private static ClassDeclarationSyntax GenerateWriteGrain(ClassDeclarationSyntax grainClass, ITypeSymbol swmrInterface, int readReplicaCount)
{
string grainName = grainClass.Identifier.Text;
string writerGrainName = SwmrUtils.GetWriteInterfaceName(grainName);
string writerInterfaceName = SwmrUtils.GetWriteInterfaceName(swmrInterface.Name);
ClassDeclarationSyntax writerGrain = GenerateClassSqueleton(writerGrainName).WithBaseList(RoslynUtils.BaseList(new[] { "Grain", writerInterfaceName }));
writerGrain = RoslynUtils.AddField(writerGrain, "ITopology<string>", "_topology");
writerGrain = writerGrain.AddMembers(GenerateOnActivateAsyncMethod(readReplicaCount));
string readReplicaInterfaceName = SwmrUtils.GetReadReplicaInterfaceName(swmrInterface.Name);
foreach (ISymbol member in swmrInterface.GetMembers())
{
IMethodSymbol methodSymbol = member as IMethodSymbol;
if (methodSymbol == null || IsReadOnlyMethod(methodSymbol) || new MethodInspector(methodSymbol).MethodName == "GetState")
{
continue;
}
MethodInspector methodInspector = new MethodInspector(methodSymbol);
MethodDeclarationSyntax methodImpl = GenerateMethodDeclaration(methodInspector);
methodImpl = SwmrUtils.AddSessionIdParameter(methodImpl).AddModifiers(SF.Token(SyntaxKind.PublicKeyword), SF.Token(SyntaxKind.AsyncKeyword)).WithSemicolonToken(SF.Token(SyntaxKind.None));
BlockSyntax statmentBlock = SF.Block();
statmentBlock = AddStatement(statmentBlock, "string grainId = this.GetPrimaryKeyString();");
statmentBlock = AddStatement(statmentBlock, string.Format("{0} grain = GrainFactory.GetGrain<{0}>(grainId);", swmrInterface.Name));
statmentBlock = AddStatement(statmentBlock, String.Format("{0} await grain.{1}({2});", methodInspector.ReturnType != "Task"? "var result =" : "", methodInspector.MethodName, string.Join(", ", methodInspector.MethodParams.Keys)));
statmentBlock = AddStatement(statmentBlock, "GrainState state = await grain.GetState();");
statmentBlock = AddStatement(statmentBlock, "string sessionNode = _topology.GetNode(sessionId);");
statmentBlock = AddStatement(statmentBlock, "IEnumerable<string> otherNodes = _topology.Nodes.Where(node => node != sessionNode);");
ForEachStatementSyntax forEachStatement = SF.ForEachStatement(
SF.PredefinedType(SF.Token(SyntaxKind.StringKeyword)),
SF.Identifier("node"),
SF.IdentifierName("otherNodes"),
SF.Block(SF.ParseStatement(GenerateSetStateStmt(readReplicaInterfaceName, @"node")))
);
statmentBlock = statmentBlock.AddStatements(forEachStatement);
statmentBlock =
AddStatement(statmentBlock, (string.Format("{0} {1}", "await",
GenerateSetStateStmt(readReplicaInterfaceName, @"sessionNode"))));
if (methodInspector.ReturnType != "Task")
{
statmentBlock = AddStatement(statmentBlock, "return result;");
}
methodImpl = methodImpl.WithBody(statmentBlock);
writerGrain = writerGrain.AddMembers(methodImpl);
}
return(writerGrain);
}
private static ClassDeclarationSyntax GenerateReadGrain(ClassDeclarationSyntax grainClass, ITypeSymbol swmrInterface, int readReplicaCount)
{
string readGrainName = SwmrUtils.GetReadInterfaceName(grainClass.Identifier.Text);
string readerInterfaceName = SwmrUtils.GetReadInterfaceName(swmrInterface.Name);
ClassDeclarationSyntax readGrain = GenerateClassSqueleton(readGrainName).WithAttributeLists(AttributeUtils.AttributeListList(AttributeUtils.Attribute(StatelessWorkerAttributeName))).WithBaseList(RoslynUtils.BaseList(new[] { "Grain", readerInterfaceName }));
readGrain = RoslynUtils.AddField(readGrain, "ITopology<string>", "_topology");
readGrain = readGrain.AddMembers(GenerateOnActivateAsyncMethod(readReplicaCount));
string readReplicaInterfaceName = SwmrUtils.GetReadReplicaInterfaceName(swmrInterface.Name);
foreach (ISymbol member in swmrInterface.GetMembers())
{
IMethodSymbol methodSymbol = member as IMethodSymbol;
if (methodSymbol == null || !IsReadOnlyMethod(methodSymbol))
{
continue;
}
MethodInspector methodInspector = new MethodInspector(methodSymbol);
string parameters = "string sessionId";
if (methodInspector.MethodParams.Any())
{
parameters = string.Join(", ", methodInspector.MethodParams.Select(param => string.Format("{0} {1}", param.Value, param.Key))) + " ," + parameters;
}
var method = RoslynUtils.ParseMethod(string.Format(
@"
public {0} {1}({2})
{{
string sessionNode = _topology.GetNode(sessionId);
var readReplica = GrainFactory.GetGrain<{3}>(sessionNode);
return readReplica.{1}({4});
}}", methodInspector.ReturnType, methodInspector.MethodName, parameters, readReplicaInterfaceName, string.Join(", ", methodInspector.MethodParams.Keys)));
readGrain =
readGrain.AddMembers(
method.WithLeadingTrivia(SF.EndOfLine("")));
}
return(readGrain);
}
private static ClassDeclarationSyntax GenerateApiControllerForInterface(InterfaceDeclarationSyntax interfaceNode, SemanticModel semanticModel)
{
if (!RoslynUtils.IsPublic(interfaceNode))
{
return(null);
}
AttributeSyntax apiControllerAttribute = AttributeUtils.SelectAttributeOfType(interfaceNode.AttributeLists, typeof(ApiControllerAttribute), semanticModel);
// if the interface is not annotated with the ApiController attribute, do nothing
if (apiControllerAttribute == null)
{
return(null);
}
var namespaceNode = interfaceNode.Parent as NamespaceDeclarationSyntax;
if (namespaceNode == null)
{
throw new Exception("A grain interface must be declared inside a namespace");
}
// copy all attributes except the ApiController attribute
SyntaxList <AttributeListSyntax> attributesLists = AttributeUtils.RemoveAttributeOfType(interfaceNode.AttributeLists, typeof(ApiControllerAttribute), semanticModel);
// add the RoutePrefix attribute (if any)
var attributeInspector = new AttributeInspector(apiControllerAttribute, semanticModel);
if (attributeInspector.NamedArguments.ContainsKey(RoutePrefix))
{
AttributeSyntax routePrefixAttribute = AttributeUtils.AttributeWithArgument(RoutePrefix,
attributeInspector.NamedArguments[RoutePrefix]);
attributesLists = attributesLists.Add(AttributeUtils.AttributeList(routePrefixAttribute));
}
string grainName = interfaceNode.Identifier.Text;
string apiControllerName = GetApiControllerName(grainName);
// create the Api controller class, add the attributes to it and make it a subclass of ApiController
ClassDeclarationSyntax classDclr =
SF.ClassDeclaration(SF.Identifier(apiControllerName)).AddModifiers(SF.Token(SyntaxKind.PublicKeyword), SF.Token(SyntaxKind.PartialKeyword)).WithAttributeLists(SF.List(attributesLists)).WithBaseList(SF.BaseList(SF.SeparatedList <BaseTypeSyntax>().Add(SF.SimpleBaseType(SF.IdentifierName(ApicontrollerClassName)))));
// Add the IGrainFactory field and to the constructor
classDclr = RoslynUtils.AddField(classDclr, "IGrainFactory", "_grainFactory");
MethodDeclarationSyntax constructor = RoslynUtils.ParseMethod(string.Format(@"
public {0}(IGrainFactory grainFactory)
{{
_grainFactory = grainFactory;
}}", apiControllerName)).WithTrailingTrivia(SF.EndOfLine(""));
classDclr = classDclr.AddMembers(constructor);
// generate the api controller methods and add them to the class
IEnumerable <MethodDeclarationSyntax> apiControllerMethods = GenerateApiControllerMethods(RoslynUtils.GetMethodDeclarations(interfaceNode), grainName);
// ReSharper disable once LoopCanBeConvertedToQuery
foreach (var method in apiControllerMethods)
{
classDclr = classDclr.AddMembers(method);
}
return(classDclr);
}