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QueryFuture.php
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Fri, Nov 22, 09:56

QueryFuture.php
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<?php
/**
* This class provides several approaches for querying data from the database:
*
* # Async queries: Used under MySQLi with MySQLnd.
* # Parallel queries: Used under HPHP.
* # Multi queries: Used under MySQLi or HPHP.
* # Single queries: Used under MySQL.
*
* The class automatically decides which approach to use. Usage is like with
* other futures:
*
* $futures = array();
* $futures[] = new QueryFuture($conn1, 'SELECT 1');
* $futures[] = new QueryFuture($conn1, 'DELETE FROM table');
* $futures[] = new QueryFuture($conn2, 'SELECT 2');
*
* foreach (new FutureIterator($futures) as $future) {
* try {
* $result = $future->resolve();
* } catch (AphrontQueryException $ex) {
* }
* }
*
* `$result` contains a list of dicts for select queries or number of modified
* rows for modification queries.
*/
final class QueryFuture extends Future {
private static $futures = array();
private $conn;
private $query;
private $id;
private $async;
private $profilerCallID;
public function __construct(
AphrontDatabaseConnection $conn,
$pattern/* , ... */) {
$this->conn = $conn;
$args = func_get_args();
$args = array_slice($args, 2);
$this->query = vqsprintf($conn, $pattern, $args);
self::$futures[] = $this;
$this->id = last_key(self::$futures);
}
public function isReady() {
if ($this->result !== null || $this->exception) {
return true;
}
if (!$this->conn->supportsAsyncQueries()) {
if ($this->conn->supportsParallelQueries()) {
$queries = array();
$conns = array();
foreach (self::$futures as $id => $future) {
$queries[$id] = $future->query;
$conns[$id] = $future->conn;
}
$results = $this->conn->executeParallelQueries($queries, $conns);
$this->processResults($results);
return true;
}
$conns = array();
$conn_queries = array();
foreach (self::$futures as $id => $future) {
$hash = spl_object_hash($future->conn);
$conns[$hash] = $future->conn;
$conn_queries[$hash][$id] = $future->query;
}
foreach ($conn_queries as $hash => $queries) {
$this->processResults($conns[$hash]->executeRawQueries($queries));
}
return true;
}
if (!$this->async) {
$profiler = PhutilServiceProfiler::getInstance();
$this->profilerCallID = $profiler->beginServiceCall(
array(
'type' => 'query',
'query' => $this->query,
'async' => true,
));
$this->async = $this->conn->asyncQuery($this->query);
return false;
}
$conns = array();
$asyncs = array();
foreach (self::$futures as $id => $future) {
if ($future->async) {
$conns[$id] = $future->conn;
$asyncs[$id] = $future->async;
}
}
$this->processResults($this->conn->resolveAsyncQueries($conns, $asyncs));
if ($this->result !== null || $this->exception) {
return true;
}
return false;
}
private function processResults(array $results) {
foreach ($results as $id => $result) {
$future = self::$futures[$id];
if ($result instanceof Exception) {
$future->exception = $result;
} else {
$future->result = $result;
}
unset(self::$futures[$id]);
if ($future->profilerCallID) {
$profiler = PhutilServiceProfiler::getInstance();
$profiler->endServiceCall($future->profilerCallID, array());
}
}
}
}

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