Welcome!

Microservices Expo Authors: Zakia Bouachraoui, Elizabeth White, Pat Romanski, Liz McMillan, Yeshim Deniz

Related Topics: Microservices Expo

Microservices Expo: Article

ESB Myth Busters: 10 Enterprise Service Bus Myths Debunked

Clarity of Definition for a Growing Phenomenon

Since releasing my latest book, Enterprise Service Bus (O'Reilly Media, 2004), I have been doing a fair amount of visiting corporations, conducting seminars, and generally discussing with enterprise architects the subject of enterprise service-oriented architecture (SOA) and how an enterprise service bus (ESB) backbone can be leveraged to provide a framework for an enterprise SOA. Along the way, I have been asked many questions about the nature of an ESB. I have also fended off some misconceptions that have been growing in the general IT population regarding what an ESB is and when, where, and how it can be used. I have gathered together the most popular questions and misconceptions, and offer some clarity in the form of a "top ten" list.

Myth #1. ESB is just a new name for EAI.
While many IT architecture groups are focusing on building SOAs, they still inevitably beg the question of "how is ESB different from EAI?" An ESB is an infrastructure for building an enterprise SOA, and is capable of being used in a more general way than a conventional EAI broker. According to Forrester Research, an ESB helps enterprises obtain the value of SOA by increasing connectivity, adding flexibility that speeds change, and providing greater control over use of the important resources that it binds.

An ESB can be used to handle integration projects that have traditionally been relegated to EAI tools. However, an ESB can also be used for establishing B2B relationships across companies.

An ESB provides EAI capabilities, but is based on a fundamentally different architecture that is providing the basis of an industry transition from traditional integration to coordinated service interaction. EAI brokers are historically implemented as a monolithic stack, using centralized hub-and-spoke architecture.

An ESB provides the same base functionality as an EAI broker - connectivity, application adapters, routing of messages based on rules, and data transformation engine - yet, in an ESB, these capabilities are themselves SOA based in that they are spread out across the bus in a highly distributed fashion and hosted in separately deployable service containers. This allows the selective deployment of integration broker functionality exactly where you need it, with no additional over-bloating where it's not needed. The distributed nature of the ESB container model allows the independent scalability of integration components, which are plugged into your SOA as event-driven services on an as needed basis.

In order for an integration broker to be truly capable of supporting an SOA, and to be considered a true ESB, it would need to have its base functions broken up into their constituent parts, which would then be capable of being separately deployed across the bus while working together in harmony as necessary.

Let's use an example of an XSLT-based transformation engine that accepts an incoming XML document and applies an XSLT style sheet to it in order to produce an outgoing document in another XML format. I can tell you that there is nothing that can chew up computing resources more than the parsing and manipulation of XML. If this particular XSLT transformation sits between two popular applications that communicate regularly with each other, then that individual transformation can become a performance and scalability bottleneck. If you are using a monolithic hub-and-spoke integration broker approach, in order to remove the bottleneck and scale up the deployment you would need to either install that integration broker on one big powerful machine, or install the integration broker across multiple machines - just to support that one transform scenario! All the while, the other integration broker capabilities, such as the execution of routing rules, are competing for the same computing resources as the transformation operation.

In contrast to the monolithic hub-and-spoke architecture of an integration broker, the foundational core of an ESB provides a distributed services architecture. This architecture is built for integration and has the ability for integration broker functionality, such as message routing, data transformation, and application adapters to be selectively deployed on an as-needed basis.These are separate integration services that are a natural part of an SOA processing pipeline across the bus.

An individual XSLT transformation can be deployed as a service in its own ESB service container, and multiple instances of that container can be load-balanced across many machines. If the ESB container implementation is cross-platform, then you can be flexible as to what kinds of machines you spread the transform service across - Linux boxes, Solaris boxes, Windows boxes, and so on. And for those of you who don't find solace in the architectural purity of this discussion, consider this: the ESB vendors who are leading the charge in defining and delivering ESB products are also putting forth a license model where there is no additional cost for deploying as many of these lightweight ESB service containers as necessary to get the job done.

The integration services provided by the ESB can be combined with other services into SOA-based processing pipelines that can span business boundaries. The distributed services in an ESB can be combined with itinerary-based routing (see Myth #7) to allow self-directed, message-oriented service interactions, which allow different parts of the ESB to operate independently of one another, without relying on a centralized routing engine.

More Stories By Dave Chappell

David Chappell is vice president and chief technologist for SOA at Oracle Corporation, and is driving the vision for Oracle’s SOA on App Grid initiative.

Comments (8)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


Microservices Articles
When building large, cloud-based applications that operate at a high scale, it’s important to maintain a high availability and resilience to failures. In order to do that, you must be tolerant of failures, even in light of failures in other areas of your application. “Fly two mistakes high” is an old adage in the radio control airplane hobby. It means, fly high enough so that if you make a mistake, you can continue flying with room to still make mistakes. In his session at 18th Cloud Expo, Lee A...
In his general session at 19th Cloud Expo, Manish Dixit, VP of Product and Engineering at Dice, discussed how Dice leverages data insights and tools to help both tech professionals and recruiters better understand how skills relate to each other and which skills are in high demand using interactive visualizations and salary indicator tools to maximize earning potential. Manish Dixit is VP of Product and Engineering at Dice. As the leader of the Product, Engineering and Data Sciences team at D...
Lori MacVittie is a subject matter expert on emerging technology responsible for outbound evangelism across F5's entire product suite. MacVittie has extensive development and technical architecture experience in both high-tech and enterprise organizations, in addition to network and systems administration expertise. Prior to joining F5, MacVittie was an award-winning technology editor at Network Computing Magazine where she evaluated and tested application-focused technologies including app secu...
Containers and Kubernetes allow for code portability across on-premise VMs, bare metal, or multiple cloud provider environments. Yet, despite this portability promise, developers may include configuration and application definitions that constrain or even eliminate application portability. In this session we'll describe best practices for "configuration as code" in a Kubernetes environment. We will demonstrate how a properly constructed containerized app can be deployed to both Amazon and Azure ...
Modern software design has fundamentally changed how we manage applications, causing many to turn to containers as the new virtual machine for resource management. As container adoption grows beyond stateless applications to stateful workloads, the need for persistent storage is foundational - something customers routinely cite as a top pain point. In his session at @DevOpsSummit at 21st Cloud Expo, Bill Borsari, Head of Systems Engineering at Datera, explored how organizations can reap the bene...
Using new techniques of information modeling, indexing, and processing, new cloud-based systems can support cloud-based workloads previously not possible for high-throughput insurance, banking, and case-based applications. In his session at 18th Cloud Expo, John Newton, CTO, Founder and Chairman of Alfresco, described how to scale cloud-based content management repositories to store, manage, and retrieve billions of documents and related information with fast and linear scalability. He addresse...
The now mainstream platform changes stemming from the first Internet boom brought many changes but didn’t really change the basic relationship between servers and the applications running on them. In fact, that was sort of the point. In his session at 18th Cloud Expo, Gordon Haff, senior cloud strategy marketing and evangelism manager at Red Hat, will discuss how today’s workloads require a new model and a new platform for development and execution. The platform must handle a wide range of rec...
SYS-CON Events announced today that DatacenterDynamics has been named “Media Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY. DatacenterDynamics is a brand of DCD Group, a global B2B media and publishing company that develops products to help senior professionals in the world's most ICT dependent organizations make risk-based infrastructure and capacity decisions.
Discussions of cloud computing have evolved in recent years from a focus on specific types of cloud, to a world of hybrid cloud, and to a world dominated by the APIs that make today's multi-cloud environments and hybrid clouds possible. In this Power Panel at 17th Cloud Expo, moderated by Conference Chair Roger Strukhoff, panelists addressed the importance of customers being able to use the specific technologies they need, through environments and ecosystems that expose their APIs to make true ...
In his keynote at 19th Cloud Expo, Sheng Liang, co-founder and CEO of Rancher Labs, discussed the technological advances and new business opportunities created by the rapid adoption of containers. With the success of Amazon Web Services (AWS) and various open source technologies used to build private clouds, cloud computing has become an essential component of IT strategy. However, users continue to face challenges in implementing clouds, as older technologies evolve and newer ones like Docker c...