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POHow to implement Monitoring the right way in a SOA DDD Environment?
 

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  1. POHow to implement Monitoring the right way in a SOA DDD Environment?
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    <p>We try to follow SOA and DDD principles in our project. We use NServicebus as messaging bus. So far we have 20+ services.</p> <p>How do you guys set up monitoring (i'm not talking about technical monitoring - like is service "xyz" reachable - is the hard disk full) ?</p> <p><strong>For example</strong></p> <p>If an Order is placed and the shipping is done 5 days later but it should have been executed after 1 day ... that's an error condition.</p> <p>Or another example: The shipping is done. Now we send an electronic invoice to our customer. We must archive that invoice and talk asynchronously with a third party (archiving provider) to retrieve our invoice. If that invoice is not retrieved after 5 days ... that's an error condition.</p> <p>I have problems when defining HOW to model criterias on what is an error and WHERE to put these criterias.</p> <p><strong>WHERE ...</strong></p> <p>... do you set up Monitoring rules ?</p> <p>Are monitoring rules part of your bounded context ? I think yes.<br> Are monitoring rules directly related to an entity ? I think no.<br> Are monitoring rules directly related to an aggregate ? I think no. </p> <p>Monitoring rules are like Domain-Services that span multiple aggregates but as opposed to domain services can also span multiple bounded contexts.</p> <p>Who is reponsible ?</p> <p><strong>HOW ...</strong></p> <p>... do you set up Monitoring rules in code ?</p> <p>If you want to do it right its a really great deal of effort. Otherwise you could do it really cheap (make some queries here and there) but thats against SOA (the major part i'm concerned about)</p> <p>Please guide me to a clear and easy to implement solution.</p> <p>I'm also really excited to learn how you set this up.</p>
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    1. USStephan Schinkel
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    1. COSeems like you talking about long lived processes. Did you try sagas? From your description of problem I can see nice place for sagas in your application - "monitoring rules". :)
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    2. COsagas are used in wide areas of our services. the problem is: where are monitoring rules defined. but it seems that ddd doesn't see them as a separate unit to concern about but as a hard requirement build inside of the domain. so yes this seems to be the answer but a simpler solution would be much nicher. //written on before edit1.
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