| | | 1 | | // Copyright (c) Microsoft Corporation. All rights reserved. |
| | | 2 | | // Licensed under the MIT License. |
| | | 3 | | |
| | | 4 | | using System; |
| | | 5 | | using System.Collections.Generic; |
| | | 6 | | using System.Collections.Concurrent; |
| | | 7 | | using System.Threading; |
| | | 8 | | using System.Threading.Tasks; |
| | | 9 | | |
| | | 10 | | namespace Azure.Messaging.ServiceBus.Primitives |
| | | 11 | | { |
| | | 12 | | #pragma warning disable CA1001 // Types that own disposable fields should be disposable |
| | | 13 | | internal sealed class ConcurrentExpiringSet<TKey> |
| | | 14 | | #pragma warning restore CA1001 // Types that own disposable fields should be disposable |
| | | 15 | | { |
| | | 16 | | public readonly ConcurrentDictionary<TKey, DateTimeOffset> dictionary; |
| | | 17 | | |
| | | 18 | | public readonly ICollection<KeyValuePair<TKey, DateTimeOffset>> dictionaryAsCollection; |
| | | 19 | | |
| | 26 | 20 | | public readonly CancellationTokenSource tokenSource = new CancellationTokenSource(); |
| | | 21 | | |
| | 26 | 22 | | public volatile TaskCompletionSource<bool> cleanupTaskCompletionSource = new TaskCompletionSource<bool>(TaskCrea |
| | | 23 | | |
| | | 24 | | public int closeSignaled; |
| | | 25 | | |
| | | 26 | | public bool closed; |
| | | 27 | | |
| | 0 | 28 | | public static readonly TimeSpan delayBetweenCleanups = TimeSpan.FromSeconds(30); |
| | | 29 | | |
| | 26 | 30 | | public ConcurrentExpiringSet() |
| | | 31 | | { |
| | 26 | 32 | | dictionary = new ConcurrentDictionary<TKey, DateTimeOffset>(); |
| | 26 | 33 | | dictionaryAsCollection = dictionary; |
| | 26 | 34 | | _ = CollectExpiredEntriesAsync(tokenSource.Token); |
| | 26 | 35 | | } |
| | | 36 | | |
| | | 37 | | public void AddOrUpdate(TKey key, DateTimeOffset expiration) |
| | | 38 | | { |
| | 0 | 39 | | ThrowIfClosed(); |
| | | 40 | | |
| | 0 | 41 | | dictionary[key] = expiration; |
| | 0 | 42 | | cleanupTaskCompletionSource.TrySetResult(true); |
| | 0 | 43 | | } |
| | | 44 | | |
| | | 45 | | public bool Contains(TKey key) |
| | | 46 | | { |
| | 0 | 47 | | ThrowIfClosed(); |
| | | 48 | | |
| | 0 | 49 | | return dictionary.TryGetValue(key, out var expiration) && expiration > DateTimeOffset.UtcNow; |
| | | 50 | | } |
| | | 51 | | |
| | | 52 | | public void Close() |
| | | 53 | | { |
| | 0 | 54 | | if (Interlocked.Exchange(ref closeSignaled, 1) != 0) |
| | | 55 | | { |
| | 0 | 56 | | return; |
| | | 57 | | } |
| | | 58 | | |
| | 0 | 59 | | closed = true; |
| | | 60 | | |
| | 0 | 61 | | tokenSource.Cancel(); |
| | 0 | 62 | | cleanupTaskCompletionSource.TrySetCanceled(); |
| | 0 | 63 | | dictionary.Clear(); |
| | 0 | 64 | | tokenSource.Dispose(); |
| | 0 | 65 | | } |
| | | 66 | | |
| | | 67 | | public async Task CollectExpiredEntriesAsync(CancellationToken token) |
| | | 68 | | { |
| | 26 | 69 | | while (!token.IsCancellationRequested) |
| | | 70 | | { |
| | | 71 | | try |
| | | 72 | | { |
| | 26 | 73 | | await cleanupTaskCompletionSource.Task.ConfigureAwait(false); |
| | 0 | 74 | | await Task.Delay(delayBetweenCleanups, token).ConfigureAwait(false); |
| | 0 | 75 | | } |
| | 0 | 76 | | catch (OperationCanceledException) |
| | | 77 | | { |
| | 0 | 78 | | return; |
| | | 79 | | } |
| | | 80 | | |
| | 0 | 81 | | var isEmpty = true; |
| | 0 | 82 | | var utcNow = DateTimeOffset.UtcNow; |
| | 0 | 83 | | foreach (var kvp in dictionary) |
| | | 84 | | { |
| | 0 | 85 | | isEmpty = false; |
| | 0 | 86 | | var expiration = kvp.Value; |
| | 0 | 87 | | if (utcNow > expiration) |
| | | 88 | | { |
| | 0 | 89 | | dictionaryAsCollection.Remove(kvp); |
| | | 90 | | } |
| | | 91 | | } |
| | | 92 | | |
| | 0 | 93 | | if (isEmpty) |
| | | 94 | | { |
| | 0 | 95 | | cleanupTaskCompletionSource = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsy |
| | | 96 | | } |
| | | 97 | | } |
| | 0 | 98 | | } |
| | | 99 | | |
| | | 100 | | public void ThrowIfClosed() |
| | | 101 | | { |
| | 0 | 102 | | if (closed) |
| | | 103 | | { |
| | 0 | 104 | | throw new ObjectDisposedException($"ConcurrentExpiringSet has already been closed. Please create a new s |
| | | 105 | | } |
| | 0 | 106 | | } |
| | | 107 | | } |
| | | 108 | | } |