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<?php
namespace Guzzle\Batch;
use Guzzle\Batch\Exception\BatchTransferException;
/**
* Default batch implementation used to convert queued items into smaller chunks of batches using a
* {@see BatchDivisorIterface} and transfers each batch using a {@see BatchTransferInterface}.
*
* Any exception encountered during a flush operation will throw a {@see BatchTransferException} object containing the
* batch that failed. After an exception is encountered, you can flush the batch again to attempt to finish transferring
* any previously created batches or queued items.
*/
class Batch implements BatchInterface
{
/** @var \SplQueue Queue of items in the queue */
protected $queue;
/** @var array Divided batches to be transferred */
protected $dividedBatches;
/** @var BatchTransferInterface */
protected $transferStrategy;
/** @var BatchDivisorInterface */
protected $divisionStrategy;
/**
* @param BatchTransferInterface $transferStrategy Strategy used to transfer items
* @param BatchDivisorInterface $divisionStrategy Divisor used to create batches
*/
public function __construct(BatchTransferInterface $transferStrategy, BatchDivisorInterface $divisionStrategy)
{
$this->transferStrategy = $transferStrategy;
$this->divisionStrategy = $divisionStrategy;
$this->queue = new \SplQueue();
$this->queue->setIteratorMode(\SplQueue::IT_MODE_DELETE);
$this->dividedBatches = array();
}
public function add($item)
{
$this->queue->enqueue($item);
return $this;
}
public function flush()
{
$this->createBatches();
$items = array();
foreach ($this->dividedBatches as $batchIndex => $dividedBatch) {
while ($dividedBatch->valid()) {
$batch = $dividedBatch->current();
$dividedBatch->next();
try {
$this->transferStrategy->transfer($batch);
$items = array_merge($items, $batch);
} catch (\Exception $e) {
throw new BatchTransferException($batch, $items, $e, $this->transferStrategy, $this->divisionStrategy);
}
}
// Keep the divided batch down to a minimum in case of a later exception
unset($this->dividedBatches[$batchIndex]);
}
return $items;
}
public function isEmpty()
{
return count($this->queue) == 0 && count($this->dividedBatches) == 0;
}
/**
* Create batches for any queued items
*/
protected function createBatches()
{
if (count($this->queue)) {
if ($batches = $this->divisionStrategy->createBatches($this->queue)) {
// Convert arrays into iterators
if (is_array($batches)) {
$batches = new \ArrayIterator($batches);
}
$this->dividedBatches[] = $batches;
}
}
}
}
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