| /* |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| namespace DotPulsar.Internal |
| { |
| using System.Collections.Generic; |
| using System.Threading; |
| using System.Threading.Tasks; |
| |
| public sealed class StateTaskCollection<TState> where TState : notnull |
| { |
| private readonly object _lock; |
| private readonly LinkedList<StateTask<TState>> _awaiters; |
| |
| public StateTaskCollection() |
| { |
| _lock = new object(); |
| _awaiters = new LinkedList<StateTask<TState>>(); |
| } |
| |
| public Task<TState> CreateTaskFor(TState state, StateChanged changed, CancellationToken cancellationToken) |
| { |
| LinkedListNode<StateTask<TState>> node; |
| |
| lock (_lock) |
| { |
| node = _awaiters.AddFirst(new StateTask<TState>(state, changed)); |
| } |
| |
| node.Value.CancelableCompletionSource.SetupCancellation(() => TaskWasCanceled(node), cancellationToken); |
| |
| return node.Value.CancelableCompletionSource.Task; |
| } |
| |
| public void CompleteTasksAwaiting(TState state) |
| { |
| lock (_lock) |
| { |
| var awaiter = _awaiters.First; |
| |
| while (awaiter != null) |
| { |
| var next = awaiter.Next; |
| |
| if (awaiter.Value.IsAwaiting(state)) |
| { |
| _awaiters.Remove(awaiter); |
| awaiter.Value.CancelableCompletionSource.SetResult(state); |
| awaiter.Value.CancelableCompletionSource.Dispose(); |
| } |
| |
| awaiter = next; |
| } |
| } |
| } |
| |
| public void CompleteAllTasks(TState state) |
| { |
| lock (_lock) |
| { |
| foreach (var awaiter in _awaiters) |
| { |
| awaiter.CancelableCompletionSource.SetResult(state); |
| awaiter.CancelableCompletionSource.Dispose(); |
| } |
| |
| _awaiters.Clear(); |
| } |
| } |
| |
| private void TaskWasCanceled(LinkedListNode<StateTask<TState>> node) |
| { |
| lock (_lock) |
| { |
| try |
| { |
| _awaiters.Remove(node); |
| node.Value.Dispose(); |
| } |
| catch |
| { |
| // Ignore |
| } |
| } |
| } |
| } |
| } |