.empty();
+        }
+        return Optional.ofNullable(this.getProvincesByProvinces(provinceId));
+    }
+}

src/main/resources/application.yml

+server:
+  port: 9102
+spring:
+  application:
+    name: dankal-share-cache
+  redis:
+    host: 127.0.0.1
+    port: 6379
+  datasource:
+     druid:
+       url: jdbc:mysql://127.0.0.1:3306/test?serverTimezone=Asia/Shanghai&useSSL=false&useUnicode=true&characterEncoding=UTF-8
+       username: root
+       password: 123456
+
+# Mybatis Plus Common Config
+mybatis-plus:
+  mapper-locations: classpath*:/cn/dankal/share/cache/mapper/**/*.xml
+  configuration:
+    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
+
+
+logging:
+  level:
+    cn.dankal.share: debug
+    org.springframework.boot.autoconfigure: error
+debug: true
\ No newline at end of file

src/test/java/cn/dankal/share/ApplicationContextProvider.java

+package cn.dankal.share;
+
+import cn.dankal.share.cache.CacheApplication;
+import org.springframework.boot.test.context.SpringBootTest;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+@SpringBootTest(classes = {CacheApplication.class})
+public class ApplicationContextProvider {
+
+}

src/test/java/cn/dankal/share/provicens/ProvincesServiceTest.java

+package cn.dankal.share.provicens;
+
+import cn.dankal.share.ApplicationContextProvider;
+import cn.dankal.share.cache.entity.Provinces;
+import cn.dankal.share.cache.factory.ThreadExecutorFactory;
+import cn.dankal.share.cache.service.IProvincesService;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ThreadPoolExecutor;
+
+/**
+ * @author ZGH.MercyModest
+ * @version V1.0.0
+ * @create 2021-03-26
+ */
+public class ProvincesServiceTest extends ApplicationContextProvider {
+
+    /**
+     * provincesService
+     */
+    @Autowired
+    private IProvincesService provincesService;
+
+    /**
+     * 测试 {@link IProvincesService#page(IPage)}
+     * <br/>
+     * 分页插件有效性校验
+     */
+    @Test
+    @Disabled
+    public void testProductServicePage() {
+        final int page = 1;
+        final int num = 10;
+        Page<Provinces> pageObj = new Page<>(page, num);
+        provincesService.page(pageObj)
+                .getRecords()
+                .forEach(System.out::println);
+    }
+
+    /**
+     * 测试: 高并发对于程序的影响  无缓存
+     */
+    @Test
+    @Disabled
+    public void testConcurrentEffectiveWithNoCache() throws InterruptedException {
+        final int maximumPoolSize = 5000;
+        ThreadPoolExecutor threadPoolExecutor = ThreadExecutorFactory.getThreadPoolExecutor("test-no-cache", maximumPoolSize);
+        final String provincesId = "440000";
+        for (int i = 0; i < maximumPoolSize; i++) {
+            threadPoolExecutor.execute(() -> this.provincesService.detailNoCache(provincesId));
+        }
+        // 让程序保持运行
+        new CountDownLatch(1).await();
+    }
+    /**
+     * 测试: 高并发对于程序的影响  无缓存
+     */
+    @Test
+    @Disabled
+    public void testConcurrentEffectiveWithCache() throws InterruptedException {
+        final int maximumPoolSize = 10000;
+        ThreadPoolExecutor threadPoolExecutor = ThreadExecutorFactory.getThreadPoolExecutor("test-cache", maximumPoolSize);
+        final String provincesId = "440000";
+        for (int i = 0; i < maximumPoolSize; i++) {
+            threadPoolExecutor.execute(() -> this.provincesService.detailWithRedisCache(provincesId));
+        }
+        // 让程序保持运行
+        new CountDownLatch(1).await();
+    }
+}

test-http/http-client.env.json

+{
+  "dev": {
+    "host-test": "http://localhost:9102/test"
+  }
+}
\ No newline at end of file

test-http/test.http

+GET {{host-test}}/440000
+
+###
+POST {{host-test}}
+Content-Type: application/json
+
+{
+  "id": 19,
+  "provinceId": "440000",
+  "provinceName": "广东省2"
+}
+