git.m6w6.name Git - m6w6/pq-gateway/blob - lib/pq/Gateway/Table/OptimisticLock.php

   1 <?php
   2
   3 namespace pq\Gateway\Table;
   4
   5 use \pq\Gateway\Row;
   6
   7 /**
   8  * An optimistic row lock implementation using a versioning column
   9  */
  10 class OptimisticLock implements \SplObserver
  11 {
  12         /**
  13          * The name of the versioning column
  14          * @var string
  15          */
  16         protected $column;
  17
  18         /**
  19          * @param string $column
  20          */
  21         function __construct($column = "version") {
  22                 $this->column = $column;
  23         }
  24
  25         /**
  26          * @param \pq\Gateway\Table $table
  27          * @param \pq\Gateway\Row $row
  28          * @param string $event create/update/delete
  29          * @param array $where reference to the criteria
  30          */
  31         function update(\SplSubject $table, Row $row = null, $event = null, array &$where = null) {
  32                 if ($event === "update") {
  33                         $where["{$this->column}="] = $row->getData()[$this->column];
  34                         $row->{$this->column}->mod(+1);
  35                 }
  36         }
  37 }