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    <p>From my point of view and after 4 years of experience with SOA technologies, using an ESB will always overload the system since you are adding a new layer and making all your communications go through it. Transformation (either messaging or protocol) and routing aren't to hard to accomplish without an ESB and point to point communication will have a bit higher throughput. Same happens also with business process automation, there are ways to get there without the need of an ESB.</p> <p>In the other hand, the use of an ESB has several benefits in the scope of a corporation but it must be within a vision and strategy. One of the best examples is a company that has been working for a long time with a wide range of tools, each of them for a specific purpose and that made the company be distributed in teams which work in silos, ones isolated from the others. After a long time that makes interaction between teams complex and slow. A well planned SOA strategy will help to integrate all those tools and start replacing them for more meaningful lightweight items.</p> <p>So, IMHO, Using an ESB just to solve a couple of "issues" in a single project without a corporate strategy isn't a good idea and, eventually, the word <strong>SOA</strong> will be banned in your company, when the problem isn't SOA by itself by rather the lack of vision and corporate strategy.</p> <p>The only <em>rule of thumb</em> that I found regarding the use of ESBs is: The requirement of transformation, routing, business process automation (with or without human interaction), etc. in a single project is not a symptom of going SOA (almost every project has to perform transformations, routing and business process automation), but when those needs are the ones for a whole corporation then it's worth to think about it from a business point of view, never a technical one. If there isn't a business perspective, then SOA will fail.</p> <p>This is a really wide topic and discussion can last for ages, I will suggest you a couple of links for further reading:</p> <ul> <li>Some <a href="http://www.soa-consortium.org/case-study.htm" rel="noreferrer">SOA Case Studies</a></li> <li><a href="http://www.cio.com/article/438413/Top_10_Reasons_Why_People_are_Making_SOA_Fail" rel="noreferrer">Top 10 Reasons why SOA fails</a></li> </ul>
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