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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities
{
using System;
using System.Activities.DynamicUpdate;
using System.Activities.Hosting;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Runtime;
using System.Runtime.DurableInstancing;
using System.Threading;
using System.Xml.Linq;
// Wrapper over instance data retrieved from the Instance Store but not yet loaded into a WorkflowApplication.
// Once this instance is loaded into a WFApp using WFApp.Load(), this object is stale and trying to abort or reload it wil throw.
// Free-threaded: needs to be resillient to simultaneous loads/aborts on multiple threads
public class WorkflowApplicationInstance
{
private int state;
internal WorkflowApplicationInstance(
WorkflowApplication.PersistenceManagerBase persistenceManager,
IDictionary<XName, InstanceValue> values,
WorkflowIdentity definitionIdentity)
{
this.PersistenceManager = persistenceManager;
this.Values = values;
this.DefinitionIdentity = definitionIdentity;
this.state = (int)State.Initialized;
}
private enum State
{
Initialized,
Loaded,
Aborted
}
public WorkflowIdentity DefinitionIdentity
{
get;
private set;
}
public InstanceStore InstanceStore
{
get
{
return this.PersistenceManager.InstanceStore;
}
}
public Guid InstanceId
{
get
{
return this.PersistenceManager.InstanceId;
}
}
internal WorkflowApplication.PersistenceManagerBase PersistenceManager
{
get;
private set;
}
internal IDictionary<XName, InstanceValue> Values
{
get;
private set;
}
public void Abandon()
{
this.Abandon(ActivityDefaults.DeleteTimeout);
}
public void Abandon(TimeSpan timeout)
{
TimeoutHelper.ThrowIfNegativeArgument(timeout);
this.MarkAsAbandoned();
WorkflowApplication.DiscardInstance(this.PersistenceManager, timeout);
}
public IAsyncResult BeginAbandon(AsyncCallback callback, object state)
{
return this.BeginAbandon(ActivityDefaults.DeleteTimeout, callback, state);
}
public IAsyncResult BeginAbandon(TimeSpan timeout, AsyncCallback callback, object state)
{
TimeoutHelper.ThrowIfNegativeArgument(timeout);
this.MarkAsAbandoned();
return WorkflowApplication.BeginDiscardInstance(this.PersistenceManager, timeout, callback, state);
}
public void EndAbandon(IAsyncResult asyncResult)
{
WorkflowApplication.EndDiscardInstance(asyncResult);
}
[SuppressMessage(FxCop.Category.Design, FxCop.Rule.AvoidOutParameters, Justification = "Approved Design. Returning a bool makes the intent much clearer than something that just returns a list.")]
public bool CanApplyUpdate(DynamicUpdateMap updateMap, out IList<ActivityBlockingUpdate> activitiesBlockingUpdate)
{
if (updateMap == null)
{
throw FxTrace.Exception.ArgumentNull("updateMap");
}
activitiesBlockingUpdate = WorkflowApplication.GetActivitiesBlockingUpdate(this, updateMap);
return activitiesBlockingUpdate == null || activitiesBlockingUpdate.Count == 0;
}
internal void MarkAsLoaded()
{
int oldState = Interlocked.CompareExchange(ref this.state, (int)State.Loaded, (int)State.Initialized);
this.ThrowIfLoadedOrAbandoned((State)oldState);
}
private void MarkAsAbandoned()
{
int oldState = Interlocked.CompareExchange(ref this.state, (int)State.Aborted, (int)State.Initialized);
this.ThrowIfLoadedOrAbandoned((State)oldState);
}
private void ThrowIfLoadedOrAbandoned(State oldState)
{
if (oldState == State.Loaded)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.WorkflowApplicationInstanceLoaded));
}
if (oldState == State.Aborted)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.WorkflowApplicationInstanceAbandoned));
}
}
}
}
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