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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
namespace System.Reactive.Concurrency
{
/// <summary>
/// Abstract base class for machine-local schedulers, using the local system clock for time-based operations.
/// </summary>
public abstract partial class LocalScheduler : IScheduler, IStopwatchProvider, IServiceProvider
{
/// <summary>
/// Gets the scheduler's notion of current time.
/// </summary>
public virtual DateTimeOffset Now
{
get { return Scheduler.Now; }
}
/// <summary>
/// Schedules an action to be executed.
/// </summary>
/// <typeparam name="TState">The type of the state passed to the scheduled action.</typeparam>
/// <param name="state">State passed to the action to be executed.</param>
/// <param name="action">Action to be executed.</param>
/// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
/// <exception cref="ArgumentNullException"><paramref name="action"/> is null.</exception>
public virtual IDisposable Schedule<TState>(TState state, Func<IScheduler, TState, IDisposable> action)
{
if (action == null)
throw new ArgumentNullException("action");
return Schedule(state, TimeSpan.Zero, action);
}
/// <summary>
/// Schedules an action to be executed after dueTime.
/// </summary>
/// <typeparam name="TState">The type of the state passed to the scheduled action.</typeparam>
/// <param name="state">State passed to the action to be executed.</param>
/// <param name="action">Action to be executed.</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>
public abstract IDisposable Schedule<TState>(TState state, TimeSpan dueTime, Func<IScheduler, TState, IDisposable> action);
/// <summary>
/// Schedules an action to be executed at dueTime.
/// </summary>
/// <typeparam name="TState">The type of the state passed to the scheduled action.</typeparam>
/// <param name="state">State passed to the action to be executed.</param>
/// <param name="action">Action to be executed.</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="action"/> is null.</exception>
public virtual IDisposable Schedule<TState>(TState state, DateTimeOffset dueTime, Func<IScheduler, TState, IDisposable> action)
{
if (action == null)
throw new ArgumentNullException("action");
return Enqueue(this, state, dueTime, action);
}
/// <summary>
/// Starts a new stopwatch object.
/// </summary>
/// <returns>New stopwatch object; started at the time of the request.</returns>
/// <remarks>
/// Platform-specific scheduler implementations should reimplement IStopwatchProvider to provide a more
/// efficient IStopwatch implementation (if available).
/// </remarks>
public virtual IStopwatch StartStopwatch()
{
return ConcurrencyAbstractionLayer.Current.StartStopwatch();
}
object IServiceProvider.GetService(Type serviceType)
{
return GetService(serviceType);
}
/// <summary>
/// Discovers scheduler services by interface type. The base class implementation returns
/// requested services for each scheduler interface implemented by the derived class. For
/// more control over service discovery, derived types can override this method.
/// </summary>
/// <param name="serviceType">Scheduler service interface type to discover.</param>
/// <returns>Object implementing the requested service, if available; null otherwise.</returns>
protected virtual object GetService(Type serviceType)
{
#if !NO_PERF
if (serviceType == typeof(IStopwatchProvider))
return this as IStopwatchProvider;
else if (serviceType == typeof(ISchedulerLongRunning))
return this as ISchedulerLongRunning;
else if (serviceType == typeof(ISchedulerPeriodic))
return this as ISchedulerPeriodic;
#endif
return null;
}
}
}
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