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phorge/src/applications/phid/handle/pool/PhabricatorHandlePool.php
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PhabricatorHandlePool.php
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<?php
/**
* Coordinates loading object handles.
*
* This is a low-level piece of plumbing which code will not normally interact
* with directly. For discussion of the handle pool mechanism, see
* @{class:PhabricatorHandleList}.
*/
final class PhabricatorHandlePool extends Phobject {
private $viewer;
private $handles = array();
private $unloadedPHIDs = array();
public function setViewer(PhabricatorUser $user) {
$this->viewer = $user;
return $this;
}
public function getViewer() {
return $this->viewer;
}
public function newHandleList(array $phids) {
// Mark any PHIDs we haven't loaded yet as unloaded. This will let us bulk
// load them later.
foreach ($phids as $phid) {
if (empty($this->handles[$phid])) {
$this->unloadedPHIDs[$phid] = true;
}
}
$unique = array();
foreach ($phids as $phid) {
$unique[$phid] = $phid;
}
return id(new PhabricatorHandleList())
->setHandlePool($this)
->setPHIDs(array_values($unique));
}
public function loadPHIDs(array $phids) {
$need = array();
foreach ($phids as $phid) {
if (empty($this->handles[$phid])) {
$need[$phid] = true;
}
}
foreach ($need as $phid => $ignored) {
if (empty($this->unloadedPHIDs[$phid])) {
throw new Exception(
pht(
'Attempting to load PHID "%s", but it was not requested by any '.
'handle list.',
$phid));
}
}
// If we need any handles, bulk load everything in the queue.
if ($need) {
// Clear the list of PHIDs that need to be loaded before performing the
// actual fetch. This prevents us from looping if we need to reenter the
// HandlePool while loading handles.
$fetch_phids = array_keys($this->unloadedPHIDs);
$this->unloadedPHIDs = array();
$handles = id(new PhabricatorHandleQuery())
->setViewer($this->getViewer())
->withPHIDs($fetch_phids)
->execute();
$this->handles += $handles;
}
return array_select_keys($this->handles, $phids);
}
}

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