class OptimizedPhpArrayDumper in Drupal 8

OptimizedPhpArrayDumper dumps a service container as a serialized PHP array.

The format of this dumper is very similar to the internal structure of the ContainerBuilder, but based on PHP arrays and \stdClass objects instead of rich value objects for performance reasons.

By removing the abstraction and optimizing some cases like deep collections, fewer classes need to be loaded, fewer function calls need to be executed and fewer run time checks need to be made.

In addition to that, this container dumper treats private services as strictly private with their own private services storage, whereas in the Symfony service container builder and PHP dumper, shared private services can still be retrieved via get() from the container.

It is machine-optimized, for a human-readable version based on this one see \Drupal\Component\DependencyInjection\Dumper\PhpArrayDumper.

Hierarchy

• class \Drupal\Component\DependencyInjection\Dumper\OptimizedPhpArrayDumper extends \Symfony\Component\DependencyInjection\Dumper\Dumper

See also

\Drupal\Component\DependencyInjection\Container

File

core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php, line 36

Namespace

Drupal\Component\DependencyInjection\Dumper

class OptimizedPhpArrayDumper extends Dumper {

  /**
   * Whether to serialize service definitions or not.
   *
   * Service definitions are serialized by default to avoid having to
   * unserialize the whole container on loading time, which improves early
   * bootstrap performance for e.g. the page cache.
   *
   * @var bool
   */
  protected $serialize = TRUE;

  /**
   * A list of container aliases.
   *
   * @var array
   */
  protected $aliases;

  /**
   * {@inheritdoc}
   */
  public function dump(array $options = []) {
    return serialize($this
      ->getArray());
  }

  /**
   * Gets the service container definition as a PHP array.
   *
   * @return array
   *   A PHP array representation of the service container.
   */
  public function getArray() {
    $definition = [];

    // Warm aliases first.
    $this->aliases = $this
      ->getAliases();
    $definition['aliases'] = $this->aliases;
    $definition['parameters'] = $this
      ->getParameters();
    $definition['services'] = $this
      ->getServiceDefinitions();
    $definition['frozen'] = $this->container
      ->isCompiled();
    $definition['machine_format'] = $this
      ->supportsMachineFormat();
    return $definition;
  }

  /**
   * Gets the aliases as a PHP array.
   *
   * @return array
   *   The aliases.
   */
  protected function getAliases() {
    $alias_definitions = [];
    $aliases = $this->container
      ->getAliases();
    foreach ($aliases as $alias => $id) {
      $id = (string) $id;
      while (isset($aliases[$id])) {
        $id = (string) $aliases[$id];
      }
      $alias_definitions[$alias] = $id;
    }
    return $alias_definitions;
  }

  /**
   * Gets parameters of the container as a PHP array.
   *
   * @return array
   *   The escaped and prepared parameters of the container.
   */
  protected function getParameters() {
    if (!$this->container
      ->getParameterBag()
      ->all()) {
      return [];
    }
    $parameters = $this->container
      ->getParameterBag()
      ->all();
    $is_compiled = $this->container
      ->isCompiled();
    return $this
      ->prepareParameters($parameters, $is_compiled);
  }

  /**
   * Gets services of the container as a PHP array.
   *
   * @return array
   *   The service definitions.
   */
  protected function getServiceDefinitions() {
    if (!$this->container
      ->getDefinitions()) {
      return [];
    }
    $services = [];
    foreach ($this->container
      ->getDefinitions() as $id => $definition) {

      // Only store public service definitions, references to shared private
      // services are handled in ::getReferenceCall().
      if ($definition
        ->isPublic()) {
        $service_definition = $this
          ->getServiceDefinition($definition);
        $services[$id] = $this->serialize ? serialize($service_definition) : $service_definition;
      }
    }
    return $services;
  }

  /**
   * Prepares parameters for the PHP array dumping.
   *
   * @param array $parameters
   *   An array of parameters.
   * @param bool $escape
   *   Whether keys with '%' should be escaped or not.
   *
   * @return array
   *   An array of prepared parameters.
   */
  protected function prepareParameters(array $parameters, $escape = TRUE) {
    $filtered = [];
    foreach ($parameters as $key => $value) {
      if (is_array($value)) {
        $value = $this
          ->prepareParameters($value, $escape);
      }
      elseif ($value instanceof Reference) {
        $value = $this
          ->dumpValue($value);
      }
      $filtered[$key] = $value;
    }
    return $escape ? $this
      ->escape($filtered) : $filtered;
  }

  /**
   * Escapes parameters.
   *
   * @param array $parameters
   *   The parameters to escape for '%' characters.
   *
   * @return array
   *   The escaped parameters.
   */
  protected function escape(array $parameters) {
    $args = [];
    foreach ($parameters as $key => $value) {
      if (is_array($value)) {
        $args[$key] = $this
          ->escape($value);
      }
      elseif (is_string($value)) {
        $args[$key] = str_replace('%', '%%', $value);
      }
      else {
        $args[$key] = $value;
      }
    }
    return $args;
  }

  /**
   * Gets a service definition as PHP array.
   *
   * @param \Symfony\Component\DependencyInjection\Definition $definition
   *   The definition to process.
   *
   * @return array
   *   The service definition as PHP array.
   *
   * @throws \Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
   *   Thrown when the definition is marked as decorated, or with an explicit
   *   scope different from SCOPE_CONTAINER and SCOPE_PROTOTYPE.
   */
  protected function getServiceDefinition(Definition $definition) {
    $service = [];
    if ($definition
      ->getClass()) {
      $service['class'] = $definition
        ->getClass();
    }
    if (!$definition
      ->isPublic()) {
      $service['public'] = FALSE;
    }
    if ($definition
      ->getFile()) {
      $service['file'] = $definition
        ->getFile();
    }
    if ($definition
      ->isSynthetic()) {
      $service['synthetic'] = TRUE;
    }
    if ($definition
      ->isLazy()) {
      $service['lazy'] = TRUE;
    }
    if ($definition
      ->getArguments()) {
      $arguments = $definition
        ->getArguments();
      $service['arguments'] = $this
        ->dumpCollection($arguments);
      $service['arguments_count'] = count($arguments);
    }
    else {
      $service['arguments_count'] = 0;
    }
    if ($definition
      ->getProperties()) {
      $service['properties'] = $this
        ->dumpCollection($definition
        ->getProperties());
    }
    if ($definition
      ->getMethodCalls()) {
      $service['calls'] = $this
        ->dumpMethodCalls($definition
        ->getMethodCalls());
    }

    // By default services are shared, so just provide the flag, when needed.
    if ($definition
      ->isShared() === FALSE) {
      $service['shared'] = $definition
        ->isShared();
    }
    if (($decorated = $definition
      ->getDecoratedService()) !== NULL) {
      throw new InvalidArgumentException("The 'decorated' definition is not supported by the Drupal 8 run-time container. The Container Builder should have resolved that during the DecoratorServicePass compiler pass.");
    }
    if ($callable = $definition
      ->getFactory()) {
      $service['factory'] = $this
        ->dumpCallable($callable);
    }
    if ($callable = $definition
      ->getConfigurator()) {
      $service['configurator'] = $this
        ->dumpCallable($callable);
    }
    return $service;
  }

  /**
   * Dumps method calls to a PHP array.
   *
   * @param array $calls
   *   An array of method calls.
   *
   * @return array
   *   The PHP array representation of the method calls.
   */
  protected function dumpMethodCalls(array $calls) {
    $code = [];
    foreach ($calls as $key => $call) {
      $method = $call[0];
      $arguments = [];
      if (!empty($call[1])) {
        $arguments = $this
          ->dumpCollection($call[1]);
      }
      $code[$key] = [
        $method,
        $arguments,
      ];
    }
    return $code;
  }

  /**
   * Dumps a collection to a PHP array.
   *
   * @param mixed $collection
   *   A collection to process.
   * @param bool &$resolve
   *   Used for passing the information to the caller whether the given
   *   collection needed to be resolved or not. This is used for optimizing
   *   deep arrays that don't need to be traversed.
   *
   * @return object|array
   *   The collection in a suitable format.
   */
  protected function dumpCollection($collection, &$resolve = FALSE) {
    $code = [];
    foreach ($collection as $key => $value) {
      if (is_array($value)) {
        $resolve_collection = FALSE;
        $code[$key] = $this
          ->dumpCollection($value, $resolve_collection);
        if ($resolve_collection) {
          $resolve = TRUE;
        }
      }
      else {
        $code[$key] = $this
          ->dumpValue($value);
        if (is_object($code[$key])) {
          $resolve = TRUE;
        }
      }
    }
    if (!$resolve) {
      return $collection;
    }
    return (object) [
      'type' => 'collection',
      'value' => $code,
      'resolve' => $resolve,
    ];
  }

  /**
   * Dumps callable to a PHP array.
   *
   * @param array|callable $callable
   *   The callable to process.
   *
   * @return callable
   *   The processed callable.
   */
  protected function dumpCallable($callable) {
    if (is_array($callable)) {
      $callable[0] = $this
        ->dumpValue($callable[0]);
      $callable = [
        $callable[0],
        $callable[1],
      ];
    }
    return $callable;
  }

  /**
   * Gets a private service definition in a suitable format.
   *
   * @param string $id
   *   The ID of the service to get a private definition for.
   * @param \Symfony\Component\DependencyInjection\Definition $definition
   *   The definition to process.
   * @param bool $shared
   *   (optional) Whether the service will be shared with others.
   *   By default this parameter is FALSE.
   *
   * @return object
   *   A very lightweight private service value object.
   */
  protected function getPrivateServiceCall($id, Definition $definition, $shared = FALSE) {
    $service_definition = $this
      ->getServiceDefinition($definition);
    if (!$id) {
      $hash = Crypt::hashBase64(serialize($service_definition));
      $id = 'private__' . $hash;
    }
    return (object) [
      'type' => 'private_service',
      'id' => $id,
      'value' => $service_definition,
      'shared' => $shared,
    ];
  }

  /**
   * Dumps the value to PHP array format.
   *
   * @param mixed $value
   *   The value to dump.
   *
   * @return mixed
   *   The dumped value in a suitable format.
   *
   * @throws \Symfony\Component\DependencyInjection\Exception\RuntimeException
   *   When trying to dump object or resource.
   */
  protected function dumpValue($value) {
    if (is_array($value)) {
      $code = [];
      foreach ($value as $k => $v) {
        $code[$k] = $this
          ->dumpValue($v);
      }
      return $code;
    }
    elseif ($value instanceof Reference) {
      return $this
        ->getReferenceCall((string) $value, $value);
    }
    elseif ($value instanceof Definition) {
      return $this
        ->getPrivateServiceCall(NULL, $value);
    }
    elseif ($value instanceof Parameter) {
      return $this
        ->getParameterCall((string) $value);
    }
    elseif (is_string($value) && FALSE !== strpos($value, '%')) {
      if (preg_match('/^%([^%]+)%$/', $value, $matches)) {
        return $this
          ->getParameterCall($matches[1]);
      }
      else {
        $replaceParameters = function ($matches) {
          return $this
            ->getParameterCall($matches[2]);
        };

        // We cannot directly return the string value because it would
        // potentially not always be resolved in the dumpCollection() method.
        return (object) [
          'type' => 'raw',
          'value' => str_replace('%%', '%', preg_replace_callback('/(?<!%)(%)([^%]+)\\1/', $replaceParameters, $value)),
        ];
      }
    }
    elseif ($value instanceof Expression) {
      throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
    }
    elseif (is_object($value)) {

      // Drupal specific: Instantiated objects have a _serviceId parameter.
      if (isset($value->_serviceId)) {
        return $this
          ->getReferenceCall($value->_serviceId);
      }
      throw new RuntimeException('Unable to dump a service container if a parameter is an object without _serviceId.');
    }
    elseif (is_resource($value)) {
      throw new RuntimeException('Unable to dump a service container if a parameter is a resource.');
    }
    return $value;
  }

  /**
   * Gets a service reference for a reference in a suitable PHP array format.
   *
   * The main difference is that this function treats references to private
   * services differently and returns a private service reference instead of
   * a normal reference.
   *
   * @param string $id
   *   The ID of the service to get a reference for.
   * @param \Symfony\Component\DependencyInjection\Reference|null $reference
   *   (optional) The reference object to process; needed to get the invalid
   *   behavior value.
   *
   * @return string|object
   *   A suitable representation of the service reference.
   */
  protected function getReferenceCall($id, Reference $reference = NULL) {
    $invalid_behavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE;
    if ($reference !== NULL) {
      $invalid_behavior = $reference
        ->getInvalidBehavior();
    }

    // Private shared service.
    if (isset($this->aliases[$id])) {
      $id = $this->aliases[$id];
    }
    $definition = $this->container
      ->getDefinition($id);
    if (!$definition
      ->isPublic()) {

      // The ContainerBuilder does not share a private service, but this means a
      // new service is instantiated every time. Use a private shared service to
      // circumvent the problem.
      return $this
        ->getPrivateServiceCall($id, $definition, TRUE);
    }
    return $this
      ->getServiceCall($id, $invalid_behavior);
  }

  /**
   * Gets a service reference for an ID in a suitable PHP array format.
   *
   * @param string $id
   *   The ID of the service to get a reference for.
   * @param int $invalid_behavior
   *   (optional) The invalid behavior of the service.
   *
   * @return string|object
   *   A suitable representation of the service reference.
   */
  protected function getServiceCall($id, $invalid_behavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE) {
    return (object) [
      'type' => 'service',
      'id' => $id,
      'invalidBehavior' => $invalid_behavior,
    ];
  }

  /**
   * Gets a parameter reference in a suitable PHP array format.
   *
   * @param string $name
   *   The name of the parameter to get a reference for.
   *
   * @return string|object
   *   A suitable representation of the parameter reference.
   */
  protected function getParameterCall($name) {
    return (object) [
      'type' => 'parameter',
      'name' => $name,
    ];
  }

  /**
   * Whether this supports the machine-optimized format or not.
   *
   * @return bool
   *   TRUE if this supports machine-optimized format, FALSE otherwise.
   */
  protected function supportsMachineFormat() {
    return TRUE;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
OptimizedPhpArrayDumper::$aliases	protected	property	A list of container aliases.
OptimizedPhpArrayDumper::$serialize	protected	property	Whether to serialize service definitions or not.
OptimizedPhpArrayDumper::dump	public	function	Dumps the service container.
OptimizedPhpArrayDumper::dumpCallable	protected	function	Dumps callable to a PHP array.
OptimizedPhpArrayDumper::dumpCollection	protected	function	Dumps a collection to a PHP array.	1
OptimizedPhpArrayDumper::dumpMethodCalls	protected	function	Dumps method calls to a PHP array.
OptimizedPhpArrayDumper::dumpValue	protected	function	Dumps the value to PHP array format.
OptimizedPhpArrayDumper::escape	protected	function	Escapes parameters.
OptimizedPhpArrayDumper::getAliases	protected	function	Gets the aliases as a PHP array.
OptimizedPhpArrayDumper::getArray	public	function	Gets the service container definition as a PHP array.	1
OptimizedPhpArrayDumper::getParameterCall	protected	function	Gets a parameter reference in a suitable PHP array format.	1
OptimizedPhpArrayDumper::getParameters	protected	function	Gets parameters of the container as a PHP array.
OptimizedPhpArrayDumper::getPrivateServiceCall	protected	function	Gets a private service definition in a suitable format.
OptimizedPhpArrayDumper::getReferenceCall	protected	function	Gets a service reference for a reference in a suitable PHP array format.
OptimizedPhpArrayDumper::getServiceCall	protected	function	Gets a service reference for an ID in a suitable PHP array format.	1
OptimizedPhpArrayDumper::getServiceDefinition	protected	function	Gets a service definition as PHP array.
OptimizedPhpArrayDumper::getServiceDefinitions	protected	function	Gets services of the container as a PHP array.
OptimizedPhpArrayDumper::prepareParameters	protected	function	Prepares parameters for the PHP array dumping.
OptimizedPhpArrayDumper::supportsMachineFormat	protected	function	Whether this supports the machine-optimized format or not.	1