|By Dave Chappell||
|May 25, 2005 07:30 PM EDT||
Myth #6: Portals can be connected to back-end systems by simply using a Web service call.
While Web service calls can theoretically be used to connect portals with back-end target systems, this approach won't scale past a few back-end systems. An ESB allows the portal server to have a single interface to the bus, with the bus providing the mediation between the diverse connectivity options, protocols, security, and data formats across all of the possible back-end systems that a portal server may call upon to fulfill its requests.
Using an ESB as the layer between the portal server and the various back-end applications that the portal server needs to interact with, ESB adopters are building for the future by providing a more scalable and flexible SOA that is capable of handling the ever-expanding scope of integration as the portal project becomes more successful and business requirements change.
Myth #7: ESBs will be obsolete once BPEL is widely available.
An ESB may support multiple ways of coordinating the interaction between event-driven service invocations using formal business process definitions. BPEL (Business Process Execution Language) is one way of doing it, and there are others as well. An ESB also has itinerary-based routing, which provides a message with a list of routing instructions. These routing instructions, which represent a business process definition, are carried with the message as it travels through the Bus across service invocations. The remote ESB service containers determine where to send the message next.
Itinerary-based routing significantly contributes to the highly distributed nature of the ESB, as there is no centralized rules engine to refer back to for each step in the process. A centralized rules engine for the routing of messages, such as those offered by the typical hub-and-spoke EAI broker approach, can be a bottleneck, and also a single point of failure. The use of message itineraries, messages and process definitions is self sufficient and can therefore allow different parts of the ESB to operate independently of one another.
Message itineraries are most useful for discreet process definitions that are stateless and usually contain a finite set of steps that don't take extended periods of time to complete. Gartner refers to this type of process definition as "microflows." Simple branching within itineraries may occur based on the use of content-based routing services.
When more sophisticated process definitions are required, a process orchestration engine may be layered onto the ESB as an additional service. The process orchestration may support stateful processes, which can span long durations of time. It may also support parallel execution paths, with branching, and merging of message flow execution paths based on join conditions or transition conditions being met. Such a process engine may support BPEL, or some other process definition grammar such as ebXML BPSS. Sophisticated process orchestration can be combined with stateless itinerary-based routing to create an SOA that solves complex integration problems.
Myth #8: The ESB technology category, like so many others, seems to have come out of nowhere and is now barreling its way up the hype curve and rapidly approaching the "trough of disillusionment."
The ESB concepts were created as a result of working with IT thought leaders across a variety of industries, including manufacturing, e-marketplaces, telco, financial services, and retail. The ESB as a concept was born out of a necessity, based on their desire for a new approach over distributed computing models and EAI technologies they had already been moderately successful with. These IT thought leaders all came with a common request: "We really like your distributed messaging infrastructure, and we would like to build upon it a standards-based event-driven SOA for integration. We would like it to include things like Web services, XML data transformation, content-based routing, and a service invocation model based on distributed process coordination." Because of this, the concepts presented in the ESB architecture are sound; they are grounded in reality. Also because of this, ESB technology has been adopted as it has been built. There are 100s of ESB deployments already in use today in areas such as supply chain and logistics automation, straight through processing in financial services, real-time provisioning in Telco, and remote storefront integration in retail.
Myth #9: ESBs are simply plumbing and do not provide sophisticated tooling, such as a graphical editor for designing business process flows.
There is a new breed of IDE, which Gartner Group refers to as an ISE (integrated services environment), that allows you to design, configure, test, and debug the integration services that you develop when building an SOA with an ESB. Using a graphical interface, an integration architect draws diagrams using UML notation to describe process definitions. You may also use the ISE to graphically create data transformations between different data formats, and create and debug XSLT style- sheets.
Myth #10: An ESB container can be implemented using an EJB container.
One of the key components of an ESB architecture is a highly distributed, lightweight service container. The service container allows the hosting of integration components as event-driven services, such as a content-based routing service that applies an XPath expression to an XML message to determine where to route it next. The service container can also host custom services or specialized adapters for hooking into packaged applications.
Unlike its distant cousins, the app server container and the integration broker, the ESB service container allows the selective deployment of integration services exactly when and where you need them, and nothing more. In contrast, you need to install an entire appserver stack everywhere that an individual piece of integration functionality is needed. This results in what is referred to as the "appservers everywhere" problem. There is an unnecessarily high cost in licensing, installation, and cost of ownership over time associated with this practice.
The mantra of the ESB is "configuration rather than coding." In an application server-centric approach to integration, you typically write code to describe the dependencies between services. The EJB model follows the client/server model of interaction, which usually results in tightly coupled interfaces between services in an SOA, which is built into code, and compiled into class files that need to be modified and redeployed every time a change needs to be made.
In an ESB, a service is configured with information regarding its input and output channels for sending and receiving message-based request/response patterns and one-way event notifications that are then coordinated by the surrounding invocation framework - not by the service itself.
An ESB service can be configured and deployed, by merely supplying it with the XSL stylesheets, XPath expression, scripts, and parameters which are read in from a configuration repository. Once deployed, the implementation is remarkably resilient to change.
To sum this up, make sure that your understanding of ESB contains these things:
- An ESB provides the backbone for building an enterprise SOA-based integration environment.
- The evolving WS-* specifications will help make ESBs even more interoperable than they are today. Adopting an ESB today will allow you to build for the future and be capable of adapting to the WS-* specifications as they become commercially viable.
- ESB is not just an abstract pattern. It is a product category with a distinct definition and many vendor offerings.
- ESBs and application servers are highly complementary.
- ESBs can help portal server integration to back-end systems by providing the necessary diversity in connectivity and scalable infrastructure.
- ESBs provide many choices for coordinating service interactions.
- ESB technology is grounded in reality and is already being adopted by many industries.
- ESBs can provide the higher-level visual tools for integrating services in an ISE environment.
- ESBs provide a service container environment that is lightweight, configurable, and highly distributable.
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