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To call a .NET web service, a proxy has to be generated. If you use Visual Studio, it includes wizards that do this automatically. Using the console, the following command generates a proxy: $ wsdl http://jupiter:8008/1.1/webservice/TestService.asmx page=wsdl Microsoft (R) Web Services Description Language Utility [Microsoft(R) .NET Framework, Version 2.0.41202.0] Copyright (C) Microsoft Corporation. All rights reserved. Writing file 'C:\cygwin\home\cgross\desktop\documents\active\ oop-using-net-patterns\src\Chap04.Webservice\webservice\TestService.cs'. The wsdl command converts a Web Services Description Language (WSDL) file into a proxy. A WSDL file is the equivalent of an interface in web-service-speak. The generated wsdl file will appear similar to the following (please note that most of the file has been cut out to simplify the explanation): [System.Diagnostics.DebuggerStepThroughAttribute()] [System.ComponentModel.DesignerCategoryAttribute("code")] [System.Web.Services.WebServiceBindingAttribute( Name="TestServiceSoap", Namespace="http://tempuri.org/")] public partial class TestService : System.Web.Services.Protocols.SoapHttpClientProtocol { } The type TestService is a class, and this is a problem for the Client-Dispatcher-Server pattern, because it expects an interface or at least an abstract base class. There is no magic hook to regenerate the code so that an interface is defined and referenced in the TestService type. The only solution is to run the wsdl generator twice as illustrated here: $ wsdl /serverInterface http://jupiter:8008/1.1/webservice/TestService.asmx page=wsdl Microsoft (R) Web Services Description Language Utility [Microsoft(R) .NET Framework, Version 2.0.41202.0] Copyright (C) Microsoft Corporation. All rights reserved. Writing file 'C:\cygwin\home\cgross\desktop\documents\active\ oop-using-net-patterns\src\Chap04.Webservice\webservice\ TestServiceInterfaces.cs'. $ wsdl http://jupiter:8008/1.1/webservice/TestService.asmx page=wsdl Microsoft (R) Web Services Description Language Utility [Microsoft(R) .NET Framework, Version 2.0.41202.0] Copyright (C) Microsoft Corporation. All rights reserved. Writing file 'C:\cygwin\home\cgross\desktop\documents\active\ oop-using-net-patterns\src\Chap04.Webservice\webservice\TestService.cs'. In the first instance of running the wsdl command, the command-line option /serverInterface is used. This option generates a file that contains an interface that implements a web service on the server. The trick lies in taking the generated file, removing all of the

As data moves between networks, you need to tell it where to go. Moving data through networks is called routing. In the following sections, we ll show how to route data packets and how to secure the routing techniques used to move that data along. First, we will explain a packet, and then we will move on to explain the various types of devices that packets will encounter as they traverse the Internet. This includes gateways, routers, and firewalls.

attributes, and then subclassing the type TestServiceInterface in the type TestService. The resulting code will appear similar to the following: [System.Diagnostics.DebuggerStepThroughAttribute()] [System.ComponentModel.DesignerCategoryAttribute("code")] [System.Web.Services.WebServiceBindingAttribute( Name="TestServiceSoap", Namespace="http://tempuri.org/")] public partial class TestService : System.Web.Services.Protocols.SoapHttpClientProtocol, ITestServiceSoap { } Optionally, this redefined type is then encapsulated in a factory as illustrated by the following source code: namespace Chap04.Webservice { public static class Factory { public static ITestServiceSoap Create() { TestService srvc = new TestService(); return srvc; } } } The three pieces of code, TestService, TestServiceInterface, and Chap04.WebService. Factory, are compiled into an assembly. The assembly then behaves like any locally installed assembly, except when the contained type is called, the call is delegated to a remotely located web service implementation. We ve come to the end of this discussion of the Client-Dispatcher-Server pattern. Next up, I ll present one final structural pattern to round out this chapter: the Micro-Kernel pattern.

To understand how routing data works, we first need to explore what a packet is. A packet is a generic term for a bundle of data, organized in a predetermined way for transmission over

A potentiometer is also a passive-type sensor, and is connected to the NXT using the same two connections you used for the contact and resistive sensors from s 4 and 5. Connecting the NXT to the left and center terminals creates an angle sensor that increases in resistance with clockwise rotation, as shown in Figure 6-2. Connecting to the center and right terminals makes a counterclockwise sensor. In either case, it s a good idea to connect the remaining outer terminal to the center terminal.

computer networks. Packets consist of the data to be transmitted over the network along with information about how to control transmitting the packet, including its source and destination addresses.

The Micro-Kernel pattern3 makes it possible for systems to adapt to changing requirements. The big picture idea of the Micro-Kernel pattern is to future-proof an application so that a change in the application won t require extensive recoding of the entire application. This pattern sounds promising, but has had a bad reputation because of how it has been used in the industry. The Micro-Kernel pattern is usually associated with an operating system. For example, the original version of Windows NT had a micro-kernel architecture. The GNU Hurd operating system had a micro-kernel architecture. For many people, the original version of Windows NT and GNU Hurd aren t the best examples of how to properly implement a micro-kernel architecture, as both operating systems were slow. Micro-kernels can be slow for operating systems because operating systems require that there be as few abstractions as possible. For an application, a micro-kernel isn t slow since applications tend to be based on abstraction. Architecting a micro-kernel can be difficult if the pattern isn t followed. The pattern has a certain degree of redundancy built in, which, when

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