move the storage preparation responsibility

README.md

@@ -88,6 +88,9 @@ $body = \Drupal::service('entity_to_text_tika.extractor.file_to_text')->fromFile
 or for an advanced usage avoiding multiple calls to Tika:
 
 ```php
+// Anywhere at least once in the code (Eg. module.install) in order to prepare the storage.
+\Drupal::service('entity_to_text_tika.storage.local_file')->prepareStorage();
+
 // Load the already OCR'ed file if possible to avoid unecessary calls to Tika.
 $body = \Drupal::service('entity_to_text_tika.storage.local_file')->load($file, 'eng+fra');
 

modules/entity_to_text_tika/src/Storage/LocalFileStorage.php

@@ -98,9 +98,9 @@ private function getFullPath(File $file, string $langcode = 'eng'): string {
   }
 
   /**
-   * Ensure the destination directory is ready to use.
+   * {@inheritdoc}
    */
-  private function prepareDestination(): void {
+  public function prepareStorage(): void {
     $dest = self::DESTINATION;
     $this->fileSystem->prepareDirectory($dest, FileSystemInterface::CREATE_DIRECTORY);
   }

modules/entity_to_text_tika/src/Storage/StorageInterface.php

@@ -40,4 +40,10 @@ public function load(File $file, string $langcode = 'eng'): ?string;
    */
   public function save(File $file, string $content, string $langcode = 'eng'): string;
 
+  /**
+   * Ensure the storage is ready to store OCR text values.
+   *
+   * @return void
+   */
+  public function prepareStorage(): void;
 }