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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * SPDX-License-Identifier: EUPL-1.2 |
| 5 | * |
| 6 | * This file is part of icap-flow. |
| 7 | * |
| 8 | * Licensed under the EUPL, Version 1.2 only (the "Licence"); |
| 9 | * you may not use this work except in compliance with the Licence. |
| 10 | * You may obtain a copy of the Licence at: |
| 11 | * |
| 12 | * https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the Licence is distributed on an "AS IS" basis, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | */ |
| 18 | |
| 19 | declare(strict_types=1); |
| 20 | |
| 21 | namespace Ndrstmr\Icap\Transport; |
| 22 | |
| 23 | use Amp\DeferredFuture; |
| 24 | use Amp\Socket\Socket; |
| 25 | |
| 26 | /** |
| 27 | * A call to {@see AmpConnectionPool::acquire()} that waits for room. The pool hands it what it was waiting for |
| 28 | * ({@see $grant}: an idle socket, already marked as in use, or the room to connect) and wakes it; the call |
| 29 | * itself also wakes when its wait runs out, when its caller cancels and when the pool is closed, and then finds |
| 30 | * out which of the four it was. |
| 31 | * |
| 32 | * The wait ends at {@see $deadline}, a point on the pool's monotonic clock, whether or not the timer that wakes |
| 33 | * the call has run: an event loop that something held up lets a deadline pass unnoticed, and what is granted |
| 34 | * after it is not for this call. |
| 35 | * |
| 36 | * @internal |
| 37 | */ |
| 38 | final class PoolWaiter |
| 39 | { |
| 40 | public Socket|PoolSlot|null $grant = null; |
| 41 | |
| 42 | /** @var DeferredFuture<null> */ |
| 43 | private DeferredFuture $woken; |
| 44 | |
| 45 | public function __construct( |
| 46 | public readonly string $endpoint, |
| 47 | public readonly string $bucket, |
| 48 | public readonly float $deadline, |
| 49 | ) { |
| 50 | $this->woken = new DeferredFuture(); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Wakes the call, once: a second reason to wake it changes nothing. |
| 55 | */ |
| 56 | public function wake(): void |
| 57 | { |
| 58 | if (!$this->woken->isComplete()) { |
| 59 | $this->woken->complete(); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | public function await(): void |
| 64 | { |
| 65 | $this->woken->getFuture()->await(); |
| 66 | } |
| 67 | } |