13: Orchestration Patterns with WF in .NET Access Code-128 in .NET 13: Orchestration Patterns with WF

13: Orchestration Patterns with WF use .net barcode code 128 printer toincoporate code-128b for .net upc barcode if(ApproveOrderEvent != Visual Studio .NET code128b null) { ApproveOrderEvent(null, new ApproveOrderEventArgs(wfId, order)); } } ..

. }. Example 13.12 The IOrderContract inter USS Code 128 for .NET face implemented by this data exchange service defines the contract for the workflow:. [System.Workflow.Activit ies.

ExternalDataExchange] public interface IOrderContract { event EventHandler<CreateQuoteEventArgs> CreateQuoteEvent; event EventHandler<ApproveOrderEventArgs> ApproveOrderEvent; event EventHandler<RejectOrderEventArgs> RejectOrderEvent; void QuoteCreated(QuoteResponse response, ManualResetEvent completionEvent); void OrderApproved(ApproveResponse response, ManualResetEvent completionEvent); void OrderRejected(RejectResponse response, ManualResetEvent completionEvent); }. Example 13.13 The code h VS .NET Code 128 Code Set A ighlighted with red represents incoming messages posted to the workflow, whereas the bold code represents outgoing messages originating from the workflow.

Note that all incoming interfaces are defined as events with all event argument classes deriving from ExternalDataEventArgs. All outgoing interfaces are just straight-forward method definitions..

Since you control how th e workflow is published, support for formal contracts depends on how you choose to implement the communication layer.. 13.1 Process Abstraction and Orchestrated Task Services NOTE When taking into account ANSI/AIM Code 128 for .NET the Service Discoverability (702) principle and the Metadata Centralization [754] pattern, it is worth noting that because service interfaces for workflows are based on either ASMX or WCF technology, WF orchestrations expose the discovery interfaces provided by these technologies. For example, retrieving the WSDL documents via a URL ending in wsdl.

WCF-based services also support retrieving service metadata, such as WSDL definitions and policy documents, via WS-MetadataExchange. However, you do have to explicitly enable metadata retrieval in WCF. Visual Studio can present WF orchestrations and services packaged as custom activities in the Toolbox pane to increase developer awareness of the common services approved for broad consumption.

Note also that WF, in combination with WCF 4.0, allows for registration via the WS-Discovery industry standard..

WS-I BasicProfile Support Publishing workflows as .net vs 2010 Code 128 ASMX services enables the use of basic Web services through the WebServiceInput, WebServiceOutput, and InvokeWebService activities. The former two handle requests and responses for a workflow published as an orchestrated task service and the latter allows workflows to interact with Web services.

This feature is available in all WF versions, but its limited support for contemporary WS standards makes WCF a commonly preferred option. Note that when you develop ASMX services without WF, ASMX can emit errors for a non WS-I compliant service interface. With WF services published through WF s Publish as Web service feature, you may not see these compliance warnings from the compiler when you publish because the WebService class is compiled behind the scenes.

You need to separately check your message type definitions for compliant namespace definitions and other incompatibilities caught by the compiler.. NOTE If you follow a contract Visual Studio .NET code 128 barcode -first design approach, you can pay special attention to designing your service contract for WS-I BasicProfile compliance. Tools such as WSCF, WSCF.

blue for WCF or the Web service Software Factory can be used to help verify WS-I BasicProfile compliance as part of a contract-first design process.. 13: Orchestration Patterns with WF In WF 3.5 and WF 4.0, WC code 128 barcode for .

NET F support for industry standard transports, protocols and policies transfers to WF Workflow Services. All communication aspects for Web services published into IIS can be configured in the Web.Config file.

The basicHttpBinding configures a message exchange over SOAP and HTTP. This follows the rules of the WS-I BasicProfile, in both service and consumer endpoint configurations. Exposing a WCF3.

5 Workflow Service in WAS or IIS required a .svc to bind the workflow to an endpoint. The .

svc file either referenced a CodeBehind service definition or a workflow in a compiled assembly. Here is a .svc file example for a compiled workflow:.

<%@ ServiceHost Facto ry="System.ServiceModel.Activation.

WorkflowServiceHostFactory" Service= "StandardMold.QuoteProcess.CustomerService" %>.

Example 13.14 The WorkflowServiceHostF actory loads the configuration matching the service type from the system.serviceModel section in the Web.Config file.

WF 4.0 no longer requires a .svc file, but requires the file extension .

xamlx on the workflow definition file for WAS or IIS to host the Workflow Service. The following configuration snippet applies the basicHttpBinding to the service endpoint matching the service type in the .svc file:.

<system.serviceModel& code 128a for .NET gt; <services> <service name="StandardMold.

Services.CustomerService" behaviorConfiguration=" StandardMold.Services.

CustomerServiceBehavior"> <endpoint address="...

" binding="basicHttpBinding" contract= "StandardMold.QuoteProcess.ICustomerService"> </endpoint> </service> </services> <behaviors> .

.. </behaviors> </system.

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