??:

????? ??? ???? ??? ???? ???? ?????. ??? ??, ?? ????, ?? ??? ? ???? ???? ?? ???? ??? ?? ???? ??? ??? ?????. ??? ?? ??? ??? ??????? ? ??? ? ?? ??? ??? ???? ? ??? ?? ? ????. ??? ?? ?? ???? ???? ?? ??? ???? ??? ??? ??? ???? ???? ? ? ????.

? ????? ? ?? ??? ???? ?? ?? ?? AVL ??? ??? ???? ?? ?? ??? ??? ?? ?????. ?? ??? ?? ??, ???? ??? ??, ??? ??? ?? ?? ??? ?? TTL(Time to Live) ????? ?????. ? ????? ??? ?? ???? ??? ????? ?? ?? ??? ???? ???? ??? ??? ???? ????? ??? ???? ?????.

1. TTL? ???? AVL ?? ??

??? ??? ???? ?? TTL ??? ???? AVL ???? ?????. ? ??? ? ??? ??? ?? ??? ???? ??? ???? ???? ?????.

// src/utils/avltree.ts

class AVLNode {
  key: string;
  value: any;
  ttl: number; // Time to live
  height: number;
  left: AVLNode | null;
  right: AVLNode | null;

  constructor(key: string, value: any, ttl: number) {
    this.key = key;
    this.value = value;
    this.ttl = Date.now() + ttl; // Expiry time
    this.height = 1;
    this.left = null;
    this.right = null;
  }

  isExpired(): boolean {
    return Date.now() > this.ttl;
  }
}

export class AVLTree {
  private root: AVLNode | null;

  constructor() {
    this.root = null;
  }

  private getHeight(node: AVLNode | null): number {
    return node ? node.height : 0;
  }

  private updateHeight(node: AVLNode): void {
    node.height = 1 + Math.max(this.getHeight(node.left), this.getHeight(node.right));
  }

  private rotateRight(y: AVLNode): AVLNode {
    const x = y.left!;
    y.left = x.right;
    x.right = y;
    this.updateHeight(y);
    this.updateHeight(x);
    return x;
  }

  private rotateLeft(x: AVLNode): AVLNode {
    const y = x.right!;
    x.right = y.left;
    y.left = x;
    this.updateHeight(x);
    this.updateHeight(y);
    return y;
  }

  private getBalance(node: AVLNode): number {
    return node ? this.getHeight(node.left) - this.getHeight(node.right) : 0;
  }

  insert(key: string, value: any, ttl: number): void {
    this.root = this.insertNode(this.root, key, value, ttl);
  }

  private insertNode(node: AVLNode | null, key: string, value: any, ttl: number): AVLNode {
    if (!node) return new AVLNode(key, value, ttl);

    if (key < node.key) {
      node.left = this.insertNode(node.left, key, value, ttl);
    } else if (key > node.key) {
      node.right = this.insertNode(node.right, key, value, ttl);
    } else {
      node.value = value;
      node.ttl = Date.now() + ttl;
      return node;
    }

    this.updateHeight(node);
    const balance = this.getBalance(node);

    if (balance > 1 && key < node.left!.key) return this.rotateRight(node);
    if (balance < -1 && key > node.right!.key) return this.rotateLeft(node);
    if (balance > 1 && key > node.left!.key) {
      node.left = this.rotateLeft(node.left!);
      return this.rotateRight(node);
    }
    if (balance < -1 && key < node.right!.key) {
      node.right = this.rotateRight(node.right!);
      return this.rotateLeft(node);
    }
    return node;
  }

  search(key: string): any {
    let node = this.root;
    while (node) {
      if (node.isExpired()) {
        this.delete(node.key);
        return null;
      }
      if (key === node.key) return node.value;
      node = key < node.key ? node.left : node.right;
    }
    return null;
  }

  delete(key: string): void {
    this.root = this.deleteNode(this.root, key);
  }

  private deleteNode(node: AVLNode | null, key: string): AVLNode | null {
    if (!node) return null;

    if (key < node.key) {
      node.left = this.deleteNode(node.left, key);
    } else if (key > node.key) {
      node.right = this.deleteNode(node.right, key);
    } else {
      if (!node.left || !node.right) return node.left || node.right;
      let minLargerNode = node.right;
      while (minLargerNode.left) minLargerNode = minLargerNode.left;
      node.key = minLargerNode.key;
      node.value = minLargerNode.value;
      node.ttl = minLargerNode.ttl;
      node.right = this.deleteNode(node.right, minLargerNode.key);
    }
    this.updateHeight(node);
    const balance = this.getBalance(node);

    if (balance > 1 && this.getBalance(node.left!) >= 0) return this.rotateRight(node);
    if (balance < -1 && this.getBalance(node.right!) <= 0) return this.rotateLeft(node);
    if (balance > 1 && this.getBalance(node.left!) < 0) {
      node.left = this.rotateLeft(node.left!);
      return this.rotateRight(node);
    }
    if (balance < -1 && this.getBalance(node.right!) > 0) {
      node.right = this.rotateRight(node.right!);
      return this.rotateLeft(node);
    }
    return node;
  }
}

2. TTL ? ?? ????? ?? ??? ?? ???

? ???? AVLTree ???? ???? ???? ????? ???? ?????. ???? ??? ??? ?? ?? ?? ????? ???? ????.

// src/cache/cache.service.ts

import { Injectable, UnauthorizedException } from '@nestjs/common';
import { AVLTree } from '../utils/avltree';

@Injectable()
export class CacheService {
  private avlTree: AVLTree;
  private authorizedTokens: Set<string> = new Set(['your_authorized_token']); // Simple validation example

  constructor() {
    this.avlTree = new AVLTree();
  }

  validateToken(token: string): void {
    if (!this.authorizedTokens.has(token)) {
      throw new UnauthorizedException('Invalid access token');
    }
  }

  set(key: string, value: any, ttl: number, token: string): void {
    this.validateToken(token);
    this.avlTree.insert(key, value, ttl);
  }

  get(key: string, token: string): any {
    this.validateToken(token);
    return this.avlTree.search(key);
  }

  delete(key: string, token: string): void {
    this.validateToken(token);
    this.avlTree.delete(key);
  }
}

3. ?? ? TTL? ?? ????

API ????? ??, ????, ?? ???? ???? ???? ???? ???? ?????.

// src/cache/cache.controller.ts

import { Controller, Get, Post, Delete, Body, Param, Query } from '@nestjs/common';
import { CacheService } from './cache.service';

@Controller('cache')
export class CacheController {
  constructor(private readonly cacheService: CacheService) {}

  @Post('set')
  setCache(@Body() body: { key: string; value: any; ttl: number; token: string }) {
    this.cacheService.set(body.key, body.value, body.ttl, body.token);
    return { message: 'Data cached successfully' };
  }

  @Get('get/:key')
  getCache(@Param('key') key: string, @Query('token') token: string) {
    const value = this.cacheService.get(key, token);
    return value ? { value } : { message: 'Key not found or expired' };
  }

  @Delete('delete/:key')
  deleteCache(@Param('key') key: string, @Query('token') token: string) {
    this.cacheService.delete(key);
    return { message: 'Key deleted successfully' };
  }
}

?? ???? ?? ?? ??

1. ?? ???? ?? ?? ??:
   
   ?: ?? ? ?? ???

2. ?? ??? ??? ?? API ??:
   
   ?: ?? ? ? ?? ????.

3. ??? ???? ??? ??? ?? ??:
   
   ?: WhatsApp, Telegram? ?? ??? ?.

4. ??? ??? ?? ??? ??:
   
   ?: Amazon? ?? ???? ?? ????? ???.

??? ?? ? ?? ???? ??????? ?? ??? ?? ?? ???? ?? ??? ???? ? ??? ?????.

??

? ????? AVL ??? ?? ?? ???? ?? ??? ???? ?? ?? ???? ???? ?? ?? ???? ???? ??????. TTL ????? ?? ??? ?? ??? ???? ??? ?? ??? ??? ??? ?????.

? ??? ?? ???? ????? ???? ???? ??? ???? ?? ??? ??????? ???? ?? ????? ?? ??? ?? ??? ?????.

? ??? ??? ?????: ??? ?? ???? ?? ?? ?? ?? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!