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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Dispatcher
{
using System.Runtime;
using System.Runtime.Diagnostics;
using System.ServiceModel.Channels;
using System.ServiceModel.Diagnostics;
using System.Threading;
using System.Workflow.Runtime;
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics;
class WorkflowInstanceContextProvider : DurableInstanceContextProvider
{
bool hasCheckedForExtension;
WorkflowInstanceLifetimeManagerExtension instanceLifeTimeManager;
ServiceHostBase serviceHostBase;
WaitCallback workflowActivationCompleteCallback;
WorkflowDefinitionContext workflowDefinitionContext;
public WorkflowInstanceContextProvider(ServiceHostBase serviceHostBase, bool isPerCall, WorkflowDefinitionContext workflowDefinitionContext)
: base(serviceHostBase, isPerCall)
{
if (workflowDefinitionContext == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("workflowDefinitionContext");
}
this.workflowDefinitionContext = workflowDefinitionContext;
this.serviceHostBase = serviceHostBase;
this.workflowActivationCompleteCallback = Fx.ThunkCallback(new WaitCallback(this.OnWorkflowActivationCompleted));
}
public WorkflowInstanceLifetimeManagerExtension InstanceLifeTimeManager
{
get
{
if (!hasCheckedForExtension)
{
this.instanceLifeTimeManager = this.serviceHostBase.Extensions.Find<WorkflowInstanceLifetimeManagerExtension>();
hasCheckedForExtension = true;
}
return this.instanceLifeTimeManager;
}
}
public override InstanceContext GetExistingInstanceContext(Message message, IContextChannel channel)
{
InstanceContext instanceContext = base.GetExistingInstanceContext(message, channel);
if (instanceContext != null && this.InstanceLifeTimeManager != null)
{
WorkflowDurableInstance workflowDurableInstance = instanceContext.Extensions.Find<WorkflowDurableInstance>();
if (workflowDurableInstance == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
new InvalidOperationException(
SR2.GetString(
SR2.RequiredInstanceContextExtensionNotFound,
typeof(WorkflowDurableInstance).Name)));
}
this.InstanceLifeTimeManager.NotifyWorkflowActivationComplete(
workflowDurableInstance.InstanceId,
this.workflowActivationCompleteCallback,
new WorkflowActivationCompletedCallbackState
(
workflowDurableInstance.InstanceId,
instanceContext),
false);
}
return instanceContext;
}
public override void InitializeInstanceContext(InstanceContext instanceContext, Message message, IContextChannel channel)
{
base.InitializeInstanceContext(instanceContext, message, channel);
WorkflowDurableInstance workflowDurableInstance = instanceContext.Extensions.Find<WorkflowDurableInstance>();
if (workflowDurableInstance == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
new InvalidOperationException(
SR2.GetString(
SR2.RequiredInstanceContextExtensionNotFound,
typeof(WorkflowDurableInstance).Name)));
}
if (this.InstanceLifeTimeManager != null)
{
this.InstanceLifeTimeManager.NotifyWorkflowActivationComplete(workflowDurableInstance.InstanceId,
this.workflowActivationCompleteCallback,
new WorkflowActivationCompletedCallbackState
(workflowDurableInstance.InstanceId, instanceContext),
false);
}
}
public override bool IsIdle(InstanceContext instanceContext)
{
if (instanceContext == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("instanceContext");
}
WorkflowDurableInstance workflowDurableInstance = instanceContext.Extensions.Find<WorkflowDurableInstance>();
if (workflowDurableInstance == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
new InvalidOperationException(
SR2.GetString(
SR2.RequiredInstanceContextExtensionNotFound,
typeof(WorkflowDurableInstance).Name)));
}
if (this.InstanceLifeTimeManager != null)
{
return (!this.InstanceLifeTimeManager.IsInstanceInMemory(workflowDurableInstance.InstanceId)) &&
base.IsIdle(instanceContext);
}
return base.IsIdle(instanceContext);
}
public override void NotifyIdle(InstanceContextIdleCallback callback, InstanceContext instanceContext)
{
WorkflowDurableInstance workflowDurableInstance = instanceContext.Extensions.Find<WorkflowDurableInstance>();
if (workflowDurableInstance == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
new InvalidOperationException(
SR2.GetString(
SR2.RequiredInstanceContextExtensionNotFound,
typeof(WorkflowDurableInstance).Name)));
}
if (this.InstanceLifeTimeManager != null)
{
if (this.InstanceLifeTimeManager.IsInstanceInMemory(workflowDurableInstance.InstanceId))
{
this.InstanceLifeTimeManager.NotifyWorkflowActivationComplete(workflowDurableInstance.InstanceId,
Fx.ThunkCallback(new WaitCallback(this.OnWorkflowActivationCompleted)),
new WorkflowActivationCompletedCallbackState
(
workflowDurableInstance.InstanceId,
instanceContext,
callback),
true);
}
else
{
if (base.IsIdle(instanceContext))
{
callback(instanceContext);
}
else
{
base.NotifyIdle(callback, instanceContext);
}
}
}
else
{
base.NotifyIdle(callback, instanceContext);
}
}
protected override DurableInstance OnCreateNewInstance(Guid instanceId)
{
if (DiagnosticUtility.ShouldTraceInformation)
{
string traceText = SR2.GetString(SR2.InstanceContextProviderCreatedNewInstance, "Workflow", instanceId);
TraceUtility.TraceEvent(TraceEventType.Information,
TraceCode.ActivatingMessageReceived, SR.GetString(SR.TraceCodeActivatingMessageReceived),
new StringTraceRecord("NewInstanceDetail", traceText),
this, null);
}
return new WorkflowDurableInstance(this, instanceId, this.workflowDefinitionContext, true);
}
protected override DurableInstance OnGetExistingInstance(Guid instanceId)
{
return new WorkflowDurableInstance(this, instanceId, this.workflowDefinitionContext, false);
}
void OnWorkflowActivationCompleted(object state)
{
WorkflowActivationCompletedCallbackState callbackState = (WorkflowActivationCompletedCallbackState) state;
lock (callbackState.InstanceContext.ThisLock)
{
if (base.Cache.Contains(callbackState.InstanceId, callbackState.InstanceContext))
{
WorkflowDurableInstance durableInstance = callbackState.InstanceContext.Extensions.Find<WorkflowDurableInstance>();
if (durableInstance != null
&& durableInstance.CurrentOperationInvocation != null
&& durableInstance.CurrentOperationInvocation.HasWorkflowRequestContextBeenSerialized
&& !durableInstance.CurrentOperationInvocation.IsCompleted)
{
// If we are here, it means the workflow instance completed, terminated, or otherwise unloaded without
// completing the current operation invocation. In such case, we want to make the best effort to let
// service model to consider this operation invocation failed.
try
{
durableInstance.CurrentOperationInvocation.SendFault(
WorkflowOperationErrorHandler.CreateUnhandledException(
new InvalidOperationException(SR2.GetString(SR2.WorkflowServiceUnloadedWithoutSendingResponse))),
null);
}
catch (Exception e)
{
if (Fx.IsFatal(e))
{
throw;
}
}
}
IChannel[] incomingChannels = new IChannel[callbackState.InstanceContext.IncomingChannels.Count];
callbackState.InstanceContext.IncomingChannels.CopyTo(incomingChannels, 0);
if (callbackState.InstanceContext.IncomingChannels.Count != 0)
{
foreach (IChannel channel in incomingChannels)
{
callbackState.InstanceContext.IncomingChannels.Remove(channel);
}
}
else
{
//Call notify only when IncomingChannels Collection is empty.
if (callbackState.InstanceContextIdleCallback != null)
{
callbackState.InstanceContextIdleCallback(callbackState.InstanceContext);
}
}
}
}
}
class WorkflowActivationCompletedCallbackState
{
InstanceContext instanceContext;
InstanceContextIdleCallback instanceContextIdleCallback;
Guid instanceId;
public WorkflowActivationCompletedCallbackState(Guid instanceId, InstanceContext instanceContext)
: this(instanceId, instanceContext, null)
{
}
public WorkflowActivationCompletedCallbackState(Guid instanceId, InstanceContext instanceContext, InstanceContextIdleCallback callback)
{
this.instanceId = instanceId;
this.instanceContext = instanceContext;
this.instanceContextIdleCallback = callback;
}
public InstanceContext InstanceContext
{
get
{
return this.instanceContext;
}
}
public InstanceContextIdleCallback InstanceContextIdleCallback
{
get
{
return this.instanceContextIdleCallback;
}
}
public Guid InstanceId
{
get
{
return this.instanceId;
}
}
}
}
}
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