Symfony Caching

code_symfony_caching.md

symfony4_caching_controller_eg.php

<?php
    //.... 
    /**
     * @Route("/coldefjson", name="coloumn_definition_json")
     */
    public function colDefJson()
    {

        $cache = new FilesystemAdapter();

        //delete the exisitng cached data
        //$cache->delete('col_def_list');

        $definitions = $cache
            ->getItem('col_def_cache')
            ->get('value');

        if(empty($definitions)) {
            //create new cache
            $definitions = $cache->get('col_def_cache', function (ItemInterface $item) {
                $item->expiresAfter(5000);

                //list the coloumn definitions
                return R::getAll('SELECT * FROM ' . Database::COLUMN_DEFINITION_TABLE);
            });
        }

        return $this->json([
            'colDef'=>$definitions
        ]);

    }

symfony_caching.php

<?php

use Symfony\Component\Cache\Adapter\FilesystemAdapter;
use Symfony\Contracts\Cache\ItemInterface;

/* _________________ */
/* within some controller class . . . */

$my_data = $Person->get('Mike');

//init and add to cache
$cache = new FilesystemAdapter();
$cache->get('rep_col_data_cache',function (ItemInterface $item) use ($my_data) {
   
  $item->expiresAfter(300); //seconds
  
  return $my_data;
  
});

/* _________________ */

/* within another class/function . . . */

//retrieve data from cache
$cache = new FilesystemAdapter();

$my_data = $cache
        ->getItem('rep_col_data_cache')
        ->get('value');

/* _________________ */

/* within another class/function . . . */

//delete cache with key
$cache = new FilesystemAdapter();
$cache->delete('rep_col_data_cache');

ref: https://symfony.com/doc/current/components/cache.html