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//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------
namespace System.Activities.Debugger
{
using System;
using System.Activities.Hosting;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Linq.Expressions;
using System.Runtime;
using System.Activities.Validation;
// DebugController, one is needed per ActivityExecutor.
[DebuggerNonUserCode]
class DebugController
{
WorkflowInstance host;
DebugManager debugManager; // Instantiated after first instrumentation is successful.
public DebugController(WorkflowInstance host)
{
this.host = host;
}
public void WorkflowStarted()
{
}
public void WorkflowCompleted()
{
if (this.debugManager != null)
{
this.debugManager.Exit();
this.debugManager = null;
}
}
public void ActivityStarted(ActivityInstance activityInstance)
{
if (!(activityInstance.Activity.RootActivity is Constraint)) // Don't debug an activity in a Constraint
{
EnsureActivityInstrumented(activityInstance, false);
this.debugManager.OnEnterState(activityInstance);
}
}
public void ActivityCompleted(ActivityInstance activityInstance)
{
if (!(activityInstance.Activity.RootActivity is Constraint)) // Don't debug an activity in a Constraint
{
EnsureActivityInstrumented(activityInstance, true);
this.debugManager.OnLeaveState(activityInstance);
}
}
// Lazy instrumentation.
// Parameter primeCurrentInstance specify whether priming (if needed) is done
// up to the current instance. Set this to true when calling this from an "...Completed"
// (exit state).
void EnsureActivityInstrumented(ActivityInstance instance, bool primeCurrentInstance)
{
if (this.debugManager == null)
{ // Workflow has not been instrumented yet.
// Finding rootInstance and check all referred sources.
Stack<ActivityInstance> ancestors = new Stack<ActivityInstance>();
while (instance.Parent != null)
{
ancestors.Push(instance);
instance = instance.Parent;
}
Activity rootActivity = instance.Activity;
// Do breakOnStartup only if debugger is attached from the beginning, i.e. no priming needed.
// This specified by change the last parameter below to: "(ancestors.Count == 0)".
this.debugManager = new DebugManager(rootActivity, "Workflow", "Workflow", "DebuggerThread", false, this.host, ancestors.Count == 0);
if (ancestors.Count > 0)
{
// Priming the background thread
this.debugManager.IsPriming = true;
while (ancestors.Count > 0)
{
ActivityInstance ancestorInstance = ancestors.Pop();
this.debugManager.OnEnterState(ancestorInstance);
}
if (primeCurrentInstance)
{
this.debugManager.OnEnterState(instance);
}
this.debugManager.IsPriming = false;
}
}
}
}
}
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