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MappedSuperclassStreamStrategy.php
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MappedSuperclassStreamStrategy.php
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<?php
/*
* This file is part of the prooph/event-store.
* (c) Alexander Miertsch <contact@prooph.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* Date: 20.10.14 - 20:26
*/
namespace Prooph\EventStore\Stream;
use Prooph\EventStore\Aggregate\AggregateType;
use Prooph\EventStore\EventStore;
use Prooph\EventStore\Stream\MappedSuperclass\SuperclassAggregateTypeChanger;
/**
* Class MappedSuperclassStreamStrategy
*
* @package Prooph\EventStore\Stream
* @author Alexander Miertsch <kontakt@codeliner.ws>
*/
class MappedSuperclassStreamStrategy implements StreamStrategyInterface
{
/**
* @var EventStore
*/
protected $eventStore;
/**
* @var StreamName
*/
protected $streamName;
/**
* @var array
*/
protected $aggregateTypeStreamMap = array();
/**
* @var SuperclassAggregateTypeChanger
*/
protected $superclassAggregateTypeChanger;
/**
* @param EventStore $eventStore
* @param \Prooph\EventStore\Aggregate\AggregateType $superclass
* @param array $aggregateTypeStreamMap
*/
public function __construct(EventStore $eventStore, AggregateType $superclass, array $aggregateTypeStreamMap = array())
{
$this->eventStore = $eventStore;
$this->streamName = $this->buildStreamName($superclass);
$this->aggregateTypeStreamMap = $aggregateTypeStreamMap;
}
/**
* @param AggregateType $aggregateType
* @param string $aggregateId
* @param StreamEvent[] $streamEvents
* @return void
*/
public function add(AggregateType $aggregateType, $aggregateId, array $streamEvents)
{
\Assert\that($aggregateId)->string('AggregateId needs to be string');
foreach ( $streamEvents as $index => $streamEvent) {
$streamEvent->setMetadataEntry('aggregate_type', $aggregateType->toString());
$streamEvent->setMetadataEntry('aggregate_id', $aggregateId);
$streamEvents[$index] = $streamEvent;
}
$this->eventStore->appendTo($this->streamName, $streamEvents);
}
/**
* @param AggregateType $aggregateType
* @param string $aggregateId
* @param StreamEvent[] $streamEvents
* @return void
*/
public function appendEvents(AggregateType $aggregateType, $aggregateId, array $streamEvents)
{
\Assert\that($aggregateId)->string('AggregateId needs to be string');
foreach ( $streamEvents as $index => $streamEvent) {
$streamEvent->setMetadataEntry('aggregate_type', $aggregateType->toString());
$streamEvent->setMetadataEntry('aggregate_id', $aggregateId);
$streamEvents[$index] = $streamEvent;
}
$this->eventStore->appendTo($this->streamName, $streamEvents);
}
/**
* Pass the superclass AggregateType as first argument. It will be converted to the subclass AggregateType
* after reading the event stream for the aggregate. So you can use the AggregateType to reconstitute the aggregate
* with the correct subclass in place.
*
* @param AggregateType $aggregateType
* @param string $aggregateId
* @return StreamEvent[]
*/
public function read(AggregateType $aggregateType, $aggregateId)
{
\Assert\that($aggregateId)->string('AggregateId needs to be string');
$events = $this->eventStore->loadEventsByMetadataFrom(
$this->streamName,
array('aggregate_id' => $aggregateId)
);
if (count($events)) {
$first = $events[0];
$metadata = $first->metadata();
if (isset($metadata['aggregate_type'])) {
$this->getSuperclassAggregateTypeChanger()->convertToSubclassAggregateType(
$aggregateType,
$metadata['aggregate_type']
);
}
}
return $events;
}
/**
* @param AggregateType $aggregateType
* @return StreamName
*/
protected function buildStreamName(AggregateType $aggregateType)
{
if (isset($this->aggregateTypeStreamMap[$aggregateType->toString()])) {
return new StreamName($this->aggregateTypeStreamMap[$aggregateType->toString()]);
}
return new StreamName($aggregateType->toString());
}
/**
* @return SuperclassAggregateTypeChanger
*/
private function getSuperclassAggregateTypeChanger()
{
if (is_null($this->superclassAggregateTypeChanger)) {
$this->superclassAggregateTypeChanger = new SuperclassAggregateTypeChanger("__superclass__");
}
return $this->superclassAggregateTypeChanger;
}
}