code: public function loadClassMetadata(LoadClassMetadataEventArgs $eventArgs)
      {
          if (empty($this->replacements)) {
              return;
          }
  
          /** @var ClassMetadataInfo $metadata */
          $metadata = $eventArgs->getClassMetadata();
  
          // Handle table name.
          $tableName = $metadata->getTableName();
          if ($tableName) {
              $metadata->setPrimaryTable(
                  [
                      'name' => $this->doReplacement($tableName),
                  ]
              );
          }
  
          // Handle fields AKA columns.
          foreach ($metadata->getFieldNames() as $fieldName) {
              $mapping = $metadata->getFieldMapping($fieldName);
              foreach ($mapping as $key => $value) {
                  if (is_string($value)) {
                      $mapping[$key] = $this->doReplacement($value);
                  }
              }
              $metadata->setAttributeOverride($fieldName, $mapping);
          }
  
          // Handle associations AKA foreign keys.
          $associationMappings = $metadata->getAssociationMappings();
          foreach ($metadata->getAssociationNames() as $fieldName) {
              if (isset($associationMappings[$fieldName])) {
                  $associationMapping = $associationMappings[$fieldName];
                  if (isset($associationMapping['joinColumns'])) {
                      foreach ($associationMapping['joinColumns'] as $key => $joinColumn) {
                          $associationMapping['joinColumns'][$key]['name'] = $this->doReplacement($joinColumn['name']);
                          $associationMapping['joinColumns'][$key]['referencedColumnName'] = $this->doReplacement(
                              $joinColumn['referencedColumnName']
                          );
                      }
                      $metadata->setAssociationOverride($fieldName, $associationMapping);
                  }
              }
          }
  
          // Handle discriminator.
          if (count($metadata->discriminatorMap)) {
              $this->processDiscriminatorMap($metadata);
          }
      }
docs: Processes doctrine mapping metadata and does replacements, as provided in replacements map.
  
  @param LoadClassMetadataEventArgs $eventArgs