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StackOverflow2013
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    <p>There may not be one solution/off-the-shelf component that might help you. </p> <p><strong>Problem 1:</strong><br> The basic problem can be solved via an ESB, as it provides <em>location transparency</em> and <em>service aggregation</em>. A regular ESB <strong>mediates/brokers</strong> requests between service consumer and service provider.<br> Take a simple example:</p> <blockquote><pre>Service_A depends on Service_B Service_C depends on Service_B Service_B depends on Service_D </pre></blockquote> <p>In this scenario, the best way to progress is this: </p> <ol> <li>Define contracts exposed by <code>Service_B</code> and <code>Service_D</code> as <em>external dependencies</em> (possibly as a web service, though an ESB supports multiple protocols) in services <code>Service_A</code>, <code>Service_C</code> and <code>Service_B</code>, and consume via an ESB. </li> <li>In ESB, to start with, route thes services <code>Service_B</code> and <code>Service_D</code> on the same instance. </li> <li>If you migrate <code>Service_D</code> and <code>Service_B</code> as <code>Service_Dx</code> and <code>Service_Bx</code> on a different location, the ESB can be reconfigured to route to the new location. Also, an ESB can be configured to route to <code>Service_B</code> or <code>Service_Bx</code> based on some set of parameters (eg., test data to <code>Service_B</code> and production data to <code>Service_Bx</code>)</li> </ol> <p><strong>Problem 2:</strong><br> The problem of IOC could probably be hard to achieve; there may not be a need.<br> I presume the clients, instead of consuming from a known location, are injected with the whereabouts of service location. This in reality transfers the configuration to client side. With this, for every new client added to the system there needs to be a separate configuration control. This might lead to logistical issues.</p> <p><em>Please post your final solution, very interested to know your approach.</em></p>
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    1. POAbstracting out existence of service bus/distributed messaging?
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    1. COJust as a follow-up -- this part of my project got tabled and is still that way. If/when we pick it back up, I'll follow up.
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    2. CO@Joe, Unfortunately, every day more and more large SOA-tools/ESB based enterprise projects are tabled. Not good sign: indicates lack of funds in IT departments...
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