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ادامه دارد …
Just what the hell is a service-oriented architecture?
SOA?
It stands for service-oriented architecture. Sometimes people talk about SOAs, even pronouncing it as a word.
Oh great, another alphabet soup acronym to confuse us all. Give me the 35,000ft view. And why should I care?
SOA actually does what it says on the tin. It’s an IT architecture based around common platforms, protocols and reusable code. It can be used to support and connect services and business processes across an enterprise.
Eh? Come again, in English this time please…
SOA is essentially a collection of loosely coupled functions across the IT infrastructure – internal and external – that communicate with each other to provide a particular service or business process.
And why’s that good?
The alternative is to stay with siloed, standalone applications that can’t easily talk to each other. Non-SOA applications are designed to carry out fairly specific functions and the code in them is often not easily reusable. To modify and customise them so they can talk to other applications becomes costly and complex.
OK, I think I get that but give me an example of how it actually works in practice.
One real-world example is the London Stock Exchange, which has used an SOA to enable its systems to communicate directly with those of the various financial firms it must work with. Other hypothetical examples might be the bank that has grown by one acquisition after another – for example allowing the systems of its retail banking, insurance and mortgage arms to speak with each other and a common CRM system – that uses the SOA middleware layer to pull information from the various legacy systems. Or the travel agent that uses SOA to allow its customers to book cars from a separate car rental company.
Sounds like the web services promise of five years ago. Isn’t that all SOA is?
That’s a common misconception. The SOA approach has actually been around for more than a decade but it’s only started to come into more widespread use in businesses now because of the standard technologies, protocols and languages associated with web services, especially XML. To put it simply, web services is the connectivity that enables various applications or functions in an enterprise to plug in and talk to each other and provide the ’service’ in SOA.
What are the other benefits of a service-oriented architecture?
By reusing the functionality in applications instead of developing lots of standalone apps it cuts development costs as well as simplifying an enterprise’s IT infrastructure and making it much more flexible and agile. In an SOA, services can be quickly adapted to new or changing business processes where previously it might have meant completely redesigning existing applications or buying in expensive new packages.
And how does this all differ from another annoying TLA: EAI – enterprise application integration?
Good question. There are plenty of vendors and IT services players out there for whom the distinction is blurred. They are two approaches towards the same goal, in many cases, if we harp back to – say – the above example of a bank trying to get a single view of a customer, a single version of the truth, as they say. In outcomes EAI bears some similarity to SOA but they are not the same thing.
Is it easy to implement an SOA?
No it isn’t and some analysts predict that doing so will eat up 40 per cent of your IT budget. Gartner says that by 2008 SOA will be the prevailing software engineering practice and warns that organisations which haven’t started on the SOA path by then will be placing themselves at a competitive disadvantage.
Is that something users see?
Put it this way, in a recent silicon.com CIO Jury two-thirds of respondents said they have already moved or are planning to move to an SOA platform. Financial services companies in particular seemed pretty excited and generally there was a view that SOA equals greater agility. Those who weren’t smitten pointed to “more marketing over substance”
by:Andy McCue
source: www.silicon.com
‘Has anybody seen my big box of CDs… ?’
Software? As a service? I don’t understand…
نرم افزار؟ به جای سرویس ؟ متوجه نمی شم …
You’re not the only one. What we’re talking about here is the use of ’software’ (for want of a better word) that is accessed via your browser. You may variously hear this model referred to as ‘on-demand’ or ‘hosted’. This is because it is hosted by the service provider, rather than being installed on your own PC, or within your own office. So this means you just fire up your browser and log in. No install, no hassle, no management overhead – that’s the theory.
And does the theory work in practice?
و آیا این تئوری در واقعیت عملی می شه؟
By and large, yes it does – though there are still relatively few companies making a real name for themselves in this space compared to the real big names who are still shipping box-loads of CDs with software the user must install.
You say “by and large” as if there are still some problems…
تو گفتی ” معمولا ” . این یعنی هنوز مشکلی وجود داره ؟
There are always problems. But the vendors in the software as a service (SaaS) market will tell you their problems are slighter than those faced by customers of on-premise solutions. However, issues such as downtime have arisen. However, computers fail – we all know this – and the SaaS vendors claim they would not trade their uptime for that of their users’ servers and computers. Likewise there are some concerns about security – do users really want important data outside of their own four walls? Again though the SaaS vendors will tell their users the security they have in place is better than anything the user has – given the economies of scale – protecting thousands of customers, and a reputation, rather than just one business.
However, the on-premise vendors maintain SaaS simply will not fly with some businesses which have a guarded attitude to their data and this may prove to be true – or at least for the foreseeable future.
And also, don’t forget you have to be online if you really want to get the most out of your hosted solution. Internet access is pretty ubiquitous now but it can’t be taken for granted. A system is only as good as its weakest link, so a company bedevilled by downtime on its internet access, or one that has been slow to ensure staff have multiple channels of internet access and an always-on capability, might struggle.
So what kind of software are we talking?
ما درباره چه نوع نرم افزار هایی داریم صحبت می کنیم ؟
To date a lot of the innovation we’ve seen in this space has been in the world of customer relationship management (CRM) and business apps such as enterprise resource planning (ERP) and…
Whoa there! You’re losing me…
اوه ! تو داری منو گیج می کنی !
OK, so beyond those very business-focused areas there are all manner of other applications – some of which you probably know better than you think. Applications such as Writely.com – which was bought by Google – and offers an application that looks and feels a little like Microsoft Word. It is hosted by Google, meaning you can access it and continue working on your document whether you are in your office or working on a strange PC in an internet café in Tibet. This is what they mean by on-demand. And because it is online and exists normally in just one version, collaboration is also a lot easier. No more emailing somebody to find out which version of a software program they are using before swapping files. Similarly there are on-demand offerings out there that will offer users a hosted alternative to Microsoft exchange, outlook calendar, Excel…
I’m spotting a trend here. Should Microsoft be worried?
خب من اینجا یه چیزی فهمیدم ! آیا ماکروسافت باید نگران این موضوع باشه؟
Back in the days when the on-demand vendors were very small fish in a huge pond, Bill Gates pretty much laughed off the idea that the CDs which built this house would one day no longer be shipped. Now the company he founded is preparing its own partially hosted offerings – representing something slightly more considerable than dipping a toe in the SaaS waters.
Similarly companies such as Oracle – owner of Siebel – and SAP are also rolling out their own SaaS offerings – in part to combat the grinding effect the likes of Salesforce.com – regarded as the flagship of the SaaS movement – are having on their new business revenues.
Any other benefits?
و دیگر منفعت ها؟
There are, though this is an issue businesses must consider for themselves on a case by case basis. However, there is a major boon for the vendors: no CDs, no piracy – suggesting others will see the sense in moving in this direction. So in parts of the world where piracy is rife – such as China and the Far East, where it is estimated more than 75 per cent of software is counterfeit, SaaS becomes a compelling alternative. As those countries come online and the demand for increasingly sophisticated business software grows, expect the SaaS vendors to be near the front of the queue.
So this is definitely happening then?
آیا این به طور واضح داره اتفاق می افته ؟
Count on it. Analysts have mixed feelings about the growth of SaaS but the only real differences they see are in just how quickly it might grow. Some, such as Gartner say a quarter of all business software revenues will go to SaaS offerings within five years. Others say that will be the case within a couple of years. It’s definitely a boom area
source: www.silicon.com
تاسیس شرکت اپل – سه شنبه، ۱۳ فروردین ۱۳۸۷ »
تاسیس شرکت مایکروسافت – آدینه، ۱۶ فروردین ۱۳۸۷ »
ثبت دامنه IR – یکشنبه، ۱۸ فروردین ۱۳۸۷ »
آغاز بکار سرویس بلاگ اسکای – سه شنبه، ۲۰ فروردین ۱۳۸۷ »
انتشار توزیع لینوکس کوبونتو – سه شنبه، ۲۰ فروردین ۱۳۸۷ »
انتشار نسخه ۸.۰۴ ابونتو – پنجشنبه، ۵ اوردیبهشت ۱۳۸۷ »
انتشار ویندوز سرور ۲۰۰۳ – پنجشنبه، ۵ اوردیبهشت ۱۳۸۷ »
Google Maps Street View – یکشنبه، ۵ خورداد ۱۳۸۷ »
آغاز بکار وبسایت راپیدشر – سه شنبه، ۷ خورداد ۱۳۸۷ »
تاسیس سرویس پرشین بلاگ – پنجشنبه، ۲۳ خورداد ۱۳۸۷ »
کیش - بازار پردیس 2 اینترنت wi-fi – هوای ملس – وب گردی با هدف پیدا کردن مطلب برای مقاله ام … >> دارم درباره SOA یه چبزایی می نویسم .
تو گشت و گذار ها یه لینک یافتم درباره WSDL که زبان توصیف سرویس های وب هست . یه کتابه !
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