Domain Model, Validation, and Pushing Errors to the Model

What I do is that I build my subjects (subordinates, objects within a domain) in such a way that they can never be instantiated by anyone other than the domain itself. (The main or central domain object.) This is in line with best practices: never use the new operator to instantiate objects that do not belong to you, (objects from other packages/namespaces/assemblies,) always invoke factories to do that. The domain is in a position of using new to instantiate its own subjects, because they belong to it. Instantiation of subjects only by the domain can be enforced by declaring their constructors as package-private, (assembly-internal,) or, better yet, by declaring the subject classes themselves as package-private, (assembly-internal,) and having them implement public interfaces, (interfaces exposed by the domain,) so that the outside world cannot even think of instantiating them.So, since subjects can only be instantiated by the domain, it is very easy to have the domain perform the necessary validation when creating them, as another answer suggested, so as to ensure that the subjects are valid right from the start. However, this does not completely solve the problem, because you may later want to rename a subject, (store a different name in it,) in which case you must again be prevented from giving it a name which is already taken by a different subject. Clearly, access to the database is needed at all times, in order to provide a complete service.So, the solution that I have found for this is that every subject knows its domain.The domain is always passed as the first parameter to the constructor of every subject. Every single instantiation of a subject by the domain looks like this: new Subject( this, ... ). In a sense, the role played by the domain in domain-driven programming parallels the role played by the object in object-oriented programming: Just as every method accepts as a hidden first parameter the this pointer, which points to the object, so does every subject accept as its first constructor parameter the domain pointer, which points to the domain.Thus, each and every subject is perfectly capable of performing whatever validation is necessary, by invoking the domain to do its validation. If you do not want your subjects to be tied to the domain, then your subjects may be thought of as having an extra state, indicating whether they are at any given moment parts of a domain or not. (persisted or not, equivalent to the "attached/detached" state of Hibernate.) So, an object may begin its life as not part of the domain, (not persisted, detached in Hibernate parlance,) in which case it cannot perform any validation, and later it may become part of the domain, (persisted, attached in Hibernate parlance,) at which point it receives a reference to the domain, and it may do whatever validation is necessary. Later you may even remove it from the domain, (detach it,) at which point you would presumably nullify the domain pointer and the object would again be unable to perform validation

1. Model Agency vs. Model Management Company?

An agency books their talent on jobs and take a commission. Many states have caps on how much % a talent agency can take as a commission. You are basically an employment agency A management company does not book models on jobs, but hooks them up with various agencies to try and get them jobs. They also help manage a model's career - whether the model should look into acting, etc. A model may be signed with 2-3 different agencies - one for editorial/fashion, one for commercial print (if her fashion agency does not book commercial work) and possibly one for acting or even singing. For example someone like Milla Jovovich has an agent for modeling, another agent for her acting, and another for her singing career - and one manager who helps hook her up with these various opportunities, but does not actually send her out on auditions. These days, most of the big agencies (Ford, Elite, IMG, etc) act both as agent and manager.

2. How to tell if the lens will fit?

You can fit analogue nikon lenses to a nikon digital camera. I've never done it myself but a friend has. Though neither I nor anyone else will be able to tell you if yours will fit a digital model because you have not provided us with enough info (perfectly understandable since you do not know anything about cameras). Your best bet would be to take it along to your local camera shop and they will tell you make/model etc and whether or not it will fit onto any digital body.

3. Can any1 that isn't an idiot help me ?

From your description of the problem, it sounds like the PCs power management is turning off the USB ports. Most PCs have some sort of power management control software. You did not say if it was a desktop or laptop or what brand and model.

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