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<?php |
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namespace SilverStripe\FullTextSearch\Search\Processors; |
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use SilverStripe\Core\Config\Configurable; |
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/** |
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* Provides batching of search updates |
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*/ |
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abstract class SearchUpdateBatchedProcessor extends SearchUpdateProcessor |
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{ |
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use Configurable; |
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/** |
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* List of batches to be processed |
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* |
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* @var array |
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*/ |
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protected $batches; |
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/** |
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* Pointer to index of $batches assigned to $current. |
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* Set to 0 (first index) if not started, or count + 1 if completed. |
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* |
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* @var int |
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*/ |
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protected $currentBatch; |
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/** |
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* List of indexes successfully comitted in the current batch |
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* |
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* @var array |
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*/ |
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protected $completedIndexes; |
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/** |
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* Maximum number of record-states to process in one batch. |
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* Set to zero to process all records in a single batch |
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* |
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* @config |
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* @var int |
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*/ |
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private static $batch_size = 100; |
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/** |
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* Up to this number of additional ids can be added to any batch in order to reduce the number |
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* of batches |
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* |
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* @config |
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* @var int |
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*/ |
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private static $batch_soft_cap = 10; |
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public function __construct() |
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{ |
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parent::__construct(); |
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$this->batches = array(); |
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$this->setBatch(0); |
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} |
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/** |
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* Set the current batch index |
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* |
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* @param int $batch Index of the batch |
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*/ |
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protected function setBatch($batch) |
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{ |
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$this->currentBatch = $batch; |
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} |
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protected function getSource() |
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{ |
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if (isset($this->batches[$this->currentBatch])) { |
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return $this->batches[$this->currentBatch]; |
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} |
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} |
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/** |
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* Process the current queue |
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* |
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* @return boolean |
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*/ |
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public function process() |
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{ |
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// Skip blank queues |
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if (empty($this->batches)) { |
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return true; |
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} |
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// Don't re-process completed queue |
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if ($this->currentBatch >= count($this->batches)) { |
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return true; |
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} |
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// Send current patch to indexes |
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$this->prepareIndexes(); |
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// Advance to next batch if successful |
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$this->setBatch($this->currentBatch + 1); |
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return true; |
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} |
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/** |
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* Segments batches acording to the specified rules |
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* |
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* @param array $source Source input |
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* @return array Batches |
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*/ |
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protected function segmentBatches($source) |
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{ |
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// Measure batch_size |
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$batchSize = static::config()->get('batch_size'); |
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if ($batchSize === 0) { |
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return array($source); |
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} |
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$softCap = static::config()->get('batch_soft_cap'); |
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// Clear batches |
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$batches = array(); |
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$current = array(); |
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$currentSize = 0; |
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// Build batches from data |
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foreach ($source as $base => $statefulids) { |
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if (!$statefulids) { |
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continue; |
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} |
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foreach ($statefulids as $stateKey => $statefulid) { |
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$state = $statefulid['state']; |
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$ids = $statefulid['ids']; |
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if (!$ids) { |
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continue; |
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} |
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// Extract items from $ids until empty |
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while ($ids) { |
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// Estimate maximum number of items to take for this iteration, allowing for the soft cap |
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$take = $batchSize - $currentSize; |
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if (count($ids) <= $take + $softCap) { |
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$take += $softCap; |
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} |
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$items = array_slice($ids, 0, $take, true); |
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$ids = array_slice($ids, count($items), null, true); |
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// Update batch |
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$currentSize += count($items); |
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$merge = array( |
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$base => array( |
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$stateKey => array( |
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'state' => $state, |
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'ids' => $items |
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) |
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) |
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); |
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$current = $current ? array_merge_recursive($current, $merge) : $merge; |
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if ($currentSize >= $batchSize) { |
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$batches[] = $current; |
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$current = array(); |
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$currentSize = 0; |
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} |
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} |
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} |
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} |
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// Add incomplete batch |
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if ($currentSize) { |
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$batches[] = $current; |
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} |
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return $batches; |
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} |
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public function batchData() |
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{ |
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$this->batches = $this->segmentBatches($this->dirty); |
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$this->setBatch(0); |
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} |
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public function triggerProcessing() |
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{ |
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$this->batchData(); |
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} |
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} |
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