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0, providing a runtime environment for sequential and state-based workflows that are (mostly) visually designed, and compiled into code that will execute on the WF host that is present in the framework, and soon to be available to other applications such as Office This chapter gives you an introduction to this framework, and takes you through some of the tools that are available to you It will focus on the web-oriented aspects of building WF applications, namely how they can be exposed as web services (you can compile your sequential or state-based workflow into a web service that the rest of your application can use); and also how they can compose web services where your existing web services can be integrated into a workflow, giving you the ability to tie departments together into a coherent, centralized workflow..

The render response provides two methods for writing content to the portal page: getWriter() and getPortletOutputStream(). Both require that the content type be set on the response before the portlet retrieves the response s writer or output stream. Once the portlet calls one of these methods on a response, the other one is unavailable and will throw an IllegalStateException. The getWriter() method returns a PrintWriter object. The portlet can write text to the PrintWriter. This method is similar to its counterpart on the HttpServletResponse object.

To modify an <employee> node, we first need to retrieve it from the list of <employee> nodes. The employee ID of the employee will be taken from the combo box. To retrieve the <employee> node, we can use the SelectNodes() or SelectSingleNode() method. In our example, because there can be only one <employee> node matching the given employee ID, SelectSingleNode() is a better choice. After a reference to the <employee> node is retrieved, we can change its child nodes. The complete code implementing this logic is given in Listing 2-14. Listing 2-14. Modifying Existing Content private void button2_Click(object sender, EventArgs e) { XmlNode node=doc.SelectSingleNode("//employee[@employeeid='" + comboBox1.SelectedItem + "']");

WF is at its heart a programming model along with the runtime engine and the tools to create workflow applications The programming APIs are encapsulated in the NET 30 namespace SystemWorkflow The best place to get started is with the tools themselves They are available already with Visual Studio 2008, or as an add-on to Visual Studio 2005 Please note that if you have downloaded and installed the Orcas add-ons for Visual Studio 2005, WF is not included It is a separate download that can be obtained from the Windows Vista downloads section of MSDN, at http://msdn2microsoftcom/en-us/ windowsvista You ll look at the workflow templates in Visual Studio in the next section.

You will probably never use the portlet output stream, because it supports binary output for image streams and other similar applications. Binary content does not integrate into an HTML portal page, so support is there for portals that might use other markup types. For instance, if a telephony portal used the port86

if (node != null) { nodeChildNodes[0]InnerText = textBox1Text; nodeChildNodes[1]InnerText = textBox2Text; nodeChildNodes[2]InnerText = textBox3Text; XmlCDataSection notes = docCreateCDataSection(textBox4Text); nodeChildNodes[3]ReplaceChild(notes, nodeChildNodes[3]ChildNodes[0]); } docSave(ApplicationStartupPath + "/employeesxml"); } First, the code retrieves the <employee> node matching the selected employee ID by using the SelectSingleNode() method Carefully note the XPath expression that is used In XPath expressions, attributes are prefixed with the @ symbol Thus @employeeid refers to the employeeid attribute of the <employee> node The SelectSingleNode() method returns the selected node in the form of an XmlNode object Before we proceed and change its contents, we need to ensure that the SelectSingleNode() has returned a node This is done by checking whether the node returned is null or otherwise The XmlNode returned from the SelectSingleNode() method will be an <employee> node.

The portlet container may buffer the writer and the output stream, so output may not go to the user s web browser right away. The portlet manages the output buffering with several methods on the RenderResponse interface.

Just as a real business process is composed of a number of activities connected by rules and flow, a WF process application also uses activities, of which the template provides many out-of-the-box activities dealing with branching, input/output, managing external services and activities, and so on You can also compile your own activities into an activity library that can be reused by other workflow applications In addition, a workflow can of course contain another workflow as an activity within it The next component in the WF architecture is the WF runtime engine This executes the workflow, handling scheduling, rules, and everything necessary to make the workflow run as intended and designed When long-running stateful transactions are needed, the workflow will often need to be persisted to save on resources when it isn t being used Finally comes the host process The WF runtime engine is not an executable environment.