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phorge-phorge/src/infrastructure/storage/lisk/LiskMigrationIterator.php
vrana ef85f49adc Delete license headers from files
Summary:
This commit doesn't change license of any file. It just makes the license implicit (inherited from LICENSE file in the root directory).

We are removing the headers for these reasons:

- It wastes space in editors, less code is visible in editor upon opening a file.
- It brings noise to diff of the first change of any file every year.
- It confuses Git file copy detection when creating small files.
- We don't have an explicit license header in other files (JS, CSS, images, documentation).
- Using license header in every file is not obligatory: http://www.apache.org/dev/apply-license.html#new.

This change is approved by Alma Chao (Lead Open Source and IP Counsel at Facebook).

Test Plan: Verified that the license survived only in LICENSE file and that it didn't modify externals.

Reviewers: epriestley, davidrecordon

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2035

Differential Revision: https://secure.phabricator.com/D3886
2012-11-05 11:16:51 -08:00

48 lines
1 KiB
PHP

<?php
/**
* Iterate over every object of a given type, without holding all of them in
* memory. This is useful for performing database migrations.
*
* $things = new LiskMigrationIterator(new LiskThing());
* foreach ($things as $thing) {
* // do something
* }
*
* NOTE: This only works on objects with a normal `id` column.
*
* @task storage
*/
final class LiskMigrationIterator extends PhutilBufferedIterator {
private $object;
private $cursor;
private $set;
public function __construct(LiskDAO $object) {
$this->set = new LiskDAOSet();
$this->object = $object->putInSet($this->set);
}
protected function didRewind() {
$this->cursor = 0;
}
public function key() {
return $this->current()->getID();
}
protected function loadPage() {
$this->set->clearSet();
$results = $this->object->loadAllWhere(
'id > %d ORDER BY id ASC LIMIT %d',
$this->cursor,
$this->getPageSize());
if ($results) {
$this->cursor = last($results)->getID();
}
return $results;
}
}