| | | 1 | | using Hangfire; |
| | | 2 | | using Hangfire.Storage; |
| | | 3 | | using Microsoft.Extensions.Logging; |
| | | 4 | | using Services.HangfireService; |
| | | 5 | | |
| | | 6 | | namespace Services.SearchServices.OrderSearch; |
| | | 7 | | |
| | | 8 | | /// <summary> |
| | | 9 | | /// Общая распределённая блокировка для операций, временно меняющих состав индекса заказов. |
| | | 10 | | /// </summary> |
| | | 11 | | public interface IOrderSearchIndexOperationLock |
| | | 12 | | { |
| | | 13 | | /// <summary>Пытается получить блокировку; возвращает <see langword="null"/>, если она уже занята.</summary> |
| | | 14 | | IDisposable? TryAcquire(); |
| | | 15 | | } |
| | | 16 | | |
| | | 17 | | public sealed class OrderSearchIndexOperationLock : IOrderSearchIndexOperationLock |
| | | 18 | | { |
| | | 19 | | public const string LockKey = "order-search:index-operation"; |
| | | 20 | | |
| | 0 | 21 | | private static readonly TimeSpan LockTimeout = TimeSpan.FromMilliseconds(1); |
| | | 22 | | private readonly ILogger<OrderSearchIndexOperationLock> _logger; |
| | | 23 | | |
| | 0 | 24 | | public OrderSearchIndexOperationLock(ILogger<OrderSearchIndexOperationLock> logger) |
| | | 25 | | { |
| | 0 | 26 | | _logger = logger; |
| | 0 | 27 | | } |
| | | 28 | | |
| | | 29 | | public IDisposable? TryAcquire() |
| | | 30 | | { |
| | 0 | 31 | | IStorageConnection? connection = null; |
| | 0 | 32 | | IDisposable? distributedLock = null; |
| | | 33 | | |
| | | 34 | | try |
| | | 35 | | { |
| | 0 | 36 | | connection = JobStorage.Current.GetConnection(); |
| | 0 | 37 | | distributedLock = connection.AcquireDistributedLock(LockKey, LockTimeout); |
| | | 38 | | |
| | 0 | 39 | | var handle = new LockHandle(distributedLock, connection, _logger); |
| | 0 | 40 | | distributedLock = null; |
| | 0 | 41 | | connection = null; |
| | 0 | 42 | | return handle; |
| | | 43 | | } |
| | 0 | 44 | | catch (DistributedLockTimeoutException) |
| | | 45 | | { |
| | 0 | 46 | | return null; |
| | | 47 | | } |
| | | 48 | | finally |
| | | 49 | | { |
| | 0 | 50 | | HangfireDistributedLockHelper.SafeDispose(ref distributedLock, ref connection, _logger); |
| | 0 | 51 | | } |
| | 0 | 52 | | } |
| | | 53 | | |
| | | 54 | | private sealed class LockHandle : IDisposable |
| | | 55 | | { |
| | | 56 | | private readonly ILogger _logger; |
| | | 57 | | private IStorageConnection? _connection; |
| | | 58 | | private IDisposable? _distributedLock; |
| | | 59 | | |
| | 0 | 60 | | public LockHandle(IDisposable distributedLock, IStorageConnection connection, ILogger logger) |
| | | 61 | | { |
| | 0 | 62 | | _distributedLock = distributedLock; |
| | 0 | 63 | | _connection = connection; |
| | 0 | 64 | | _logger = logger; |
| | 0 | 65 | | } |
| | | 66 | | |
| | | 67 | | public void Dispose() => |
| | 0 | 68 | | HangfireDistributedLockHelper.SafeDispose(ref _distributedLock, ref _connection, _logger); |
| | | 69 | | } |
| | | 70 | | } |