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In addition, ORB allowed us to move away from point-to-point integration, 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 you will see later. 5 introduced the concept of language independence via the use of an interface definition language (IDL). The interfaces declared through IDL can be mapped to any programming language. They allow, in principle, the client and server to be implemented in two different languages. Another important concept introduced in 5 is the registry, which is used by server objects to register themselves so they can be located by the client. You also learned that the major drawback of both distributed objects and RPC is the lack of scalability. This lack of scalability results from the synchronous nature of the interaction between the server and the client. For synchronous method calls, the client is blocked from performing further work until the server completes its work and returns the control to the client. Another disadvantage is that RPC- and ORB-based communication is not reliable and there is no guarantee that the messages and return values will be delivered to the intended targets. Therefore, the client application may experience a hang-up in its operation under certain circumstances, such as when the network connection is down or when the two applications are not up and running at the same time. Asynchronous messaging is used to overcome these two problems, as discussed in 6. In addition, asynchronous messaging has other advantages. In asynchronous messaging, the client or client object sends a message to the target application but does not wait for the response to continue its work, thus leading to a certain amount of decoupling between the applications involved. Therefore, asynchronous messaging may be employed as the basis for integration if high transaction volumes are expected. Asynchronous messaging can also guarantee delivery of messages between applications being integrated. As you will see in 8, an asynchronous messaging system can also form the core of an Enterprise Service Bus. In the next section we discuss how the introduction of these new and different technologies for enterprise applications integration led to the problem of heterogeneity in large enterprises. The various solutions to this problem are what led to further developments that are most commonly associated with SOA and service-oriented integration. Heterogeneity Problem Perhaps the development of SOA and services (for example, Web Services), beyond the ideas discussed in Part II of this book, owes much
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to the realization that the technologies discussed in 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, more than one technology is generally used to integrate applications. Therefore, it is literally impossible to impose enterprisewide standards in this respect. Various kinds of technological heterogeneity can exist in a large enterprise, including the following:
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Middleware heterogeneity In a large enterprise, more than one type of middleware is generally used. The two most common types are application servers and message-oriented-middleware (MOM). In addition, brand (vendor) heterogeneity 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. 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 and publish-and-subscribe. Therefore, many times a situation arises where the styles of interaction supported by the two applications that wish to interact do not match. Hence, these applications cannot interact with one another. This situation is shown schematically in Figure 7.1.
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