Today, we present a sponsored podcast discussion on the resurgent role of service-oriented architecture (SOA) and how its benefits are being revisited as practical and relevant in the cloud, mobile, and big-data era.
We've gathered an international panel of experts to explore the concept of "architecture is destiny," especially when it comes to hybrid services delivery and management. We'll see how SOA is proving instrumental in allowing the needed advancements over highly distributed services and data, when it comes to scale, heterogeneity support, and governance.
Here to share his insights on the back-to-the-future role and practicality of SOA is Chris Harding, Director of Interoperability at The Open Group. He's based in the UK. Welcome, Chris. [Disclosure: The Open Group is a sponsor of BriefingsDirect podcasts.]
Chris Harding: Hi, Dana. It's great to be on this panel.
Gardner: We're also here with Nikhil Kumar, President of Applied Technology Solutions and Co-Chair of the SOA Reference Architecture Projects within The Open Group, and he is based in Michigan.
Nikhil Kumar: Hello, Dana. I'm looking forward to being on the panel and participating.
Gardner: We're also here with Mats Gejnevall, Enterprise Architect at Capgemini and Co-Chair of The Open Group SOA Work Group, and he's based in Sweden. Thanks for joining us, Mats.
Mats Gejnevall: Thanks, Dana.
Gardner: All right, Chris, tell me little bit about this resurgence that we've all been noticing in the interest around SOA.
Harding: My observation is from a slightly indirect perspective. My role in The Open Group is to support the work of our members on SOA, cloud computing, and other topics. We formed the SOA Work Group back in 2005, when SOA was a real emerging hot topic, and we set up a number of activities and projects. They're all completed.
I was thinking that the SOA Work Group would wind down, move into maintenance mode, and meet once every few months or so, but we still get a fair attendance at our regular web meetings. In fact, we've started two new projects and we're about to start a third one. So from that, as I said, indirect observation, it's very clear that there is still an interest, and indeed a renewed interest, in SOA from the IT community within The Open Group.
Gardner: Nikhil, do you believe that this has to do with some of the larger trends we're seeing in the field, like cloud Software as a Service (SaaS), and hybrid services? From your perspective, is this what's driving this renewal?
Kumar: What I see driving it is three things. One is the advent of the cloud and mobile, which requires a lot of cross-platform delivery of consistent services. The second is emerging technologies, mobile, big data, and the need to be able to look at data across multiple contexts.
The third thing that’s driving it is legacy modernization. A lot of organizations are now a lot more comfortable with SOA concepts. I see it in a number of our customers. I've just been running a large enterprise architecture initiative in a Fortune 500 customer.
At each stage, and at almost every point in that, they're now comfortable. They feel that SOA can provide the ability to rationalize multiple platforms. They're restructuring organizational structures, delivery organizations, as well as targeting their goals around a service-based platform capability.
So legacy modernization is a back-to-the-future kind of thing that has come back and is getting adoption. The way it's being implemented is using RESTful services, as well as SOAP services, which is different from traditional SOA, say from the last version, which was mostly SOAP-driven.
Gardner: Mats, do you think that what's happened is that the marketplace and the requirements have changed and that’s made SOA more relevant? Or has SOA changed to better fit the market? Or perhaps some combination?
Gejnevall: I think that the cloud is really a service delivery platform. Companies discover that to be able to use the cloud services, the SaaS things, they need to look at SOA as their internal development way of doing things as well. They understand they need to do the architecture internally, and if they're going to use lots of external cloud services, you might as well use SOA to do that.
Also, if you look at the cloud suppliers, they also need to do their architecture in some way and SOA probably is a good vehicle for them. They can use that paradigm and also deliver what the customer wants in a well-designed SOA environment.
Gardner: Let's drill down on the requirements around the cloud and some of the key components of SOA. We're certainly seeing, as you mentioned, the need for cross support for legacy, cloud types of services, and using a variety of protocol, transports, and integration types. We already heard about REST for lightweight approaches and, of course, there will still be the need for object brokering and some of the more traditional enterprise integration approaches.
This really does sound like the job for an Enterprise Service Bus (ESB). So let's go around the panel and look at this notion of an ESB. Some people, a few years back, didn’t think it was necessary or a requirement for SOA, but it certainly sounds like it's the right type of functionality for the job. Do you agree with that, Chris?
Harding: I believe so, but maybe we ought to consider that in the cloud context, you're not just talking about within a single enterprise. You're talking about a much more loosely coupled, distributed environment, and the ESB concept needs to take account of that in the cloud context.
Gardner: Nikhil, any thoughts about how to manage this integration requirement around the modern SOA environment and whether ESBs are more or less relevant as a result?
Kumar: In the context of a cloud we really see SOA and the concept of service contracts coming to the fore. In that scenario, ESBs play a role as a broker within the enterprise. When we talk about the interaction across cloud-service providers and cloud consumers, what we're seeing is that the service provider has his own concept of an ESB within its own internal context.
If you want your cloud services to be really reusable, the concept of the ESB then becomes more for the routing and the mediation of those services, once they're provided to the consumer. There's a kind of separation of concerns between the concept of a traditional ESB and a cloud ESB, if you want to call it that.
The cloud context involves more of the need to be able to support, enforce, and apply governance concepts and audit concepts, the capabilities to ensure that the interaction meets quality of service guarantees. That's a little different from the concept that drove traditional ESBs.
That’s why you're seeing API management platforms like Layer 7, Mashery, or Apigee and other kind of product lines. They're also coming into the picture, driven by the need to be able to support the way cloud providers are provisioning their services. As Chris put it, you're looking beyond the enterprise. Who owns it? That’s where the role of the ESB is different from the traditional concept.
Gardner: Do you think there is a security angle to that as well or at least access and privilege types of controls?
Kumar: Absolutely. Most cloud platforms have cost factors associated with locality. If you have truly global enterprises and services, you need to factor in the ability to deal with safe harbor issues and you need to factor in variations and law in terms of security governance.
The platforms that are evolving are starting to provide this out of the box. The service consumer or a service provider needs to be able to support those. That's going to become the role of their ESB in the future, to be able to consume a service, to be able to assert this quality-of-service guarantee, and manage constraints or data-in-flight and data-at-rest.
Gardner: Mats, it sounds as if the ESB, as Nikhil is describing it, would be more of an intermediary between the internal organization and external services. Does that jibe with what you're seeing in the market, or are there other aspects of the concept of ESB that are now relevant to the cloud?
Gejnevall: One of the reasons SOA didn’t really take off in many organizations three, four, or five years ago was the need to buy the entire stack of SOA products that all the consultancies were asking companies to buy, wanting them to buy an ESB, governance tools, business process management tools, and a lot of sort of quite large investments to just get your foot into the door of doing SOA.
These days you can buy that kind of stuff. You can buy the entire stack in the cloud and start playing with it. I did some searches on it today and I found a company that you can play with the entire stack, including business tools and everything like that, for zero dollars. Then you can grow and use more and more of it in your business, but you can start to see if this is something for you.
In the past, the suppliers or the consultants told you that you could do it. You couldn’t really try it out yourself. You needed both the software and the hardware in place. The money to get started is much lower today. That's another reason people might be thinking about it these days.
Gardner: It sounds as if there's a new type of on-ramp to SOA values, and the componentry that supports SOA is still being delivered as a service. On top of that, you're also able to consume it in a pay-as-you-go manner. Do you agree, Chris Harding, that there's a new type of on-ramp to SOA now that might be part of this resurgence?
Harding: That's a very good point, but there are two contradictory trends we are seeing here. One is the kind of trend that Mats is describing, where the technology you need to handle a complex stack is becoming readily available in the cloud.
And the other is the trend that Nikhil mentioned: to go for a simpler style, which a lot of people term REST, for accessing services. It will be interesting to see how those two tendencies play out against each other.
Kumar: I'd like to make a comment on that. The approach for the on-ramp is really one of the key differentiators of the cloud, because you have the agility and the lack of capital investment (CAPEX) required to test things out.
But as we are evolving with cloud platforms, I'm also seeing with a lot of Platform-as-a-Service (PaaS) vendor scenarios that they're trying the ESB in the stack itself. They're providing it in their cloud fabric. A couple of large players have already done that.
Gardner: I guess we could rethink that as Integration as a Service. Does that make sense?
Kumar: Yes. For example, Azure provides that in the forward-looking vision. I am sure IBM and Oracle have already started down that path. A lot of the players are going to provide it as a core capability.
Gejnevall: Another interesting thing is that they could get a whole environment that's pre-integrated. Usually, when you buy these things from a vendor, a lot of times they don't fit together that well. Now, there’s an effort to make them work together.
But some people put these open-source tools together. Some people have done that and put them out on the cloud, which gives them a pretty cheap platform for themselves. Then, they can sell it at a reasonable price, because of the integration of all these things.
Gardner: There seem to be a couple of different approaches in the market. One would be the à-la-carte approach, perhaps most popularized by Amazon Web Services (AWS), where you can just get discrete Infrastructure-as-a-Service (IaaS) componentry or granular approaches.
There's also the move toward a fuller stack of integrated services that would work in total, perhaps even across a lifecycle of software, from development, to deployment, to advancement, into integration and process.
Any thoughts from the panel on these two approaches? Will there be more à la carte or more integration? I guess it depends on the organization how they want to consume this. Chris?
Harding: There are two different approaches for the architect to choose between. You can go for the basic IaaS from Amazon. You can put stack onto it. Maybe you can get open-source products and put them onto that stack. That will give you the kind of platform on which you're going to deploy your services.
Or you can go for PaaS with a platform ready there and integrate it. If you go for the PaaS already there and integrate it, then you should watch out for how far you're locked into that particular cloud provider, because you're using special services in that platform.
Gejnevall: It's an important issue there, because what happens if you buy the whole stack in the cloud somewhere? It's done by very specific tools that you can't move into your own environment later on, and that cloud supplier goes under, and suddenly you're in a pretty bad shape. You need to make sure that the stuff that you're using out there are things that you can actually bring home and use at home as well.
Gardner: Nikhil, it sounds as if the cloud model might be evolving toward what is all-inclusive, at least a lot of people would like to provide that. But SOA, I think by its nature and its definition, advances an ocean of interoperability, and being able to plug and play across existing, current, and then future sets of service possibilities. Are we talking about SOA being an important element of keeping clouds dynamic and flexible?
Kumar: We can think about the OSI 7 Layer Model. We're evolving in terms of complexity, right? So from an interoperability perspective, we may talk SOAP or REST, for example, but the interaction with AWS, Salesforce, SmartCloud, or Azure would involve using APIs that each of these platforms provide for interaction.
So you could have an AMI, which is an image on the Amazon Web Services environment, for example, and that could support a lab stack or an open source stack. How you interact with it, how you monitor it, how you cluster it, all of those aspects now start factoring in specific APIs, and so that's the lock-in.
From an architect’s perspective, I look at it as we need to support proper separation of concerns, and that's part of [The Open Group] SOA Reference Architecture. That's what we tried to do, to be able to support implementation architectures that support that separation of concerns.
There's another factor that we need to understand from the context of the cloud, especially for mid-to-large sized organizations, and that is that the cloud service providers, especially the large ones -- Amazon, Microsoft, IBM -- encapsulate infrastructure.
If you were to go to Amazon, Microsoft, or IBM and use their IaaS networking capabilities, you'd have one of the largest WAN networks in the world, and you wouldn’t have to pay a dime to establish that infrastructure. Not in terms of the cost of the infrastructure, not in terms of the capabilities required, nothing. So that's an advantage that the cloud is bringing, which I think is going to be very compelling.
The other thing is that, from an SOA context, you're now able to look at it and say, "Well, I'm dealing with the cloud, and what all these providers are doing is make it seamless, whether you're dealing with the cloud or on-premise." That's an important concept.
Now, each of these providers and different aspects of their stacks are at significantly different levels of maturity. Many of these providers may find that their stacks do not interoperate with themselves either, within their own stacks, just because they're using different run times, different implementations, etc. That's another factor to take in.
From an SOA perspective, the cloud has become very compelling, because I'm dealing, let's say, with a Salesforce.com and I want to use that same service within the enterprise, let's say, an insurance capability for Microsoft Dynamics or for SugarCRM. If that capability is exposed to one source of truth in the enterprise, you've now reduced the complexity and have the ability to adopt different cloud platforms.
What we are going to start seeing is that the cloud is going to shift from being just one à-la-carte solution for everybody. It's going to become something similar to what we used to deal with in the enterprise context. You had multiple applications, which you service-enabled to reduce complexity and provide one service-based capability, instead of an application-centered approach.
You're now going to move the context to the cloud, to your multiple cloud solutions, and maybe many implementations in a nontrivial environment for the same business capability, but they are now exposed to services in the enterprise SOA. You could have Salesforce. You could have Amazon. You could have an IBM implementation. And you could pick and choose the source of truth and share it.
So a lot of the core SOA concepts will still apply and are still applying.
Gardner: Mats, it sounds that with this vision of a cloud of clouds and increasingly services being how you manage that diversity, getting competency at SOA now will put you in a much better position to be able to exploit and leverage these cloud services as we go forward. Does that make sense?
Gejnevall: Absolutely, but the governance issue pops up here all the time as well, because if you are going to use lots of services out there, you want to have some kind of control. You might want to have a control over your cloud suppliers. You don't want to start up a lot of shadow IT all over your enterprise. You still want to have some kind of control.
An idea that is popping up now is that, instead of giving the business direct access to all these cloud suppliers, you probably have to govern those services and look at governance features. You can measure the usage of all these external SaaS things, and then if you don't like the supplier and you can't negotiate the right price, you just move to another supplier that supplies a similar type of service.
This works fine in SOA and SaaS context, but it's much harder to do that from a PaaS or IaaS. From the SaaS point of view, you really need to get control over those services, because otherwise the business is going to go wild. Then, you buy new stuff all over the place, and suddenly they die out and then the business stops working, and there is no control over that.
Gardner: Chris Harding, another pillar of SOA traditionally has been the use of registry and repositories to help manage some of that chaos that Mats was referring to. We've also seen a lot of interest in the concept of the app store, popularized by Apple with its iOS interfaces and its application buying and managing. Are we seeing a need for app stores in the enterprise that are, in a sense, the registry and repository of SOA?
Harding: The app store concept is coming in, in several forms and it seems to be meeting a number of different needs.
Yes, you have the app stores that cloud vendors have to let people pick from their product. You have the government app stores organized to enable government departments to get a good choice of cloud services. In some ways, they're taking over from the idea of the registry and the repository, or doing some of the functions.
In particular, the idea that you used to have of service discovery, of automatically going out and discovering services, is being replaced by the concept of selecting services from app stores. But, of course, there is a fundamental difference between the app store, which is something that you get your service from, and the registry that you keep, which is the registry of the services that you have got from wherever.
Gardner: It does seem important for the governance.
Gejnevall: I also think that the concept of the app stores has taught a lot of business people to use this kind of thinking. I have this huge list of things that I can do within my business. Now with the smartphones, they used to go and search for that and see what kind of stuff can I do with the IP I've got in my business. By providing similar kinds of things to the business people, they can go and search and see that these are other things I can do within my business. You can download them on your laptop, your phone, or whatnot.
That will change the relationship a bit between the business side and the IT side of things.
Gardner: Perhaps yet another on-ramp to the use of SOA types of models and thinking, the app store allowing for discovery, socialization of services, but at the same time, providing governance and control, because the organization can decide what app store you use, what apps get in the store, or what app stores are available.
Kumar: I have a few comments on that, because we're seeing that with a lot of our customers, typically the vendors who support PaaS solution associate app store models along with their platform as a mechanism to gain market share.
The issue that you run into with that is, it's okay if it's on your cellphone or on your iPad, your tablet PC, or whatever, but once you start having managed apps, for example Salesforce, or if you have applications which are being deployed on an Azure or on a SmartCloud context, you have high risk scenario. You don't know how well architected that application is. It's just like going and buying an enterprise application.
When you deploy it in the cloud, you really need to understand the cloud PaaS platform for that particular platform to understand the implications in terms of dependencies and cross-dependencies across apps that you have installed. They have real practical implications in terms of maintainability and performance. We've seen that with at least two platforms in the last six months.
Governance becomes extremely important. Because of the low CAPEX implications to the business, the business is very comfortable with going and buying these applications and saying, "We can install X, Y, or Z and it will cost us two months and a few million dollars and we are all set." Or maybe it's a few hundred thousand dollars.
They don't realize the implications in terms of interoperability, performance, and standard architectural quality attributes that can occur. There is a governance aspect from the context of the cloud provisioning of these applications.
There is another aspect to it, which is governance in terms of the run-time, more classic SOA governance, to measure, assert, and to view the cost of these applications in terms of performance to your infrastructural resources, to your security constraints. Also, are there scenarios where the application itself has a dependency on a daisy chain, multiple external applications, to trace the data?
In terms of the context of app stores, they're almost like SaaS with a particular platform in mind. They provide the buyer with certain commitments from the platform manager or the platform provider, such as security. When you buy an app from Apple, there is at least a reputational expectation of security from the vendor.
What you do not always know is if that security is really being provided. There's a risk there for organizations who are exposing mission-critical data to that.
The second thing is there is still very much a place for the classic SOA registries and repositories in the cloud. Only the place is for a different purpose. Those registries and repositories are used either by service providers or by consumers to maintain the list of services they're using internally.
There are two different paradigms. The app store is a place where I can go and I know that the gas I am going to get is 85 percent ethanol, versus I also have to maintain some basic set of goods at home to make that I have my dinner on time. These are different kind of roles and different kind of purposes they're serving.
Above all, I think the thing that's going to become more and more important in the context of the cloud is that the functionality will be provided by the cloud platform or the app you buy, but the governance will be a major IT responsibility, right from the time of picking the app, to the time of delivering it, to the time of monitoring it.
Gardner: It's a very interesting topic. Chris Harding, tell me a little bit about how The Open Group is allowing architects to better exercise SOA principles, as they're grappling with some of these issues around governance, hybrid services delivery and management, and the use and demand in their organizations to start consuming more cloud services?
Harding: The architect’s primary concern, of course, has to be to meet the needs of the client and to do so in a way that is most effective and that is cost-effective. Cloud gives the architect a usability to go out and get different components much more easily than hitherto.
There is a problem, of course, with integrating them and putting them together. SOA can provide part of the solution to that problem, in that it gives a principle of loosely coupled services. If you didn’t have that when you were trying to integrate different functionality from different places, you would be in a real mess.
What The Open Group contributes is a set of artifacts that enable the architect to think through how to meet the client’s needs in the best way when working with SOA and cloud.
For example, the SOA Reference Architecture helps the architect understand what components might be brought into the solution. We have the SOA TOGAF Practical Guide, which helps the architect understand how to use TOGAF in the SOA context.
We're working further on artifacts in the cloud space, the Cloud Computing Reference Architecture, a notational language for enabling people to describe cloud ecosystems on recommendations for cloud interoperability and portability. We're also working on recommendations for cloud governance to complement the recommendations for SOA governance, the SOA Governance Framework Standards that we have already produced, and a number of other artifacts.
The Open Group’s real role is to support the architect and help the architect to better meet the needs of the architect client.
Gardner: Very good. And perhaps just quickly Chris, you could fill us in as a recap of some of the SOA activities at your recent Washington D.C. Conference.
New SOA activities
Harding: We're looking at some new SOA activities. In fact, we've started an activity to look at SOA for business technology. From the very early days, SOA was seen as bringing a closer connection between the business and technology. A lot of those promises that were made about SOA seven or eight years ago are only now becoming possible to fulfill, and that business front is what that project is looking at.
We're also producing an update to the SOA Reference Architectures. We have input the SOA Reference Architecture for consideration by the ISO Group that is looking at an International Standard Reference Architecture for SOA and also to the IEEE Group that is looking at an IEEE Standard Reference Architecture.
We hope that both of those groups will want to work along the principles of our SOA Reference Architecture and we intend to produce a new version that incorporates the kind of ideas that they want to bring into the picture.
We're also thinking of setting up an SOA project to look specifically at assistance to architects building SOA into enterprise solutions.
So those are three new initiatives that should result in new Open Group standards and guides to complement, as I have described already, the SOA Reference Architecture, the SOA Governance Framework, the Practical Guides to using TOGAF for SOA.
We also have the Service Integration Maturity Model that we need to assess the SOA maturity. We have a standard on service orientation applied to cloud infrastructure, and we have a formal SOA Ontology.
Those are the things The Open Group has in place at present to assist the architect, and we are and will be working on three new things: version 2 of the Reference Architecture for SOA, SOA for business technology, and I believe shortly we'll start on assistance to architects in developing SOA solutions.
Gardner: Very good. I'm afraid we'll have to leave it there. We're about out of time. We've been talking about how SOA is proving instrumental in allowing the needed advancements over highly distributed services and data, especially when it comes to the scale, heterogeneity support, and governance requirements of cloud computing.
Please join me now in thanking our panel. Chris Harding, Director of Interoperability for The Open Group. Thanks so much, Chris.
Harding: Thank you very much, Dana.
Gardner: We're also here with Nikhil Kumar, President of Applied Technology Solutions and Co-Chair of the SOA Reference Architecture Project within The Open Group. Thank you so much.
Kumar: Thank you, Dana.
Gardner: And Mats Gejnevall, Enterprise Architect at Capgemini and Co-Chair of The Open Group SOA Work Group. Thanks, Mats.
Gejnevall: Thanks, Dana. It was an interesting discussion.
Gardner: This is Dana Gardner, Principal Analyst at Interarbor Solutions. Thanks to you also, our audience for listening, and come back next time.
Transcript of a BriefingsDirect panel discussion on how SOA principles are becoming cheaper and easier to implement as enterprises move to the cloud. Copyright The Open Group and Interarbor Solutions, LLC, 2005-2012. All rights reserved.
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