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Let's talk mediator

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Hello out there. I was hoping I could try the interest (and possibly patience) of a few engineers on this thread so that we could discuss the mediator pattern. I've done some homework on it, and for anyone who has read "Design Patterns: Elements of Reusable Object-Orientated Software" or any one of the plathora of books inspired by it, it would seem that this pattern has no real definitive interface. Of course I could be wrong, hence the post. I hypothesize that this may be true due to how customized the patterns' collaboration can end up. What really has my noodle baked is how this pattern relates to that of the observer. (As implied in the book) After reading the book and looking around I was suprised when I found that more often than not that an implementation of an observer really didn't use/integrate a mediator. (Although I did find this where a policy based mediator was created to manage list of subjects) For the observers I found that did incorporate some form of mediation, the general problem I found with most of their designs was that there was too little independence in their subscription & distrubution pipelines/polices to really justify what they were doing. What I'm hoping for is to hear YOUR take on this. In particular... 1) What do you think of my finds? Can you add/correct anything that I've stated? 2) Do you know of any excellent examples of the form in which I'm looking for? 3) Do you have anything you could add and/or elaborate upon which might help to paint a clearer picture? Thank you for your participation

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