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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities.Runtime
{
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Runtime;
[DataContract]
class ResolveNextArgumentWorkItem : ActivityExecutionWorkItem
{
int nextArgumentIndex;
IDictionary<string, object> argumentValueOverrides;
Location resultLocation;
public ResolveNextArgumentWorkItem()
{
this.IsPooled = true;
}
[DataMember(EmitDefaultValue = false, Name = "nextArgumentIndex")]
internal int SerializedNextArgumentIndex
{
get { return this.nextArgumentIndex; }
set { this.nextArgumentIndex = value; }
}
[DataMember(EmitDefaultValue = false, Name = "argumentValueOverrides")]
internal IDictionary<string, object> SerializedArgumentValueOverrides
{
get { return this.argumentValueOverrides; }
set { this.argumentValueOverrides = value; }
}
[DataMember(EmitDefaultValue = false, Name = "resultLocation")]
internal Location SerializedResultLocation
{
get { return this.resultLocation; }
set { this.resultLocation = value; }
}
public override void TraceScheduled()
{
TraceRuntimeWorkItemScheduled();
}
public override void TraceStarting()
{
TraceRuntimeWorkItemStarting();
}
public override void TraceCompleted()
{
TraceRuntimeWorkItemCompleted();
}
public void Initialize(ActivityInstance activityInstance, int nextArgumentIndex, IDictionary<string, object> argumentValueOverrides, Location resultLocation)
{
Fx.Assert(nextArgumentIndex > 0, "The nextArgumentIndex must be greater than 0 otherwise we will incorrectly set the sub-state when ResolveArguments completes");
base.Reinitialize(activityInstance);
this.nextArgumentIndex = nextArgumentIndex;
this.argumentValueOverrides = argumentValueOverrides;
this.resultLocation = resultLocation;
}
// Knowledge at a distance! This method relies on the fact that ResolveArguments will
// always schedule a separate work item for expressions that aren't OldFastPath.
internal bool CanExecuteUserCode()
{
Activity activity = this.ActivityInstance.Activity;
for (int i = this.nextArgumentIndex; i < activity.RuntimeArguments.Count; i++)
{
RuntimeArgument argument = activity.RuntimeArguments[i];
if (argument.IsBound && argument.BoundArgument.Expression != null)
{
return argument.BoundArgument.Expression.UseOldFastPath;
}
}
return false;
}
protected override void ReleaseToPool(ActivityExecutor executor)
{
base.ClearForReuse();
this.nextArgumentIndex = 0;
this.resultLocation = null;
this.argumentValueOverrides = null;
executor.ResolveNextArgumentWorkItemPool.Release(this);
}
public override bool Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)
{
this.ActivityInstance.ResolveArguments(executor, argumentValueOverrides, resultLocation, nextArgumentIndex);
// Return true always to prevent scheduler from yielding silently.
return true;
}
}
}
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