ThreadPerTaskScheduler.cs

// 
//  Copyright (c) Microsoft Corporation. All rights reserved. 
//  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 Microsoft.PackageManagement.Internal.Utility.Extensions {
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading;
    using System.Threading.Tasks;

    internal class ThreadPerTaskScheduler : TaskScheduler {
        /// <summary>Gets the tasks currently scheduled to this scheduler.</summary>
        /// <remarks>This will always return an empty enumerable, as tasks are launched as soon as they're queued.</remarks>
        protected override IEnumerable<Task> GetScheduledTasks() {
            return Enumerable.Empty<Task>();
        }

        /// <summary>Starts a new thread to process the provided task.</summary>
        /// <param name="task">The task to be executed.</param>
        protected override void QueueTask(Task task) {
            new Thread(() => TryExecuteTask(task)) {
                IsBackground = true
            }.Start();
        }

        /// <summary>Runs the provided task on the current thread.</summary>
        /// <param name="task">The task to be executed.</param>
        /// <param name="taskWasPreviouslyQueued">Ignored.</param>
        /// <returns>Whether the task could be executed on the current thread.</returns>
        protected override bool TryExecuteTaskInline(Task task, bool taskWasPreviouslyQueued) {
            return TryExecuteTask(task);
        }
    }
}