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<?php |
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namespace Tarantool\Mapper\Plugin; |
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use Carbon\Carbon; |
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use Exception; |
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use Tarantool\Mapper\Mapper; |
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use Tarantool\Mapper\Plugin; |
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class Temporal extends Plugin |
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{ |
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private $actor; |
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private $timestamps = []; |
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public function override(array $override) |
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{ |
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if (!$this->actor) { |
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throw new Exception("actor is undefined"); |
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} |
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if (array_key_exists('actor', $override)) { |
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throw new Exception("actor override is defined"); |
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} |
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if (array_key_exists('timestamp', $override)) { |
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throw new Exception("timestamp override is defined"); |
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} |
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foreach (['begin', 'end'] as $field) { |
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if (array_key_exists($field, $override)) { |
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if (is_string($override[$field])) { |
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$override[$field] = $this->getTimestamp($override[$field]); |
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} |
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} else { |
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$override[$field] = 0; |
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} |
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} |
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foreach ($override as $k => $v) { |
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if (!in_array($k, ['entity', 'id', 'begin', 'end', 'data'])) { |
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$override['entity'] = $k; |
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$override['id'] = $v; |
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unset($override[$k]); |
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} |
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} |
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if (!array_key_exists('entity', $override)) { |
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throw new Exception("no entity defined"); |
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} |
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if (!$this->mapper->getSchema()->hasSpace($override['entity'])) { |
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throw new Exception("invalid entity " . $override['entity']); |
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} |
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$space = $this->mapper->getSchema()->getSpace($override['entity']); |
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// set entity id |
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$override['entity'] = $space->getId(); |
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$override['actor'] = $this->actor; |
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$override['timestamp'] = Carbon::now()->timestamp; |
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$this->initSchema('override'); |
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$this->mapper->create('_override', $override); |
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$this->updateState($override); |
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} |
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public function setActor($actor) |
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{ |
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$this->actor = $actor; |
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return $this; |
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} |
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public function getState($entity, $id, $date) |
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{ |
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if (!$this->mapper->getSchema()->hasSpace($entity)) { |
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throw new Exception("invalid entity: " . $entity); |
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} |
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$entity = $this->mapper->getSchema()->getSpace($entity)->getId(); |
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$date = $this->getTimestamp($date); |
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$rows = $this->mapper->getClient()->getSpace('_override_aggregate') |
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->select([$entity, $id, $date], 0, 1, 0, 4) // [key, index, limit, offset, iterator = LE] |
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->getData(); |
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if (count($rows)) { |
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$state = $this->mapper->findOne('_override_aggregate', [ |
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'entity' => $entity, |
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'id' => $id, |
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'begin' => $rows[0][2] |
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]); |
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if (!$state->end || $state->end >= $date) { |
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return $state->data; |
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} |
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} |
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return []; |
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} |
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private function updateState($params) |
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{ |
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$params = [ |
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'entity' => $params['entity'], |
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'id' => $params['id'], |
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]; |
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$timeaxis = []; |
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$changeaxis = []; |
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foreach ($this->mapper->find('_override', $params) as $i => $override) { |
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foreach (['begin', 'end'] as $field) { |
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if (!array_key_exists($override->$field, $timeaxis)) { |
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$timeaxis[$override->$field] = [ |
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'begin' => $override->$field, |
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'end' => $override->$field, |
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'data' => [], |
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]; |
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} |
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} |
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if (!array_key_exists($override->timestamp, $changeaxis)) { |
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$changeaxis[$override->timestamp] = []; |
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} |
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$changeaxis[$override->timestamp][] = $override; |
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} |
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ksort($changeaxis); |
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ksort($timeaxis); |
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$nextSliceId = null; |
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foreach (array_reverse(array_keys($timeaxis)) as $timestamp) { |
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if ($nextSliceId) { |
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$timeaxis[$timestamp]['end'] = $nextSliceId; |
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} else { |
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$timeaxis[$timestamp]['end'] = 0; |
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} |
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$nextSliceId = $timestamp; |
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} |
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foreach ($this->mapper->find('_override_aggregate', $params) as $state) { |
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$this->mapper->remove($state); |
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} |
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$states = []; |
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foreach ($timeaxis as $state) { |
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foreach ($changeaxis as $overrides) { |
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foreach ($overrides as $override) { |
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if ($override->begin > $state['begin']) { |
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// future override |
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continue; |
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} |
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if ($override->end && ($override->end < $state['end'] || !$state['end'])) { |
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// complete override |
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continue; |
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} |
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$state['data'] = array_merge($state['data'], $override->data); |
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} |
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} |
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if (count($state['data'])) { |
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$states[] = array_merge($state, $params); |
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} |
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} |
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// merge states |
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$clean = false; |
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while (!$clean) { |
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$clean = true; |
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foreach ($states as $i => $state) { |
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if (array_key_exists($i+1, $states)) { |
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$next = $states[$i+1]; |
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if (!count(array_diff_assoc($state['data'], $next['data']))) { |
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$states[$i]['end'] = $next['end']; |
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unset($states[$i+1]); |
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$states = array_values($states); |
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$clean = false; |
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break; |
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} |
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} |
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} |
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} |
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foreach ($states as $state) { |
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$this->mapper->create('_override_aggregate', $state); |
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} |
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} |
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private function initSchema($name) |
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{ |
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switch ($name) { |
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case 'override': |
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return $this->mapper->getSchema()->once(__CLASS__.'_states', function (Mapper $mapper) { |
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$mapper->getSchema() |
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->createSpace('_override', [ |
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'entity' => 'unsigned', |
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'id' => 'unsigned', |
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'begin' => 'unsigned', |
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'end' => 'unsigned', |
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'timestamp' => 'unsigned', |
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'actor' => 'unsigned', |
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'data' => '*', |
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])->addIndex([ |
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'fields' => ['entity', 'id', 'begin', 'timestamp', 'actor'] |
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]); |
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$mapper->getSchema() |
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->createSpace('_override_aggregate', [ |
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'entity' => 'unsigned', |
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'id' => 'unsigned', |
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'begin' => 'unsigned', |
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'end' => 'unsigned', |
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'data' => '*', |
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]) |
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->addIndex([ |
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'fields' => ['entity', 'id', 'begin'], |
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]); |
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}); |
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} |
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throw new Exception("Invalid schema $name"); |
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} |
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private function getTimestamp($string) |
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{ |
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if (!array_key_exists($string, $this->timestamps)) { |
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$this->timestamps[$string] = Carbon::parse($string)->timestamp; |
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} |
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return $this->timestamps[$string]; |
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} |
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} |
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tarantool-php /
mapper
