static MessageQuerySet BuildCorrelatesOn()
{
XPathMessageContext context = new XPathMessageContext();
return new MessageQuerySet()
{
{ "ch", new XPathMessageQuery("//ser:string", context) },
};
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
XPathMessageContext context = new XPathMessageContext();
foreach (KeyValuePair<string, string> pair in this.namespaces)
{
context.AddNamespace(pair.Key, pair.Value);
}
return context;
}
// A correlation is initialized in the first Receive activity based on an string identifier from the client.
// All following receives follow up on this same correlation key.
private static MessageQuerySet BuildCorrelatesOn()
{
XPathMessageContext context = new XPathMessageContext();
return new MessageQuerySet()
{
{ "CorrH", new XPathMessageQuery("sm:body()/ser:string", context) },
};
}
public XPathMessageContextMarkupExtension(XPathMessageContext context) : this()
{
foreach (string str in context)
{
if (!implicitPrefixes.Contains(str))
{
this.namespaces.Add(str, context.LookupNamespace(str));
}
}
}
public static MessageFilterTable<IEnumerable<ServiceEndpoint>> CreateFilterTable(string name)
{
if (string.IsNullOrEmpty(name))
{
throw FxTrace.Exception.ArgumentNullOrEmpty("name");
}
RoutingSection routingSection = (RoutingSection)ConfigurationManager.GetSection("system.serviceModel/routing");
if (routingSection == null)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR2.RoutingSectionNotFound));
}
FilterTableEntryCollection routingTableElement = routingSection.FilterTables[name];
if (routingTableElement == null)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR2.RoutingTableNotFound(name)));
}
XmlNamespaceManager xmlNamespaces = new XPathMessageContext();
foreach (NamespaceElement nsElement in routingSection.NamespaceTable)
{
xmlNamespaces.AddNamespace(nsElement.Prefix, nsElement.Namespace);
}
FilterElementCollection filterElements = routingSection.Filters;
MessageFilterTable<IEnumerable<ServiceEndpoint>> routingTable = new MessageFilterTable<IEnumerable<ServiceEndpoint>>();
foreach (FilterTableEntryElement entry in routingTableElement)
{
FilterElement filterElement = filterElements[entry.FilterName];
if (filterElement == null)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR2.FilterElementNotFound(entry.FilterName)));
}
MessageFilter filter = filterElement.CreateFilter(xmlNamespaces, filterElements);
//retreive alternate service endpoints
IList<ServiceEndpoint> endpoints = new List<ServiceEndpoint>();
if (!string.IsNullOrEmpty(entry.BackupList))
{
BackupEndpointCollection alternateEndpointListElement = routingSection.BackupLists[entry.BackupList];
if (alternateEndpointListElement == null)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR2.BackupListNotFound(entry.BackupList)));
}
endpoints = alternateEndpointListElement.CreateAlternateEndpoints();
}
//add first endpoint to beginning of list
endpoints.Insert(0, ClientEndpointLoader.LoadEndpoint(entry.EndpointName));
routingTable.Add(filter, endpoints, entry.Priority);
}
return routingTable;
}
public RoutingTable()
{
this.filterTable = new XPathMessageFilterTable<EndpointAddress>();
this.randomNumberGenerator = new Random();
XmlNamespaceManager manager = new XPathMessageContext();
XmlReader routingTableDataFileReader = XmlReader.Create(ConfigurationManager.AppSettings["routingTableXmlFile"]);
RoutingTableData routingTableData = (RoutingTableData)new XmlSerializer(typeof(RoutingTableData)).Deserialize(routingTableDataFileReader);
foreach (RouterNamespace ns in routingTableData.RouterNamespacesSection.RouterNamespaces)
{
manager.AddNamespace(ns.Prefix, ns.NamespaceUri);
}
foreach (Route route in routingTableData.RoutesSection.Routes)
{
this.filterTable.Add(new XPathMessageFilter(route.XPath, manager), new EndpointAddress(route.Uri));
}
}
private static void ConfigureRouterViaCode(ServiceHost serviceHost)
{
//This code sets up the Routing Sample via code. Rename the provided app.config
//to App.config.example and uncomment this method call to run a config-based Routing Service
//set up some communication defaults
//note that some of these are a little artifical for the purpose of demonstrating
//different filter types and how to define them
//the regular calculator service is located at net.tcp://localhost:9090/servicemodelsamples/service/
string calcDestinationAddress = "net.tcp://localhost:9090/servicemodelsamples/service/";
//the rounding calc service is located at net.tcp://localhost:8080/servicemodelsamples/service/
string roundingDestinationAddress = "net.tcp://localhost:8080/servicemodelsamples/service/";
//the "Default" router address
string routerAddress = "http://localhost/routingservice/router/general";
//the virtualized address of the regular calculator
string virtualCalculatorAddress = "http://localhost/routingservice/router/regular/calculator";
//the virtualized address of the rounding calculator
string virtualRoundingCalculatorAddress = "http://localhost/routingservice/router/rounding/calculator";
//set up the bindings for the Routing Service's communication with the client
Binding routerBinding = new WSHttpBinding();
//set up the bindings for the Routing Service's communication with the Calculator Services
Binding clientBinding = new NetTcpBinding();
//use the IRequestReplyRouter since the client and services are expecting request/response communication
ContractDescription contract = ContractDescription.GetContract(typeof(IRequestReplyRouter));
//set up the default Router endpoint
ServiceEndpoint routerEndpoint = new ServiceEndpoint(contract, routerBinding, new EndpointAddress(routerAddress));
routerEndpoint.Name = "routerEndpoint";
//create the virtual endpoint for the regular CalculatorSerivice
ServiceEndpoint calcEndpoint = new ServiceEndpoint(contract, routerBinding, new EndpointAddress(virtualCalculatorAddress));
calcEndpoint.Name = "calculatorEndpoint";
//create the virtual endpoint for the rounding CalculatorSerivice
ServiceEndpoint roundingEndpoint = new ServiceEndpoint(contract, routerBinding, new EndpointAddress(virtualRoundingCalculatorAddress));
roundingEndpoint.Name = "roundingEndpoint";
//add the inbound endpoints that the Routing Service will listen for
serviceHost.AddServiceEndpoint(routerEndpoint);
serviceHost.AddServiceEndpoint(calcEndpoint);
serviceHost.AddServiceEndpoint(roundingEndpoint);
//create the client endpoints the router will route messages to
ServiceEndpoint RegularCalcEndpoint = new ServiceEndpoint(contract, new NetTcpBinding(), new EndpointAddress(calcDestinationAddress));
ServiceEndpoint RoundingCalcEndpoint = new ServiceEndpoint(contract, new NetTcpBinding(), new EndpointAddress(roundingDestinationAddress));
//create the endpoint lists that contains the service endpoints we want to route to
List<ServiceEndpoint> RegularCalcs = new List<ServiceEndpoint>();
List<ServiceEndpoint> RoundingCalcs = new List<ServiceEndpoint>();
//add the endpoints in the order we want the Routing Service to try sending to them
RegularCalcs.Add(RegularCalcEndpoint);
RoundingCalcs.Add(RoundingCalcEndpoint);
//create the default RoutingConfiguration
RoutingConfiguration rc = new RoutingConfiguration();
//create all of the necessary filters
//create a new XPathMessageFilter that will look for the custom header
//Unfortunately, the default namespace manager doesn't have the custom namespace
// that we use defined so we have to define that prefix ourselves.
//Any message that shows up with this header will match this filter.
XPathMessageContext namespaceManager = new XPathMessageContext();
namespaceManager.AddNamespace("custom", "http://my.custom.namespace/");
XPathMessageFilter xpathFilter = new XPathMessageFilter("sm:header()/custom:RoundingCalculator = 1", namespaceManager);
//create a new Endpoint Name Message Filter, which will match any message that was received
//on the calculator Endpoint. The Endpoint name was defined when we created the service endpoint object
EndpointNameMessageFilter endpointNameFilter = new EndpointNameMessageFilter("calculatorEndpoint");
//Create a new Prefix Endpoint Address Message Filter. This will match any message that showed up on an endpoint
//with an address that matches the address -prefix- (or front portion) provided. In this example we define
//the address prefix as "http://localhost/routingservice/router/rounding/". This means that any messages that arrive
//addressed to http://localhost/routingservice/router/rounding/* will be matched by this filter. In this case, that
//will be messages that show up on the rounding calculator endpoint, which has the address of
//http://localhost/routingservice/router/rounding/calculator.
PrefixEndpointAddressMessageFilter prefixAddressFilter = new PrefixEndpointAddressMessageFilter(new EndpointAddress("http://localhost/routingservice/router/rounding/"));
//create two new Custom message filters. In this example, we're going to use a "RoundRobin" message filter
//this message filter is created in the provided RoundRobinMessageFilter.cs file. These filters, when set
//to the same group, will alternate between reporting that they match the message and that they don't, such that
//only one of them will respond true at a time.
RoundRobinMessageFilter roundRobinFilter1 = new RoundRobinMessageFilter("group1");
RoundRobinMessageFilter roundRobinFilter2 = new RoundRobinMessageFilter("group1");
//Now let's add all of those Message Filters to the Message Filter Table
//note the use of priorities to influence the order in which the MessageFilter Table
//executes the filters. The higher the priority, the sooner the filter will be
//executed, the lower the priority, the later a filter will be executed. Thus a filter
//at priority 2 runs before a filter at priority 1. The default priority level
//if one isn't specified is 0. A Message Filter Table executes all of the filters
//at a given priority level before moving to the next lowest priority level.
//If a match is found at a particular priority, then the Message Filter Table doesn't
//continue trying to find matches at the next lower priority.
//
//While this example shows how to use Message Filter priorities, in general it is
//more performant and better design to design and configure your filters such that they
//don't require prioritization in order to function correctly.
//The first filter we add is the XPath filter, and we set its priority to 2.
//Thus this will be the first MessageFilter that executes. If it finds the custom
//header, regardless of what the results of the other filters would be, the message
//will be routed to the Rounding Calculator endpoint.
//catch messages that showed up with the custom header
rc.FilterTable.Add(xpathFilter, RoundingCalcs, 2);
//At priority 1, we'll add two filters. These will only run if the xpath filter
//at priority 2 doesn't match the message. These two filters show two different ways to
//determine where the message was addressed when it showed up. Because they effectively check
//to see if the message arrived at one of the two endpoints, we can run them
//at the same priority level since they're never going to both return true.
//find messages that showed up addressed to the specific virtual endpoints
rc.FilterTable.Add(endpointNameFilter, RegularCalcs, 1);
rc.FilterTable.Add(prefixAddressFilter, RoundingCalcs, 1);
//Finally, run the RoundRobin message filters. Since we configured the filters
//with the same group name, only one of them will match at a time. Since we've already
//Routed all the messages with the custom header, and then those addressed to the specific
//virtualized endpoints, these will only be messages that showed up addressed to the
//default router endpoint without the custom header. Since these will switch based
//on a per message call, half of the operations will go to the regular calculator, and
//half will go to the Rounding calculator.
rc.FilterTable.Add(roundRobinFilter1, RegularCalcs, 0);
rc.FilterTable.Add(roundRobinFilter2, RoundingCalcs, 0);
//create the Routing Behavior with the Routing Configuration and add it to the
//serviceHost's Description.
serviceHost.Description.Behaviors.Add(new RoutingBehavior(rc));
}
void OnTypeSelectionChanged(object sender, RoutedEventArgs e)
{
var contentCorrelationDesigner = (ContentCorrelationTypeExpander)sender;
//is selection valid (valid type or property)
if (contentCorrelationDesigner.IsSelectionValid)
{
var path = contentCorrelationDesigner.GetMemberPath();
var type = contentCorrelationDesigner.GetSelectedType();
try
{
XmlNamespaceManager namespaceManager = null;
string xpathQuery = string.Empty;
var content = this.Activity.Properties["Content"].Value;
if (content.IsAssignableFrom<ReceiveMessageContent>() || content.IsAssignableFrom<SendMessageContent>())
{
//generating xpath for message content
xpathQuery = XPathQueryGenerator.CreateFromDataContractSerializer(type, path, out namespaceManager);
}
else
{
//generating xpath for parameter content
XName serviceContractName = null;
string operationName = null;
string parameterName = contentCorrelationDesigner.SelectedTypeEntry.Name;
bool isReply = this.Activity.IsAssignableFrom<SendReply>() || this.Activity.IsAssignableFrom<ReceiveReply>();
if (isReply)
{
operationName = (string)this.Activity.Properties["Request"].Value.Properties["OperationName"].ComputedValue;
serviceContractName = (XName)this.Activity.Properties["Request"].Value.Properties["ServiceContractName"].ComputedValue;
if (string.IsNullOrEmpty(operationName) || null == serviceContractName)
{
ModelItem requestDisplayName;
this.Activity.TryGetPropertyValue(out requestDisplayName, "Request", "DisplayName");
throw FxTrace.Exception.AsError(new InvalidOperationException(
string.Format(CultureInfo.CurrentUICulture, (string)this.FindResource("parametersRequiredText"), requestDisplayName.GetCurrentValue())));
}
}
else
{
operationName = (string)this.Activity.Properties["OperationName"].ComputedValue;
serviceContractName = (XName)this.Activity.Properties["ServiceContractName"].ComputedValue;
if (string.IsNullOrEmpty(operationName) || null == serviceContractName)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(
string.Format(CultureInfo.CurrentUICulture, (string)this.FindResource("parametersRequiredText"), this.Activity.Properties["DisplayName"].ComputedValue)));
}
}
xpathQuery = ParameterXPathQueryGenerator.CreateFromDataContractSerializer(serviceContractName, operationName, parameterName, isReply, type, path, out namespaceManager);
}
//use CDF api to build a xpath out of type and its properties
string xpath = string.Format(CultureInfo.InvariantCulture, "sm:body(){0}", xpathQuery);
//get the context
//We need to copy over the namespaces from the manager's table 1 by 1. According to MSDN:
//If you specify an existing name table, any namespaces in the name table are not automatically added to XmlNamespaceManager.
//You must use AddNamespace and RemoveNamespace to add or remove namespaces.
XPathMessageContext messageContext = new XPathMessageContext();
foreach (string prefix in namespaceManager)
{
if (!string.IsNullOrEmpty(prefix) && !messageContext.HasNamespace(prefix) && prefix != "xmlns")
{
messageContext.AddNamespace(prefix, namespaceManager.LookupNamespace(prefix));
}
}
var typeEntry = (ExpanderTypeEntry)contentCorrelationDesigner.Tag;
//construct xpath
XPathMessageQuery query = new XPathMessageQuery(xpath, messageContext);
//store the xpath in the Tag property; this combo's selectedValue is bound to i
typeEntry.Tag = query;
this.SelectedIndex = 0;
this.IsDropDownOpen = false;
this.Query = query;
this.RaiseEvent(new RoutedEventArgs(XPathCreatedEvent, this));
}
catch (Exception err)
{
MessageBox.Show(
err.Message,
(string)this.Resources["controlTitle"],
MessageBoxButton.OK, MessageBoxImage.Error);
}
}
}
static WorkflowService GetService()
{
Variable<Customer> customer = new Variable<Customer>();
Variable<Order> order = new Variable<Order>();
Variable<string> drug = new Variable<string>();
Variable<double> adjustedCost = new Variable<double>();
Variable<int> percentagePaidByInsurance = new Variable<int>();
Variable<CorrelationHandle> customerHandle = new Variable<CorrelationHandle>();
Variable<CorrelationHandle> orderHandle = new Variable<CorrelationHandle>();
XPathMessageContext pathContext = new XPathMessageContext();
pathContext.AddNamespace("psns", Constants.PharmacyServiceNamespace);
MessageQuerySet GetOrderQuerySet = new MessageQuerySet
{
{
"OrderID",
new XPathMessageQuery("//psns:Order/psns:OrderID",pathContext)
}
};
MessageQuerySet GetOrderIDQuerySet = new MessageQuerySet
{
{
"OrderID",
new XPathMessageQuery("//ser:guid",pathContext)
}
};
MessageQuerySet customerQuerySet = new MessageQuerySet
{
{
"CustomerID",
new XPathMessageQuery("//psns:GetBaseCost/psns:Customer/psns:CustomerID",pathContext)
}
};
MessageQuerySet customerIDQuerySet = new MessageQuerySet
{
{
"CustomerID",
new XPathMessageQuery("//ser:guid",pathContext)
}
};
// This will use implicit correlation within the workflow using the WorkflowServiceHost's default CorrelationHandle
Receive prescriptionRequest = new Receive
{
DisplayName = "Request Perscription",
OperationName = "GetBaseCost",
ServiceContractName = Constants.PharmacyServiceContractName,
CanCreateInstance = true,
//CorrelatesWith = customerHandle, -- add this line for explicit correlation
CorrelatesOn = customerQuerySet,
Content = new ReceiveParametersContent
{
Parameters =
{
{"Customer",new OutArgument<Customer>(customer)},
{"Drug",new OutArgument<string>(drug)},
}
}
};
// This will use implicit correlation within the workflow using the WorkflowServiceHost's default CorrelationHandle
Receive GetInsurancePaymentPercentageRequest = new Receive
{
DisplayName = "Get Insurance Coverage",
ServiceContractName = Constants.PharmacyServiceContractName,
OperationName = "GetInsurancePaymentPercentage",
CanCreateInstance = true,
//CorrelatesWith = customerHandle, -- add this line for explicit correlation
CorrelatesOn = customerIDQuerySet,
Content = ReceiveContent.Create(new OutArgument<Guid>())
};
// This will explicitly correlate with the SendReply action after the prescriptionRequest using the OrderID (stored in the orderHandle)
Receive GetAdjustedCostRequest = new Receive
{
DisplayName = "Get Adjusted Cost",
OperationName = "GetAdjustedCost",
ServiceContractName = Constants.PharmacyServiceContractName,
CanCreateInstance = true,
CorrelatesOn = GetOrderIDQuerySet,
CorrelatesWith = orderHandle,
Content = ReceiveContent.Create(new OutArgument<Guid>())
};
Activity PrescriptonWorkflow = new Sequence()
{
Variables = { customer, order, drug, percentagePaidByInsurance, adjustedCost, customerHandle, orderHandle },
Activities =
{
new WriteLine
{
Text = "Beginning Workflow"
},
new Parallel
{
Branches =
{
new Sequence
{
Activities =
{
GetInsurancePaymentPercentageRequest,
new Assign<int>
{
To = new OutArgument<int>( (e) => percentagePaidByInsurance.Get(e) ),
Value = new InArgument<int>( (e) => new Random().Next(0,100))
},
new SendReply
{
DisplayName = "Return Percentage",
Request = GetInsurancePaymentPercentageRequest,
Content = SendContent.Create(new InArgument<int>((e) => percentagePaidByInsurance.Get(e)))
}
}
},
new Sequence
{
Activities =
{
prescriptionRequest,
new WriteLine
{
Text = new InArgument<string>(env => (string.Format("{0}, {1}\t{2}", customer.Get(env).LastName ,customer.Get(env).FirstName,customer.Get(env).CustomerID.ToString())))
},
new Assign<Order>
{
To = new OutArgument<Order>(order),
Value = new InArgument<Order>( (e) => new Order() { CustomerID = customer.Get(e).CustomerID, Drug = drug.Get(e), OrderID = Guid.NewGuid() } )
},
new WriteLine
{
Text = new InArgument<string>(env => (string.Format("OrderID: {0}", order.Get(env).OrderID.ToString())))
},
new Assign<int>
{
To = new OutArgument<int>( (e) => order.Get(e).Cost ),
Value = new InArgument<int>( (e) => new Random().Next(20,50))
},
new SendReply
{
DisplayName = "Send Adjusted Cost",
Request = prescriptionRequest,
// Initialize the orderHandle using the MessageQuerySet to correlate with the final GetAdjustedCost request
CorrelationInitializers =
{
new QueryCorrelationInitializer
{
CorrelationHandle = orderHandle,
MessageQuerySet = GetOrderQuerySet
}
},
Content = SendContent.Create(new InArgument<Order>((e) => order.Get(e)))
}
}
}
}
},
new Assign<double>
{
To = new OutArgument<double>( (e) => adjustedCost.Get(e) ),
Value = new InArgument<double>( (e) => order.Get(e).Cost * (100-percentagePaidByInsurance.Get(e)) *.01)
},
new WriteLine
{
Text = new InArgument<string>(env => (string.Format("Base Cost: ${0}", order.Get(env).Cost.ToString())))
},
new WriteLine
{
Text = new InArgument<string>(env => (string.Format("Insurance Coverage: {0}%", percentagePaidByInsurance.Get(env).ToString())))
},
new WriteLine
{
Text = new InArgument<string>(env => (string.Format("Adjusted Cost: ${0}", decimal.Round(Convert.ToDecimal(adjustedCost.Get(env)),2))))
},
GetAdjustedCostRequest,
new SendReply
{
Request = GetAdjustedCostRequest,
Content = SendContent.Create(new InArgument<double>((e) => adjustedCost.Get(e)))
},
new WriteLine
{
Text = "Workflow Completed"
}
}
};
WorkflowService service = new WorkflowService
{
Name = "PharmacyService",
Body = PrescriptonWorkflow,
ConfigurationName = "PharmacyService"
};
return service;
}
