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PendingTaskRepository.cs
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// Copyright © 2015 The CefSharp Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
namespace CefSharp.Internals
{
/// <summary>
/// Class to store TaskCompletionSources indexed by a unique id. There are two distinct ConcurrentDictionary
/// instances as we have some Tasks that are created from the browser process (EvaluateScriptAsync) calls, and
/// some that are created for <see cref="IJavascriptCallback"/> instances for which the Id's are created
/// in the render process.
/// </summary>
/// <typeparam name="TResult">The type of the result produced by the tasks held.</typeparam>
public sealed class PendingTaskRepository<TResult>
{
private readonly ConcurrentDictionary<long, TaskCompletionSource<TResult>> pendingTasks =
new ConcurrentDictionary<long, TaskCompletionSource<TResult>>();
private readonly ConcurrentDictionary<long, TaskCompletionSource<TResult>> callbackPendingTasks =
new ConcurrentDictionary<long, TaskCompletionSource<TResult>>();
//should only be accessed by Interlocked.Increment
private long lastId;
/// <summary>
/// Creates a new pending task with a timeout.
/// </summary>
/// <param name="timeout">The maximum running time of the task.</param>
/// <returns>The unique id of the newly created pending task and the newly created <see cref="TaskCompletionSource{TResult}"/>.</returns>
public KeyValuePair<long, TaskCompletionSource<TResult>> CreatePendingTask(TimeSpan? timeout = null)
{
var taskCompletionSource = new TaskCompletionSource<TResult>(TaskCreationOptions.RunContinuationsAsynchronously);
var id = Interlocked.Increment(ref lastId);
pendingTasks.TryAdd(id, taskCompletionSource);
if (timeout.HasValue)
{
taskCompletionSource = taskCompletionSource.WithTimeout(timeout.Value, () => RemovePendingTask(id));
}
return new KeyValuePair<long, TaskCompletionSource<TResult>>(id, taskCompletionSource);
}
/// <summary>
/// Creates a new pending task with a timeout.
/// </summary>
/// <param name="id">Id passed in from the render process</param>
/// <param name="timeout">The maximum running time of the task.</param>
/// <returns>The unique id of the newly created pending task and the newly created <see cref="TaskCompletionSource{TResult}"/>.</returns>
public KeyValuePair<long, TaskCompletionSource<TResult>> CreateJavascriptCallbackPendingTask(long id, TimeSpan? timeout = null)
{
var taskCompletionSource = new TaskCompletionSource<TResult>(TaskCreationOptions.RunContinuationsAsynchronously);
callbackPendingTasks.TryAdd(id, taskCompletionSource);
if (timeout.HasValue)
{
taskCompletionSource = taskCompletionSource.WithTimeout(timeout.Value, () => RemoveJavascriptCallbackPendingTask(id));
}
return new KeyValuePair<long, TaskCompletionSource<TResult>>(id, taskCompletionSource);
}
/// <summary>
/// If a <see cref="TaskCompletionSource{TResult}"/> is found matching <paramref name="id"/>
/// then it is removed from the ConcurrentDictionary and returned.
/// </summary>
/// <param name="id">Unique id of the pending task.</param>
/// <returns>
/// The <see cref="TaskCompletionSource{TResult}"/> associated with the given id
/// or null if no matching TaskComplectionSource found.
/// </returns>
public TaskCompletionSource<TResult> RemovePendingTask(long id)
{
TaskCompletionSource<TResult> result;
if (pendingTasks.TryRemove(id, out result))
{
return result;
}
return null;
}
/// <summary>
/// If a <see cref="TaskCompletionSource{TResult}"/> is found matching <paramref name="id"/>
/// then it is removed from the ConcurrentDictionary and returned.
/// </summary>
/// <param name="id">Unique id of the pending task.</param>
/// <returns>
/// The <see cref="TaskCompletionSource{TResult}"/> associated with the given id
/// or null if no matching TaskComplectionSource found.
/// </returns>
public TaskCompletionSource<TResult> RemoveJavascriptCallbackPendingTask(long id)
{
TaskCompletionSource<TResult> result;
if (callbackPendingTasks.TryRemove(id, out result))
{
return result;
}
return null;
}
}
}