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phorge/src/applications/differential/query/revision/DifferentialRevisionQuery.php
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DifferentialRevisionQuery.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Flexible query API for Differential revisions. Example:
*
* // Load open revisions
* $revisions = id(new DifferentialRevisionQuery())
* ->withStatus(DifferentialRevisionQuery::STATUS_OPEN)
* ->execute();
*
* @task config Query Configuration
* @task exec Query Execution
* @task internal Internals
*/
final class DifferentialRevisionQuery {
// TODO: Replace DifferentialRevisionListData with this class.
private $pathIDs = array();
private $status = 'status-any';
const STATUS_ANY = 'status-any';
const STATUS_OPEN = 'status-open';
private $authors = array();
private $ccs = array();
private $reviewers = array();
private $revIDs = array();
private $phids = array();
private $subscribers = array();
private $responsibles = array();
private $order = 'order-modified';
const ORDER_MODIFIED = 'order-modified';
const ORDER_CREATED = 'order-created';
/**
* This is essentially a denormalized copy of the revision modified time that
* should perform better for path queries with a LIMIT. Critically, when you
* browse "/", every revision in that repository for all time will match so
* the query benefits from being able to stop before fully materializing the
* result set.
*/
const ORDER_PATH_MODIFIED = 'order-path-modified';
private $limit = 1000;
private $offset = 0;
private $needRelationships = false;
/* -( Query Configuration )------------------------------------------------ */
/**
* Filter results to revisions which affect a Diffusion path ID in a given
* repository. You can call this multiple times to select revisions for
* several paths.
*
* @param int Diffusion repository ID.
* @param int Diffusion path ID.
* @return this
* @task config
*/
public function withPath($repository_id, $path_id) {
$this->pathIDs[] = array(
'repositoryID' => $repository_id,
'pathID' => $path_id,
);
return $this;
}
/**
* Filter results to revisions authored by one of the given PHIDs.
*
* @param array List of PHIDs of authors
* @return this
* @task config
*/
public function withAuthors(array $author_phids) {
$this->authors = $author_phids;
return $this;
}
/**
* Filter results to revisions which CC one of the listed people. Calling this
* function will clear anything set by previous calls to @{method:withCCs}.
*
* @param array List of PHIDs of subscribers
* @return this
* @task config
*/
public function withCCs(array $cc_phids) {
$this->ccs = $cc_phids;
return $this;
}
/**
* Filter results to revisions that have one of the provided PHIDs as
* reviewers. Calling this function will clear anything set by previous calls
* to @{method:withReviewers}.
*
* @param array List of PHIDs of reviewers
* @return this
* @task config
*/
public function withReviewers(array $reviewer_phids) {
$this->reviewers = $reviewer_phids;
return $this;
}
/**
* Filter results to revisions with a given status. Provide a class constant,
* such as ##DifferentialRevisionQuery::STATUS_OPEN##.
*
* @param const Class STATUS constant, like STATUS_OPEN.
* @return this
* @task config
*/
public function withStatus($status_constant) {
$this->status = $status_constant;
return $this;
}
/**
* Filter results to only return revisions whose ids are in the given set.
*
* @param array List of revision ids
* @return this
* @task config
*/
public function withIDs(array $ids) {
$this->revIDs = $ids;
return $this;
}
/**
* Filter results to only return revisions whose PHIDs are in the given set.
*
* @param array List of revision PHIDs
* @return this
* @task config
*/
public function withPHIDs(array $phids) {
$this->phids = $phids;
return $this;
}
/**
* Given a set of users, filter results to return only revisions they are
* responsible for (i.e., they are either authors or reviewers).
*
* @param array List of user PHIDs.
* @return this
* @task config
*/
public function withResponsibleUsers(array $responsible_phids) {
$this->responsibles = $responsible_phids;
return $this;
}
/**
* Filter results to only return revisions with a given set of subscribers
* (i.e., they are authors, reviewers or CC'd).
*
* @param array List of user PHIDs.
* @return this
* @task config
*/
public function withSubscribers(array $subscriber_phids) {
$this->subscribers = $subscriber_phids;
return $this;
}
/**
* Set result ordering. Provide a class constant, such as
* ##DifferentialRevisionQuery::ORDER_CREATED##.
*
* @task config
*/
public function setOrder($order_constant) {
$this->order = $order_constant;
return $this;
}
/**
* Set result limit. If unspecified, defaults to 1000.
*
* @param int Result limit.
* @return this
* @task config
*/
public function setLimit($limit) {
$this->limit = $limit;
return $this;
}
/**
* Set result offset. If unspecified, defaults to 0.
*
* @param int Result offset.
* @return this
* @task config
*/
public function setOffset($offset) {
$this->offset = $offset;
return $this;
}
/**
* Set whether or not the query will load and attach relationships.
*
* @param bool True to load and attach relationships.
* @return this
* @task config
*/
public function needRelationships($need_relationships) {
$this->needRelationships = $need_relationships;
return $this;
}
/* -( Query Execution )---------------------------------------------------- */
/**
* Execute the query as configured, returning matching
* @{class:DifferentialRevision} objects.
*
* @return list List of matching DifferentialRevision objects.
* @task exec
*/
public function execute() {
$table = new DifferentialRevision();
$conn_r = $table->establishConnection('r');
if ($this->shouldUseResponsibleFastPath()) {
$data = $this->loadDataUsingResponsibleFastPath();
} else {
$data = $this->loadData();
}
$revisions = $table->loadAllFromArray($data);
if ($revisions && $this->needRelationships) {
$relationships = queryfx_all(
$conn_r,
'SELECT * FROM %T WHERE revisionID in (%Ld) ORDER BY sequence',
DifferentialRevision::RELATIONSHIP_TABLE,
mpull($revisions, 'getID'));
$relationships = igroup($relationships, 'revisionID');
foreach ($revisions as $revision) {
$revision->attachRelationships(
idx(
$relationships,
$revision->getID(),
array()));
}
}
return $revisions;
}
/**
* Determine if we should execute an optimized, fast-path query to fetch
* open revisions for one responsible user. This is used by the Differential
* dashboard and much faster when executed as a UNION ALL than with JOIN
* and WHERE, which is why we special case it.
*/
private function shouldUseResponsibleFastPath() {
if ((count($this->responsibles) == 1) &&
($this->status == self::STATUS_OPEN) &&
($this->order == self::ORDER_MODIFIED) &&
!$this->offset &&
!$this->limit &&
!$this->subscribers &&
!$this->reviewers &&
!$this->ccs &&
!$this->authors &&
!$this->revIDs &&
!$this->phids) {
return true;
}
return false;
}
private function loadDataUsingResponsibleFastPath() {
$table = new DifferentialRevision();
$conn_r = $table->establishConnection('r');
$responsible_phid = reset($this->responsibles);
$open_statuses = array(
DifferentialRevisionStatus::NEEDS_REVIEW,
DifferentialRevisionStatus::NEEDS_REVISION,
DifferentialRevisionStatus::ACCEPTED,
);
return queryfx_all(
$conn_r,
'SELECT * FROM %T WHERE authorPHID = %s AND status IN (%Ld)
UNION ALL
SELECT r.* FROM %T r JOIN %T rel
ON rel.revisionID = r.id
AND rel.relation = %s
AND rel.objectPHID = %s
WHERE r.status IN (%Ld)',
$table->getTableName(),
$responsible_phid,
$open_statuses,
$table->getTableName(),
DifferentialRevision::RELATIONSHIP_TABLE,
DifferentialRevision::RELATION_REVIEWER,
$responsible_phid,
$open_statuses);
}
private function loadData() {
$table = new DifferentialRevision();
$conn_r = $table->establishConnection('r');
$select = qsprintf(
$conn_r,
'SELECT r.* FROM %T r',
$table->getTableName());
$joins = $this->buildJoinsClause($conn_r);
$where = $this->buildWhereClause($conn_r);
$group_by = $this->buildGroupByClause($conn_r);
$order_by = $this->buildOrderByClause($conn_r);
$limit = '';
if ($this->offset || $this->limit) {
$limit = qsprintf(
$conn_r,
'LIMIT %d, %d',
(int)$this->offset,
$this->limit);
}
return queryfx_all(
$conn_r,
'%Q %Q %Q %Q %Q %Q',
$select,
$joins,
$where,
$group_by,
$order_by,
$limit);
}
/* -( Internals )---------------------------------------------------------- */
/**
* @task internal
*/
private function buildJoinsClause($conn_r) {
$joins = array();
if ($this->pathIDs) {
$path_table = new DifferentialAffectedPath();
$joins[] = qsprintf(
$conn_r,
'JOIN %T p ON p.revisionID = r.id',
$path_table->getTableName());
}
if ($this->ccs) {
$joins[] = qsprintf(
$conn_r,
'JOIN %T cc_rel ON cc_rel.revisionID = r.id '.
'AND cc_rel.relation = %s '.
'AND cc_rel.objectPHID in (%Ls)',
DifferentialRevision::RELATIONSHIP_TABLE,
DifferentialRevision::RELATION_SUBSCRIBED,
$this->ccs);
}
if ($this->reviewers) {
$joins[] = qsprintf(
$conn_r,
'JOIN %T reviewer_rel ON reviewer_rel.revisionID = r.id '.
'AND reviewer_rel.relation = %s '.
'AND reviewer_rel.objectPHID in (%Ls)',
DifferentialRevision::RELATIONSHIP_TABLE,
DifferentialRevision::RELATION_REVIEWER,
$this->reviewers);
}
if ($this->subscribers) {
$joins[] = qsprintf(
$conn_r,
'JOIN %T sub_rel ON sub_rel.revisionID = r.id '.
'AND sub_rel.relation IN (%Ls) '.
'AND sub_rel.objectPHID in (%Ls)',
DifferentialRevision::RELATIONSHIP_TABLE,
array(
DifferentialRevision::RELATION_SUBSCRIBED,
DifferentialRevision::RELATION_REVIEWER,
),
$this->subscribers);
}
if ($this->responsibles) {
$joins[] = qsprintf(
$conn_r,
'LEFT JOIN %T responsibles_rel ON responsibles_rel.revisionID = r.id '.
'AND responsibles_rel.relation = %s '.
'AND responsibles_rel.objectPHID in (%Ls)',
DifferentialRevision::RELATIONSHIP_TABLE,
DifferentialRevision::RELATION_REVIEWER,
$this->responsibles);
}
$joins = implode(' ', $joins);
return $joins;
}
/**
* @task internal
*/
private function buildWhereClause($conn_r) {
$where = array();
if ($this->pathIDs) {
$path_clauses = array();
$repo_info = igroup($this->pathIDs, 'repositoryID');
foreach ($repo_info as $repository_id => $paths) {
$path_clauses[] = qsprintf(
$conn_r,
'(repositoryID = %d AND pathID IN (%Ld))',
$repository_id,
ipull($paths, 'pathID'));
}
$path_clauses = '('.implode(' OR ', $path_clauses).')';
$where[] = $path_clauses;
}
if ($this->authors) {
$where[] = qsprintf(
$conn_r,
'authorPHID IN (%Ls)',
$this->authors);
}
if ($this->revIDs) {
$where[] = qsprintf(
$conn_r,
'id IN (%Ld)',
$this->revIDs);
}
if ($this->phids) {
$where[] = qsprintf(
$conn_r,
'phid IN (%Ls)',
$this->phids);
}
if ($this->responsibles) {
$where[] = qsprintf(
$conn_r,
'(responsibles_rel.objectPHID IS NOT NULL OR r.authorPHID IN (%Ls))',
$this->responsibles);
}
switch ($this->status) {
case self::STATUS_ANY:
break;
case self::STATUS_OPEN:
$where[] = qsprintf(
$conn_r,
'status IN (%Ld)',
array(
DifferentialRevisionStatus::NEEDS_REVIEW,
DifferentialRevisionStatus::NEEDS_REVISION,
DifferentialRevisionStatus::ACCEPTED,
));
break;
default:
throw new Exception(
"Unknown revision status filter constant '{$this->status}'!");
}
if ($where) {
$where = 'WHERE '.implode(' AND ', $where);
} else {
$where = '';
}
return $where;
}
/**
* @task internal
*/
private function buildGroupByClause($conn_r) {
$join_triggers = array_merge(
$this->pathIDs,
$this->ccs,
$this->reviewers,
$this->subscribers,
$this->responsibles);
$needs_distinct = (count($join_triggers) > 1);
if ($needs_distinct) {
return 'GROUP BY r.id';
} else {
return '';
}
}
/**
* @task internal
*/
private function buildOrderByClause($conn_r) {
switch ($this->order) {
case self::ORDER_MODIFIED:
return 'ORDER BY r.dateModified DESC';
case self::ORDER_CREATED:
return 'ORDER BY r.dateCreated DESC';
case self::ORDER_PATH_MODIFIED:
if (!$this->pathIDs) {
throw new Exception(
"To use ORDER_PATH_MODIFIED, you must specify withPath().");
}
return 'ORDER BY p.epoch DESC';
default:
throw new Exception("Unknown query order constant '{$this->order}'.");
}
}
}

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