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Scheduler transaction improvement and preferences transaction removal

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* Added a transaction to createAndFillShowInstancesPastPopulatedUntilDate
  to ensure two requests don't trigger duplicate repeated show instances
  in the calendar.
* Removed the transaction from setValue() in Preference and opt for
  a row-level lock instead.
This commit is contained in:
Albert Santoni 2015-09-02 10:40:38 -04:00
parent c7d926f8e8
commit 6959c459cd
2 changed files with 25 additions and 12 deletions
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13
airtime_mvc/application/models/Preference.php
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@ -28,7 +28,9 @@ class Application_Model_Preference
{
$cache = new Cache();
$con = Propel::getConnection(CcPrefPeer::DATABASE_NAME);
$con->beginTransaction();
//We are using row-level locking in Postgres via "FOR UPDATE" instead of a transaction here
//because sometimes this function needs to be called while a transaction is already started.
try {
/* Comment this out while we reevaluate it in favor of a unique constraint
@ -40,7 +42,7 @@ class Application_Model_Preference
}
//Check if key already exists
$sql = "SELECT COUNT(*) FROM cc_pref"
$sql = "SELECT valstr FROM cc_pref"
." WHERE keystr = :key";
$paramMap = array();
@ -50,13 +52,16 @@ class Application_Model_Preference
if ($isUserValue) {
$sql .= " AND subjid = :id";
$paramMap[':id'] = $userId;
}
}
$sql .= " FOR UPDATE";
$result = Application_Common_Database::prepareAndExecute($sql,
$paramMap,
Application_Common_Database::COLUMN,
PDO::FETCH_ASSOC,
$con);
$result = count($result);
$paramMap = array();
if ($result > 1) {
@ -103,9 +108,7 @@ class Application_Model_Preference
PDO::FETCH_ASSOC,
$con);
$con->commit();
} catch (Exception $e) {
$con->rollback();
header('HTTP/1.0 503 Service Unavailable');
Logging::info("Database error: ".$e->getMessage());
exit;