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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;
using System.Reactive.Disposables;
namespace System.Reactive.Concurrency
{
public static partial class Scheduler
{
/// <summary>
/// Schedules an action to be executed recursively.
/// </summary>
/// <param name="scheduler">Scheduler to execute the recursive action on.</param>
/// <param name="action">Action to execute recursively. The parameter passed to the action is used to trigger recursive scheduling of 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 null.</exception>
public static IDisposable Schedule(this IScheduler scheduler, Action<Action> action)
{
if (scheduler == null)
throw new ArgumentNullException("scheduler");
if (action == null)
throw new ArgumentNullException("action");
return scheduler.Schedule(action, (_action, self) => _action(() => self(_action)));
}
/// <summary>
/// Schedules an action to be executed recursively.
/// </summary>
/// <typeparam name="TState">The type of the state passed to the scheduled action.</typeparam>
/// <param name="scheduler">Scheduler to execute the recursive action on.</param>
/// <param name="state">State passed to the action to be executed.</param>
/// <param name="action">Action to execute recursively. The last parameter passed to the action is used to trigger recursive scheduling of the action, passing in recursive invocation state.</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 null.</exception>
public static IDisposable Schedule<TState>(this IScheduler scheduler, TState state, Action<TState, Action<TState>> action)
{
if (scheduler == null)
throw new ArgumentNullException("scheduler");
if (action == null)
throw new ArgumentNullException("action");
return scheduler.Schedule(new Pair<TState, Action<TState, Action<TState>>> { First = state, Second = action }, InvokeRec1);
}
static IDisposable InvokeRec1<TState>(IScheduler scheduler, Pair<TState, Action<TState, Action<TState>>> pair)
{
var group = new CompositeDisposable(1);
var gate = new object();
var state = pair.First;
var action = pair.Second;
Action<TState> recursiveAction = null;
recursiveAction = state1 => action(state1, state2 =>
{
var isAdded = false;
var isDone = false;
var d = default(IDisposable);
d = scheduler.Schedule(state2, (scheduler1, state3) =>
{
lock (gate)
{
if (isAdded)
group.Remove(d);
else
isDone = true;
}
recursiveAction(state3);
return Disposable.Empty;
});
lock (gate)
{
if (!isDone)
{
group.Add(d);
isAdded = true;
}
}
});
recursiveAction(state);
return group;
}
/// <summary>
/// Schedules an action to be executed recursively after a specified relative due time.
/// </summary>
/// <param name="scheduler">Scheduler to execute the recursive action on.</param>
/// <param name="action">Action to execute recursively. The parameter passed to the action is used to trigger recursive scheduling of the action at the specified relative time.</param>
/// <param name="dueTime">Relative time after which to execute the action for the first time.</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 null.</exception>
public static IDisposable Schedule(this IScheduler scheduler, TimeSpan dueTime, Action<Action<TimeSpan>> action)
{
if (scheduler == null)
throw new ArgumentNullException("scheduler");
if (action == null)
throw new ArgumentNullException("action");
return scheduler.Schedule(action, dueTime, (_action, self) => _action(dt => self(_action, dt)));
}
/// <summary>
/// Schedules an action to be executed recursively after a specified relative due time.
/// </summary>
/// <typeparam name="TState">The type of the state passed to the scheduled action.</typeparam>
/// <param name="scheduler">Scheduler to execute the recursive action on.</param>
/// <param name="state">State passed to the action to be executed.</param>
/// <param name="action">Action to execute recursively. The last parameter passed to the action is used to trigger recursive scheduling of the action, passing in the recursive due time and invocation state.</param>
/// <param name="dueTime">Relative time after which to execute the action for the first time.</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 null.</exception>
public static IDisposable Schedule<TState>(this IScheduler scheduler, TState state, TimeSpan dueTime, Action<TState, Action<TState, TimeSpan>> action)
{
if (scheduler == null)
throw new ArgumentNullException("scheduler");
if (action == null)
throw new ArgumentNullException("action");
return scheduler.Schedule(new Pair<TState, Action<TState, Action<TState, TimeSpan>>> { First = state, Second = action }, dueTime, InvokeRec2);
}
static IDisposable InvokeRec2<TState>(IScheduler scheduler, Pair<TState, Action<TState, Action<TState, TimeSpan>>> pair)
{
var group = new CompositeDisposable(1);
var gate = new object();
var state = pair.First;
var action = pair.Second;
Action<TState> recursiveAction = null;
recursiveAction = state1 => action(state1, (state2, dueTime1) =>
{
var isAdded = false;
var isDone = false;
var d = default(IDisposable);
d = scheduler.Schedule(state2, dueTime1, (scheduler1, state3) =>
{
lock (gate)
{
if (isAdded)
group.Remove(d);
else
isDone = true;
}
recursiveAction(state3);
return Disposable.Empty;
});
lock (gate)
{
if (!isDone)
{
group.Add(d);
isAdded = true;
}
}
});
recursiveAction(state);
return group;
}
/// <summary>
/// Schedules an action to be executed recursively at a specified absolute due time.
/// </summary>
/// <param name="scheduler">Scheduler to execute the recursive action on.</param>
/// <param name="action">Action to execute recursively. The parameter passed to the action is used to trigger recursive scheduling of the action at the specified absolute time.</param>
/// <param name="dueTime">Absolute time at which to execute the action for the first time.</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 null.</exception>
public static IDisposable Schedule(this IScheduler scheduler, DateTimeOffset dueTime, Action<Action<DateTimeOffset>> action)
{
if (scheduler == null)
throw new ArgumentNullException("scheduler");
if (action == null)
throw new ArgumentNullException("action");
return scheduler.Schedule(action, dueTime, (_action, self) => _action(dt => self(_action, dt)));
}
/// <summary>
/// Schedules an action to be executed recursively at a specified absolute due time.
/// </summary>
/// <typeparam name="TState">The type of the state passed to the scheduled action.</typeparam>
/// <param name="scheduler">Scheduler to execute the recursive action on.</param>
/// <param name="state">State passed to the action to be executed.</param>
/// <param name="action">Action to execute recursively. The last parameter passed to the action is used to trigger recursive scheduling of the action, passing in the recursive due time and invocation state.</param>
/// <param name="dueTime">Absolute time at which to execute the action for the first time.</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 null.</exception>
public static IDisposable Schedule<TState>(this IScheduler scheduler, TState state, DateTimeOffset dueTime, Action<TState, Action<TState, DateTimeOffset>> action)
{
if (scheduler == null)
throw new ArgumentNullException("scheduler");
if (action == null)
throw new ArgumentNullException("action");
return scheduler.Schedule(new Pair<TState, Action<TState, Action<TState, DateTimeOffset>>> { First = state, Second = action }, dueTime, InvokeRec3);
}
static IDisposable InvokeRec3<TState>(IScheduler scheduler, Pair<TState, Action<TState, Action<TState, DateTimeOffset>>> pair)
{
var group = new CompositeDisposable(1);
var gate = new object();
var state = pair.First;
var action = pair.Second;
Action<TState> recursiveAction = null;
recursiveAction = state1 => action(state1, (state2, dueTime1) =>
{
var isAdded = false;
var isDone = false;
var d = default(IDisposable);
d = scheduler.Schedule(state2, dueTime1, (scheduler1, state3) =>
{
lock (gate)
{
if (isAdded)
group.Remove(d);
else
isDone = true;
}
recursiveAction(state3);
return Disposable.Empty;
});
lock (gate)
{
if (!isDone)
{
group.Add(d);
isAdded = true;
}
}
});
recursiveAction(state);
return group;
}
#if !NO_SERIALIZABLE
[Serializable]
#endif
struct Pair<T1, T2>
{
public T1 First;
public T2 Second;
}
}
}
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