Cache

实现一个简单通用的缓存框架，研究内存数据存储的实现与设计

框架构造

• 泛型化设计，不同业务维度可以通用
• 标准化接口，满足多场景的使用诉求
• 多策略可选，允许选择不同实现策略甚至是缓存存储机制

特性实现

• 使用 fluent 流式配置
• 支持 cache 固定大小
• 支持自定义 map 实现策略
• 支持 expire 过期特性
• 支持 FIFO 和 LRU 驱除策略
• 支持 load 初始化和 persist 持久化
• 整合日志框架

ICache 接口

接口名称	含义说明
enableEvict	配置淘汰策略
enableExpire	配置过期策略
enablePersist	配置持久化方法
enableLoad	配置初始化方法
has	判断缓存中是否有指定的值
remove	将指定的缓存记录删除
get	根据键查询对应的值
put	将数据添加到缓存中
setExpire	设置缓存过期时间
getValues	根据多个键查询多个值
getAllKeys	获取所有键
getAllValues	获取所有值
getAll	获取所有数据

测试

Cache<Integer, Integer> cache = new Cache<Integer, Integer>()
                .enableEvict(3)
                .enableExpire(10,MINUTES)
                .enablePersist("src/main/resources/persist.json",10,SECONDS)
                .enableLoad("src/main/resources/persist.json");

        Set<Map.Entry<Integer, Integer>> set;
        for (int i = 0; i < 5; i++) {
            cache.put(i, i,i,SECONDS);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                System.out.println("中断");
            }
        }
        System.out.println(cache.get(1));

运行日志

19:06:56.818 [main] DEBUG org.cache.load.LoadJson -- Loading json
19:06:56.940 [main] DEBUG org.cache.core.Cache -- put key:3
19:06:56.941 [main] DEBUG org.cache.core.Cache -- put key:4
19:06:56.941 [main] DEBUG org.cache.load.LoadJson -- Loading completed
19:06:56.941 [main] DEBUG org.cache.core.Cache -- put key:0 and set time
19:06:57.822 [Timer-0] DEBUG org.cache.load.LoadJson -- Timely expire
19:06:57.822 [Timer-0] DEBUG org.cache.core.Cache -- remove key:0
19:06:57.822 [Timer-0] DEBUG org.cache.load.LoadJson -- Timely expire completed
19:06:57.823 [Timer-1] DEBUG org.cache.load.LoadJson -- Persisting json
19:06:57.830 [Timer-1] DEBUG org.cache.load.LoadJson -- Persisting completed
19:06:57.946 [main] DEBUG org.cache.core.Cache -- put key:1 and set time
19:06:58.947 [main] DEBUG org.cache.core.Cache -- remove key:3
19:06:58.947 [main] DEBUG org.cache.evict.EvictLRU -- evict eldest key
19:06:58.947 [main] DEBUG org.cache.core.Cache -- put key:2 and set time
19:06:59.949 [main] DEBUG org.cache.core.Cache -- remove key:4
19:06:59.949 [main] DEBUG org.cache.evict.EvictLRU -- evict eldest key
19:06:59.949 [main] DEBUG org.cache.core.Cache -- put key:3 and set time
19:07:00.950 [main] DEBUG org.cache.core.Cache -- remove key:1
19:07:00.950 [main] DEBUG org.cache.evict.EvictLRU -- evict eldest key
19:07:00.950 [main] DEBUG org.cache.core.Cache -- put key:4 and set time
19:07:01.952 [main] DEBUG org.cache.load.LoadJson -- Lazy expire
19:07:01.952 [main] DEBUG org.cache.core.Cache -- remove key:1
19:07:01.952 [main] DEBUG org.cache.core.Cache -- remove key:2
19:07:01.952 [main] DEBUG org.cache.evict.EvictLRU -- evict eldest key
19:07:01.952 [main] DEBUG org.cache.core.Cache -- get key:1
null
19:07:02.835 [Timer-0] DEBUG org.cache.load.LoadJson -- Timely expire
19:07:02.835 [Timer-0] DEBUG org.cache.core.Cache -- remove key:2
19:07:02.835 [Timer-0] DEBUG org.cache.load.LoadJson -- Timely expire completed
19:07:07.823 [Timer-1] DEBUG org.cache.load.LoadJson -- Persisting json
19:07:07.823 [Timer-1] DEBUG org.cache.load.LoadJson -- Persisting completed
19:07:07.835 [Timer-0] DEBUG org.cache.load.LoadJson -- Timely expire
19:07:07.835 [Timer-0] DEBUG org.cache.core.Cache -- remove key:3
19:07:07.835 [Timer-0] DEBUG org.cache.core.Cache -- remove key:4
19:07:07.835 [Timer-0] DEBUG org.cache.load.LoadJson -- Timely expire completed