File Server/Exception/SubscriptionLimitReachedException.php

1:	<?php
2:
3:	declare(strict_types=1);
4:
5:	/**
6:	* This file is part of the Nexus MCP SDK package.
7:	*
8:	* (c) 2026 John Paul E. Balandan, CPA <paulbalandan@gmail.com>
9:	*
10:	* For the full copyright and license information, please view
11:	* the LICENSE file that was distributed with this source code.
12:	*/
13:
14:	namespace Nexus\Mcp\Server\Exception;
15:
16:	use Nexus\Mcp\Core\Exception\AbstractJsonRpcProtocolException;
17:	use Nexus\Mcp\Core\Schema\Enum\ProtocolErrorCode;
18:	use Nexus\Mcp\Core\Schema\RequestId;
19:
20:	/**
21:	* Thrown when a `subscriptions/listen` arrives while the store already holds its maximum open streams.
22:	*/
23:	final class SubscriptionLimitReachedException extends AbstractJsonRpcProtocolException
24:	{
25:	public function __construct(
26:	public readonly int $limit,
27:	?RequestId $requestId = null,
28:	?\Throwable $previous = null,
29:	) {
30:	parent::__construct(
31:	$requestId,
32:	\sprintf('Subscription limit reached: this server holds at most %d open streams.', $limit),
33:	$previous,
34:	errorData: ['limit' => $limit],
35:	);
36:	}
37:
38:	#[\Override]
39:	public static function getErrorCode(): ProtocolErrorCode
40:	{
41:	return ProtocolErrorCode::InternalError;
42:	}
43:	}
44: