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In this chapter, we covered basic messaging concepts, JMS, and MDBs. Messaging is an extremely powerful technology for the enterprise, and it helps build loosely coupled systems. JMS allows you to use message-oriented middleware (MOM) from enterprise Java applications. Using the JMS API to build a message consumer application can be time consuming, and MDBs make using MOM in a standardized manner through Java EE extremely easy. Note, however, that messaging and MDBs are not right for all circumstances and can be overused. One such case is using the request/reply model (discussed in the sidebar The request-reply model ), which entails a lot of extra complexity compared to simple PTP or pub-sub messaging. If you find yourself using this model extensively and in ways very close to synchronous messaging, it might be worth thinking about switching to a synchronous technology such as RMI, SOAP, or remote session bean calls. A few major EJB features we touched on in this chapter are dependency injection, interceptors, timers, transaction, and security. As you ve seen, EJB 3 largely relieves us from these system-level concerns while providing extremely robust and flexible functionality. We ll discuss dependency injection, timers, and interceptors in the next chapter. free code 128 barcode generator c# C# Imaging - C# Code 128 Generation Guide - RasterEdge.com
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11 Jul 2018 ... I have looked for several options and libraries to generate a code128 barcode . It appears that there are three versions of code128 . Code128A ... target ManagedWrapper::CryptoAlgorithm class. Such a tracking handle can be passed as a constructor argument. To store the tracking handle, the gcroot template is needed. (Since CryptoAlgorithmProxy is a native class, it cannot contain member variables of tracking handle types.) class CryptoAlgorithmProxy : public NativeLib::CryptoAlgorithm { gcroot<CryptoAlgorithm^> target; public: CryptoAlgorithmProxy(CryptoAlgorithm^ target) : target(target) {} // Encrypt and Decrypt are discussed later }; Instead of wrapping the abstract native class CryptoAlgorithm, the managed wrapper class acts as a wrapper for the concrete derived class CryptoAlgorithmProxy. The following code shows how this is done: public ref class CryptoAlgorithm abstract : INativeCryptoAlgorithm { CryptoAlgorithmProxy* pWrappedObject; public: CryptoAlgorithm() { pWrappedObject = new CryptoAlgorithmProxy(this); if (!pWrappedObject) throw gcnew OutOfMemoryException("Allocation on C++ free store failed"); } ~CryptoAlgorithm() { delete pWrappedObject; } internal: [CLSCompliant(false)] virtual NativeLib::CryptoAlgorithm& GetWrappedObject() = INativeCryptoAlgorithm::GetWrappedObject { return *pWrappedObject; } public protected: virtual void Encrypt( array<Byte>^ data, array<Byte>^ buffer, int% nNumEncryptedBytes) abstract; virtual void Decrypt( array<Byte>^ data, array<Byte>^ buffer, int% nNumEncryptedBytes) abstract; }; gen code 128 c# Barcode Fonts DLL Integration with C# - Barcode Resource
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This isn't a direct answer BUT I would strongly recommend to use a well-tested library for generating barcodes... getting barcodes right isn't ... EJB internals Dependency injection of the @Resource annotation Crosscutting concerns with interceptors Task scheduling with the EJB timer The main advantages of brokered authentication are as follows: Centralized authentication: Having a single source for authentication simplifies the management of the identity information. The services won t need to create and manage their own set of users; they can rely upon the centralized identity broker to perform these tasks. Single sign-on (SSO) capabilities: This model allows clients to authenticate once and then use the same token for different services within the organization. Stronger security: Brokered authentication relies on robust authentication mechanisms such as X.509 certificates and Kerberos. The storage of passwords and the protection mechanisms are more reliable than those that could be implemented by a developer that follows a direct authentication pattern. Direct trust: In this scenario the client and the service don t need to trust each other directly. This means that the services can rely on somebody else to add, remove, and update the identity information from their client base. creating barcode 128 in c# Create Code 128 barcodes with C# Sharp - BarCodeWiz
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Locate BarCodeWizFontsNet.dll and click Add. The default location is: C:\ Program Files (x86)\BarCodeWiz Code 128 Fonts\DotNet\net40 (use with .NET 4.0 or ... In the previous two chapters we focused on developing session beans and message-driven beans (MDBs). Although we discussed a few bean type-specific features in detail, we generally avoided covering topics not closely related to introducing the basics. In this chapter we build on the material in the previous chapters and introduce advanced concepts applicable to MDBs and session beans. It is very likely that you ll find these EJB 3 features extremely helpful while using EJB in the real world. We begin by discussing the how containers provide the services behind the scenes and how to access environment information. We then move on to advanced use of dependency injection, JNDI lookups, EJB interceptors, and the EJB timer service. As you ll learn, EJB 3 largely relieves you from these system-level concerns while providing extremely robust and flexible functionality. As a foundation for the rest of the chapter, we briefly examine these EJB internals first. Although we ve talked about the role of the container and the concept of managed services, we haven t explained how most containers go about providing managed services. The secret to understanding these and the other EJB services is knowing how the container provides them. Without going into too much detail, we ll discuss EJB objects which perform the magic of providing the service and then examine the EJB context which a bean can use to access runtime environment and use container services. code 128 c# How to Generate Code 128 Using C# .NET Barcode Generator
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