transitory/dist/esm/cache/CacheNode.js

In-memory cache with high hit rates via LFU eviction. Supports time-based expiration, automatic loading and metrics.

/**
 * Node in a double-linked list.
 */
export class CacheNode {
    constructor(key, value) {
        this.key = key;
        this.value = value;
        this.previous = this;
        this.next = this;
    }
    remove() {
        this.previous.next = this.next;
        this.next.previous = this.previous;
        this.next = this;
        this.previous = this;
    }
    appendToTail(head) {
        const tail = head.previous;
        head.previous = this;
        tail.next = this;
        this.next = head;
        this.previous = tail;
    }
    moveToTail(head) {
        this.remove();
        this.appendToTail(head);
    }
}
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