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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Search\Iterators; |
| 4 | |
| 5 | use Flow\DbFactory; |
| 6 | use Flow\Model\PostRevision; |
| 7 | use Flow\Model\UUID; |
| 8 | use Flow\Repository\RootPostLoader; |
| 9 | use stdClass; |
| 10 | |
| 11 | class TopicIterator extends AbstractIterator { |
| 12 | /** |
| 13 | * @var PostRevision |
| 14 | */ |
| 15 | protected $previous; |
| 16 | |
| 17 | /** |
| 18 | * @var RootPostLoader |
| 19 | */ |
| 20 | protected $rootPostLoader; |
| 21 | |
| 22 | /** |
| 23 | * @var bool |
| 24 | */ |
| 25 | public $orderByUUID = false; |
| 26 | |
| 27 | /** |
| 28 | * @param DbFactory $dbFactory |
| 29 | * @param RootPostLoader $rootPostLoader |
| 30 | */ |
| 31 | public function __construct( DbFactory $dbFactory, RootPostLoader $rootPostLoader ) { |
| 32 | parent::__construct( $dbFactory ); |
| 33 | $this->rootPostLoader = $rootPostLoader; |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * Define where to start iterating (inclusive) |
| 38 | * |
| 39 | * We'll be querying the workflow table instead of the revisions table. |
| 40 | * Because it's possible to request only a couple of revisions (in between |
| 41 | * certain ids), we'll need to override the parent buildQueryConditions |
| 42 | * method to also work on the workflow table. |
| 43 | * A topic workflow is updated with a workflow_last_update_timestamp for |
| 44 | * every change made in the topic. Our UUIDs are sequential & time-based, |
| 45 | * so we can just query for workflows with a timestamp higher than the |
| 46 | * timestamp derived from the starting UUID and lower than the end UUID. |
| 47 | * |
| 48 | * @param UUID|null $revId |
| 49 | */ |
| 50 | public function setFrom( ?UUID $revId = null ) { |
| 51 | $this->results = null; |
| 52 | |
| 53 | unset( $this->conditions[0] ); |
| 54 | if ( $revId !== null ) { |
| 55 | $this->conditions[0] = $this->dbr->expr( 'workflow_last_update_timestamp', '>=', |
| 56 | $this->dbr->timestamp( $revId->getBinary() ) ); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Define where to stop iterating (exclusive) |
| 62 | * |
| 63 | * We'll be querying the workflow table instead of the revisions table. |
| 64 | * Because it's possible to request only a couple of revisions (in between |
| 65 | * certain ids), we'll need to override the parent buildQueryConditions |
| 66 | * method to also work on the workflow table. |
| 67 | * A topic workflow is updated with a workflow_last_update_timestamp for |
| 68 | * every change made in the topic. Our UUIDs are sequential & time-based, |
| 69 | * so we can just query for workflows with a timestamp higher than the |
| 70 | * timestamp derived from the starting UUID and lower than the end UUID. |
| 71 | * |
| 72 | * @param UUID|null $revId |
| 73 | */ |
| 74 | public function setTo( ?UUID $revId = null ) { |
| 75 | $this->results = null; |
| 76 | |
| 77 | unset( $this->conditions[1] ); |
| 78 | if ( $revId !== null ) { |
| 79 | $this->conditions[1] = $this->dbr->expr( 'workflow_last_update_timestamp', '<', |
| 80 | $this->dbr->timestamp( $revId->getBinary() ) ); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Instead of querying for revisions (which is what we actually need), we'll |
| 86 | * just query the workflow table, which will save us some complicated joins. |
| 87 | * The workflow_id for a topic title (aka root post) is the same as its |
| 88 | * collection id, so we can pass that to the root post loader and *poof*, we |
| 89 | * have our revisions! |
| 90 | * |
| 91 | * @inheritDoc |
| 92 | */ |
| 93 | protected function query() { |
| 94 | if ( $this->orderByUUID ) { |
| 95 | $order = 'workflow_id'; |
| 96 | } else { |
| 97 | $order = 'workflow_last_update_timestamp'; |
| 98 | } |
| 99 | return $this->dbr->newSelectQueryBuilder() |
| 100 | // for root post (topic title), workflow_id is the same as its rev_type_id |
| 101 | ->select( [ 'workflow_id', 'workflow_last_update_timestamp' ] ) |
| 102 | ->from( 'flow_workflow' ) |
| 103 | ->where( [ 'workflow_type' => 'topic' ] ) |
| 104 | ->andWhere( $this->conditions ) |
| 105 | ->orderBy( $order ) |
| 106 | ->caller( __METHOD__ ) |
| 107 | ->fetchResultSet(); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * @inheritDoc |
| 112 | */ |
| 113 | protected function transform( stdClass $row ) { |
| 114 | $root = UUID::create( $row->workflow_id ); |
| 115 | |
| 116 | // we need to fetch all data via rootloader because we'll want children |
| 117 | // to be populated |
| 118 | return $this->rootPostLoader->get( $root ); |
| 119 | } |
| 120 | } |