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POPluggable Error Handling Strategy
 

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    <p>I have service object (Service A), that has some specific repetitive asynchronous task . This service object also has a supervising object (Service B). I want to handle most of the errors concerning the specific task in Service A and only inform Service B if it needs to take any additional measures (e.g. when Service A does not know how to handle the error).</p> <p>Since Service A depends on external resources (e.g. network availabilty) there are many different exceptions, that can be thrown and I do not know all of them right now.</p> <p>Because of that I would also like to have a pluggable eror-handling strategy inside Service A so that it can handle different exceptions differently. I would like to plug in those stratgies using my IoC container.</p> <p>Example A: Service A is supposed to download something every 30 sec. (polling), but the URL is malformed so a MalformedURLException is thrown. A looks up the error handling strategy for MalformedURLExcpetion and in this case the strategy will mean canceling the download and informing Service B (the supervisor) via a callback.</p> <p>Example B: Service A is supposed to download something, but the hostname cannot be resolved. Again an Exception is thrown (sorry don't know exact type now) and the corresponding strategy will be looked up: in this case the download should be stalled and retried at another time until a certain threshold is hit.</p> <p>My problem now: How should I implement this dynamic lookup of error handling strategies and the strategies themselves? Is there a pattern for that?</p>
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