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which is important if a large number of applications need to be integrated. Also, this move away from point-to-point integration leads to the concept of Enterprise Service Bus (ESB), as discussed in later chapters. In addition, ORB introduces the concept of language independence by the use of an interface definition language (IDL). The interfaces declared through IDL can be mapped to any programming language and can allow, in principle, the client and server to be implemented in two different languages. Another important concept introduced in this chapter is that of a registry, which is used by the server objects to register themselves so that they can be located by the client.
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6: Asynchronous Messaging This chapter deals with asynchro-
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nous messaging, where the sender sends a message but does not wait for a response from the receiving end to continue its work. This increases the scalability of the solution of applications integration in an enterprise, which makes this method of applications integration very desirable when large volumes of messages are involved. Asynchronous messaging also separates out the code for marshalling and unmarshalling as well as the networking code as a separate application, thus resulting in code reuse because the same communication code can be used by many different applications for communicating among them. Asynchronous messaging also results in loose coupling because the interaction between applications is indirect through message queues. Another important advantage of messaging is that this method of communication between applications is much more reliable than either the RPC method or the Distributed Objects method of sharing data and functionality. This reliability is achieved by persisting the data being exchanged on both sides of the network. In other words, the data being exchanged is saved on the disks of the two computers involved in the exchange. As discussed in a later chapter, we can add a few components to the messaging system to turn it into a messaging bus, which is also known as an Enterprise Service Bus (ESB). The most notable component that needs to be added to a messaging system for converting it into an ESB is the router or a message broker. The main function of the message broker is to route the message based on the message content or message context. In this way, a further decoupling between the sending and receiving applications is achieved because the sending application does not need to know the address of the final destination. An ESB based on a messaging system provides a much more scalable solution than an ESB based on an application server.
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Part III: SOA-Based Integration
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In this section we discuss the technologies that are more commonly known as SOA-based integration technologies. These technologies were mainly the result of the realization that the technologies discussed in
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Part II lead to the problem of technological heterogeneity in large enterprises. This problem refers to the fact that, in a large enterprise or an inter-enterprise system consisting of an enterprise and its partners, one usually finds more than one technology used to integrate applications, and it is literally impossible to impose enterprisewide standards in this respect. Generally, a number of different kinds of technological heterogeneity exist in a large enterprise, including the following:
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Middleware heterogeneity Generally in a large enterprise, more than one type of middleware is being used. The two most common types are application servers and message-oriented middleware (MOM). In addition there is brand heterogeneity, which requires support for different brands of application servers and MOMs. Protocol heterogeneity This heterogeneity refers to the different transport protocols being used to access the services offered by various applications. Examples of such protocols include IIOP, JRMP, HTTP, and HTTPS. Related to the heterogeneity of communication protocols is the problem that different applications want to communicate with each other using incompatible protocols. For example, Application A might want to communicate with Application B using HTTP. However, for Application B the suitable protocol might be IIOP. In such cases, protocol transformation is needed so that Application A can communicate with Application B. Synchrony heterogeneity There is almost always a need to support both synchronous and asynchronous interactions between applications. In addition, there is sometimes a need for callback methods as well as publish and subscribe. Therefore, many times a situation arises in which the types of interaction supported by the two applications that wish to interact do not match. Hence, these applications cannot interact with one another. Diversity of data formats Sometimes the data format being exchanged varies. Most of the time the data is dependent on the middleware being used. This diversity of data can cause a problem if two applications that wish to interact support different data formats. Diversity of interface declarations Sometimes there are large differences in the way service interfaces are declared and used to invoke a service. For example, the way interfaces are declared in CORBA and Java RMI are different. No common place for service lookup Sometimes there s no common place to look up services to deal with the diversity of services in a large enterprise.
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