*/
class JobQueueDB extends JobQueue {
const CACHE_TTL_SHORT = 30; // integer; seconds to cache info without re-validating
- const CACHE_TTL_LONG = 300; // integer; seconds to cache info that is kept up to date
const MAX_AGE_PRUNE = 604800; // integer; seconds a job can live once claimed
const MAX_JOB_RANDOM = 2147483647; // integer; 2^31 - 1, used for job_random
const MAX_OFFSET = 255; // integer; maximum number of rows to skip
* @return bool
*/
protected function doIsEmpty() {
- $key = $this->getCacheKey( 'empty' );
-
- $isEmpty = $this->cache->get( $key );
- if ( $isEmpty === 'true' ) {
- return true;
- } elseif ( $isEmpty === 'false' ) {
- return false;
- }
-
$dbr = $this->getSlaveDB();
try {
$found = $dbr->selectField( // unclaimed job
} catch ( DBError $e ) {
$this->throwDBException( $e );
}
- $this->cache->add( $key, $found ? 'false' : 'true', self::CACHE_TTL_LONG );
return !$found;
}
$dbw->commit( $method );
}
- $this->cache->set( $this->getCacheKey( 'empty' ), 'false', JobQueueDB::CACHE_TTL_LONG );
-
return;
}
* @return Job|bool
*/
protected function doPop() {
- if ( $this->cache->get( $this->getCacheKey( 'empty' ) ) === 'true' ) {
- return false; // queue is empty
- }
-
$dbw = $this->getMasterDB();
try {
$dbw->commit( __METHOD__, 'flush' ); // flush existing transaction
}
// Check if we found a row to reserve...
if ( !$row ) {
- $this->cache->set( $this->getCacheKey( 'empty' ), 'true', self::CACHE_TTL_LONG );
break; // nothing to do
}
JobQueue::incrStats( 'job-pop', $this->type );
* @return void
*/
protected function doFlushCaches() {
- foreach ( array( 'empty', 'size', 'acquiredcount' ) as $type ) {
+ foreach ( array( 'size', 'acquiredcount' ) as $type ) {
$this->cache->delete( $this->getCacheKey( $type ) );
}
}
$affected = $dbw->affectedRows();
$count += $affected;
JobQueue::incrStats( 'job-recycle', $this->type, $affected );
- // The tasks recycled jobs or release delayed jobs into the queue
- $this->cache->set( $this->getCacheKey( 'empty' ), 'false', self::CACHE_TTL_LONG );
$this->aggr->notifyQueueNonEmpty( $this->wiki, $this->type );
}
}