Welcome!

Weblogic Authors: Yeshim Deniz, Elizabeth White, Michael Meiner, Michael Bushong, Avi Rosenthal

Related Topics: Weblogic

Weblogic: Article

Services-Oriented Architecture and Services-Oriented Development of Applications

A strategy for transition

Proof of Concept (POC)
SODA can provide potential for significant productivity enhancement; however, it is not without its downsides:

  • The lack of current standards for tool support dictates a degree of vendor lock-in.
  • SODA places much of the development burden on tools. This implies that the tool is adept at the generation of lower-level plumbing code that is either completely hidden from the developer or, if available for customization, can be easily maintained.
  • Is the resulting architecture scalable and per formant? Is it extensible?
  • There needs to be significant effort given to training the development staff on the SODA tool(s) chosen. The shift in the process by which one develops software is not insignificant.
A POC is required to demonstrate/prove a SODA approach. This POC must be extensive enough to demonstrate/prove at least the following concepts:
  • Services-based design paradigm shift. We especially need to dig into the various service layers (realize/utilize at least one domain, business, use case, and presentation service).
  • Multi-team development. This includes source control integration and the assignment of specific roles related to SODA (presentation designer, use case designer, business/domain designer, J2EE expert, integration expert, etc.).
  • A use case scenario realization that implements a full vertical slice. It is important that this use case scenario touches on all tiers, including (perhaps especially) the integration tier.
  • Demonstration of the assembly and orchestration of the following service types:
    - Presentation and presentation flow
    - Basic Web services
    - Business process (workflow)
    - Messaging
    - Back-end integration (EAI)
    - Security
  • Integration with lower-level J2EE components
  • Integration with existing functionality
  • Demonstration of the publication, and subsequent look-up/discovery of services and associated metadata (documentation)
  • Demonstration of a development, build, deploy, test, and release cycle
  • Demonstration of service simulations, to show alleviation of dependency bottlenecks
Service-Oriented Architecture and Domain Pluggability
This section discusses the extent to which an SOA can help better enable business domain pluggability. Pluggability, as defined here, is the capability to swap out one domain implementation (business services and associated domain model) and replace it with another. Pluggability requires that the domain implementation only be exposed through well-defined interfaces (the clients of the domain, including other domains, never know about anything but the interfaces). This can be achieved with a component-based approach; however, there are limitations to this: the clients of the domain are generally bound to particular versions of the component interfaces (at least without jumping through reflection/classloader-related hoops or using some sort of brittle JNDI naming convention).

A domain model, generally, is too fine grained to be directly exposed as a set of services. For this reason, any inter-domain relationships realized within the domain model should be kept to a minimum, in order to achieve pluggability with respect to its clients (the domain services). This obviously implies that inter-domain relationships within the data model are likewise kept to a minimum. The domain model is only exposed to the domain services layer. The business devices (if needed) and use case services layers interact with the domain services. Domain services interact with their applicable domain model and convert the fine-grained, object-oriented interface of the model to a coarse-grained, services-oriented interface. See Figure 3 for a conceptual (example) illustration of how these layers might be defined.

Trade-offs
There are always trade-offs to consider when choosing an architectural approach, and moving to an SOA employing SODA is certainly no different. There are many interpretations of what exactly SOA (the concept of which has been around for a great many years) and SODA really mean. For the purposes of this document, services are defined as coarse-grained interfaces that are often generated by a tool and usually talk XML. These services can be, but are certainly not always, exposed as Web services. The services should be dynamically configurable at both design and runtime, so that a particular service can be reused for many different purposes. The service implementations themselves will be a mixture of custom-built and third party. These services are usually layered and are, for the most part, orchestrated into presentations and business processes. Whenever one talks of XML, layering, and dynamic configuration, performance and scalability concerns enter the conversation. Likewise, SODA's great reliance on tools raises discussions on vendor lock-in. Reliance on particular toolsets also raises questions about software builds, change management, and deployment, and how these tools interoperate with the infrastructure currently in place.

Vendor Lock-in
One of the key value prospects of SODA is how tools will enable presentation and business process orchestration, (nearly) seamless XML/native language data transformations, design/runtime service configuration, registration, discovery, etc. All this is possible without any real all-encompassing SODA standards (there are, of course, piece-part standards such as Web services/SOAP, BPEL/BPML, WS-<fill-in-the-blanks>, etc.). This almost guarantees a certain level of vendor lock-in. The degree of vendor lock-in depends on the tools chosen and the use of those tools.

Performance and Scalability
There is often much concern around the impact to both performance and scalability of an application built on a layered, XML-based SOA. There are questions related to the potential overhead in using something as verbose as XML for intra-application communication and the serialization/deserialization potentially required by both client and service in order to translate the XML to the native language object representation(s). Scalability comes into play as more concurrent users, and larger payloads, interact with the application. Much of this can be mitigated via the judicious design of truly coarse-grained services and the enforcement of communication between well-defined service layers only. Limit long-lived state and ensure that operations are asynchronous where appropriate. SODA tools often help mitigate this concern as well by optimizing the XML transformations (or by natively operating on XML within their presentation and business process flows). In the end, though, there will certainly be more overhead and the early incorporation of application profiling under realistic use patterns must be ingrained into the process going forward to determine where optimization and tuning is required.

Build, Change Management, and Deployment
The tools picked must interoperate with the infrastructure currently in place, or provide the extensibility hooks to easily add this interoperability. Interoperability with the current build (usually Ant) and source control systems, and standard J2EE enterprise application packaged deployment units are all requirements.

Summary
The bottom line is that an SOA, built using the latest SODA-based tools, is certainly not a silver bullet (nothing is). A disciplined SOA approach can help to alleviate dependency bottlenecks somewhat, via data/service abstraction and simulation; however, the dependencies, especially at the domain layer, must still be managed. On the other hand, one of the benefits of an SOA is that the higher-level services can be developed relatively independently, thanks to the service and data abstraction. This allows the presentation and business process orchestrations to be developed independently as well.

More Stories By Steve Buzzard

Steve Buzzard is currently working as a J2EE principal architect with Anexinet Corporation (www.anexinet.com), a leading systems integration firm headquartered in Philadelphia, with offices in New York and Washington D.C. Steve has over 19 years of experience in professional software development and has been working almost exclusively with the WebLogic Technology Stack since late 1998.

Comments (0)

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.


@ThingsExpo Stories
No hype cycles or predictions of a gazillion things here. IoT is here. You get it. You know your business and have great ideas for a business transformation strategy. What comes next? Time to make it happen. In his session at @ThingsExpo, Jay Mason, an Associate Partner of Analytics, IoT & Cybersecurity at M&S Consulting, presented a step-by-step plan to develop your technology implementation strategy. He also discussed the evaluation of communication standards and IoT messaging protocols, data...
The 22nd International Cloud Expo | 1st DXWorld Expo has announced that its Call for Papers is open. Cloud Expo | DXWorld Expo, to be held June 5-7, 2018, at the Javits Center in New York, NY, brings together Cloud Computing, Digital Transformation, Big Data, Internet of Things, DevOps, Machine Learning and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding busin...
Smart cities have the potential to change our lives at so many levels for citizens: less pollution, reduced parking obstacles, better health, education and more energy savings. Real-time data streaming and the Internet of Things (IoT) possess the power to turn this vision into a reality. However, most organizations today are building their data infrastructure to focus solely on addressing immediate business needs vs. a platform capable of quickly adapting emerging technologies to address future ...
Nordstrom is transforming the way that they do business and the cloud is the key to enabling speed and hyper personalized customer experiences. In his session at 21st Cloud Expo, Ken Schow, VP of Engineering at Nordstrom, discussed some of the key learnings and common pitfalls of large enterprises moving to the cloud. This includes strategies around choosing a cloud provider(s), architecture, and lessons learned. In addition, he covered some of the best practices for structured team migration an...
With tough new regulations coming to Europe on data privacy in May 2018, Calligo will explain why in reality the effect is global and transforms how you consider critical data. EU GDPR fundamentally rewrites the rules for cloud, Big Data and IoT. In his session at 21st Cloud Expo, Adam Ryan, Vice President and General Manager EMEA at Calligo, examined the regulations and provided insight on how it affects technology, challenges the established rules and will usher in new levels of diligence arou...
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, led attendees through the exciting evolution of the cloud. He looked at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering m...
In his session at 21st Cloud Expo, Raju Shreewastava, founder of Big Data Trunk, provided a fun and simple way to introduce Machine Leaning to anyone and everyone. He solved a machine learning problem and demonstrated an easy way to be able to do machine learning without even coding. Raju Shreewastava is the founder of Big Data Trunk (www.BigDataTrunk.com), a Big Data Training and consulting firm with offices in the United States. He previously led the data warehouse/business intelligence and B...
Recently, REAN Cloud built a digital concierge for a North Carolina hospital that had observed that most patient call button questions were repetitive. In addition, the paper-based process used to measure patient health metrics was laborious, not in real-time and sometimes error-prone. In their session at 21st Cloud Expo, Sean Finnerty, Executive Director, Practice Lead, Health Care & Life Science at REAN Cloud, and Dr. S.P.T. Krishnan, Principal Architect at REAN Cloud, discussed how they built...
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud ...
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud ...
DevOps at Cloud Expo – being held June 5-7, 2018, at the Javits Center in New York, NY – announces that its Call for Papers is open. Born out of proven success in agile development, cloud computing, and process automation, DevOps is a macro trend you cannot afford to miss. From showcase success stories from early adopters and web-scale businesses, DevOps is expanding to organizations of all sizes, including the world's largest enterprises – and delivering real results. Among the proven benefits,...
@DevOpsSummit at Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, is co-located with 22nd Cloud Expo | 1st DXWorld Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait...
Cloud Expo | DXWorld Expo have announced the conference tracks for Cloud Expo 2018. Cloud Expo will be held June 5-7, 2018, at the Javits Center in New York City, and November 6-8, 2018, at the Santa Clara Convention Center, Santa Clara, CA. Digital Transformation (DX) is a major focus with the introduction of DX Expo within the program. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive ov...
SYS-CON Events announced today that T-Mobile exhibited at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. As America's Un-carrier, T-Mobile US, Inc., is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to 67.4 million customers who are unwilling to compromise on qua...
SYS-CON Events announced today that Cedexis will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Cedexis is the leader in data-driven enterprise global traffic management. Whether optimizing traffic through datacenters, clouds, CDNs, or any combination, Cedexis solutions drive quality and cost-effectiveness. For more information, please visit https://www.cedexis.com.
SYS-CON Events announced today that Google Cloud has been named “Keynote Sponsor” of SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Companies come to Google Cloud to transform their businesses. Google Cloud’s comprehensive portfolio – from infrastructure to apps to devices – helps enterprises innovate faster, scale smarter, stay secure, and do more with data than ever before.
SYS-CON Events announced today that Vivint to exhibit at SYS-CON's 21st Cloud Expo, which will take place on October 31 through November 2nd 2017 at the Santa Clara Convention Center in Santa Clara, California. As a leading smart home technology provider, Vivint offers home security, energy management, home automation, local cloud storage, and high-speed Internet solutions to more than one million customers throughout the United States and Canada. The end result is a smart home solution that sav...
SYS-CON Events announced today that Opsani will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Opsani is the leading provider of deployment automation systems for running and scaling traditional enterprise applications on container infrastructure.
SYS-CON Events announced today that Nirmata will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Nirmata provides a comprehensive platform, for deploying, operating, and optimizing containerized applications across clouds, powered by Kubernetes. Nirmata empowers enterprise DevOps teams by fully automating the complex operations and management of application containers and its underlying ...
SYS-CON Events announced today that Opsani to exhibit at SYS-CON's 21st Cloud Expo, which will take place on October 31 through November 2nd 2017 at the Santa Clara Convention Center in Santa Clara, California. Opsani is creating the next generation of automated continuous deployment tools designed specifically for containers. How is continuous deployment different from continuous integration and continuous delivery? CI/CD tools provide build and test. Continuous Deployment is the means by which...