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<?php |
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namespace Drupal\graphql\GraphQL\Buffers; |
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/** |
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* Base class for field buffering services. |
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*/ |
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abstract class BufferBase { |
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/** |
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* The the array of buffers. |
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* |
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* @var \SplObjectStorage[] |
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*/ |
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protected $buffers = []; |
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/** |
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* The array of result sets. |
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* |
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* @var \SplObjectStorage[] |
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*/ |
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protected $results = []; |
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/** |
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* @param object $item |
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* The item to get the buffer id for. |
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* @return string |
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* The buffer id. |
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*/ |
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protected function getBufferId($item) { |
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return ""; |
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} |
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/** |
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* Helper function to create a resolver for a singular buffer. |
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* |
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* @param object $item |
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* The item to add to the buffer. |
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* |
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* @return \Closure |
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* The callback to invoke to load the result for this buffer item. |
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*/ |
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protected function createBufferResolver($item) { |
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$bufferId = $this->getBufferId($item); |
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if (!isset($this->buffers[$bufferId])) { |
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$this->buffers[$bufferId] = new \SplObjectStorage(); |
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} |
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if (!isset($this->results[$bufferId])) { |
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$this->results[$bufferId] = new \SplObjectStorage(); |
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} |
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// Add the created item to the buffer. |
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$this->buffers[$bufferId]->attach($item, $item); |
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// Return a callback that can be used to resolve the buffer item. |
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return $this->createResolver($item, $this->buffers[$bufferId], $this->results[$bufferId]); |
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} |
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/** |
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* Creates a callback to invoke to load the result for this buffer item. |
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* |
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* @param object $item |
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* The item to add to create the resolver for. |
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* @param \SplObjectStorage $buffer |
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* The buffer. |
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* @param \SplObjectStorage $result |
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* The result set. |
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* |
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* @return \Closure |
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* The callback to invoke to load the result for this buffer item. |
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*/ |
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protected function createResolver($item, \SplObjectStorage $buffer, \SplObjectStorage $result) { |
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// Return the closure that will resolve and return the result for the item. |
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return function () use ($item, $buffer, $result) { |
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return $this->resolveItem($item, $buffer, $result); |
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}; |
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} |
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/** |
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* Returns the result of the given item after processing the buffer if needed. |
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* |
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* @param object $item |
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* The buffer item to retrieve the result for. |
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* @param \SplObjectStorage $buffer |
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* The buffer. |
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* @param \SplObjectStorage $result |
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* The result set. |
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* |
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* @return mixed |
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* The result of resolving the given buffer item. |
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*/ |
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protected function resolveItem($item, \SplObjectStorage $buffer, \SplObjectStorage $result) { |
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if ($buffer->contains($item)) { |
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$results = $this->resolveBuffer($buffer); |
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// Remove the resolved items from the buffer and add them to the results. |
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$buffer->removeAll($results); |
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$result->addAll($results); |
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} |
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if ($result->contains($item)) { |
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return $result[$item]; |
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} |
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throw new \LogicException('Failed to resolve item.'); |
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} |
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/** |
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* Resolves the given buffer wholly. |
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* |
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* @param \SplObjectStorage $buffer |
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* The buffer to be resolved wholly. |
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* |
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* @return \SplObjectStorage |
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* The resolved results for the given buffer, keyed by the corresponding |
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* buffer items. |
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*/ |
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protected function resolveBuffer(\SplObjectStorage $buffer) { |
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// Convert the buffer to an array that we can later use to map the results |
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// to the correct batch items. |
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$buffer = iterator_to_array($buffer, FALSE); |
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// Assign the loaded items to their corresponding batch items. |
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$output = new \SplObjectStorage(); |
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foreach ($this->resolveBufferArray($buffer) as $key => $item) { |
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$output->attach($buffer[$key], $item); |
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} |
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return $output; |
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} |
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/** |
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* Resolve the buffer as an array. |
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* |
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* Simplifies sub-class implementations by concealing the object storage |
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* details of the buffer object. |
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* |
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* @param array $buffer |
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* The buffer as an array. |
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* |
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* @return array |
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* The resolved results, keyed by their corresponding buffer item array key. |
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*/ |
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protected function resolveBufferArray(array $buffer) { |
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throw new \LogicException('Method not implemented.'); |
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} |
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} |
drupal-graphql /
graphql
