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Scheduler.Simple.cs
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Scheduler.Simple.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT License.
// See the LICENSE file in the project root for more information.
using System.Reactive.Disposables;
namespace System.Reactive.Concurrency
{
public static partial class Scheduler
{
/// <summary>
/// Schedules an action to be executed.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="action">Action to execute.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
public static IDisposable Schedule(this IScheduler scheduler, Action action)
{
if (scheduler == null)
{
throw new ArgumentNullException(nameof(scheduler));
}
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
// Surprisingly, passing the method group of Invoke will create a fresh
// delegate each time although it's static, while an anonymous
// lambda without the need of a closure will be cached.
// Once Roslyn supports caching delegates for method groups,
// the anonymous lambda can be replaced by the method group again. Until then,
// to avoid the repetition of code, the call to Invoke is left intact.
// Watch https://github.com/dotnet/roslyn/issues/5835
return scheduler.Schedule(action, static (_, a) => Invoke(a));
}
/// <summary>
/// Schedules an action to be executed.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="state">A state object to be passed to <paramref name="action"/>.</param>
/// <param name="action">Action to execute.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
// Note: The naming of that method differs because otherwise, the signature would cause ambiguities.
internal static IDisposable ScheduleAction<TState>(this IScheduler scheduler, TState state, Action<TState> action)
{
if (scheduler == null)
{
throw new ArgumentNullException(nameof(scheduler));
}
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
return scheduler.Schedule(
(action, state),
(_, tuple) =>
{
tuple.action(tuple.state);
return Disposable.Empty;
});
}
/// <summary>
/// Schedules an action to be executed.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="state">A state object to be passed to <paramref name="action"/>.</param>
/// <param name="action">Action to execute.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
// Note: The naming of that method differs because otherwise, the signature would cause ambiguities.
internal static IDisposable ScheduleAction<TState>(this IScheduler scheduler, TState state, Func<TState, IDisposable> action)
{
if (scheduler == null)
throw new ArgumentNullException(nameof(scheduler));
if (action == null)
throw new ArgumentNullException(nameof(action));
return scheduler.Schedule(
(action, state),
static (_, tuple) => tuple.action(tuple.state));
}
/// <summary>
/// Schedules an action to be executed after the specified relative due time.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="action">Action to execute.</param>
/// <param name="dueTime">Relative time after which to execute the action.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
public static IDisposable Schedule(this IScheduler scheduler, TimeSpan dueTime, Action action)
{
if (scheduler == null)
{
throw new ArgumentNullException(nameof(scheduler));
}
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
// See note above.
return scheduler.Schedule(action, dueTime, static (_, a) => Invoke(a));
}
/// <summary>
/// Schedules an action to be executed after the specified relative due time.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="action">Action to execute.</param>
/// <param name="state">A state object to be passed to <paramref name="action"/>.</param>
/// <param name="dueTime">Relative time after which to execute the action.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
internal static IDisposable ScheduleAction<TState>(this IScheduler scheduler, TState state, TimeSpan dueTime, Action<TState> action)
{
if (scheduler == null)
{
throw new ArgumentNullException(nameof(scheduler));
}
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
// See note above.
return scheduler.Schedule((state, action), dueTime, static (_, tuple) => Invoke(tuple));
}
/// <summary>
/// Schedules an action to be executed after the specified relative due time.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="action">Action to execute.</param>
/// <param name="state">A state object to be passed to <paramref name="action"/>.</param>
/// <param name="dueTime">Relative time after which to execute the action.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
internal static IDisposable ScheduleAction<TState>(this IScheduler scheduler, TState state, TimeSpan dueTime, Func<TState, IDisposable> action)
{
if (scheduler == null)
throw new ArgumentNullException(nameof(scheduler));
if (action == null)
throw new ArgumentNullException(nameof(action));
// See note above.
return scheduler.Schedule((state, action), dueTime, static (_, tuple) => Invoke(tuple));
}
/// <summary>
/// Schedules an action to be executed at the specified absolute due time.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="action">Action to execute.</param>
/// <param name="dueTime">Absolute time at which to execute the action.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
public static IDisposable Schedule(this IScheduler scheduler, DateTimeOffset dueTime, Action action)
{
if (scheduler == null)
{
throw new ArgumentNullException(nameof(scheduler));
}
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
// See note above.
return scheduler.Schedule(action, dueTime, static (_, a) => Invoke(a));
}
/// <summary>
/// Schedules an action to be executed after the specified relative due time.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="action">Action to execute.</param>
/// <param name="state">A state object to be passed to <paramref name="action"/>.</param>
/// <param name="dueTime">Relative time after which to execute the action.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
internal static IDisposable ScheduleAction<TState>(this IScheduler scheduler, TState state, DateTimeOffset dueTime, Action<TState> action)
{
if (scheduler == null)
{
throw new ArgumentNullException(nameof(scheduler));
}
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
// See note above.
return scheduler.Schedule((state, action), dueTime, static (_, tuple) => Invoke(tuple));
}
/// <summary>
/// Schedules an action to be executed after the specified relative due time.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="action">Action to execute.</param>
/// <param name="state">A state object to be passed to <paramref name="action"/>.</param>
/// <param name="dueTime">Relative time after which to execute the action.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
internal static IDisposable ScheduleAction<TState>(this IScheduler scheduler, TState state, DateTimeOffset dueTime, Func<TState, IDisposable> action)
{
if (scheduler == null)
throw new ArgumentNullException(nameof(scheduler));
if (action == null)
throw new ArgumentNullException(nameof(action));
// See note above.
return scheduler.Schedule((state, action), dueTime, static (_, tuple) => Invoke(tuple));
}
/// <summary>
/// Schedules an action to be executed.
/// </summary>
/// <param name="scheduler">Scheduler to execute the action on.</param>
/// <param name="action">Action to execute.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
public static IDisposable ScheduleLongRunning(this ISchedulerLongRunning scheduler, Action<ICancelable> action)
{
if (scheduler == null)
{
throw new ArgumentNullException(nameof(scheduler));
}
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
return scheduler.ScheduleLongRunning(action, static (a, c) => a(c));
}
private static IDisposable Invoke(Action action)
{
action();
return Disposable.Empty;
}
private static IDisposable Invoke<TState>((TState state, Action<TState> action) tuple)
{
tuple.action(tuple.state);
return Disposable.Empty;
}
private static IDisposable Invoke<TState>((TState state, Func<TState, IDisposable> action) tuple)
{
return tuple.action(tuple.state);
}
}
}