Begin work on cached lookup

src/StorageDrivers/Database/CachedTenantResolver.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Stancl\Tenancy\StorageDrivers\Database;
+
+use Closure;
+use Illuminate\Cache\CacheManager;
+use Illuminate\Config\Repository as ConfigRepository;
+use Illuminate\Cache\Repository as CacheRepository;
+use Illuminate\Contracts\Cache\Store;
+use Stancl\Tenancy\Tenant;
+
+class CachedTenantResolver
+{
+    /** @var CacheRepository */
+    protected $cache;
+
+    /** @var ConfigRepository */
+    protected $config;
+
+    public function __construct(CacheManager $cacheManager, ConfigRepository $config)
+    {
+        $this->cache = $cacheManager->store($config->get('tenancy.storage_drivers.db.cache_store'));
+        $this->config = $config;
+    }
+
+    protected function ttl(): int
+    {
+        return $this->config->get('tenancy.storage_drivers.db.cache_ttl');
+    }
+
+    public function getTenantIdByDomain(string $domain, Closure $query): string
+    {
+        return $this->cache->remember('_tenancy_domain_to_id:' . $domain, $this->ttl(), $query);
+    }
+
+    public function findById(string $id, Closure $dataQuery, Closure $domainsQuery): Tenant
+    {
+        $data = $this->cache->remember('_tenancy_id_to_data:' . $id, $this->ttl(), $dataQuery);
+        $domains = $this->cache->remember('_tenancy_id_to_domains:' . $id, $this->ttl(), $domainsQuery);
+
+        return Tenant::fromStorage($data)->withDomains($domains);
+    }
+
+    // todo update cache on writes to data & domains
+}