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diff --git a/src/applications/maniphest/editor/ManiphestTransactionEditor.php b/src/applications/maniphest/editor/ManiphestTransactionEditor.php
--- a/src/applications/maniphest/editor/ManiphestTransactionEditor.php
+++ b/src/applications/maniphest/editor/ManiphestTransactionEditor.php
@@ -384,8 +384,7 @@
*/
public static function getAdjacentSubpriority(
ManiphestTask $dst,
- $is_after,
- $allow_recursion = true) {
+ $is_after) {
$query = id(new ManiphestTaskQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
@@ -407,76 +406,25 @@
// If we find an adjacent task, we average the two subpriorities and
// return the result.
if ($adjacent) {
- $epsilon = 0.01;
+ $epsilon = 1.0;
// If the adjacent task has a subpriority that is identical or very
- // close to the task we're looking at, we're going to move it and all
- // tasks with the same subpriority a little farther down the subpriority
- // scale.
- if ($allow_recursion &&
- (abs($adjacent->getSubpriority() - $base) < $epsilon)) {
- $conn_w = $adjacent->establishConnection('w');
-
- $min = ($adjacent->getSubpriority() - ($epsilon));
- $max = ($adjacent->getSubpriority() + ($epsilon));
-
- // Get all of the tasks with the similar subpriorities to the adjacent
- // task, including the adjacent task itself.
- $query = id(new ManiphestTaskQuery())
- ->setViewer(PhabricatorUser::getOmnipotentUser())
- ->withPriorities(array($adjacent->getPriority()))
- ->withSubpriorityBetween($min, $max);
-
- if (!$is_after) {
- $query->setOrderVector(array('-priority', '-subpriority', '-id'));
+ // close to the task we're looking at, we're going to spread out all
+ // the nearby tasks.
+
+ $adjacent_sub = $adjacent->getSubpriority();
+ if ((abs($adjacent_sub - $base) < $epsilon)) {
+ $base = self::disperseBlock(
+ $dst,
+ $epsilon * 2);
+ if ($is_after) {
+ $sub = $base - $epsilon;
} else {
- $query->setOrderVector(array('priority', 'subpriority', 'id'));
- }
-
- $shift_all = $query->execute();
- $shift_last = last($shift_all);
-
- // Select the most extreme subpriority in the result set as the
- // base value.
- $shift_base = head($shift_all)->getSubpriority();
-
- // Find the subpriority before or after the task at the end of the
- // block.
- list($shift_pri, $shift_sub) = self::getAdjacentSubpriority(
- $shift_last,
- $is_after,
- $allow_recursion = false);
-
- $delta = ($shift_sub - $shift_base);
- $count = count($shift_all);
-
- $shift = array();
- $cursor = 1;
- foreach ($shift_all as $shift_task) {
- $shift_target = $shift_base + (($cursor / $count) * $delta);
- $cursor++;
-
- queryfx(
- $conn_w,
- 'UPDATE %T SET subpriority = %f WHERE id = %d',
- $adjacent->getTableName(),
- $shift_target,
- $shift_task->getID());
-
- // If we're shifting the adjacent task, update it.
- if ($shift_task->getID() == $adjacent->getID()) {
- $adjacent->setSubpriority($shift_target);
- }
-
- // If we're shifting the original target task, update the base
- // subpriority.
- if ($shift_task->getID() == $dst->getID()) {
- $base = $shift_target;
- }
+ $sub = $base + $epsilon;
}
+ } else {
+ $sub = ($adjacent_sub + $base) / 2;
}
-
- $sub = ($adjacent->getSubpriority() + $base) / 2;
} else {
// Otherwise, we take a step away from the target's subpriority and
// use that.
@@ -490,6 +438,156 @@
return array($dst->getPriority(), $sub);
}
+ /**
+ * Distribute a cluster of tasks with similar subpriorities.
+ */
+ private static function disperseBlock(
+ ManiphestTask $task,
+ $spacing) {
+
+ $conn = $task->establishConnection('w');
+
+ // Find a block of subpriority space which is, on average, sparse enough
+ // to hold all the tasks that are inside it with a reasonable level of
+ // separation between them.
+
+ // We'll start by looking near the target task for a range of numbers
+ // which has more space available than tasks. For example, if the target
+ // task has subpriority 33 and we want to separate each task by at least 1,
+ // we might start by looking in the range [23, 43].
+
+ // If we find fewer than 20 tasks there, we have room to reassign them
+ // with the desired level of separation. We space them out, then we're
+ // done.
+
+ // However: if we find more than 20 tasks, we don't have enough room to
+ // distribute them. We'll widen our search and look in a bigger range,
+ // maybe [13, 53]. This range has more space, so if we find fewer than
+ // 40 tasks in this range we can spread them out. If we still find too
+ // many tasks, we keep widening the search.
+
+ $base = $task->getSubpriority();
+
+ $scale = 4.0;
+ while (true) {
+ $range = ($spacing * $scale) / 2.0;
+ $min = ($base - $range);
+ $max = ($base + $range);
+
+ $result = queryfx_one(
+ $conn,
+ 'SELECT COUNT(*) N FROM %T WHERE priority = %d AND
+ subpriority BETWEEN %f AND %f',
+ $task->getTableName(),
+ $task->getPriority(),
+ $min,
+ $max);
+
+ $count = $result['N'];
+ if ($count < $scale) {
+ // We have found a block which we can make sparse enough, so bail and
+ // continue below with our selection.
+ break;
+ }
+
+ // This block had too many tasks for its size, so try again with a
+ // bigger block.
+ $scale *= 2.0;
+ }
+
+ $rows = queryfx_all(
+ $conn,
+ 'SELECT id FROM %T WHERE priority = %d AND
+ subpriority BETWEEN %f AND %f
+ ORDER BY priority, subpriority, id',
+ $task->getTableName(),
+ $task->getPriority(),
+ $min,
+ $max);
+
+ $task_id = $task->getID();
+ $result = null;
+
+ // NOTE: In strict mode (which we encourage enabling) we can't structure
+ // this bulk update as an "INSERT ... ON DUPLICATE KEY UPDATE" unless we
+ // provide default values for ALL of the columns that don't have defaults.
+
+ // This is gross, but we may be moving enough rows that individual
+ // queries are unreasonably slow. An alternate construction which might
+ // be worth evaluating is to use "CASE". Another approach is to disable
+ // strict mode for this query.
+
+ $extra_columns = array(
+ 'phid' => '""',
+ 'authorPHID' => '""',
+ 'status' => '""',
+ 'priority' => 0,
+ 'title' => '""',
+ 'originalTitle' => '""',
+ 'description' => '""',
+ 'dateCreated' => 0,
+ 'dateModified' => 0,
+ 'mailKey' => '""',
+ 'viewPolicy' => '""',
+ 'editPolicy' => '""',
+ 'ownerOrdering' => '""',
+ 'spacePHID' => '""',
+ 'bridgedObjectPHID' => '""',
+ 'properties' => '""',
+ 'points' => 0,
+ 'subtype' => '""',
+ );
+
+ $defaults = implode(', ', $extra_columns);
+
+ $sql = array();
+ $offset = 0;
+
+ // Often, we'll have more room than we need in the range. Distribute the
+ // tasks evenly over the whole range so that we're less likely to end up
+ // with tasks spaced exactly the minimum distance apart, which may
+ // get shifted again later. We have one fewer space to distribute than we
+ // have tasks.
+ $divisor = (double)(count($rows) - 1.0);
+ if ($divisor > 0) {
+ $available_distance = (($max - $min) / $divisor);
+ } else {
+ $available_distance = 0.0;
+ }
+
+ foreach ($rows as $row) {
+ $subpriority = $min + ($offset * $available_distance);
+
+ // If this is the task that we're spreading out relative to, keep track
+ // of where it is ending up so we can return the new subpriority.
+ $id = $row['id'];
+ if ($id == $task_id) {
+ $result = $subpriority;
+ }
+
+ $sql[] = qsprintf(
+ $conn,
+ '(%d, %Q, %f)',
+ $id,
+ $defaults,
+ $subpriority);
+
+ $offset++;
+ }
+
+ foreach (PhabricatorLiskDAO::chunkSQL($sql) as $chunk) {
+ queryfx(
+ $conn,
+ 'INSERT INTO %T (id, %Q, subpriority) VALUES %Q
+ ON DUPLICATE KEY UPDATE subpriority = VALUES(subpriority)',
+ $task->getTableName(),
+ implode(', ', array_keys($extra_columns)),
+ $chunk);
+ }
+
+ return $result;
+ }
+
protected function validateAllTransactions(
PhabricatorLiskDAO $object,
array $xactions) {
diff --git a/src/applications/project/controller/PhabricatorProjectMoveController.php b/src/applications/project/controller/PhabricatorProjectMoveController.php
--- a/src/applications/project/controller/PhabricatorProjectMoveController.php
+++ b/src/applications/project/controller/PhabricatorProjectMoveController.php
@@ -148,6 +148,9 @@
list($pri, $sub) = ManiphestTransactionEditor::getAdjacentSubpriority(
$task,
$is_after);
+
+ // If we find a priority on the first try, don't keep going.
+ break;
}
$xactions = array();

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