protected function loadPage()
{
$table = new DrydockResource();
$conn_r = $table->establishConnection('r');
$data = queryfx_all($conn_r, 'SELECT resource.* FROM %T resource %Q %Q %Q', $table->getTableName(), $this->buildWhereClause($conn_r), $this->buildOrderClause($conn_r), $this->buildLimitClause($conn_r));
$resources = $table->loadAllFromArray($data);
return $resources;
}
/**
* Apply standard limits on resource allocation rate.
*
* @param DrydockBlueprint The blueprint requesting an allocation.
* @return bool True if further allocations should be limited.
*/
protected function shouldLimitAllocatingPoolSize(DrydockBlueprint $blueprint)
{
// TODO: If this mechanism sticks around, these values should be
// configurable by the blueprint implementation.
// Limit on total number of active resources.
$total_limit = $this->getConcurrentResourceLimit($blueprint);
// Always allow at least this many allocations to be in flight at once.
$min_allowed = 1;
// Allow this fraction of allocating resources as a fraction of active
// resources.
$growth_factor = 0.25;
$resource = new DrydockResource();
$conn_r = $resource->establishConnection('r');
$counts = queryfx_all($conn_r, 'SELECT status, COUNT(*) N FROM %T
WHERE blueprintPHID = %s AND status != %s
GROUP BY status', $resource->getTableName(), $blueprint->getPHID(), DrydockResourceStatus::STATUS_DESTROYED);
$counts = ipull($counts, 'N', 'status');
$n_alloc = idx($counts, DrydockResourceStatus::STATUS_PENDING, 0);
$n_active = idx($counts, DrydockResourceStatus::STATUS_ACTIVE, 0);
$n_broken = idx($counts, DrydockResourceStatus::STATUS_BROKEN, 0);
$n_released = idx($counts, DrydockResourceStatus::STATUS_RELEASED, 0);
// If we're at the limit on total active resources, limit additional
// allocations.
if ($total_limit !== null) {
$n_total = $n_alloc + $n_active + $n_broken + $n_released;
if ($n_total >= $total_limit) {
return true;
}
}
// If the number of in-flight allocations is fewer than the minimum number
// of allowed allocations, don't impose a limit.
if ($n_alloc < $min_allowed) {
return false;
}
$allowed_alloc = (int) ceil($n_active * $growth_factor);
// If the number of in-flight allocation is fewer than the number of
// allowed allocations according to the pool growth factor, don't impose
// a limit.
if ($n_alloc < $allowed_alloc) {
return false;
}
return true;
}
