@thermopylae/lib.cache/dist/policies/eviction/lru.js

Modular cache.

import { DoublyLinkedList } from "../../data-structures/list/doubly-linked.js";
import { createException } from "../../error.js";
class LRUEvictionPolicy {
    cacheMaxCapacity;
    cacheBackendElementsCount;
    deleteFromCache;
    usageRecency;
    constructor(cacheMaxCapacity, cacheBackendElementsCount) {
        if (cacheMaxCapacity <= 0) {
            throw createException("INVALID_CACHE_MAX_CAPACITY" , `Capacity needs to be greater than 0. Given: ${cacheMaxCapacity}.`);
        }
        this.cacheMaxCapacity = cacheMaxCapacity;
        this.cacheBackendElementsCount = cacheBackendElementsCount;
        this.usageRecency = new DoublyLinkedList();
    }
    onHit(entry) {
        this.usageRecency.toFront(entry);
        return 1 ;
    }
    onMiss() {
        return undefined;
    }
    onSet(entry) {
        if (this.cacheBackendElementsCount.size > this.cacheMaxCapacity) {
            this.deleteFromCache(this.usageRecency.tail); 
        }
        this.usageRecency.unshift(entry);
    }
    onUpdate() {
        return undefined;
    }
    onDelete(entry) {
        this.usageRecency.remove(entry);
    }
    onClear() {
        this.usageRecency.clear();
    }
    setDeleter(deleter) {
        this.deleteFromCache = deleter;
    }
}
export { LRUEvictionPolicy };