function capacity()
{
try {
$childData = $this->zookeeper->getChildren($this->path);
return count($childData->children);
} catch (Scalr_Service_Zookeeper_Exception $e) {
if ($e->getCode() == Scalr_Service_Zookeeper_Exception::NOT_FOUND) {
return 0;
}
throw $e;
}
}
function initiate($quorum = null)
{
if ($quorum != null) {
$this->originalQuorum = $this->quorum;
$this->quorum = $quorum;
}
try {
$this->zookeeper->create($this->path);
} catch (Scalr_Service_Zookeeper_Exception $ignore) {
}
if (!$this->lock->tryAcquire()) {
throw new Scalr_Service_Zookeeper_InterruptedException("Cannot get exclusive lock on election node. " . "Another election is already initiated");
}
try {
// Delete previous votes
$childInfo = $this->zookeeper->getChildren($this->path);
if ($childInfo->children) {
foreach ($childInfo->children as $childName) {
if (strpos($childName, "n") === 0) {
$this->zookeeper->delete("{$this->path}/{$childName}");
}
}
}
$this->isInitiator = true;
$this->setStatus(self::STATUS_READY);
if ($this->timeout) {
$this->timeout->reset();
}
$this->logger->info(sprintf("Election initiated (quorum: %d, path: %s)", $this->quorum, $this->path));
} catch (Exception $e) {
// Finally release lock
$this->lock->release();
throw $e;
}
}
function peek()
{
$this->init();
do {
// Fetch path child nodes
if (!$this->children) {
//$this->logger->debug("Getting queue path child nodes");
if ($this->blocking) {
$start = microtime(true);
try {
do {
$childData = $this->zookeeper->getChildren($this->path);
$loop = !$childData->children && ($this->blockingTimeout && !Scalr_Util_Timeout::reached($this->blockingTimeout, $start) || !$this->blockingTimeout);
} while ($loop);
} catch (Scalr_Util_TimeoutException $e) {
return null;
}
} else {
$childData = $this->zookeeper->getChildren($this->path);
}
if ($childData->children) {
sort($childData->children);
$this->children = $childData->children;
} else {
$this->logger->debug("Queue is empty");
if (!$this->blocking) {
return null;
}
}
}
$this->logger->debug("Children capacity: " . count($this->children));
while ($childName = array_shift($this->children)) {
try {
$statData = $this->zookeeper->get("{$this->path}/{$childName}");
$this->zookeeper->delete("{$this->path}/{$childName}");
$this->logger->info("Peeked {$this->path}/{$childName} from queue");
return base64_decode($statData->data64);
} catch (Exception $wasDeleted) {
// Continue loop
$this->logger->debug(sprintf("Got error while delete node %s. " . "I think it was processed by another client", "{$this->path}/{$childName}"));
}
}
} while (!$this->children);
}
private function itemNames()
{
$ret = array();
$childData = $this->zookeeper->getChildren($this->path);
if ($childData->children) {
foreach ($childData->children as $childName) {
if ($this->matchElementName($childName)) {
$ret[] = $childName;
}
}
}
return $ret;
}