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<?php |
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/* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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use Alcaeus\MongoDbAdapter\TypeConverter; |
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use Alcaeus\MongoDbAdapter\Helper\WriteConcernConverter; |
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/** |
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* MongoWriteBatch allows you to "batch up" multiple operations (of same type) |
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* and shipping them all to MongoDB at the same time. This can be especially |
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* useful when operating on many documents at the same time to reduce roundtrips. |
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* |
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* @see http://php.net/manual/en/class.mongowritebatch.php |
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*/ |
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class MongoWriteBatch |
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{ |
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use WriteConcernConverter; |
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const COMMAND_INSERT = 1; |
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const COMMAND_UPDATE = 2; |
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const COMMAND_DELETE = 3; |
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/** |
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* @var MongoCollection |
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*/ |
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private $collection; |
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/** |
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* @var int |
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*/ |
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private $batchType; |
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/** |
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* @var array |
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*/ |
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private $writeOptions; |
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/** |
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* @var array |
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*/ |
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private $items = []; |
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/** |
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* Creates a new batch of write operations |
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* |
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* @see http://php.net/manual/en/mongowritebatch.construct.php |
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* @param MongoCollection $collection |
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* @param int $batchType |
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* @param array $writeOptions |
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*/ |
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protected function __construct(MongoCollection $collection, $batchType, $writeOptions) |
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{ |
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$this->collection = $collection; |
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$this->batchType = $batchType; |
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$this->writeOptions = $writeOptions; |
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} |
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/** |
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* Adds a write operation to a batch |
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* |
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* @see http://php.net/manual/en/mongowritebatch.add.php |
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* @param array|object $item |
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* @return boolean |
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*/ |
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public function add($item) |
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{ |
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if (is_object($item)) { |
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$item = (array)$item; |
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} |
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$this->validate($item); |
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$this->addItem($item); |
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return true; |
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} |
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/** |
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* Executes a batch of write operations |
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* |
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* @see http://php.net/manual/en/mongowritebatch.execute.php |
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* @param array $writeOptions |
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* @return array |
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*/ |
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final public function execute(array $writeOptions = []) |
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{ |
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$writeOptions += $this->writeOptions; |
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if (! count($this->items)) { |
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return ['ok' => true]; |
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} |
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if (isset($writeOptions['j'])) { |
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trigger_error('j parameter is not supported', E_WARNING); |
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} |
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if (isset($writeOptions['fsync'])) { |
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trigger_error('fsync parameter is not supported', E_WARNING); |
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} |
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$options['writeConcern'] = $this->createWriteConcernFromArray($writeOptions); |
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if (isset($writeOptions['ordered'])) { |
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$options['ordered'] = $writeOptions['ordered']; |
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} |
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$collection = $this->collection->getCollection(); |
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try { |
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$result = $collection->BulkWrite($this->items, $options); |
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$ok = true; |
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} catch (\MongoDB\Driver\Exception\BulkWriteException $e) { |
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$result = $e->getWriteResult(); |
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$ok = false; |
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} |
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if ($ok === true) { |
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$this->items = []; |
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} |
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switch ($this->batchType) { |
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case self::COMMAND_UPDATE: |
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return [ |
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'nMatched' => $result->getMatchedCount(), |
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'nModified' => $result->getModifiedCount(), |
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'nUpserted' => $result->getUpsertedCount(), |
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'ok' => $ok, |
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]; |
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case self::COMMAND_DELETE: |
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return [ |
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'nRemoved' => $result->getDeletedCount(), |
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'ok' => $ok, |
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]; |
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case self::COMMAND_INSERT: |
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return [ |
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'nInserted' => $result->getInsertedCount(), |
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'ok' => $ok, |
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]; |
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} |
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} |
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private function validate(array $item) |
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{ |
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switch ($this->batchType) { |
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View Code Duplication |
case self::COMMAND_UPDATE: |
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if (! isset($item['q'])) { |
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throw new Exception("Expected $item to contain 'q' key"); |
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} |
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if (! isset($item['u'])) { |
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throw new Exception("Expected $item to contain 'u' key"); |
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} |
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break; |
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View Code Duplication |
case self::COMMAND_DELETE: |
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if (! isset($item['q'])) { |
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throw new Exception("Expected $item to contain 'q' key"); |
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} |
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if (! isset($item['limit'])) { |
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throw new Exception("Expected $item to contain 'limit' key"); |
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} |
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break; |
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} |
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} |
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private function addItem(array $item) |
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{ |
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switch ($this->batchType) { |
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case self::COMMAND_UPDATE: |
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$method = isset($item['multi']) ? 'updateMany' : 'updateOne'; |
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$options = []; |
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if (isset($item['upsert']) && $item['upsert']) { |
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$options['upsert'] = true; |
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} |
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$this->items[] = [$method => [TypeConverter::fromLegacy($item['q']), TypeConverter::fromLegacy($item['u']), $options]]; |
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break; |
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case self::COMMAND_INSERT: |
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$this->items[] = ['insertOne' => [TypeConverter::fromLegacy($item)]]; |
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break; |
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case self::COMMAND_DELETE: |
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$method = $item['limit'] === 0 ? 'deleteMany' : 'deleteOne'; |
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$this->items[] = [$method => [TypeConverter::fromLegacy($item['q'])]]; |
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break; |
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} |
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} |
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} |
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Adding an explicit array definition is generally preferable to implicit array definition as it guarantees a stable state of the code.
Let’s take a look at an example:
As you can see in this example, the array
$myArray
is initialized the first time when the foreach loop is entered. You can also see that the value of thebar
key is only written conditionally; thus, its value might result from a previous iteration.This might or might not be intended. To make your intention clear, your code more readible and to avoid accidental bugs, we recommend to add an explicit initialization $myArray = array() either outside or inside the foreach loop.