Cache can be forced by static setting under kernel

Author: mmoreram

AsyncKernel.php

@@ -39,6 +39,15 @@
 abstract class AsyncKernel extends Kernel implements CompilerPassInterface
 {
     private string $uid;
+    private bool $forceCacheUsage = false;
+
+    /**
+     * @return void
+     */
+    public function forceCacheUsage()
+    {
+        $this->forceCacheUsage = true;
+    }
 
     /**
      * {@inheritdoc}
@@ -48,7 +57,7 @@ public function boot()
         if (!$this->booted) {
             $this->uid = $this->generateUID();
 
-            if (($_ENV['DRIFT_CACHE_ENABLED'] ?? '0') !== '1') {
+            if (!$this->forceCacheUsage && ($_ENV['DRIFT_CACHE_ENABLED'] ?? '0') !== '1') {
                 $fs = new Filesystem();
                 // AsyncKernel loads the container only once when it loads. Storing it in the filesystem is not for cache purposes
                 // but more for using the same loading process as Kernel class use.

Tests/Base/KernelCacheTest.php

@@ -38,7 +38,25 @@ public function testWithoutCache()
         unset($_ENV['DRIFT_CACHE_ENABLED']);
     }
 
-    public function testWithCache()
+    public function testWithCacheFromStaticSetting()
+    {
+        static::$kernel = static::getKernel();
+        static::$kernel->forceCacheUsage();
+        static::$kernel->boot();
+
+        $cacheDir = self::$kernel->getCacheDir();
+        $firstKernelCacheCreationTime = lstat($cacheDir)['ctime'];
+        sleep(1);
+
+        static::$kernel = static::getKernel();
+        static::$kernel->forceCacheUsage();
+        $cacheDir = self::$kernel->getCacheDir();
+        $secondKernelCacheCreationTime = lstat($cacheDir)['ctime'];
+
+        $this->assertEquals($firstKernelCacheCreationTime, $secondKernelCacheCreationTime);
+    }
+
+    public function testWithCacheWithEnv()
     {
         $_ENV['DRIFT_CACHE_ENABLED'] = '1';
         static::setUpBeforeClass();