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Connect and share knowledge within a single location that is structured and easy to search. My plan is that upon publishing, the listener receives both a Vintage Books Publisher Location Java Vintage Books Publisher Location Java reference to the model and to the publisher. This allows the publisher class to have multiple owners, and provide Vintage Books Publisher Location Java a way for listeners to know exactly how they were called.
I've got a few small points about Vintage Books Publisher Location Java this code and then I have some other points regarding your design. I'll try to discuss your design in perspective to game-development where I am completely inexperienced and in perspective to the more common Java area business applications. Your class and interface names seem to come from a C dominated development perspective to me. Prefixing I to interfaces smells. NET to me. Whenever I am developing Java I try to keep interfaces without clutter and Vintage Books Publisher Location Java then usually suffix the implementation classes if that is required.
Next thing that somewhat bit me was the A prefix for your abstract class. I am not a great friend of abstract classes anyways. I try to avoid Vintage Books Publisher Location Java them wherever I can and prefer interfaces and "Default[ I have been going better with that since abstract classes Vintage Books Publisher Location Java Vintage Books Publisher Location Java Vintage Books Publisher Location Java often end up constraining publishwr use of the "Interface" too.
I'd rather write a little duplicate code than Vintage Books Publisher Location Java creating a central abstract class that limits my possibilities when using the interface. Instead I'll vintage books publisher Vintage Books Publisher Location Java location java a simple, if not "minimalistic" interface. Multiple minimalistic interfaces can be combined to allow vintage books publisher Vintage Books Publisher Location Java location java complex uses, but since vintaye use-case is clear Anyways vimtage is enough of abstract talk about personal Vintage Books Publisher Location Java Vintage Books Publisher Location Java preferences in regards to language constructs.
Let's give your code a thorough examination. What instantly struck me when Vintage Books Publisher Location Java I first saw your code was the lack of explicit visibility modifiers on your AEventPublisher and your IEventListener. Neither of these needs the other for context so much that you'd have to put them into the same Vintage Books Publisher Location Java classfile. This seems to be a lot of unnecessary work to me. Also you're locatiin restricting the possibilities you Vintage Books Publisher Location Java Publisher Location Vintage Java Books have, when using your publishing mechanism.
IMO the following would be sufficient:. You have two choices when creating an Vintage Books Publisher Location Java Vintage Books Publisher Location Java abstract class like. Either you allow "full" access to your fields by making them javx or you close yourself Vintage Books Publisher Location Java off completely. You did that not even bad, but I viintage two small vitnage to make. Make use of "Vintage Books Publisher Location Java common" language vintage books publisher location java You're currently initializing your List in the constructor, and again repeat the clunky generics definition.
Save yourself from that and use the Java 7 feature: the diamond operator. It makes overly clunky generics as java has them easier by shortcircuiting redundancy:. Next publishe is how you handle publishing. The problem you're describing when you implemented your javs method is rooted in how you restricted yourself when starting Vintage Books Publisher Location Java Vintage Books Publisher Location Java directly with an abstract class, instead of taking yourself the vintage books publisher location java of creating an interface for a Publisher.
Consider the following:. This greatly simplifies your generics vintage books publisher location java and nestings and additionally resolves vintage books publisher location java conflict you had internally. If you'd sacrifice a little "flexibility" which Vintage Books Publisher Location Java you problably won't need anyways, more lateryou could even make your IEventListener much simpler and completely locatkon rid Vintage Books Publisher Location Java of the second type-parameter you introduced.
In general your design is somewhat over the top. You try to keep Vintage Books Publisher Location Java Vintage Books Publisher Location Questions Vintage Books Publisher Location Java flexibility and allow substitions which is in principle a good thing in places where it's overly complicating your source-code and detrimental to code-readability and hurtful to your actual vintage books publisher location java. You will never Vintage Books Publisher Location Java Vintage Books Publisher Location Java need a Listener, which can listen to multiple different model classes, and if against all odds you need it, Vintage Books Publisher Location Java an abstract class or interface to group these model-classes is the simplest call to make.
You went too far in your idealistic approach to be "open to everything". This is something you should strive to do, but not Vintage Books Publisher Location Java at the cost of simplicity and effectiveness. In addition to that, gamedevelopment is a often heavily performance-reliant environment, and Vintage Books Publisher Location Java let me tell you, overcomplicated generics and backreferencing interfaces are not something to make the JVM run faster.
I also have no idea why you'd need or publieher the Listener upblisher obtain a reference to the publisher. From what I see with my nonexistant experience you could "directly" subscribe to your model, which would then pass a Vintage Books Publisher Location Java reference to itself to it's listener. But that makes the whole Model-circus in your code moot, and defeats the point of a separate Publisher which I don't see in the first place.
In general, separating the Publisher from the "published" is somewhat overkill and most probably sign of an underlying design mistake. I can not imagine a situation where I'd have to get a reference to a Publisher, before publishing. You're again: Vintage Books Publisher Location Java overly complicating a simple matter. You want to bring data from one end to another, depending on certain conditions. And Vintage Books Publisher Location JavaLocation Publisher Java Vintage Books ng> there's already a lot of existing solutions beginning with Observable and ending god knows locatiln in the Vintage Books Publisher Location Java Vintage Books Publisher Location Java Java world for.
Which is also what makes this model somewhat problematic from a business perspective. The simplicity of Vintage Books Publisher Location Java existing solutions beats your idea easily. The loxation use-case is from locwtion point of view missing. Overall you reinvented the wheel, but not as wheel, but as a polygon. Your solution to "Get data from A to B Vintage Books Publisher Location Java on vintage books publisher location java suffers from clunkyness in publjsher. It's a bumpy ride and I don'Vintage Books Publisher Location Java Vintage Books Publisher Location Java t know vintage books publisher location java I'd make it better without landing at some place that's Vintage Books Publisher Location Java Vintage Books Publisher Location Java Vintage Books Publisher Location Java already polished for use.
A few changes and a little headscratching later I was at the state of code Vintage Books Publisher Location Java Vintage Books Publisher Location Java that follows. This code should in essence be able to do the same things that your code can do, Vintage Books Publisher Location Java but is IMO much simpler. Let me know what pubblisher think. Vogel covered most of the style points, as Vintage Books Publisher Location Java well as the very appropriate challenge "is this worth doing".
An important idea to understand in writing this code well is that you have two very different concerns embedded in AEventPublisher. Vintage books publisher location java first of these is a Publisher; there is also a manager of EventListeners. Vintage books publisher location java will be much clearer if we expose these abstractions.
Notice that these generics are unconstrained - the concepts we are representing here Vintage Books Publisher Location Java Vintage Books Publisher Location Java are generic, so the types should express. The complexity that is specific to this use case will be publixher in the classes that implement the use bopks. As a side note, I'm not too keen on actionPerformed. I'd strongly prefer either onEvent -- for jsva generic handler -- or onEventHappened.
The fact that we're anticipating Vintage Books Publisher Location Java Vintage Books Publisher Location Java generics does jsva good naming harder; but I think onActionPerformed would be more consistent with best practices. Disclaimer: crazy formatting for readability is a publksher smell -- a good code review should challenge you hard on whether this Vintage Books Publisher Location Java introduces unnecessary complexity.
So what the heck is this? Breaking it down, we're defining a class with two Books Vintage Java Location Publisher generic parameters. E is an event, jva can be anything; P is The class also promises to implement the Vintage Books Publisher Location Java nice clean Vintage books publisher location java and Observable interfaces we defined earlier. Through the generics, we're able Java Vintage Publisher Books Location to resolve the circular dependency; it's all syntactic sugar, so although we get turtled all the way down, the types are all going to be erased when the compiler goes to work. The publish method was made Vintage Books Publisher Location Java Vintage Books Publisher Location Java Vintage Books Publisher Location Java protected and abstract, because I couldnt think of a way to get this in AEventPublisher to be casted as Vintage Books Publisher Location Java Vintage Books Publisher Location Java the Publisher extends AEventPublisher.
Right -- we simply cannot use this in the base class and preserve the specialized Vintage Books Publisher Location Java behavior that we want. We beat with vintage books publisher location java seemingly self referential P parameter in the Vintage Books Publisher Location Java signature -- our specialized EventPublisher is going to provide an implementation of self with the exact signature we need it to have for the EventListeners to do the right thing.
Let's try an example - I wanted my IDE to show me that things actually worked, so first I created some implementations to be used in the template specialization. That's enough to prove that the EventHandler is really handling the right type of bintage. But Vintage Books Publisher Location Java I also want to vintage books publisher location java that it can really distinguish the right kind of Vintage Books Publisher Location Java EventPublisherso I add an extra interface that the JoystickEventPublisher itself is expected to implement.
A couple of further points. The "abstract self " pattern shows up in other contexts -- locatin very useful for implementing fluent builders. So you might consider teasing that locatiion. Which is nice, clean, re-usable It works great when you are building a new class from scratch. However, if you are trying to vintage books publisher location java some other class, the language won't allow you to extend a second class, and bookks have to re-write the self declaration.
Vintave may not Vintage Books Publisher Location Java Vintage Books Publisher Location Java be worth the effort. Second - you may not want to restrict jjava kinds of Listeners are attached to Vintage Books Publisher Location Java EventPublishers. For instance, you might have a generic listener that wants to subscribe to joystick events and keyboard events.
We can support that here by vintage books publisher location java the constraints on the listeners. That's going Vintage Books Publisher Location Java Vintage Books Publisher Location Java to change the Observer part of the interface while leaving everything else alone -- another hint that observe locatiion Vintage Books Publisher Location Java Vintage Books Publisher Location Java publish are boooks separate concerns. Finally, you may find that you want to extend JoystickEventPublisher. In the implementation above, the class was deliberately declared final to close that door, vintag the definition of self provided by JoystickEventPublisher is going to prevent the event listeners from loctaion any new methods in ExtendedJoystickEventPublisher.
The right answer is to refactor Vintage Books Publisher Location Java the JoystickEventPublisher into two pieces - an abstract and extendable piece that has all of the interesting parts publishe the interface, and a final concrete piece that implements self. This implementation allows us to create a kind of JoystickEventPublisher which shares the implementation of the BobNotifier interface in addition to providing new methods Sign up to vintage books publisher location java this vintage books publisher location java. The best answers are voted up and rise Vintage Books Publisher Location Java to the top.
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