* not distinguishable from the race condition between isEmpty() and pop().
*
* @return bool
- * @throws MWException
+ * @throws JobQueueError
*/
final public function isEmpty() {
wfProfileIn( __METHOD__ );
* If caching is used, this number might be out of date for a minute.
*
* @return integer
- * @throws MWException
+ * @throws JobQueueError
*/
final public function getSize() {
wfProfileIn( __METHOD__ );
* If caching is used, this number might be out of date for a minute.
*
* @return integer
- * @throws MWException
+ * @throws JobQueueError
*/
final public function getAcquiredCount() {
wfProfileIn( __METHOD__ );
* If caching is used, this number might be out of date for a minute.
*
* @return integer
- * @throws MWException
+ * @throws JobQueueError
* @since 1.22
*/
final public function getDelayedCount() {
* If caching is used, this number might be out of date for a minute.
*
* @return integer
- * @throws MWException
+ * @throws JobQueueError
*/
final public function getAbandonedCount() {
wfProfileIn( __METHOD__ );
* @param $jobs Job|Array
* @param $flags integer Bitfield (supports JobQueue::QOS_ATOMIC)
* @return bool Returns false on failure
- * @throws MWException
+ * @throws JobQueueError
*/
final public function push( $jobs, $flags = 0 ) {
return $this->batchPush( is_array( $jobs ) ? $jobs : array( $jobs ), $flags );
* @param array $jobs List of Jobs
* @param $flags integer Bitfield (supports JobQueue::QOS_ATOMIC)
* @return bool Returns false on failure
- * @throws MWException
+ * @throws JobQueueError
*/
final public function batchPush( array $jobs, $flags = 0 ) {
if ( !count( $jobs ) ) {
* Outside callers should use JobQueueGroup::pop() instead of this function.
*
* @return Job|bool Returns false if there are no jobs
- * @throws MWException
+ * @throws JobQueueError
*/
final public function pop() {
global $wgJobClasses;
*
* @param $job Job
* @return bool
- * @throws MWException
+ * @throws JobQueueError
*/
final public function ack( Job $job ) {
if ( $job->getType() !== $this->type ) {
*
* @param $job Job
* @return bool
- * @throws MWException
+ * @throws JobQueueError
*/
final public function deduplicateRootJob( Job $job ) {
if ( $job->getType() !== $this->type ) {
*
* @param $job Job
* @return bool
- * @throws MWException
+ * @throws JobQueueError
*/
final protected function isRootJobOldDuplicate( Job $job ) {
if ( $job->getType() !== $this->type ) {
* Deleted all unclaimed and delayed jobs from the queue
*
* @return bool Success
- * @throws MWException
+ * @throws JobQueueError
* @since 1.22
*/
final public function delete() {
* This does nothing for certain queue classes.
*
* @return void
- * @throws MWException
+ * @throws JobQueueError
*/
final public function waitForBackups() {
wfProfileIn( __METHOD__ );
* Note: results may be stale if the queue is concurrently modified.
*
* @return Iterator
- * @throws MWException
+ * @throws JobQueueError
*/
abstract public function getAllQueuedJobs();
* Note: results may be stale if the queue is concurrently modified.
*
* @return Iterator
- * @throws MWException
+ * @throws JobQueueError
* @since 1.22
*/
public function getAllDelayedJobs() {
throw new MWException( "Queue namespacing not supported for this queue type." );
}
}
+
+/**
+ * @ingroup JobQueue
+ * @since 1.22
+ */
+class JobQueueError extends MWException {}
+class JobQueueConnectionError extends JobQueueError {}
}
list( $dbr, $scope ) = $this->getSlaveDB();
- $found = $dbr->selectField( // unclaimed job
- 'job', '1', array( 'job_cmd' => $this->type, 'job_token' => '' ), __METHOD__
- );
+ try {
+ $found = $dbr->selectField( // unclaimed job
+ 'job', '1', array( 'job_cmd' => $this->type, 'job_token' => '' ), __METHOD__
+ );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
+ }
$this->cache->add( $key, $found ? 'false' : 'true', self::CACHE_TTL_LONG );
return !$found;
return $size;
}
- list( $dbr, $scope ) = $this->getSlaveDB();
- $size = (int)$dbr->selectField( 'job', 'COUNT(*)',
- array( 'job_cmd' => $this->type, 'job_token' => '' ),
- __METHOD__
- );
+ try {
+ list( $dbr, $scope ) = $this->getSlaveDB();
+ $size = (int)$dbr->selectField( 'job', 'COUNT(*)',
+ array( 'job_cmd' => $this->type, 'job_token' => '' ),
+ __METHOD__
+ );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
+ }
$this->cache->set( $key, $size, self::CACHE_TTL_SHORT );
return $size;
}
list( $dbr, $scope ) = $this->getSlaveDB();
- $count = (int)$dbr->selectField( 'job', 'COUNT(*)',
- array( 'job_cmd' => $this->type, "job_token != {$dbr->addQuotes( '' )}" ),
- __METHOD__
- );
+ try {
+ $count = (int)$dbr->selectField( 'job', 'COUNT(*)',
+ array( 'job_cmd' => $this->type, "job_token != {$dbr->addQuotes( '' )}" ),
+ __METHOD__
+ );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
+ }
$this->cache->set( $key, $count, self::CACHE_TTL_SHORT );
return $count;
}
list( $dbr, $scope ) = $this->getSlaveDB();
- $count = (int)$dbr->selectField( 'job', 'COUNT(*)',
- array(
- 'job_cmd' => $this->type,
- "job_token != {$dbr->addQuotes( '' )}",
- "job_attempts >= " . $dbr->addQuotes( $this->maxTries )
- ),
- __METHOD__
- );
+ try {
+ $count = (int)$dbr->selectField( 'job', 'COUNT(*)',
+ array(
+ 'job_cmd' => $this->type,
+ "job_token != {$dbr->addQuotes( '' )}",
+ "job_attempts >= " . $dbr->addQuotes( $this->maxTries )
+ ),
+ __METHOD__
+ );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
+ }
$wgMemc->set( $key, $count, self::CACHE_TTL_SHORT );
return $count;
}
list( $dbw, $scope ) = $this->getMasterDB();
- $dbw->commit( __METHOD__, 'flush' ); // flush existing transaction
- $autoTrx = $dbw->getFlag( DBO_TRX ); // get current setting
- $dbw->clearFlag( DBO_TRX ); // make each query its own transaction
- $scopedReset = new ScopedCallback( function() use ( $dbw, $autoTrx ) {
- $dbw->setFlag( $autoTrx ? DBO_TRX : 0 ); // restore old setting
- } );
-
- $uuid = wfRandomString( 32 ); // pop attempt
- $job = false; // job popped off
- do { // retry when our row is invalid or deleted as a duplicate
- // Try to reserve a row in the DB...
- if ( in_array( $this->order, array( 'fifo', 'timestamp' ) ) ) {
- $row = $this->claimOldest( $uuid );
- } else { // random first
- $rand = mt_rand( 0, self::MAX_JOB_RANDOM ); // encourage concurrent UPDATEs
- $gte = (bool)mt_rand( 0, 1 ); // find rows with rand before/after $rand
- $row = $this->claimRandom( $uuid, $rand, $gte );
- }
- // Check if we found a row to reserve...
- if ( !$row ) {
- $this->cache->set( $this->getCacheKey( 'empty' ), 'true', self::CACHE_TTL_LONG );
- break; // nothing to do
- }
- JobQueue::incrStats( 'job-pop', $this->type );
- // Get the job object from the row...
- $title = Title::makeTitleSafe( $row->job_namespace, $row->job_title );
- if ( !$title ) {
- $dbw->delete( 'job', array( 'job_id' => $row->job_id ), __METHOD__ );
- wfDebug( "Row has invalid title '{$row->job_title}'." );
- continue; // try again
- }
- $job = Job::factory( $row->job_cmd, $title,
- self::extractBlob( $row->job_params ), $row->job_id );
- $job->metadata['id'] = $row->job_id;
- $job->id = $row->job_id; // XXX: work around broken subclasses
- break; // done
- } while ( true );
+ try {
+ $dbw->commit( __METHOD__, 'flush' ); // flush existing transaction
+ $autoTrx = $dbw->getFlag( DBO_TRX ); // get current setting
+ $dbw->clearFlag( DBO_TRX ); // make each query its own transaction
+ $scopedReset = new ScopedCallback( function() use ( $dbw, $autoTrx ) {
+ $dbw->setFlag( $autoTrx ? DBO_TRX : 0 ); // restore old setting
+ } );
+
+ $uuid = wfRandomString( 32 ); // pop attempt
+ $job = false; // job popped off
+ do { // retry when our row is invalid or deleted as a duplicate
+ // Try to reserve a row in the DB...
+ if ( in_array( $this->order, array( 'fifo', 'timestamp' ) ) ) {
+ $row = $this->claimOldest( $uuid );
+ } else { // random first
+ $rand = mt_rand( 0, self::MAX_JOB_RANDOM ); // encourage concurrent UPDATEs
+ $gte = (bool)mt_rand( 0, 1 ); // find rows with rand before/after $rand
+ $row = $this->claimRandom( $uuid, $rand, $gte );
+ }
+ // Check if we found a row to reserve...
+ if ( !$row ) {
+ $this->cache->set( $this->getCacheKey( 'empty' ), 'true', self::CACHE_TTL_LONG );
+ break; // nothing to do
+ }
+ JobQueue::incrStats( 'job-pop', $this->type );
+ // Get the job object from the row...
+ $title = Title::makeTitleSafe( $row->job_namespace, $row->job_title );
+ if ( !$title ) {
+ $dbw->delete( 'job', array( 'job_id' => $row->job_id ), __METHOD__ );
+ wfDebug( "Row has invalid title '{$row->job_title}'." );
+ continue; // try again
+ }
+ $job = Job::factory( $row->job_cmd, $title,
+ self::extractBlob( $row->job_params ), $row->job_id );
+ $job->metadata['id'] = $row->job_id;
+ $job->id = $row->job_id; // XXX: work around broken subclasses
+ break; // done
+ } while ( true );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
+ }
return $job;
}
}
list( $dbw, $scope ) = $this->getMasterDB();
- $dbw->commit( __METHOD__, 'flush' ); // flush existing transaction
- $autoTrx = $dbw->getFlag( DBO_TRX ); // get current setting
- $dbw->clearFlag( DBO_TRX ); // make each query its own transaction
- $scopedReset = new ScopedCallback( function() use ( $dbw, $autoTrx ) {
- $dbw->setFlag( $autoTrx ? DBO_TRX : 0 ); // restore old setting
- } );
-
- // Delete a row with a single DELETE without holding row locks over RTTs...
- $dbw->delete( 'job',
- array( 'job_cmd' => $this->type, 'job_id' => $job->metadata['id'] ), __METHOD__ );
+ try {
+ $dbw->commit( __METHOD__, 'flush' ); // flush existing transaction
+ $autoTrx = $dbw->getFlag( DBO_TRX ); // get current setting
+ $dbw->clearFlag( DBO_TRX ); // make each query its own transaction
+ $scopedReset = new ScopedCallback( function() use ( $dbw, $autoTrx ) {
+ $dbw->setFlag( $autoTrx ? DBO_TRX : 0 ); // restore old setting
+ } );
+
+ // Delete a row with a single DELETE without holding row locks over RTTs...
+ $dbw->delete( 'job',
+ array( 'job_cmd' => $this->type, 'job_id' => $job->metadata['id'] ), __METHOD__ );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
+ }
return true;
}
protected function doDelete() {
list( $dbw, $scope ) = $this->getMasterDB();
- $dbw->delete( 'job', array( 'job_cmd' => $this->type ) );
+ try {
+ $dbw->delete( 'job', array( 'job_cmd' => $this->type ) );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
+ }
return true;
}
*/
public function getAllQueuedJobs() {
list( $dbr, $scope ) = $this->getSlaveDB();
- return new MappedIterator(
- $dbr->select( 'job', '*', array( 'job_cmd' => $this->getType(), 'job_token' => '' ) ),
- function( $row ) use ( $scope ) {
- $job = Job::factory(
- $row->job_cmd,
- Title::makeTitle( $row->job_namespace, $row->job_title ),
- strlen( $row->job_params ) ? unserialize( $row->job_params ) : false,
- $row->job_id
- );
- $job->metadata['id'] = $row->job_id;
- $job->id = $row->job_id; // XXX: work around broken subclasses
- return $job;
- }
- );
+ try {
+ return new MappedIterator(
+ $dbr->select( 'job', '*',
+ array( 'job_cmd' => $this->getType(), 'job_token' => '' ) ),
+ function( $row ) use ( $scope ) {
+ $job = Job::factory(
+ $row->job_cmd,
+ Title::makeTitle( $row->job_namespace, $row->job_title ),
+ strlen( $row->job_params ) ? unserialize( $row->job_params ) : false,
+ $row->job_id
+ );
+ $job->metadata['id'] = $row->job_id;
+ $job->id = $row->job_id; // XXX: work around broken subclasses
+ return $job;
+ }
+ );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
+ }
}
/**
*/
public function recycleAndDeleteStaleJobs() {
$now = time();
- list( $dbw, $scope ) = $this->getMasterDB();
$count = 0; // affected rows
+ list( $dbw, $scope ) = $this->getMasterDB();
- if ( !$dbw->lock( "jobqueue-recycle-{$this->type}", __METHOD__, 1 ) ) {
- return $count; // already in progress
- }
+ try {
+ if ( !$dbw->lock( "jobqueue-recycle-{$this->type}", __METHOD__, 1 ) ) {
+ return $count; // already in progress
+ }
- // Remove claims on jobs acquired for too long if enabled...
- if ( $this->claimTTL > 0 ) {
- $claimCutoff = $dbw->timestamp( $now - $this->claimTTL );
- // Get the IDs of jobs that have be claimed but not finished after too long.
- // These jobs can be recycled into the queue by expiring the claim. Selecting
- // the IDs first means that the UPDATE can be done by primary key (less deadlocks).
- $res = $dbw->select( 'job', 'job_id',
- array(
- 'job_cmd' => $this->type,
- "job_token != {$dbw->addQuotes( '' )}", // was acquired
- "job_token_timestamp < {$dbw->addQuotes( $claimCutoff )}", // stale
- "job_attempts < {$dbw->addQuotes( $this->maxTries )}" ), // retries left
- __METHOD__
+ // Remove claims on jobs acquired for too long if enabled...
+ if ( $this->claimTTL > 0 ) {
+ $claimCutoff = $dbw->timestamp( $now - $this->claimTTL );
+ // Get the IDs of jobs that have be claimed but not finished after too long.
+ // These jobs can be recycled into the queue by expiring the claim. Selecting
+ // the IDs first means that the UPDATE can be done by primary key (less deadlocks).
+ $res = $dbw->select( 'job', 'job_id',
+ array(
+ 'job_cmd' => $this->type,
+ "job_token != {$dbw->addQuotes( '' )}", // was acquired
+ "job_token_timestamp < {$dbw->addQuotes( $claimCutoff )}", // stale
+ "job_attempts < {$dbw->addQuotes( $this->maxTries )}" ), // retries left
+ __METHOD__
+ );
+ $ids = array_map(
+ function( $o ) {
+ return $o->job_id;
+ }, iterator_to_array( $res )
+ );
+ if ( count( $ids ) ) {
+ // Reset job_token for these jobs so that other runners will pick them up.
+ // Set the timestamp to the current time, as it is useful to now that the job
+ // was already tried before (the timestamp becomes the "released" time).
+ $dbw->update( 'job',
+ array(
+ 'job_token' => '',
+ 'job_token_timestamp' => $dbw->timestamp( $now ) ), // time of release
+ array(
+ 'job_id' => $ids ),
+ __METHOD__
+ );
+ $count += $dbw->affectedRows();
+ JobQueue::incrStats( 'job-recycle', $this->type, $dbw->affectedRows() );
+ $this->cache->set( $this->getCacheKey( 'empty' ), 'false', self::CACHE_TTL_LONG );
+ }
+ }
+
+ // Just destroy any stale jobs...
+ $pruneCutoff = $dbw->timestamp( $now - self::MAX_AGE_PRUNE );
+ $conds = array(
+ 'job_cmd' => $this->type,
+ "job_token != {$dbw->addQuotes( '' )}", // was acquired
+ "job_token_timestamp < {$dbw->addQuotes( $pruneCutoff )}" // stale
);
+ if ( $this->claimTTL > 0 ) { // only prune jobs attempted too many times...
+ $conds[] = "job_attempts >= {$dbw->addQuotes( $this->maxTries )}";
+ }
+ // Get the IDs of jobs that are considered stale and should be removed. Selecting
+ // the IDs first means that the UPDATE can be done by primary key (less deadlocks).
+ $res = $dbw->select( 'job', 'job_id', $conds, __METHOD__ );
$ids = array_map(
function( $o ) {
return $o->job_id;
}, iterator_to_array( $res )
);
if ( count( $ids ) ) {
- // Reset job_token for these jobs so that other runners will pick them up.
- // Set the timestamp to the current time, as it is useful to now that the job
- // was already tried before (the timestamp becomes the "released" time).
- $dbw->update( 'job',
- array(
- 'job_token' => '',
- 'job_token_timestamp' => $dbw->timestamp( $now ) ), // time of release
- array(
- 'job_id' => $ids ),
- __METHOD__
- );
+ $dbw->delete( 'job', array( 'job_id' => $ids ), __METHOD__ );
$count += $dbw->affectedRows();
- JobQueue::incrStats( 'job-recycle', $this->type, $dbw->affectedRows() );
- $this->cache->set( $this->getCacheKey( 'empty' ), 'false', self::CACHE_TTL_LONG );
+ JobQueue::incrStats( 'job-abandon', $this->type, $dbw->affectedRows() );
}
- }
- // Just destroy any stale jobs...
- $pruneCutoff = $dbw->timestamp( $now - self::MAX_AGE_PRUNE );
- $conds = array(
- 'job_cmd' => $this->type,
- "job_token != {$dbw->addQuotes( '' )}", // was acquired
- "job_token_timestamp < {$dbw->addQuotes( $pruneCutoff )}" // stale
- );
- if ( $this->claimTTL > 0 ) { // only prune jobs attempted too many times...
- $conds[] = "job_attempts >= {$dbw->addQuotes( $this->maxTries )}";
- }
- // Get the IDs of jobs that are considered stale and should be removed. Selecting
- // the IDs first means that the UPDATE can be done by primary key (less deadlocks).
- $res = $dbw->select( 'job', 'job_id', $conds, __METHOD__ );
- $ids = array_map(
- function( $o ) {
- return $o->job_id;
- }, iterator_to_array( $res )
- );
- if ( count( $ids ) ) {
- $dbw->delete( 'job', array( 'job_id' => $ids ), __METHOD__ );
- $count += $dbw->affectedRows();
- JobQueue::incrStats( 'job-abandon', $this->type, $dbw->affectedRows() );
+ $dbw->unlock( "jobqueue-recycle-{$this->type}", __METHOD__ );
+ } catch ( DBError $e ) {
+ $this->throwDBException( $e );
}
- $dbw->unlock( "jobqueue-recycle-{$this->type}", __METHOD__ );
-
return $count;
}
* @return Array (DatabaseBase, ScopedCallback)
*/
protected function getSlaveDB() {
- return $this->getDB( DB_SLAVE );
+ try {
+ return $this->getDB( DB_SLAVE );
+ } catch ( DBConnectionError $e ) {
+ throw new JobQueueConnectionError( "DBConnectionError:" . $e->getMessage() );
+ }
}
/**
* @return Array (DatabaseBase, ScopedCallback)
*/
protected function getMasterDB() {
- return $this->getDB( DB_MASTER );
+ try {
+ return $this->getDB( DB_MASTER );
+ } catch ( DBConnectionError $e ) {
+ throw new JobQueueConnectionError( "DBConnectionError:" . $e->getMessage() );
+ }
}
/**
return false;
}
}
+
+ /**
+ * @param DBError $e
+ * @throws JobQueueError
+ */
+ protected function throwDBException( DBError $e ) {
+ throw new JobQueueError( get_class( $e ) . ": " . $e->getMessage() );
+ }
}
dépôts / lhc / web / wiklou.git / commitdiff