psalm/tests/Provider/FileStorageInstanceCacheProvider.php

<?php
namespace Psalm\Tests\Provider;

use Psalm\Storage\FileStorage;

class FileStorageInstanceCacheProvider extends \Psalm\Internal\Provider\FileStorageCacheProvider
{
    /** @var array<string, FileStorage> */
    private $cache = [];

    public function __construct()
    {
    }

    /**
     * @param  string $file_path
     * @param  string $file_contents
     *
     * @return void
     */
    public function writeToCache(FileStorage $storage, $file_contents)
    {
        $file_path = strtolower($storage->file_path);
        $this->cache[$file_path] = $storage;
    }

    /**
     * @param  string $file_path
     * @param  string $file_contents
     *
     * @return FileStorage|null
     */
    public function getLatestFromCache($file_path, $file_contents)
    {
        $cached_value = $this->loadFromCache(strtolower($file_path));

        if (!$cached_value) {
            return null;
        }

        return $cached_value;
    }

    /**
     * @param  string $file_path
     *
     * @return void
     */
    public function removeCacheForFile($file_path)
    {
        unset($this->cache[strtolower($file_path)]);
    }

    /**
     * @param  string  $file_path
     *
     * @return FileStorage|null
     */
    private function loadFromCache($file_path)
    {
        return $this->cache[strtolower($file_path)] ?? null;
    }
}