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wp-content/plugins/mailpoet/lib/Doctrine/CacheOnlyMappingDriver.php

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+<?php declare(strict_types = 1);
+
+namespace MailPoet\Doctrine;
+
+if (!defined('ABSPATH')) exit;
+
+
+use MailPoet\RuntimeException;
+use MailPoetVendor\Doctrine\Persistence\Mapping\ClassMetadata;
+use MailPoetVendor\Doctrine\Persistence\Mapping\Driver\MappingDriver;
+use MailPoetVendor\Psr\Cache\CacheItemPoolInterface;
+
+/**
+ * Intended to be used in production environment where we rely on metadata cache for reading all metadata.
+ */
+class CacheOnlyMappingDriver implements MappingDriver {
+  /** @var string */
+  protected $cacheSalt = '__CLASSMETADATA__';
+
+  /** @var CacheItemPoolInterface */
+  private $metaDataCache;
+
+  public function __construct(
+    CacheItemPoolInterface $metaDataCache
+  ) {
+    $this->metaDataCache = $metaDataCache;
+  }
+
+  /**
+   * @inerhitDoc
+   */
+  public function loadMetadataForClass($className, ClassMetadata $metadata) {
+    // We don't need to load anything it is all cached.
+  }
+
+  /**
+   * @inerhitDoc
+   */
+  public function getAllClassNames() {
+    throw new RuntimeException('CacheOnlyMappingDriver::getAllClassNames should not be called');
+  }
+
+  /**
+   * @inerhitDoc
+   */
+  public function isTransient($className) {
+    // Everything in cache are metadata and class with metadata is non-transient
+    // See https://github.com/doctrine/persistence/blob/b07e347a24e7a19a2b6462e00a6dff899e4c2dd2/src/Persistence/Mapping/Driver/MappingDriver.php#L34
+    return !$this->metaDataCache->hasItem($this->getCacheKey($className));
+  }
+
+  /**
+   * Copy pasted from MailPoetVendor\Doctrine\Persistence\Mapping\AbstractClassMetadataFactory
+   */
+  protected function getCacheKey(string $className): string {
+    return str_replace('\\', '__', $className) . $this->cacheSalt;
+  }
+}