MESSAGING SYSTEMS in .NET

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One of the greatest benefits of SOAP is that it's part of an open process that has been embraced at an unprecedented level by most of the major hardware and software vendors. The SOAP specification is an open technology (having been submitted to the W3C) that provides the basis for application-t o-application integration known as Web Services. Benefits of using XML with SOAP The fundamental building block of SOAP is XML. SOAP defines a specialized yet flexible XML grammar that standardizes the format and structure of messages. Messages are- in turn- the fundamental method for exchanging information between Web Services and Web Service consumers. Using XML to encode SOAP messages provides several benefits- such as the following: It's human-readable- making it easier to understand and debug. Parsers and related technologies are widely available. It's an open standard. Many related technologies that can be leveraged in SOAP are included. Thus- XML is a natural choice for encoding SOAP messages- and it contributes to the simplicity of the specification (at least in relation to more complex binary protocols such as COM and CORBA). Transporting messages Typically- a Web Service consumer will send a message to a Web Service- requesting a specific operation to be performed. The Web Service processes this request and typically (but not necessarily) returns the results in a response message. This request/response model is conceptually akin to the Remote Procedure Call (RPC) model. To transport SOAP messages- you need a transport protocol. The obvious choice for a transport protocol is HTTP because it's used on so many systems today. In additionHTTP is allowed through most firewalls- making it easy to get up and running without requiring administrators to open more ports through their corporate firewalls. Although HTTP is an obvious choice for a transport protocol (and the one that most major vendors are implementing)- the SOAP specification doesn't require a specific transport protocol. It's quite possible to transport SOAP messages over other transport mechanisms- such as SMTP and FTP. However- the default transport protocol for ASP.NET Web Services based on SOAP is HTTP. So- in a nutshell- SOAP provides the following capabilities: Enables interoperability between systems using standard- widely available protocols such as XML and HTTP. Allows systems to communicate with each other through firewalls without having to open up additional- potentially unsafe ports. SOAP fully describes each data element in the message- making it easier to understand and troubleshoot problems that may occur. Arguably- as important as what SOAP does to enable interoperability is what it doesn't do. Specifically- SOAP doesn't do any of the following: Attempt to define how objects are created or destroyed. Impose any specific security mechanism or implementation. Define an authentication scheme. At first glance- these might seem to be serious shortcomings. However- in reality- they allow each platform to address these issues in a way that best suits its needs. For example- SOAP messages can also be exchanged over SSL to provide a secureencrypted connection between the client and server. Now that you have a basic understanding of SOAP- let's take a closer look at some of the fundamental parts of the SOAP specification.
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immunity events. The item to keep in mind is that these techniques work best with a spectrum analyzer and can be used not only in the engineering laboratory but also at a test site. What we are interested in is whether radiated energy from the EUT is affected. The element of interest is not the magnitude of the emission but the fact that a disruption of a propagating field occurs. When field disruption happens, one is able to locate the leak point to a certain degree. After one performs this high-level troubleshooting, probes and diagnostic tools become useful. 9.2.1 The Plain Wave and Standing Wave Technique Of all diagnostic techniques, using the bare hand is the least expensive but highly efficient means of locating where a leak point of radiated EMI from enclosures exists. This is an uncalibrated technique. The human body not only has a specific selfresonant frequency and impedance but also contains parasitic capacitance. This parasitic capacitance is the result of metallic structures both on and in the body (jewelry and metal plates/screws from surgery). Radiated fields are affected by parasitic capacitance to nearby metallic structures. Parasitic capacitance permits the transference of radiated fields from a driven source to 0 V potential the same configuration as a dipole antenna with a voltage-driven element and a return. The body is at 0 V potential while the EUT is at voltage potential; thus an efficient transmitter for RF fields is available between the system and human body (or domestic animals, which are an appropriate but poor substitute). By placing the body between the antenna and EUT during EMI testing or by waving the hand between assemblies and components, significant disruption of radiated fields may occur. Placing a hand over or on an enclosure seam or on top of a PCB may cause a disruption in field propagation. We are interested in the effects that a hand has on the system, not the actual value of attenuation provided. It is for this reason one is not permitted to stand on the turntable next to the EUT during a qualification test. The body affects field propagation, especially when one stands between the system and the antenna. 9.2.2 The Disabling-the-System Technique When troubleshooting EMC problems, one of the first goals is to determine the source of the noise before locating the coupling mechanism. One approach is to disconnect periphery devices or accessories, various subassemblies, circuit boards, and finally individual functions on a PCB. At the system level, disconnecting interconnect cables one at a time will aid in defining which cable is the primary radiator. If all cables are disconnected and radiation still exists, the source is likely not a cable but from the enclosure. Powering down or disabling each element of a system one at a time will aid in determining from where the source of the energy is coming. Sometimes in performing these steps the system will not be operational, which is acceptable at this stage of analysis. Troubleshooting does not mean the system has to be 100% functional. Disabling parts of a system is a valuable tool to quickly isolate a particular signal,
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The between search condition is commonly used with dates. The following code sample, also shown in Figure 7-3, locates all events from the Cape Hatteras Adventures sample database occurring during July 2001. The code first uses the CHA2 database and then queries that database:
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Part VII
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ANALOG TRANSMISSION
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ne of the grievous mistakes that many web designers (or whoever is in charge of SEO) make is to assume that SEO is a one-time activity. In point of fact, it is an ongoing process that must be monitored and maintained to be the most effective. In the first of two chapters in Part IV, 20 explains some of the most important elements of monitoring and maintaining your SEO efforts. In addition, 21 helps you understand how to analyze your SEO strategies and the techniques, conversions, and even other types of logs that are associated with SEO. These techniques will help you maintain SEO and continue to gain value from your SEO efforts.
Part VII: Working with Specialized Functionality
highly unconventional for math operations, but it s a strict interpretation of how Ruby views operators. So, how does a standard math operation work By employing some syntactic sugar (a convenient syntax that reduces typing for programmers), the language allows you to call a method with or without the dot and with or without the following expressions in brackets. So, of course, standard algebra works just fine:
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The complete code for the CalculateDiscount Function procedure is as follows: Public Function CalculateDiscount(dblQuantity As Double, _ dblPrice As Double) As Double Dim dblAmount As Double Dim dblDiscount As Double dblAmount = dblQuantity * dblPrice If dblAmount >= 150 And dblAmount < 250 Then dblDiscount = 0.1 ElseIf dblAmount >=250 Then dblDiscount = 0.15 End If Return dblDiscount End Function To call a function, you create a variable to accept the return value from the function, as the following code demonstrates: ReturnValue = <FunctionName>([Arguments list]) To call the CalculateDiscount function, you use the following code: Dim dblqty As Double = 10 Dim dblprice As Double = 10 Dim dbldiscount As Double dbldiscount = CalculateDiscount(dblqty, dblprice) MessageBox.Show(dbldiscount) You can also call a function within an expression. For example, consider the following code, which checks the discount returned from the CalculateDiscount function against a specific value: If CalculateDiscount(dblqty, dblprice) = 0.15 Then ' Execute statements End If
FIGURE 18.6
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