| | | 1 | | using TeleFlow.Framework.States; |
| | | 2 | | |
| | | 3 | | namespace TeleFlow.Storage.Memory; |
| | | 4 | | |
| | | 5 | | public sealed class MemoryStateHistoryStore : IStateHistoryStore |
| | | 6 | | { |
| | 31 | 7 | | private readonly object _gate = new(); |
| | 31 | 8 | | private readonly Dictionary<StateKey, List<string>> _history = []; |
| | | 9 | | |
| | | 10 | | public ValueTask<IReadOnlyList<string>> GetHistoryAsync( |
| | | 11 | | StateKey key, |
| | | 12 | | CancellationToken cancellationToken = default) |
| | | 13 | | { |
| | 18 | 14 | | cancellationToken.ThrowIfCancellationRequested(); |
| | | 15 | | |
| | 17 | 16 | | lock (_gate) |
| | | 17 | | { |
| | 17 | 18 | | if (!_history.TryGetValue(key, out var history)) |
| | | 19 | | { |
| | 7 | 20 | | return ValueTask.FromResult<IReadOnlyList<string>>([]); |
| | | 21 | | } |
| | | 22 | | |
| | 10 | 23 | | return ValueTask.FromResult<IReadOnlyList<string>>(history.ToArray()); |
| | | 24 | | } |
| | 17 | 25 | | } |
| | | 26 | | |
| | | 27 | | public ValueTask PushAsync( |
| | | 28 | | StateKey key, |
| | | 29 | | string stateId, |
| | | 30 | | CancellationToken cancellationToken = default) |
| | | 31 | | { |
| | 14 | 32 | | cancellationToken.ThrowIfCancellationRequested(); |
| | 13 | 33 | | ArgumentException.ThrowIfNullOrWhiteSpace(stateId); |
| | | 34 | | |
| | 12 | 35 | | lock (_gate) |
| | | 36 | | { |
| | 12 | 37 | | if (!_history.TryGetValue(key, out var history)) |
| | | 38 | | { |
| | 10 | 39 | | history = []; |
| | 10 | 40 | | _history.Add(key, history); |
| | | 41 | | } |
| | | 42 | | |
| | 12 | 43 | | history.Add(stateId); |
| | 12 | 44 | | } |
| | | 45 | | |
| | 12 | 46 | | return ValueTask.CompletedTask; |
| | | 47 | | } |
| | | 48 | | |
| | | 49 | | public ValueTask<string?> PopAsync( |
| | | 50 | | StateKey key, |
| | | 51 | | CancellationToken cancellationToken = default) |
| | | 52 | | { |
| | 7 | 53 | | cancellationToken.ThrowIfCancellationRequested(); |
| | | 54 | | |
| | 6 | 55 | | lock (_gate) |
| | | 56 | | { |
| | 6 | 57 | | if (!TryPeek(key, out var history, out var state)) |
| | | 58 | | { |
| | 2 | 59 | | return ValueTask.FromResult<string?>(null); |
| | | 60 | | } |
| | | 61 | | |
| | 4 | 62 | | history.RemoveAt(history.Count - 1); |
| | | 63 | | |
| | 4 | 64 | | if (history.Count == 0) |
| | | 65 | | { |
| | 3 | 66 | | _history.Remove(key); |
| | | 67 | | } |
| | | 68 | | |
| | 4 | 69 | | return ValueTask.FromResult<string?>(state); |
| | | 70 | | } |
| | 6 | 71 | | } |
| | | 72 | | |
| | | 73 | | public ValueTask<string?> PeekAsync( |
| | | 74 | | StateKey key, |
| | | 75 | | CancellationToken cancellationToken = default) |
| | | 76 | | { |
| | 9 | 77 | | cancellationToken.ThrowIfCancellationRequested(); |
| | | 78 | | |
| | 8 | 79 | | lock (_gate) |
| | | 80 | | { |
| | 8 | 81 | | if (!TryPeek(key, out _, out var state)) |
| | | 82 | | { |
| | 3 | 83 | | return ValueTask.FromResult<string?>(null); |
| | | 84 | | } |
| | | 85 | | |
| | 5 | 86 | | return ValueTask.FromResult<string?>(state); |
| | | 87 | | } |
| | 8 | 88 | | } |
| | | 89 | | |
| | | 90 | | public ValueTask ClearAsync( |
| | | 91 | | StateKey key, |
| | | 92 | | CancellationToken cancellationToken = default) |
| | | 93 | | { |
| | 5 | 94 | | cancellationToken.ThrowIfCancellationRequested(); |
| | | 95 | | |
| | 4 | 96 | | lock (_gate) |
| | | 97 | | { |
| | 4 | 98 | | _history.Remove(key); |
| | 4 | 99 | | } |
| | | 100 | | |
| | 4 | 101 | | return ValueTask.CompletedTask; |
| | | 102 | | } |
| | | 103 | | |
| | | 104 | | private bool TryPeek( |
| | | 105 | | StateKey key, |
| | | 106 | | out List<string> history, |
| | | 107 | | out string? state) |
| | | 108 | | { |
| | 14 | 109 | | if (!_history.TryGetValue(key, out history!) || |
| | 14 | 110 | | history.Count == 0) |
| | | 111 | | { |
| | 5 | 112 | | state = null; |
| | 5 | 113 | | return false; |
| | | 114 | | } |
| | | 115 | | |
| | 9 | 116 | | state = history[^1]; |
| | 9 | 117 | | return true; |
| | | 118 | | } |
| | | 119 | | } |