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Directory >> /var/www/html/back/vendor/react/dns/src/Query/

File / Folder	Size	Action
.	-
CachingExecutor.php	2.672KB	edt ren
CancellationException.php	0.097KB	edt ren
CoopExecutor.php	3.352KB	edt ren
ExecutorInterface.php	1.427KB	edt ren
FallbackExecutor.php	1.679KB	edt ren
HostsFileExecutor.php	2.979KB	edt ren
Query.php	1.953KB	edt ren
RetryExecutor.php	2.763KB	edt ren
SelectiveTransportExecu...	3.048KB	edt ren
TcpTransportExecutor.php	13.635KB	edt ren
TimeoutException.php	0.085KB	edt ren
TimeoutExecutor.php	2.694KB	edt ren
UdpTransportExecutor.php	8.344KB	edt ren

<?php

namespace React\Dns\Query;

use React\Promise\Promise;

/**
 * Cooperatively resolves hosts via the given base executor to ensure same query is not run concurrently
 *
 * Wraps an existing `ExecutorInterface` to keep tracking of pending queries
 * and only starts a new query when the same query is not already pending. Once
 * the underlying query is fulfilled/rejected, it will forward its value to all
 * promises awaiting the same query.
 *
 * This means it will not limit concurrency for queries that differ, for example
 * when sending many queries for different host names or types.
 *
 * This is useful because all executors are entirely async and as such allow you
 * to execute any number of queries concurrently. You should probably limit the
 * number of concurrent queries in your application or you're very likely going
 * to face rate limitations and bans on the resolver end. For many common
 * applications, you may want to avoid sending the same query multiple times
 * when the first one is still pending, so you will likely want to use this in
 * combination with some other executor like this:
 *
 * ```php
 * $executor = new CoopExecutor(
 *     new RetryExecutor(
 *         new TimeoutExecutor(
 *             new UdpTransportExecutor($nameserver),
 *             3.0
 *         )
 *     )
 * );
 * ```
 */
final class CoopExecutor implements ExecutorInterface
{
    private $executor;
    private $pending = array();
    private $counts = array();

public function __construct(ExecutorInterface $base)
    {
        $this->executor = $base;
    }

public function query(Query $query)
    {
        $key = $this->serializeQueryToIdentity($query);
        if (isset($this->pending[$key])) {
            // same query is already pending, so use shared reference to pending query
            $promise = $this->pending[$key];
            ++$this->counts[$key];
        } else {
            // no such query pending, so start new query and keep reference until it's fulfilled or rejected
            $promise = $this->executor->query($query);
            $this->pending[$key] = $promise;
            $this->counts[$key] = 1;

$pending =& $this->pending;
            $counts =& $this->counts;
            $promise->then(function () use ($key, &$pending, &$counts) {
                unset($pending[$key], $counts[$key]);
            }, function () use ($key, &$pending, &$counts) {
                unset($pending[$key], $counts[$key]);
            });
        }

// Return a child promise awaiting the pending query.
        // Cancelling this child promise should only cancel the pending query
        // when no other child promise is awaiting the same query.
        $pending =& $this->pending;
        $counts =& $this->counts;
        return new Promise(function ($resolve, $reject) use ($promise) {
            $promise->then($resolve, $reject);
        }, function () use (&$promise, $key, $query, &$pending, &$counts) {
            if (--$counts[$key] < 1) {
                unset($pending[$key], $counts[$key]);
                $promise->cancel();
                $promise = null;
            }
            throw new \RuntimeException('DNS query for ' . $query->describe() . ' has been cancelled');
        });
    }

private function serializeQueryToIdentity(Query $query)
    {
        return sprintf('%s:%s:%s', $query->name, $query->type, $query->class);
    }
}