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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
// This file contain internal APIs that are subject to change without notice.
// Use at your own risk.
//
using System;
using System.Threading.Tasks;
using Microsoft.VisualStudio.Threading;
namespace Microsoft.VisualStudio.Utilities
{
/// <summary>
/// A helper for managing JoinableTasks.
/// </summary>
public class JoinableTaskHelper
{
public readonly JoinableTaskContext Context;
public readonly JoinableTaskCollection Collection;
public readonly JoinableTaskFactory Factory;
public JoinableTaskHelper(JoinableTaskContext context)
{
if (context == null)
throw new ArgumentNullException(nameof(context));
this.Context = context;
this.Collection = context.CreateCollection();
this.Factory = context.CreateFactory(this.Collection);
}
public JoinableTask RunOnUIThread(Action action, bool forceTaskSwitch = true)
{
using (this.Context.SuppressRelevance())
{
return this.Factory.RunAsync(async delegate
{
if (forceTaskSwitch && this.Context.IsOnMainThread)
{
await Task.Yield();
}
await this.Factory.SwitchToMainThreadAsync();
action();
});
}
}
public JoinableTask<T> RunOnUIThread<T>(Func<T> function, bool forceTaskSwitch = true)
{
using (this.Context.SuppressRelevance())
{
return this.Factory.RunAsync(async delegate
{
if (forceTaskSwitch && this.Context.IsOnMainThread)
{
await Task.Yield();
}
await this.Factory.SwitchToMainThreadAsync();
return function();
});
}
}
public async Task DisposeAsync()
{
await this.Collection.JoinTillEmptyAsync();
}
public void Dispose()
{
this.Context.Factory.Run(async delegate { // Not this.Factory
await this.DisposeAsync();
});
}
}
}
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