Golang中实现高效人工智能算法的缓存机制。

package main

import (
    "fmt"
    "time"
)

func main() {
    cache := make(map[string]string)
    cache["key1"] = "value1"
    cache["key2"] = "value2"

    //获取缓存数据
    value, ok := cache["key1"]
    if ok {
        fmt.Println("缓存命中:", value)
    } else {
        fmt.Println("缓存未命中")
    }

    //插入新的缓存数据
    cache["key3"] = "value3"

    //使用time包来控制缓存的失效时间
    time.Sleep(time.Second * 5)
    _, ok = cache["key3"]
    if ok {
        fmt.Println("缓存未过期")
    } else {
        fmt.Println("缓存已过期")
    }
}

type DoubleListNode struct {
    key  string
    val  string
    prev *DoubleListNode
    next *DoubleListNode
}

type LRUCache struct {
    cap      int
    cacheMap map[string]*DoubleListNode
    head     *DoubleListNode
    tail     *DoubleListNode
}

func Constructor(capacity int) LRUCache {
    head := &DoubleListNode{}
    tail := &DoubleListNode{}
    head.next = tail
    tail.prev = head
    return LRUCache{
        cap:      capacity,
        cacheMap: make(map[string]*DoubleListNode),
        head:     head,
        tail:     tail,
    }
}

func (this *LRUCache) moveNodeToHead(node *DoubleListNode) {
    node.prev.next = node.next
    node.next.prev = node.prev
    node.next = this.head.next
    node.prev = this.head
    this.head.next.prev = node
    this.head.next = node
}

func (this *LRUCache) removeTailNode() {
    delete(this.cacheMap, this.tail.prev.key)
    this.tail.prev.prev.next = this.tail
    this.tail.prev = this.tail.prev.prev
}

func (this *LRUCache) Get(key string) string {
    val, ok := this.cacheMap[key]
    if !ok {
        return ""
    }
    this.moveNodeToHead(val)
    return val.val
}

func (this *LRUCache) Put(key string, value string) {
    //缓存中已存在key
    if node, ok := this.cacheMap[key]; ok {
        node.val = value
        this.moveNodeToHead(node)
        return
    }

    //缓存已满，需要淘汰末尾节点
    if len(this.cacheMap) == this.cap {
        this.removeTailNode()
    }

    //插入新节点
    newNode := &DoubleListNode{
        key:  key,
        val:  value,
        prev: this.head,
        next: this.head.next,
    }
    this.head.next.prev = newNode
    this.head.next = newNode
    this.cacheMap[key] = newNode
}