Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Statements / TransactionScope.cs / 1305376 / TransactionScope.cs
//------------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities.Statements
{
using System;
using System.Activities;
using System.Activities.Validation;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime;
using System.Transactions;
using System.Windows.Markup;
using System.Activities.Expressions;
using System.Collections.ObjectModel;
[ContentProperty("Body")]
public sealed class TransactionScope : NativeActivity
{
const IsolationLevel defaultIsolationLevel = default(IsolationLevel);
InArgument timeout;
bool isTimeoutSetExplicitly;
Variable runtimeTransactionHandle;
bool abortInstanceOnTransactionFailure;
bool abortInstanceFlagWasExplicitlySet;
Delay nestedScopeTimeoutWorkflow;
Variable delayWasScheduled;
Variable nestedScopeTimeout;
Variable nestedScopeTimeoutActivityInstance;
static string runtimeTransactionHandlePropertyName = typeof(RuntimeTransactionHandle).FullName;
const string AbortInstanceOnTransactionFailurePropertyName = "AbortInstanceOnTransactionFailure";
const string IsolationLevelPropertyName = "IsolationLevel";
const string BodyPropertyName = "Body";
public TransactionScope()
: base()
{
this.timeout = new InArgument(TimeSpan.FromMinutes(1));
this.runtimeTransactionHandle = new Variable();
this.abortInstanceOnTransactionFailure = true;
this.nestedScopeTimeout = new Variable();
this.delayWasScheduled = new Variable();
this.nestedScopeTimeoutActivityInstance = new Variable();
base.Constraints.Add(ProcessParentChainConstraints());
base.Constraints.Add(ProcessChildSubtreeConstraints());
}
[DefaultValue(null)]
public Activity Body
{
get;
set;
}
[DefaultValue(true)]
public bool AbortInstanceOnTransactionFailure
{
get
{
return this.abortInstanceOnTransactionFailure;
}
set
{
this.abortInstanceOnTransactionFailure = value;
this.abortInstanceFlagWasExplicitlySet = true;
}
}
public IsolationLevel IsolationLevel
{
get;
set;
}
public InArgument Timeout
{
get
{
return this.timeout;
}
set
{
this.timeout = value;
this.isTimeoutSetExplicitly = true;
}
}
Delay NestedScopeTimeoutWorkflow
{
get
{
if (this.nestedScopeTimeoutWorkflow == null)
{
this.nestedScopeTimeoutWorkflow = new Delay
{
Duration = new InArgument(this.nestedScopeTimeout)
};
}
return this.nestedScopeTimeoutWorkflow;
}
}
protected override bool CanInduceIdle
{
get
{
return true;
}
}
[EditorBrowsable(EditorBrowsableState.Never)]
public bool ShouldSerializeIsolationLevel()
{
return this.IsolationLevel != defaultIsolationLevel;
}
[EditorBrowsable(EditorBrowsableState.Never)]
public bool ShouldSerializeTimeout()
{
return this.isTimeoutSetExplicitly;
}
protected override void CacheMetadata(NativeActivityMetadata metadata)
{
RuntimeArgument timeoutArgument = new RuntimeArgument("Timeout", typeof(TimeSpan), ArgumentDirection.In,false);
metadata.Bind(this.Timeout, timeoutArgument);
metadata.SetArgumentsCollection(new Collection { timeoutArgument });
metadata.AddImplementationChild(this.NestedScopeTimeoutWorkflow);
if (this.Body != null)
{
metadata.AddChild(this.Body);
}
metadata.AddImplementationVariable(this.runtimeTransactionHandle);
metadata.AddImplementationVariable(this.nestedScopeTimeout);
metadata.AddImplementationVariable(this.delayWasScheduled);
metadata.AddImplementationVariable(this.nestedScopeTimeoutActivityInstance);
}
Constraint ProcessParentChainConstraints()
{
DelegateInArgument element = new DelegateInArgument { Name = "element" };
DelegateInArgument validationContext = new DelegateInArgument { Name = "validationContext" };
DelegateInArgument parent = new DelegateInArgument { Name = "parent" };
return new Constraint
{
Body = new ActivityAction
{
Argument1 = element,
Argument2 = validationContext,
Handler = new Sequence
{
Activities =
{
new ForEach
{
Values = new GetParentChain
{
ValidationContext = validationContext,
},
Body = new ActivityAction
{
Argument = parent,
Handler = new Sequence
{
Activities =
{
new If()
{
Condition = new Equal
{
Left = new ObtainType
{
Input = parent,
},
Right = new InArgument(context => typeof(TransactionScope))
},
Then = new Sequence
{
Activities =
{
new AssertValidation
{
IsWarning = true,
Assertion = new AbortInstanceFlagValidator
{
ParentActivity = parent,
TransactionScope = new InArgument(context => element.Get(context))
},
Message = new InArgument(SR.AbortInstanceOnTransactionFailureDoesNotMatch),
PropertyName = AbortInstanceOnTransactionFailurePropertyName
},
new AssertValidation
{
Assertion = new IsolationLevelValidator
{
ParentActivity = parent,
CurrentIsolationLevel = new InArgument(context => element.Get(context).IsolationLevel)
},
Message = new InArgument(SR.IsolationLevelValidation),
PropertyName = IsolationLevelPropertyName
}
}
}
}
}
}
}
}
}
}
}
};
}
Constraint ProcessChildSubtreeConstraints()
{
DelegateInArgument element = new DelegateInArgument { Name = "element" };
DelegateInArgument validationContext = new DelegateInArgument { Name = "validationContext" };
DelegateInArgument child = new DelegateInArgument { Name = "child" };
Variable nestedCompensableActivity = new Variable();
return new Constraint
{
Body = new ActivityAction
{
Argument1 = element,
Argument2 = validationContext,
Handler = new Sequence
{
Variables = { nestedCompensableActivity },
Activities =
{
new ForEach
{
Values = new GetChildSubtree
{
ValidationContext = validationContext,
},
Body = new ActivityAction
{
Argument = child,
Handler = new Sequence
{
Activities =
{
new If()
{
Condition = new Equal()
{
Left = new ObtainType
{
Input = new InArgument(child)
},
Right = new InArgument(context => typeof(CompensableActivity))
},
Then = new Assign
{
To = new OutArgument(nestedCompensableActivity),
Value = new InArgument(true)
}
}
}
}
}
},
new AssertValidation()
{
Assertion = new InArgument(new Not { Operand = new VariableValue { Variable = nestedCompensableActivity }}),
Message = new InArgument(SR.CompensableActivityInsideTransactionScopeActivity),
PropertyName = BodyPropertyName
}
}
}
}
};
}
protected override void Execute(NativeActivityContext context)
{
RuntimeTransactionHandle transactionHandle = this.runtimeTransactionHandle.Get(context);
Fx.Assert(transactionHandle != null, "RuntimeTransactionHandle is null");
RuntimeTransactionHandle foundHandle = context.Properties.Find(runtimeTransactionHandlePropertyName) as RuntimeTransactionHandle;
if (foundHandle == null)
{
//Note, once the property is registered, we cannot change the state of this flag
transactionHandle.AbortInstanceOnTransactionFailure = this.AbortInstanceOnTransactionFailure;
context.Properties.Add(transactionHandle.ExecutionPropertyName, transactionHandle);
}
else
{
//nested case
//foundHandle.IsRuntimeOwnedTransaction will be true only in the Invoke case within an ambient Sys.Tx transaction.
//If this TSA is nested inside the ambient transaction from Invoke, then the AbortInstanceFlag is always false since the RTH corresponding to the ambient
//transaction has this flag as false. In this case, we ignore if this TSA has this flag explicitly set to true.
if(!foundHandle.IsRuntimeOwnedTransaction && this.abortInstanceFlagWasExplicitlySet && (foundHandle.AbortInstanceOnTransactionFailure != this.AbortInstanceOnTransactionFailure))
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.AbortInstanceOnTransactionFailureDoesNotMatch));
}
if (foundHandle.SuppressTransaction)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.CannotNestTransactionScopeWhenAmbientHandleIsSuppressed(this.DisplayName)));
}
transactionHandle = foundHandle;
}
Transaction transaction = transactionHandle.GetCurrentTransaction(context);
//Check if there is already a transaction (Requires Semantics)
if (transaction == null)
{
//If not, request one..
transactionHandle.RequestTransactionContext(context, OnContextAcquired, null);
}
else
{
//Most likely, you are inside a nested TSA
if (transaction.IsolationLevel != this.IsolationLevel)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.IsolationLevelValidation));
}
//Check if the nested TSA had a timeout specified explicitly
if (this.isTimeoutSetExplicitly)
{
TimeSpan timeout = this.Timeout.Get(context);
this.delayWasScheduled.Set(context, true);
this.nestedScopeTimeout.Set(context, timeout);
this.nestedScopeTimeoutActivityInstance.Set(context, context.ScheduleActivity(this.NestedScopeTimeoutWorkflow, new CompletionCallback(OnDelayCompletion)));
}
//execute the Body under the current runtime transaction
ScheduleBody(context);
}
}
void OnContextAcquired(NativeActivityTransactionContext context, object state)
{
Fx.Assert(context != null, "ActivityTransactionContext was null");
TimeSpan transactionTimeout = this.Timeout.Get(context);
TransactionOptions transactionOptions = new TransactionOptions()
{
IsolationLevel = this.IsolationLevel,
Timeout = transactionTimeout
};
context.SetRuntimeTransaction(new CommittableTransaction(transactionOptions));
ScheduleBody(context);
}
void ScheduleBody(NativeActivityContext context)
{
if (this.Body != null)
{
context.ScheduleActivity(this.Body,new CompletionCallback(OnCompletion));
}
}
void OnCompletion(NativeActivityContext context, ActivityInstance instance)
{
RuntimeTransactionHandle transactionHandle = this.runtimeTransactionHandle.Get(context);
Fx.Assert(transactionHandle != null, "RuntimeTransactionHandle is null");
if (this.delayWasScheduled.Get(context))
{
transactionHandle.CompleteTransaction(context, new BookmarkCallback(OnTransactionComplete));
}
else
{
transactionHandle.CompleteTransaction(context);
}
}
void OnDelayCompletion(NativeActivityContext context, ActivityInstance instance)
{
if (instance.State == ActivityInstanceState.Closed)
{
RuntimeTransactionHandle handle = context.Properties.Find(runtimeTransactionHandlePropertyName) as RuntimeTransactionHandle;
Fx.Assert(handle != null, "Internal error.. If we are here, there ought to be an ambient transaction handle");
handle.GetCurrentTransaction(context).Rollback();
}
}
void OnTransactionComplete(NativeActivityContext context, Bookmark bookmark, object state)
{
Fx.Assert(this.delayWasScheduled.Get(context), "Internal error..Delay should have been scheduled if we are here");
ActivityInstance delayActivityInstance = this.nestedScopeTimeoutActivityInstance.Get(context);
if (delayActivityInstance != null)
{
context.CancelChild(delayActivityInstance);
}
}
//
class ObtainType : CodeActivity
{
public ObtainType()
{
}
public InArgument Input
{
get;
set;
}
protected override Type Execute(CodeActivityContext context)
{
return this.Input.Get(context).GetType();
}
}
class IsolationLevelValidator : CodeActivity
{
public InArgument ParentActivity
{
get;
set;
}
public InArgument CurrentIsolationLevel
{
get;
set;
}
protected override bool Execute(CodeActivityContext context)
{
Activity parent = this.ParentActivity.Get(context);
if (parent != null)
{
TransactionScope transactionScope = parent as TransactionScope;
Fx.Assert(transactionScope != null, "ParentActivity was not of expected type");
if (transactionScope.IsolationLevel != this.CurrentIsolationLevel.Get(context))
{
return false;
}
else
{
return true;
}
}
else
{
return true;
}
}
}
class AbortInstanceFlagValidator : CodeActivity
{
public InArgument ParentActivity
{
get;
set;
}
public InArgument TransactionScope
{
get;
set;
}
protected override bool Execute(CodeActivityContext context)
{
Activity parent = this.ParentActivity.Get(context);
if (parent != null)
{
TransactionScope parentTransactionScope = parent as TransactionScope;
Fx.Assert(parentTransactionScope != null, "ParentActivity was not of expected type");
TransactionScope currentTransactionScope = this.TransactionScope.Get(context);
if (parentTransactionScope.AbortInstanceOnTransactionFailure != currentTransactionScope.AbortInstanceOnTransactionFailure)
{
//If the Inner TSA was default and still different from outer, we dont flag validation warning. See design spec for all variations
if (!currentTransactionScope.abortInstanceFlagWasExplicitlySet)
{
return true;
}
else
{
return false;
}
}
else
{
return true;
}
}
else
{
return true;
}
}
}
}
}
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