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Finishing an operation started via `OngoingOperationTracker.BeginOperation()` was risky in cases where the operation ended at a callback on another thread (which, in the case of multiplayer, is *most* cases). In particular, if any consumer registered a callback that mutates transforms when the operation ends, it would result in crashes after the framework-side safety checks. Rework `OngoingOperationTracker` into an always-present component residing in the drawable hierarchy, and ensure that the `operationInProgress` bindable is always updated on the update thread. This way consumers don't have to add local schedules in multiple places.
60 lines
2.0 KiB
C#
60 lines
2.0 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using osu.Framework.Allocation;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
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namespace osu.Game.Screens.OnlinePlay
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{
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/// <summary>
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/// Utility class to track ongoing online operations' progress.
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/// Can be used to disable interactivity while waiting for a response from online sources.
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/// </summary>
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public class OngoingOperationTracker : Component
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{
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/// <summary>
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/// Whether there is an online operation in progress.
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/// </summary>
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public IBindable<bool> InProgress => inProgress;
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private readonly Bindable<bool> inProgress = new BindableBool();
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private LeasedBindable<bool> leasedInProgress;
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public OngoingOperationTracker()
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{
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AlwaysPresent = true;
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}
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/// <summary>
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/// Begins tracking a new online operation.
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/// </summary>
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/// <returns>
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/// An <see cref="IDisposable"/> that will automatically mark the operation as ended on disposal.
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/// </returns>
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/// <exception cref="InvalidOperationException">An operation has already been started.</exception>
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public IDisposable BeginOperation()
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{
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if (leasedInProgress != null)
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throw new InvalidOperationException("Cannot begin operation while another is in progress.");
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leasedInProgress = inProgress.BeginLease(true);
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leasedInProgress.Value = true;
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// for extra safety, marshal the end of operation back to the update thread if necessary.
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return new InvokeOnDisposal(() => Scheduler.Add(endOperation, false));
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}
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private void endOperation()
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{
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if (leasedInProgress == null)
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throw new InvalidOperationException("Cannot end operation multiple times.");
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leasedInProgress.Return();
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leasedInProgress = null;
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}
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}
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}
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