Books about MVVM, architecture, design patterns for Windows Phone 8.1

Hi,
I'm looking for a book or books (or other resources) that explain how to develop an app with a proper architecture. I mean what each layer (bussines layer, data layer, network access) should do and how should it look like. I'm also looking for a book about
MVVM.
Right now I'm struggling with how to create a layer for network communication - how to separate classes for requests and responses, how to manage requests and create some queue of requests and also to provide some way to cancel them when they are no longer
needed, how to work with servers that use some level of security (cookies, certificates etc.).
Another thing is caching - how to design a short-term cache or a persistant cache (database), what technologies I can use etc.
Last thing that I'm struggling with is also naming. How to name classes in those layers, e.g. to distinguish between classes mapping data from some ORM database, for mapping on JSON in network communication. etc.
I hope you got the idea :)
Thanks.

Currently, I don't find a book about MVVM pattern for Windows Phone 8.1, but I think MSDN and some blogs have some useful samples and conceptions: http://msdn.microsoft.com/en-us/library/windows/apps/jj883732.aspx
http://channel9.msdn.com/Series/Windows-Phone-8-1-Development-for-Absolute-Beginners
And I think your question includes too much scopes, maybe you need to split it into some blocks and get help in the related forum
Best Regards,
Please remember to mark the replies as answers if they help

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↓ Did my reply answer your question? Accept it as a solution to help others, Thanks. ↓

Is it ok to reply to this topic? There isn't a warning against it...
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Choice of design pattern for data acquisition system

Hello all
I have a trouble about selecting the suitable design pattern / architecture for a data acquisition system.
Here is the details of the desired system:
There is data acquisition hardware and I need to use it by observing parameters on User interface.
the data acquisiton period, channel list to scan should be chosen on User interface. Besides, there are many user interface interactions. e.g. if user selects a channel to add scanlist, then I need to enable and make visible some other parts on user interface.
When user completes the channel selection, then he will press the button to start data acquisition. Then I also need to show the scanned values on a graph in real time and log them in txt file.
I know that I cannot use producer consumer pattern here. because the data acquisition loop should wait for parameters to scan channels. and it works in a given period by user. so the user interface loop performs higher rate then consumer loop (data acquisition loop). it means queue will be bigger bigger. if I use notifier it will loss some data come from user interface.
is there any idea about that ? is there any suitable design pattern for this case ?
Thanks in advance
best regards
Veli BAYAR
Embedded Systems Software and Hardware Engineer
"You live in a graphical world. Why not program in one?"
Solved!
Go to Solution.

johnsold wrote:
Veli,
I recommend the Producer/Consumer model with some modifications.
You might need three loops. I cannot tell for sure from your brief description.
The User Interface loop responds to the user inputs for configuration and start/stop of acquisition. The parameters and commands are passed to the Data Acquisition loop via a queue. In this loop is a state machine which has Idle, Configuration, Acquisition, and Shutdown states (and perhaps others). The data is sent to the Processing loop via a different queue. The Processing loop performs any data processing, displays the data to the user, and saves it to file. A notifier can be used to send the Stop or shutdown command from the User Interface loop to the other loops. If the amount of processing is minimal and the file write times are not too long, the Processing loop functions might be able to occur in the Timeout case of the UI loop Event structure. This simplifies things somewhat but is not as flexible when changes need to be made.
I am not sure that a Design Pattern for this exact setup exists but it is basically a combination of the Producer/Consumer (Events) and Producer/Consumer (Data) Design Patterns.
Lynn
Check out this thread: http://forums.ni.com/t5/LabVIEW/Multiple-poll-case-structures-to-event-help/td-p/2551309
There are discussions there about a 3-loop architecture that may help you.
Jeff
Jeffrey Zola

Is there a design pattern for this?

I'm looking for a solution to a design problem I have.
For a restaurant booking system I need a number of different opening times describing when you can and cannot book. These opening times are essentially Jodatime Period objects. There's a set of opening times spanning a week and these are repeated for every week (a default set of opening times) however it's possible to override these opening times say for a specific day.
The domain model would be something like a Restaurant class holding 2 Lists of OpeningTime objects one for defaultOpeningTimes and the other for overiddenOpeningTimes the overidden ones get used if they exist for the requested time period. However the database model would be a bit messy as I'd have 2 lists mapping to the same table (OpeningTime). Is that a good idea? Perhaps there's a design pattern for this, if someone could point me in the right direction I'd be very grateful, or perhaps this is the best solution? Thanks!

jduprez wrote:
But why do you put the logic in the database too (I'm no DB expert and I didn't know these concepts until I read your post, but that's what a dynamic view based on derived values looks like to me): performance (1 round-trip instead of two)?Hi jduprez. Long time no speakee.
I guess part of it is that I spent many years as a DBA and modeller, and really appreciate what it's taught me about design. Also, databases are (or should be) designed from the ground up to provide data-directed requests optimally, and include all sorts of nice stuff like transaction handling that aid consistency, as well as speed.
That said: I HATE SQL. Think Coliseum, with that emblazoned in 60-foot high letters around its walls, and it might come close to just how much I hate that so-called "language". I hate its form; I hate it's inconsistencies; I hate the fact that something like what OP is trying to do is NOT an easy task (and might involve the creation of a table that simply contains Dates, just in order to satisfy Boolean logic).
However, once you work it out, a database view (at least from the database's standpoint; JDBC I'm not so sure about) is just like any other Table - and that I DO like.
Programs are good at processing parameterized (ugh) temporal information; databases are good at persistence and high volume. Those two may meet at some point, but I reckon it's going to take another Codd (or Joda) before it does.
- that's clearer to 90% of the dev team (my biased numbers, based on 50% of Java developers having decent knowledge of SQL and much less than that having the advanced SQL knowledge which I rank your suggestion at)Sounds to me like you'll get the solution that matches the skills you have then. Is that what you really want, if a better one is available?
- that doesn't require investigating the if of your suggestion (JDBC support)Agreed, but only because my JDBC knowledge isn't what it could be. I'd also be surprised if it doesn't support access to a named view, since they were designed to be equivalent to Tables.
- the Op is using DAOs, so it's possible, if profiling does show this is hampering performances, to change that with no impact on the client code that calls the DAO.There's no doubt that a database solution is much higher level than a programming one; but, as I said, it's what they were designed to do. And tinkering around with program optimization has the feel of a "hacker's solution" to me. Not that there's any particular problem with that - I do it quite often when I have no control over my source - but I also try to keep in mind what the "actual" problem is.
Winston

Design pattern for quiz module

Hello fellow developers.
I am making/refactoring a module in a jee mobileplatform. It's a quiz module where the enduser participates via sms. Now, I am trying to redesign the module and I am thinking about using the state pattern for this, where the user can be in i.e the following states: StartQuizState(welcomemessage and first question), NextQuestionState, NoAnswerState(the user sent an empty or no valid response), QuizFinishedState(sum up the points etc), and maybe a BonusState if the user makes x points within a specific time limit.
I was wondering if anyone had any comments on my choice of pattern for this module :)
Thanks in advance for any comments,
Best regards,
Eivind

Good morning Saish, sorry for my late response.
First of all - thanks again for showing such interest in my "discussion", and my deepest apologies for my grammatical error hehe, I was tired and wrote a little bit too fast. Normally I take great pride in writing correctly :)
I would also like to say that many, many times before, these forums, and others, have helped me when stuck in a programming problem or other problems related to software. So without all those people out there willing to spend their free time answering questions from people like me, a lot of us wouldn't be able to solve whatever problem we might have, and basically the general experience amongst inexperienced programmers would evolve much slower. So Saish, thanks to people like you there are a lot of happy programmers out there. It is very important for those of us working with development, to share whatever knowledge we might have.
Anyway back to the discussion:)
I totally agree, the state is absolutely the Quiz, not the contestant of the quiz. I just read a Head first design patterns (a great book by the way!), and I was a bit to hung up on using patterns instead of looking for a solution that works. So what I have done so far, refactoring my solution:
I have the following models:
- Quiz
- Contestant
- Answer
- QuizManager
Quiz Object
The Quiz model that represents the actual quiz, which contains a list of Question objects, and Answer objects. The quiz has a int constant QUIZ_STATE, and the possible states:
private static final int START_QUIZ_STATE = 0;
private static final int FINISH_QUIZ_STATE = 1;
private static final int NEXT_QUESTION_STATE = 2;
private static final int REPEAT_QUESTION_STATE = 3;
private int quizState = START_QUIZ_STATE;
As you can see the quizState defaults to START_QUIZ_STATE. The first thing I do when the contestant enters, is to check the state of the quiz, if he already is an contestant, if the quiz is finished etc.
Then I continue and process the quiz based on the state of the quiz (this time everything in one class - a quizmanager).
Contestant Object
Contestant model containing what questions are already answered, number of points and so on.
Answer Object
The Answer object is created if the contestant sends an answer and his answer corresponds with the alternatives in the Answer object. E.g if the answer alternatives are a) 100 kilometers and b) 20 kilometers, and the contestant sends an answer c, it is considered as no answer, and the last question is repeated, if the contestant sends a, or b, his answered is compared with the current Answer alternative, and a new question is sent him.
I have some database tables for managing this module, and basically a Quiz is configured as an XML, where 1 xml is a quiz, and 1 quiz xml can contain many question and answer tags. These are read upon quiz start, and Quiz, Answer, and Question objects are created. Every time a new contestant enters, a new Contestant object is ofcoursed created.
All the logic takes place in the previously mentioned QuizManager. Any comments on the solution so far would be greatly appreciated.
If interesting to anyone I can post the classes when I am finished with the module, as a standalone java application without a database.
Regards,
Eivind

Flex design pattern for BlazeDS transfer objects

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This is a very nice seperatin of concerns architecture BUT there are two major performance issues:
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Thanks in advance

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What is the best design pattern for this problem?

No code to go with the question. I am trying to settle on the best design pattern for the problem before I code. I want to use an Object Oriented approach.
I have included a basic UML diagram of what I was thinking so far.
Stated simply, I have three devices; Module, Wired Modem, and Wireless Modem.
In the Device Under Test parent class, I have put the attributes that are variable from device to device, but common to all of them.
In the child classes, I have put the attributes that are not variable to each copy of that device. The attributes are common across device types. I was planning to use controls in the class definition that have the data set to a default value, since it doesn't change for each serial number of that device. For example, a Module will always have a Device Type ID of 1. These values are used to query the database.
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The '1' is the device type ID, the 39288 is the serial number, and the return would be "A000" or "S002", for example.
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The overall idea is that the same data is used to send multiple queries to the database and receiving back various data that I then evaluate for pass of fail, and for date order.
What I can't settle on is the approach. Should it be a Strategy pattern, A Chain of Command pattern, a Decorator pattern or something else.
Ideas?

elrathia wrote:
Hi Ben,
I haven't much idea of how override works and when you would use it and why. I'm the newest of the new here.
Good. At least you will not be smaking with a OPPer dOOPer hammer if I make some gramatical mistake.
You may want to look at this thread in the BreakPoint where i trie to help Cory get a handle on Dynamic Dispatching with an example of two classes that inherit from a common parent and invoke Over-ride VIs to do the same thing but with wildly varying results.
The example uses a Class of "Numeric" and a sibling class "Text" and the both implement an Add method.
It is dirt simple and Cory did a decent job of explaining it.
It just be the motivation you are looking for.
have fun!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Hello, I own a license for Adobe CS5 Production Premium and Adobe CS4 Design Premium for Windows/PC. I am switching to an OSX/MAC system. Is it possible to transfer my licenses to the new platform?

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I purchased a copy of adobe creative suite 3 design standard for windows at a garage sale. I tried registering the product, but it has already been registered. Is there anything I can do?
Thanks

Only if you get the license holder of the software to transfer the license to you
Transfer an Adobe product license

Books about MVVM, architecture, design patterns for Windows Phone 8.1

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