function enter($data = null)
{
// who will be first?
$iAmFirst = false;
try {
$this->zookeeper->create($this->path);
$iAmFirst = true;
} catch (Scalr_Service_Zookeeper_Exception $e) {
if ($e->getCode() != Scalr_Service_Zookeeper_Exception::CONFLICT) {
throw $e;
}
}
// create child node
$this->zookeeper->create("{$this->path}/n", $data ? serialize($data) : null, array(Scalr_Service_Zookeeper::OPT_SEQUENCE => true));
// wait while all nodes will enter barrier
try {
while ($this->timeout && !$this->timeout->reached() || !$this->timeout) {
if ($iAmFirst && $this->capacity() >= $this->quorum || !$iAmFirst && !$this->zookeeper->exists($this->path)) {
break;
} else {
Scalr_Util_Timeout::sleep(100);
}
}
} catch (Exception $e) {
// Finally delete barrier znode
if ($this->autoDelete) {
$this->delete();
}
throw $e;
}
if ($this->autoDelete) {
$this->delete();
}
}
function tryAcquire()
{
try {
$this->zookeeper->create($this->path);
return true;
} catch (Scalr_Service_Zookeeper_Exception $e) {
if ($e->getCode() == Scalr_Service_Zookeeper_Exception::CONFLICT) {
return false;
}
throw $e;
}
}
function add($item)
{
$this->init();
$this->lock->acquire();
try {
$ret = false;
if (!$this->contains0($item)) {
$ret = true;
$this->zookeeper->create("{$this->path}/element", "{$item}", array(Scalr_Service_Zookeeper::OPT_SEQUENCE => true));
}
$this->lock->release();
return $ret;
} catch (Exception $e) {
$this->lock->release();
throw $e;
}
}
private function setStatus($status)
{
if ($status != self::STATUS_NOTSET) {
try {
$this->zookeeper->set("{$this->path}/status", serialize($status));
} catch (Scalr_Service_Zookeeper_Exception $e) {
if ($e->getCode() == Scalr_Service_Zookeeper_Exception::NOT_FOUND) {
$this->zookeeper->create("{$this->path}/status", serialize($status));
return;
}
throw $e;
}
} else {
try {
$this->zookeeper->delete("{$this->path}/status");
} catch (Scalr_Service_Zookeeper_Exception $ignore) {
}
}
}
function put($data)
{
$this->init();
$pathData = $this->zookeeper->create("{$this->path}/element", $data, array("sequence" => true));
}
