Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/CodeActivity.cs

@@ -0,0 +1,219 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Activities
+{
+    using System.Activities.DynamicUpdate;
+    using System.Activities.Runtime;
+    using System.Activities.Validation;
+    using System.Collections.Generic;
+    using System.Runtime;
+    using System.Runtime.Serialization;
+    
+    public abstract class CodeActivity : Activity
+    {
+        protected CodeActivity()
+        {
+        }
+
+        protected internal sealed override Version ImplementationVersion
+        {
+            get
+            {
+                return null;
+            }
+            set
+            {
+                if (value != null)
+                {
+                    throw FxTrace.Exception.AsError(new NotSupportedException());
+                }
+            }
+        }
+
+        [IgnoreDataMember]
+        [Fx.Tag.KnownXamlExternal]
+        protected sealed override Func<Activity> Implementation
+        {
+            get
+            {
+                return null;
+            }
+            set
+            {
+                if (value != null)
+                {
+                    throw FxTrace.Exception.AsError(new NotSupportedException());
+                }
+            }
+        }
+
+        protected abstract void Execute(CodeActivityContext context);
+
+        sealed internal override void InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
+        {
+            CodeActivityContext context = executor.CodeActivityContextPool.Acquire();
+            try
+            {
+                context.Initialize(instance, executor);
+                Execute(context);
+            }
+            finally
+            {
+                context.Dispose();
+                executor.CodeActivityContextPool.Release(context);
+            }
+        }
+
+        sealed internal override void InternalCancel(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
+        {
+            Fx.Assert("Cancel should never be called on CodeActivity since it's synchronous");
+        }
+
+        sealed internal override void InternalAbort(ActivityInstance instance, ActivityExecutor executor, Exception terminationReason)
+        {
+            // no-op, this is only called if an exception is thrown out of execute
+        }
+
+        sealed internal override void OnInternalCacheMetadata(bool createEmptyBindings)
+        {
+            CodeActivityMetadata metadata = new CodeActivityMetadata(this, this.GetParentEnvironment(), createEmptyBindings);
+            CacheMetadata(metadata);
+            metadata.Dispose(); 
+            if (this.RuntimeArguments == null || this.RuntimeArguments.Count == 0)
+            {
+                this.SkipArgumentResolution = true;
+            }
+        }
+
+        internal sealed override void OnInternalCreateDynamicUpdateMap(DynamicUpdateMapBuilder.Finalizer finalizer, 
+            DynamicUpdateMapBuilder.IDefinitionMatcher matcher, Activity originalActivity)
+        {
+        }
+
+        protected sealed override void OnCreateDynamicUpdateMap(UpdateMapMetadata metadata, Activity originalActivity)
+        {
+            // NO OP
+        }
+
+        protected sealed override void CacheMetadata(ActivityMetadata metadata)
+        {
+            throw FxTrace.Exception.AsError(new InvalidOperationException(SR.WrongCacheMetadataForCodeActivity));
+        }
+
+        protected virtual void CacheMetadata(CodeActivityMetadata metadata)
+        {
+            // We bypass the metadata call to avoid the null checks
+            SetArgumentsCollection(ReflectedInformation.GetArguments(this), metadata.CreateEmptyBindings);
+        }
+    }
+
+    public abstract class CodeActivity<TResult> : Activity<TResult>
+    {
+        protected CodeActivity()
+        {
+        }
+
+        protected internal sealed override Version ImplementationVersion
+        {
+            get
+            {
+                return null;
+            }
+            set
+            {
+                if (value != null)
+                {
+                    throw FxTrace.Exception.AsError(new NotSupportedException());
+                }
+            }
+        }
+
+        [IgnoreDataMember]
+        [Fx.Tag.KnownXamlExternal]
+        protected sealed override Func<Activity> Implementation
+        {
+            get
+            {
+                return null;
+            }
+            set
+            {
+                if (value != null)
+                {
+                    throw FxTrace.Exception.AsError(new NotSupportedException());
+                }
+            }
+        }
+
+        protected abstract TResult Execute(CodeActivityContext context);
+
+        sealed internal override void InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
+        {
+            CodeActivityContext context = executor.CodeActivityContextPool.Acquire();
+            try
+            {
+                context.Initialize(instance, executor);
+                TResult executeResult = Execute(context);
+                this.Result.Set(context, executeResult);
+            }
+            finally
+            {
+                context.Dispose();
+                executor.CodeActivityContextPool.Release(context);
+            }
+        }
+
+        sealed internal override void InternalCancel(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
+        {
+            Fx.Assert("Cancel should never be called on CodeActivity<T> since it's synchronous");
+        }
+
+        sealed internal override void InternalAbort(ActivityInstance instance, ActivityExecutor executor, Exception terminationReason)
+        {
+            // no-op, this is only called if an exception is thrown out of execute
+        }
+
+        sealed internal override void OnInternalCacheMetadataExceptResult(bool createEmptyBindings)
+        {
+            CodeActivityMetadata metadata = new CodeActivityMetadata(this, this.GetParentEnvironment(), createEmptyBindings);
+            CacheMetadata(metadata);
+            metadata.Dispose();
+            if (this.RuntimeArguments == null || this.RuntimeArguments.Count == 0 ||
+                // If there's an argument named "Result", we can safely assume it's the actual result
+                // argument, because Activity<T> will raise a validation error if it's not.
+                (this.RuntimeArguments.Count == 1 && this.RuntimeArguments[0].Name == Argument.ResultValue))
+            {
+                this.SkipArgumentResolution = true;
+            }
+        }
+
+        sealed internal override TResult InternalExecuteInResolutionContext(CodeActivityContext context)
+        {
+             Fx.Assert(this.SkipArgumentResolution, "This method should only be called if SkipArgumentResolution is true");
+            return Execute(context);
+        }
+
+        internal sealed override void OnInternalCreateDynamicUpdateMap(DynamicUpdateMapBuilder.Finalizer finalizer,
+            DynamicUpdateMapBuilder.IDefinitionMatcher matcher, Activity originalActivity)
+        {
+        }
+
+        protected sealed override void OnCreateDynamicUpdateMap(UpdateMapMetadata metadata, Activity originalActivity)
+        {
+            // NO OP
+        }
+
+        protected sealed override void CacheMetadata(ActivityMetadata metadata)
+        {
+            throw FxTrace.Exception.AsError(new InvalidOperationException(SR.WrongCacheMetadataForCodeActivity));
+        }
+
+        protected virtual void CacheMetadata(CodeActivityMetadata metadata)
+        {
+            // We bypass the metadata call to avoid the null checks
+            SetArgumentsCollection(ReflectedInformation.GetArguments(this), metadata.CreateEmptyBindings);
+        }
+    }
+}