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using System;
using System.Collections.Generic;
using System.Text;
using System.Workflow.Runtime.Hosting;
using System.Workflow.ComponentModel;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Collections;
namespace System.Workflow.Runtime
{
[Serializable]
[Obsolete("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")]
public class TimerEventSubscriptionCollection : ICollection
{
[SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes",
Justification = "Design has been approved. This is a false positive. DependencyProperty is an immutable type.")]
public readonly static DependencyProperty TimerCollectionProperty = DependencyProperty.RegisterAttached("TimerCollection", typeof(TimerEventSubscriptionCollection), typeof(TimerEventSubscriptionCollection));
private object locker = new Object();
private KeyedPriorityQueue<Guid, TimerEventSubscription, DateTime> queue = new KeyedPriorityQueue<Guid, TimerEventSubscription, DateTime>();
#pragma warning disable 0414
private bool suspended = false; // no longer used but required for binary compatibility of serialization format
#pragma warning restore 0414
[NonSerialized]
private IWorkflowCoreRuntime executor;
private Guid instanceId;
internal TimerEventSubscriptionCollection(IWorkflowCoreRuntime executor, Guid instanceId)
{
this.executor = executor;
this.instanceId = instanceId;
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "TimerEventSubscriptionQueue: {0} Created", instanceId);
this.queue.FirstElementChanged += OnFirstElementChanged;
}
internal void Enqueue(TimerEventSubscription timerEventSubscription)
{
lock (locker)
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "TimerEventSubscriptionQueue: {0} Enqueue Timer {1} for {2} ", instanceId, timerEventSubscription.SubscriptionId, timerEventSubscription.ExpiresAt);
queue.Enqueue(timerEventSubscription.SubscriptionId, timerEventSubscription, timerEventSubscription.ExpiresAt);
}
}
internal IWorkflowCoreRuntime Executor
{
get { return executor; }
set { executor = value; }
}
public TimerEventSubscription Peek()
{
lock (locker)
{
return queue.Peek();
}
}
internal TimerEventSubscription Dequeue()
{
lock (locker)
{
TimerEventSubscription retval = queue.Dequeue();
if (retval != null)
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "TimerEventSubscriptionQueue: {0} Dequeue Timer {1} for {2} ", instanceId, retval.SubscriptionId, retval.ExpiresAt);
return retval;
}
}
public void Remove(Guid timerSubscriptionId)
{
lock (locker)
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "TimerEventSubscriptionQueue: {0} Remove Timer {1}", instanceId, timerSubscriptionId);
queue.Remove(timerSubscriptionId);
}
}
private void OnFirstElementChanged(object source, KeyedPriorityQueueHeadChangedEventArgs<TimerEventSubscription> e)
{
lock (locker)
{
ITimerService timerService = this.executor.GetService(typeof(ITimerService)) as ITimerService;
if (e.NewFirstElement != null && executor != null)
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "TimerEventSubscriptionQueue: {0} Schedule Timer {1} for {2} ", instanceId, e.NewFirstElement.SubscriptionId, e.NewFirstElement.ExpiresAt);
timerService.ScheduleTimer(executor.ProcessTimersCallback, e.NewFirstElement.WorkflowInstanceId, e.NewFirstElement.ExpiresAt, e.NewFirstElement.SubscriptionId);
}
if (e.OldFirstElement != null)
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "TimerEventSubscriptionQueue: {0} Unschedule Timer {1} for {2} ", instanceId, e.OldFirstElement.SubscriptionId, e.OldFirstElement.ExpiresAt);
timerService.CancelTimer(e.OldFirstElement.SubscriptionId);
}
}
}
internal void SuspendDelivery()
{
lock (locker)
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "TimerEventSubscriptionQueue: {0} Suspend", instanceId);
WorkflowSchedulerService schedulerService = this.executor.GetService(typeof(WorkflowSchedulerService)) as WorkflowSchedulerService;
TimerEventSubscription sub = queue.Peek();
if (sub != null)
{
schedulerService.Cancel(sub.SubscriptionId);
}
}
}
internal void ResumeDelivery()
{
lock (locker)
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "TimerEventSubscriptionQueue: {0} Resume", instanceId);
WorkflowSchedulerService schedulerService = this.executor.GetService(typeof(WorkflowSchedulerService)) as WorkflowSchedulerService;
TimerEventSubscription sub = queue.Peek();
if (sub != null)
{
schedulerService.Schedule(executor.ProcessTimersCallback, sub.WorkflowInstanceId, sub.ExpiresAt, sub.SubscriptionId);
}
}
}
public void Add(TimerEventSubscription item)
{
if (item == null)
throw new ArgumentNullException("item");
this.Enqueue(item);
}
public void Remove(TimerEventSubscription item)
{
if (item == null)
throw new ArgumentNullException("item");
this.Remove(item.SubscriptionId);
}
#region ICollection Members
public void CopyTo(Array array, int index)
{
TimerEventSubscription[] tes = null;
lock (locker)
{
tes = new TimerEventSubscription[queue.Count];
queue.Values.CopyTo(tes, 0);
}
if (tes != null)
tes.CopyTo(array, index);
}
public int Count
{
get
{
return queue.Count;
}
}
public bool IsSynchronized
{
get
{
return true;
}
}
public object SyncRoot
{
get
{
return locker;
}
}
#endregion
#region IEnumerable Members
public IEnumerator GetEnumerator()
{
return queue.Values.GetEnumerator();
}
#endregion
}
}
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