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<?php |
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/** |
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* Defines the TraderInteractive\Mongo\Queue class. |
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*/ |
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namespace TraderInteractive\Mongo; |
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use ArrayObject; |
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use MongoDB\BSON\ObjectID; |
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use MongoDB\BSON\UTCDateTime; |
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use MongoDB\Operation\FindOneAndUpdate; |
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/** |
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* Abstraction of mongo db collection as priority queue. |
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* |
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* Tied priorities are ordered by time. So you may use a single priority for normal queuing (default args exist for |
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* this purpose). Using a random priority achieves random get() |
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*/ |
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abstract class AbstractQueue |
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{ |
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/** |
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* Maximum millisecond value to use for UTCDateTime creation. |
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* |
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* @var integer |
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*/ |
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const MONGO_INT32_MAX = PHP_INT_MAX; |
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/** |
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* mongo collection to use for queue. |
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* |
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* @var \MongoDB\Collection |
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*/ |
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protected $collection; |
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/** |
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* @var array |
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*/ |
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const FIND_ONE_AND_UPDATE_OPTIONS = [ |
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'sort' => ['priority' => 1, 'created' => 1], |
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'typeMap' => ['root' => 'array', 'document' => 'array', 'array' => 'array'], |
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'returnDocument' => FindOneAndUpdate::RETURN_DOCUMENT_AFTER, |
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]; |
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/** |
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* @var integer |
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*/ |
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const DEFAULT_MAX_NUMBER_OF_MESSAGES = 1; |
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/** |
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* @var integer |
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*/ |
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const DEFAULT_RUNNING_RESET_DURATION = 600000; |
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/** |
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* @var integer |
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*/ |
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const DEFAULT_WAIT_DURATION_IN_MILLISECONDS = 3000; |
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/** |
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* @var integer |
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*/ |
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const DEFAULT_POLL_DURATION_IN_MILLISECONDS = 200; |
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/** |
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* @var array |
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*/ |
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const DEFAULT_GET_OPTIONS = [ |
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'maxNumberOfMessages' => self::DEFAULT_MAX_NUMBER_OF_MESSAGES, |
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'runningResetDuration' => self::DEFAULT_RUNNING_RESET_DURATION, |
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'waitDurationInMillis' => self::DEFAULT_WAIT_DURATION_IN_MILLISECONDS, |
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'pollDurationInMillis' => self::DEFAULT_POLL_DURATION_IN_MILLISECONDS, |
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]; |
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/** |
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* Ensure an index for the get() method. |
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* |
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* @param array $beforeSort Fields in get() call to index before the sort field in same format |
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* as \MongoDB\Collection::ensureIndex() |
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* @param array $afterSort Fields in get() call to index after the sort field in same format as |
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* \MongoDB\Collection::ensureIndex() |
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* |
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* @return void |
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* |
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* @throws \InvalidArgumentException value of $beforeSort or $afterSort is not 1 or -1 for ascending and descending |
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* @throws \InvalidArgumentException key in $beforeSort or $afterSort was not a string |
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*/ |
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final public function ensureGetIndex(array $beforeSort = [], array $afterSort = []) |
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{ |
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//using general rule: equality, sort, range or more equality tests in that order for index |
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$completeFields = ['earliestGet' => 1]; |
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$this->verifySort($beforeSort, 'beforeSort', $completeFields); |
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$completeFields['priority'] = 1; |
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$completeFields['created'] = 1; |
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$this->verifySort($afterSort, 'afterSort', $completeFields); |
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//for the main query in get() |
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$this->ensureIndex($completeFields); |
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} |
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/** |
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* Ensure an index for the count() method. |
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* Is a no-op if the generated index is a prefix of an existing one. If you have a similar ensureGetIndex call, |
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* call it first. |
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* |
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* @param array $fields fields in count() call to index in same format as \MongoDB\Collection::createIndex() |
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* @param bool $includeRunning whether to include the running field in the index |
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* |
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* @return void |
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* |
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* @throws \InvalidArgumentException key in $fields was not a string |
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* @throws \InvalidArgumentException value of $fields is not 1 or -1 for ascending and descending |
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*/ |
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final public function ensureCountIndex(array $fields, bool $includeRunning) |
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{ |
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$completeFields = []; |
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if ($includeRunning) { |
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$completeFields['earliestGet'] = 1; |
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} |
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$this->verifySort($fields, 'fields', $completeFields); |
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$this->ensureIndex($completeFields); |
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} |
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/** |
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* Get a non running message from the queue. |
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* |
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* @param array $query in same format as \MongoDB\Collection::find() where top level fields do not contain |
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* operators. Lower level fields can however. eg: valid {a: {$gt: 1}, "b.c": 3}, |
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* invalid {$and: [{...}, {...}]} |
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* @param array $options Associative array of get options. |
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* runningResetDuration => integer |
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* The duration (in miiliseconds) that the received messages are hidden from |
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* subsequent retrieve requests after being retrieved by a get() request. |
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* waitDurationInMillis => integer |
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* The duration (in milliseconds) for which the call will wait for a message to |
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* arrive in the queue before returning. If a message is available, the call will |
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* return sooner than WaitTimeSeconds. |
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* pollDurationInMillis => integer |
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* The millisecond duration to wait between polls. |
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* maxNumberOfMessages => integer |
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* The maximum number of messages to return with get(). All of the messages are not |
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* necessarily returned. |
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* |
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* @return array Array of messages. |
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* |
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* @throws \InvalidArgumentException key in $query was not a string |
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*/ |
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final public function get(array $query, array $options = []) : array |
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{ |
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$completeQuery = $this->buildPayloadQuery( |
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['earliestGet' => ['$lte' => new UTCDateTime((int)(microtime(true) * 1000))]], |
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$query |
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); |
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$options += self::DEFAULT_GET_OPTIONS; |
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$update = ['$set' => ['earliestGet' => $this->calculateEarliestGet($options['runningResetDuration'])]]; |
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$end = $this->calculateEndTime($options['waitDurationInMillis']); |
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$sleepTime = $this->calculateSleepTime($options['pollDurationInMillis']); |
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$messages = new ArrayObject(); |
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while (count($messages) < $options['maxNumberOfMessages']) { |
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if ($this->tryFindOneAndUpdate($completeQuery, $update, $messages)) { |
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continue; |
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} |
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if (microtime(true) < $end) { |
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usleep($sleepTime); |
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} |
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break; |
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} |
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return $messages->getArrayCopy(); |
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} |
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/** |
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* Count queue messages. |
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* |
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* @param array $query in same format as \MongoDB\Collection::find() where top level fields do not contain |
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* operators. Lower level fields can however. eg: valid {a: {$gt: 1}, "b.c": 3}, |
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* invalid {$and: [{...}, {...}]} |
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* @param bool|null $running query a running message or not or all |
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* |
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* @return int the count |
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* |
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* @throws \InvalidArgumentException key in $query was not a string |
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*/ |
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final public function count(array $query, bool $running = null) : int |
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{ |
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$totalQuery = []; |
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if ($running === true || $running === false) { |
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$key = $running ? '$gt' : '$lte'; |
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$totalQuery['earliestGet'] = [$key => new UTCDateTime((int)(microtime(true) * 1000))]; |
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} |
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return $this->collection->countDocuments($this->buildPayloadQuery($totalQuery, $query)); |
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} |
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/** |
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* Acknowledge a message was processed and remove from queue. |
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* |
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* @param Message $message message received from get() |
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* |
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* @return void |
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*/ |
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final public function ack(Message $message) |
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{ |
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$this->collection->deleteOne(['_id' => $message->getId()]); |
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} |
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/** |
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* Atomically acknowledge and send a message to the queue. |
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* |
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* @param Message $message message received from get(). |
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* |
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* @return void |
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*/ |
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final public function requeue(Message $message) |
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{ |
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$set = [ |
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'payload' => $message->getPayload(), |
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'earliestGet' => $message->getEarliestGet(), |
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'priority' => $message->getPriority(), |
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'machineName' => gethostname(), |
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'created' => new UTCDateTime(), |
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]; |
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$this->collection->updateOne(['_id' => $message->getId()], ['$set' => $set], ['upsert' => true]); |
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} |
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/** |
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* Send a message to the queue. |
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* |
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* @param Message $message The message to send. |
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* |
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* @return void |
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*/ |
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final public function send(Message $message) |
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{ |
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$document = [ |
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'_id' => $message->getId(), |
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'payload' => $message->getPayload(), |
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'earliestGet' => $message->getEarliestGet(), |
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'priority' => $message->getPriority(), |
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'machineName' => gethostname(), |
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'created' => new UTCDateTime(), |
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]; |
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$this->collection->insertOne($document); |
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} |
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257
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/** |
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* Ensure index of correct specification and a unique name whether the specification or name already exist or not. |
259
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* Will not create index if $index is a prefix of an existing index |
260
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* |
261
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* @param array $index index to create in same format as \MongoDB\Collection::createIndex() |
262
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* |
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* @return void |
264
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* |
265
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* @throws \Exception couldnt create index after 5 attempts |
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*/ |
267
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private function ensureIndex(array $index) |
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{ |
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if ($this->isIndexIncludedInExistingIndex($index)) { |
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return; |
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} |
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273
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for ($i = 0; $i < 5; ++$i) { |
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if ($this->tryCreateIndex($index)) { |
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return; |
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} |
277
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} |
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279
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throw new \Exception('couldnt create index after 5 attempts'); |
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//@codeCoverageIgnoreEnd |
281
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} |
282
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283
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private function buildPayloadQuery(array $initialQuery, array $payloadQuery) |
284
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{ |
285
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foreach ($payloadQuery as $key => $value) { |
286
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if (!is_string($key)) { |
287
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throw new \InvalidArgumentException('key in $query was not a string'); |
288
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} |
289
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290
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$initialQuery["payload.{$key}"] = $value; |
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} |
292
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293
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return $initialQuery; |
294
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} |
295
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296
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private function calculateSleepTime(int $pollDurationInMillis) : int |
297
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{ |
298
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$pollDurationInMillis = max($pollDurationInMillis, 0); |
299
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$sleepTime = $pollDurationInMillis * 1000; |
300
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return $sleepTime; |
301
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} |
302
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303
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private function calculateEarliestGet(int $runningResetDuration) : UTCDateTime |
304
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{ |
305
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$resetTimestamp = time() + $runningResetDuration; |
306
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//ints overflow to floats, max at PHP_INT_MAX |
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return new UTCDateTime(min(max(0, $resetTimestamp * 1000), self::MONGO_INT32_MAX)); |
308
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} |
309
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310
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private function tryFindOneAndUpdate(array $query, array $update, ArrayObject $messages) : bool |
311
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{ |
312
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$document = $this->collection->findOneAndUpdate($query, $update, self::FIND_ONE_AND_UPDATE_OPTIONS); |
313
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if ($document === null) { |
314
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return false; |
315
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} |
316
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317
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$messages[] = new Message( |
318
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$document['_id'], |
319
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$document['payload'], |
320
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$document['earliestGet'], |
321
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$document['priority'] |
322
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); |
323
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324
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return true; |
325
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} |
326
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327
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private function isIndexIncludedInExistingIndex(array $index) : bool |
328
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{ |
329
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//if $index is a prefix of any existing index we are good |
330
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foreach ($this->collection->listIndexes() as $existingIndex) { |
331
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$slice = array_slice($existingIndex['key'], 0, count($index), true); |
332
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if ($slice === $index) { |
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return true; |
334
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} |
335
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} |
336
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337
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return false; |
338
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} |
339
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340
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private function tryCreateIndex(array $index) : bool |
341
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{ |
342
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for ($name = uniqid(); strlen($name) > 0; $name = substr($name, 0, -1)) { |
343
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if ($this->tryCreateNamedIndex($index, $name)) { |
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return true; |
345
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} |
346
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} |
347
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348
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return false; |
349
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} |
350
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351
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private function tryCreateNamedIndex(array $index, string $name) : bool |
352
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{ |
353
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//creating an index with same name and different spec does nothing. |
354
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//creating an index with same spec and different name does nothing. |
355
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//so we use any generated name, and then find the right spec after we have called, |
356
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//and just go with that name. |
357
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try { |
358
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$this->collection->createIndex($index, ['name' => $name, 'background' => true]); |
359
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} catch (\MongoDB\Exception\Exception $e) { |
360
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//this happens when the name was too long, let continue |
361
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} |
362
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363
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return $this->indexExists($index); |
364
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} |
365
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366
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private function indexExists(array $index) : bool |
367
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{ |
368
|
|
|
foreach ($this->collection->listIndexes() as $existingIndex) { |
369
|
|
|
if ($existingIndex['key'] === $index) { |
370
|
|
|
return true; |
371
|
|
|
} |
372
|
|
|
} |
373
|
|
|
|
374
|
|
|
return false; |
375
|
|
|
} |
376
|
|
|
|
377
|
|
|
/** |
378
|
|
|
* Helper method to validate keys and values for the given sort array |
379
|
|
|
* |
380
|
|
|
* @param array $sort The proposed sort for a mongo index. |
381
|
|
|
* @param string $label The name of the variable given to the public ensureXIndex method. |
382
|
|
|
* @param array &$completedFields The final index array with payload. prefix added to fields. |
383
|
|
|
* |
384
|
|
|
* @return void |
385
|
|
|
*/ |
386
|
|
|
private function verifySort(array $sort, string $label, array &$completeFields) |
387
|
|
|
{ |
388
|
|
|
foreach ($sort as $key => $value) { |
389
|
|
|
$this->throwIfTrue(!is_string($key), "key in \${$label} was not a string"); |
390
|
|
|
$this->throwIfTrue( |
391
|
|
|
$value !== 1 && $value !== -1, |
392
|
|
|
"value of \${$label} is not 1 or -1 for ascending and descending" |
393
|
|
|
); |
394
|
|
|
|
395
|
|
|
$completeFields["payload.{$key}"] = $value; |
396
|
|
|
} |
397
|
|
|
} |
398
|
|
|
|
399
|
|
|
private function throwIfTrue( |
400
|
|
|
bool $condition, |
401
|
|
|
string $message, |
402
|
|
|
string $exceptionClass = '\\InvalidArgumentException' |
403
|
|
|
) { |
404
|
|
|
if ($condition === true) { |
405
|
|
|
$reflectionClass = new \ReflectionClass($exceptionClass); |
406
|
|
|
throw $reflectionClass->newInstanceArgs([$message]); |
407
|
|
|
} |
408
|
|
|
} |
409
|
|
|
|
410
|
|
|
private function calculateEndTime(int $waitDurationInMillis) : float |
411
|
|
|
{ |
412
|
|
|
return microtime(true) + ($waitDurationInMillis / 1000.0); |
413
|
|
|
} |
414
|
|
|
} |
415
|
|
|
|