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 be... (more)
The notion of guaranteed delivery of Java Message Service messages has been
lightly touched on in other recently published articles on JMS. But what
really makes a JMS message "guaranteed"? Should you just take it on faith, or
would you like to know what's behind it?
This article answers these questions via a detailed discussion of message
persistence, internal acknowledgment rules, and message redelivery. Using
excerpts condensed from the book we coauthored, Java Message Service, we'll
explain how JMS guaranteed messaging works - including once-and-only-once
delivery semantics,... (more)
Web services have given newfound importance to service-oriented architectures
and promise to drive down the cost of integration by providing a
standards-based approach to interoperability between applications. The
trouble is, what people really want is a new way of doing integration. Until
now, we haven't really had a way to incorporate Web services into a
meaningful architecture for integrating applications and services into a
fabric that spans the extended enterprise in a large-scale fashion. With the
advent of the enterprise service bus we have that architecture.
The Java Bus... (more)
The past several years have seen some significant technology trends, such as
service-oriented architecture (SOA), enterprise application integration
(EAI), business-to-business (B2B), and Web services. These technologies have
attempted to address the challenges of improving the results and increasing
the value of integrated business processes, and have garnered the widespread
attention of IT leaders, vendors, and industry analysts. The enterprise
service bus (ESB) draws the best traits from these and other technology
trends to form a new architecture for integration. The ESB conc... (more)
Now that the WS-* specifications have become more mature, and SOA is becoming
the new architectural pattern for enterprise infrastructures, there are new
and unique architectural challenges that need to be addressed in order to
fully enjoy the capabilities SOA provides.
In order to fully exploit the interoperability that advanced Web Services
provide, a SOA infrastructure must support operational flexibility, a
heterogeneous application environment, scalability to support global
deployment, and the ability to be managed and monitored from a central point.
The enterprise service b... (more)