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• Please recommend a patterns book for iOS development

  - by Brett Ryan

  I've read several books on iOS development and Objective-C, however what a lot of them teach is how to work with interfaces and all contain the model inside the view controller, i.e. a UITableViewController based view will simply have an NSArray as it's model. I'm interested in what the best practices are for designing the structure of an application. Specifically I'm interested in best practices for the following: How to separate a model from the view controller. I think I know how to do this by simply replacing the NSArray style example with a specific model object, however what I do not know how to do is alert the view when the model changes. For example in .NET I would solve this by conforming to INotifyPropertyChanged and databinding, and similarly with Java I would use PropertyChangeListener. How to create a service model for my domain objects. For example I want to learn the best way to create a service for a hypothetical Widget object to manage an internal DB and also services for communicating with remote endpoints. I need to learn the best ways to do this in a way that interface components can subscribe to events such as widgetUpdated. These services should be singleton classes and some how dependency injected into model/controller objects. Books I've read so far are: Programming in Objective-C (4th Edition) Beginning iOS 5 Development: Exploring the iOS SDK The iOS 5 Developer's Cookbook: Expanded Electronic Edition: Essentials and Advanced Recipes for iOS Programmers Learn Objective-C on the Mac: For OS X and iOS I've also purchased the following updated books but not yet read them. The Core iOS 6 Developer's Cookbook (4th edition Programming in Objective-C (5th Edition) I come from a Java and C# background with 15 years experience, I understand that many of the ways I would do things in these languages may not fit to the ObjC way of developing applications. Any guidance on the topic is very much appreciated.

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• Asynchronous update design/interaction patterns

  - by Andy Waite

  These days many apps support asynchronous updates. For example, if you're looking at a list of widgets and you delete one of them then rather than wait for the roundtrip to the server, the app can hide the one you deleted, giving immediate feedback. The actual deletion on the server will happen in the background. This can be seen in web apps, desktop apps, iOS apps, etc. But what about when the background operation fails. How should you feed back to the user? Should you restore the UI to the pre-deletion state? What about when multiple background operations fail together? Does this behaviour/pattern have a name? Perhaps something based on the Command pattern?

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• Design Patterns for Coordinating Change Event Listeners

  - by mkraken

  I've been working with the Observer pattern in JavaScript using various popular libraries for a number of years (YUI & jQuery). It's often that I need to observe a set of property value changes (e.g. respond only when 2 or more specific values change). Is there a elegant way to 'subscribe' the handler so that it is only called one time? Is there something I'm missing or doing wrong in my design?

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• Design patterns for effects between actors and technology

  - by changelog

  I'm working on my first game, and taking the opportunity to brush up my C++ (I want to make as much of it as portable as I can.) Whilst working on the technology tree and how it affects actors (spaceships, planets, crew, buildings, etc) I can't find a pattern that decouples these entities enough to feel like a clean approach. Just as an idea, here's the type of effects these actors can have on one another (and techs too) An engineer inside a spaceship boosts its shield A hero in a spaceship in a fleet increases morale A technology improves spaceships' travel distance A building in a planet improves its production The best I can come up with is the Observer pattern, and basically manage it more or less manually (when a crew member enters a spaceship, fire the event; when a new building is built in a planet, fire the event, etc etc.) but it seems to be too tightly coupled to me. I would love to get some ideas about how to approach this better.

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• Progressbar patterns (Eclipse)

  - by JesperE

  I've struggled quite a bit with Eclipse and progress-monitors to try to have good progressbars which report useful progress information to the user. Inevitably the code gets cluttered with lots of things like if (monitor.isCancelled()) return; ... lengthyMethodCall(monitor.newChild(10)); and all over the place I need to pass a IProgressMonitor as an argument to my methods. This is bad, for several reasons: The code gets cluttered with lots of code which is not relevant to what the function actually does. I need to manually guesstimate which parts of the code takes time, and which parts do not. It interacts badly with automated tests; where much of the information which goes into a progressbar instead should be logged for later inspection. Is there a way out of this? Are there tools which can help me out with one or more of these problems? Should I be looking at Aspect-Oriented Programming tools, or are there other alternatives?

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• Should universities put more emphasis on teaching their students about design patterns?

  - by gablin

  While I've heard about design patterns being mentioned in a few courses at uni, I know of only a single course which actually teaches design patterns. In almost all other areas (algorithms, parallelism, architecture, dynamic languages, paradigms, etc), there are several, often a basic course and an advanced course. Should universities put more emphasis about teaching their students about design patterns and provide more courses in design patters? Are lack of knowledge about design patterns common in just-graduated junior developers?

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• GoF Design Patterns - which ones do you actually use?

  - by CraigS

  I'm trying to educate my colleagues in the area of design patterns. Some of the original Gang of Four patterns are a little esoteric, so I'm wondering if there is a sub-group of "essential" patterns that all programmers should know. As I look through the list, I think I've probably used - Abstract Factory Factory Method Singleton Bridge Facade Command Which ones do you actually use in practice, and what do you use them for? Link for those wanting a list of patterns

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• Design Pattern Advice for Bluetooth App for Android

  - by Aimee Jones

  I’m looking for some advice on which patterns would apply to some of my work. I’m planning on doing a project as part of my college work and I need a bit of help. My main project is to make a basic Android bluetooth tracking system where the fixed locations of bluetooth dongles are mapped onto a map of a building. So my android app will regularly scan for nearby dongles and triangulate its location based on signal strength. The dongles location would be saved to a database along with their mac addresses to differentiate between them. The android phones location will then be sent to a server. This information will be used to show the phone’s location on a map of the building, or map of a route taken, on a website. My side project is to choose a suitable design pattern that could be implemented in this main project. I’m still a bit new to design patterns and am finding it hard to get my head around ones that may be suitable. I’ve heard maybe some that are aimed at web applications for the server side of things may be appropriate. My research so far is leading me to the following: Navigation Strategy Pattern Observer Pattern Command Pattern News Design Pattern Any advice would be a great help! Thanks

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• How to queue up Windows 8 file coping to only have one copying at a time

  - by Valamas

  The new windows 8 file explorer copying is great. I can setup multiple copying tasks. They appear in a single window and I am able to pause them. Is there a way to have the copying only occur one at a time and when complete to progress the next one? Currently I have to setup the file copy and pause subsequent ones, then unpause the next one when I notice the current one finishes. I am only asking about a way to queue the file explorer coping and not use alternative tools like robocopy.

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• Access file by its id and change file attributes

  - by 0xDEAD BEEF

  Just like every file also directories have file id. You can see them by typing ls -i How do I view file content by its id? How do I change directory attribute to file (remove D) and vice versa!

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• OpenFilesView Displays All Open and Locked Files to Help Resolve In-Use Errors

  - by Jason Fitzpatrick

  Windows: You go to move a file and Windows throws up an “In Use” error. OpenFilesView shows you what application or system process is locking up the files you’re trying to move. Sometimes the culprit is obvious; if you go to move your media folder and you’ve got your media player open watching South Park then shutting down the media player is the obvious solution. Other times the culprit is less obvious; sometimes Windows processes and less-than-obvious applications are accessing your files in ways that aren’t apparent. The screenshot below showcases the “In Use” error: This is where OpenFilesView comes into play. Fire up the application to see a list of all active files on your system. The master list is a bit overwhelming (on our test system there were over 1200 open files) but you use the find command to drill down to specific file or folder names. Once you’ve found the locked file you can close the file handle, kill the process, or bring the process to the front (so you can examine the program, if possible, before terminating it). It’s much more efficient than rebooting in an attempt to shake the In-Use error. OpenFilesView is freeware and works on Windows XP through Windows 7. HTG Explains: Do You Really Need to Defrag Your PC? Use Amazon’s Barcode Scanner to Easily Buy Anything from Your Phone How To Migrate Windows 7 to a Solid State Drive

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• Uploading.to Uploads Files to Multiple File Hosts Simultaneously

  - by Jason Fitzpatrick

  If you’re looking to quickly share a file across a variety of file hosting services, Uploading.to makes it a cinch to share up to 10 files across 14 hosts. The upload process is simple. Visit Uploading.to, select your files, check the hosts you want to share the file across (by default all 14 are checked), add a description to the collection, and hit the Upload button. Uploading.to will upload your file to the various hosts; during the process you’ll see which hosts are confirmed and which have failed. We had 2 failures among the 14 hosts which still left the file mirrored across a sizable 12 host spread–not bad at all. When you’re ready to share the file hit the Copy Link button at the bottom of the screen and share it with your friends. They’ll be directed to Uploading.to and will be able to select from any of the hosts the file was successfully mirrored across. Uploading.to is a free service and requires no registration. Uploading.to [via Addictive Tips] HTG Explains: Do You Really Need to Defrag Your PC? Use Amazon’s Barcode Scanner to Easily Buy Anything from Your Phone How To Migrate Windows 7 to a Solid State Drive

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• Who benefits from the use of Design Patterns?

  Who benefits from the use of design patterns is like asking who benefits from clean air or a good education. All of the stakeholders of a project benefit from the use of design patterns. Project Sponsor Project sponsors benefit from the use of design patterns because they promote reduced development time which translates in to shorter project timelines and greater return on investment compared to other projects that do not make use of design patterns. Project Manager Project managers benefit from the use of design patterns because they reduce the amount of time needed to design a system, and typically the sub components of the system already have a proven track record. System Architect/Engineer System architects/engineers benefit from the use of design patterns because reduce the amount of time needed to design the core a system. The additional time is used to alter the design pattern through the use of innovative design and common design principles to adhere to the project’s requirements. Programmer Programmers benefit from the use of design patterns because they can reuse existing code already established by the design pattern and only have to integrate the changes outlined by the system architects/engineers. Tester Testers benefit from the use of design patterns because they can alter the existing test established for the design pattern to take in to account the changes made by the system architects/engineers. User Users benefit from the use of design patterns because the software is typically delivered sooner than projects that do not incorporate the use of design patterns, and they are assumed that the system will work as designed because it was based on a system that was already proven to work properly.

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• Low coupling processing big quantities of data

  - by vitalik

  Usually I achieve low coupling by creating classes that exchange lists, sets, and maps between them. Now I am developing a batch application and I can't put all the data inside a data structure because there isn't enough memory. I have to read and process one chunk of data and then going to the next one. So having low coupling is much more difficult because I have to check somewhere if there is still data to read, etc. What I am using now is: Source - Process - Persist The classes that process have to ask to the Source classes if there are more rows to read. What are the best practices and or useful patterns in such situations? I hope I am explaining myself, if not tell me.

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• How to evade writing a lot of repetitive code when mapping?

  - by JPCF

  I have a data access layer (DAL) using Entity Framework, and I want to use Automapper to communicate with upper layers. I will have to map data transfer objects (DTOs) to entities as the first operation on every method, process my inputs, then proceed to map from entities to DTOs. What would you do to skip writing this code? As an example, see this: //This is a common method in my DAL public CarDTO getCarByOwnerAndCreditStatus(OwnerDTO ownerDto, CreditDto creditDto) { //I want to automatize this code on all methods similar to this Mapper.CreateMap<OwnerDTO,Owner>(); Mapper.CreateMap<CreditDTO,Credit>(); Owner owner = Mapper.map(ownerDto); Owner credit = Mapper.map(creditDto) //... Some code processing the mapped DTOs //I want to automatize this code on all methods similar to this Mapper.CreateMap<Car,CarDTO>(); Car car = Mapper.map(ownedCar); return car; }

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• Typing filename in standard open file dialog (Windows 7) - file name suggestion

  - by bybor

  When you use standard windows open file dialog and start typing it puts files whose name starts with what you type to drop down list. But on another pc with same Windows 7 it also puts first of them into input box in which you type - like FF does with URLS, allowing you to immediately press Enter (without pressing 'Down' to select file). I don't know why this behavior is different, but I want suggested file name shown in input box. How could it be achieved? Thanks.

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• Use a Free Tool to Edit, Delete, or Restore the Default Hosts File in Windows

  - by Lori Kaufman

  The hosts file in Windows contains mappings of IP addresses to host names, like an address book for your computer. Your PC uses IP addresses to find websites, so it needs to translate the host names into IP addresses to access websites. When you enter a host name in a browser to visit a website, that host name is looked up in DNS servers to find the IP address. If you enter IP addresses and host names for websites you visit often, these websites will load faster, because the hosts file is loaded into memory when Windows start and overrides DNS server queries, creating a shortcut to the sites. Because the hosts file is checked first, you can also use it to block websites from tracking your activities on the internet, as well as block ads, banners, third-party cookies, and other intrusive elements on webpages. Your computer has its own host address, known as its “localhost” address. The IP address for localhost is 127.0.0.1. To block sites and website elements, you can enter the host name for the unwanted site in the hosts file and associate it with the localhost address. Blocking ads and other undesirable webpage elements, can also speed up the loading of websites. You don’t have to wait for all those items to load. The default hosts file that comes with Windows does not contain any host name/IP address mappings. You can add mappings manually, such as the IP address 74.125.224.72 for www.google.com. As an example of blocking an ad server website, you can enter the following line in your hosts file to block doubleclick.net from serving you ads. How To Use USB Drives With the Nexus 7 and Other Android Devices Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It

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• How often are design patterns used in the workplace using PHP

  - by Metropolis

  Hey everyone, I read a book awhile back called PHP Design Patterns and Practice, and ever since then I have been using design patterns whenever I think they are needed. However it just occurred to me that maybe most companies do not use design patterns very often for PHP, or at all. What I was wondering is, do most companies use design patterns to help improve code flexibility? And if so, what are the best design patterns to learn for PHP? Thanks for any help on this, Metropolis

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• Has the emerging generation of programmers got the wrong idea about design patterns? [closed]

  - by MattDavey

  Over the years I've noticed a shift in attitude towards design patterns, particularly amongst the emerging generation of developers. There seems to be a notion these days that design patterns are silver bullets that instantly cure any problem, a proliferating idea that advancing as a software engineer simply means learning and applying more and more patterns. When confronted with a problem, developers no longer strive to truly understand the issue and design a solution - instead they simply pick a design pattern which seems to be a close fit, and try to brute-force it. You can see evidence of this by the many, many questions on Stack Overflow that begin with the phrase "what pattern should I use to...". I fall into a slightly more mature category of developers (5-10 years experience) and I have a very different viewpoint on patterns - simply as a communication tool to enhance clarity. I find this perspective of design patterns being lego bricks (collected like pokemon cards) a little disconcerting. Will developers lose this attitude as they gain more experience in software engineering? Or could these notions perhaps steer the direction of our craft in years to come? Did the older generation of developers have any similar concerns about us? (perhaps about OO design or similar...). if so, how did we turn out?

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• Specifying a file name for the FTP and File based transports in OSB

  - by [email protected]

  A common question I receive is how to incorporate a variable value into a file name when using the FTP, SFTP, or File transports in Oracle Service Bus.  For example, if one of the fields in a message being put down to a file by the File transport is an order number variable, then how can you make the order number become part of the file name?  Another example might be if you want to specify the date in the file name.  The transport configuration wizard in OSB does not have an option to allow for this, other than allowing you to specify a static prefix of suffix variable.

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• Magento Design Patterns

  - by JonB

  Magento, IMHO, represents a PHP system that is built on well thought-out coding principles - reuseable design patterns being one of them. In terms of an example of a PHP system, I think it can be considered pretty cutting edge and therefore worth considering from an architectural point of view. As I understand it, there are many design patterns that are available to the OOP developer. Seeing such patterns being put to use in an open-source system such as Magento allows a developer to view examples of such patterns in real use and in situ, rather than in examples that can sometimes be rather achedemic, and even a little misleading. As such, I am wondering what patterns, other than the ones I have listed below, Magento programmers have used when developing for Magento. As a note, I understand that some of these patterns are in place as a consequence of being built on the Zend Framework, MVC / Front Controller being a couple of them, The obvious ones are: Factory: $product = Mage::getModel('catalog/product'); Singleton: $category = Mage::getSingleton('catalog/session'); Registry: $currentCategory = Mage::registry('current_category');

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• yum update failed

  - by Nemanja Djuric

  I have problem doint yum update on my OpenVZ VPS i get this error message : (56/69): glibc-devel-2.5-81.el5_8.7.x86_64.rpm | 2.4 MB 00:00 (57/69): libstdc++-devel-4.1.2-52.el5_8.1.x86_64.rpm | 2.8 MB 00:00 (58/69): binutils-2.17.50.0.6-20.el5_8.3.x86_64.rpm | 2.9 MB 00:00 (59/69): cpp-4.1.2-52.el5_8.1.x86_64.rpm | 2.9 MB 00:00 (60/69): device-mapper-multipath-0.4.7-48.el5_8.1.x86_64 | 3.0 MB 00:00 (61/69): mysql-5.1.58-jason.1.x86_64.rpm | 3.5 MB 00:03 (62/69): coreutils-5.97-34.el5_8.1.x86_64.rpm | 3.6 MB 00:00 (63/69): gcc-c++-4.1.2-52.el5_8.1.x86_64.rpm | 3.8 MB 00:00 (64/69): glibc-2.5-81.el5_8.7.x86_64.rpm | 4.8 MB 00:01 (65/69): gcc-4.1.2-52.el5_8.1.x86_64.rpm | 5.3 MB 00:01 (66/69): glibc-2.5-81.el5_8.7.i686.rpm | 5.4 MB 00:01 (67/69): python-libs-2.4.3-46.el5_8.2.x86_64.rpm | 5.9 MB 00:01 (68/69): mysql-server-5.1.58-jason.1.x86_64.rpm | 13 MB 00:07 (69/69): glibc-common-2.5-81.el5_8.7.x86_64.rpm | 16 MB 00:03 -------------------------------------------------------------------------------- Total 2.4 MB/s | 106 MB 00:44 Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Check Error: file /etc/my.cnf from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/bin/mysqlaccess from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/my_print_defaults.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/mysql.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/mysql_config.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/mysql_find_rows.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/mysql_waitpid.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/mysqlaccess.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/mysqladmin.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/mysqldump.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/man/man1/mysqlshow.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/charsets/Index.xml from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/charsets/cp1250.xml from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/charsets/cp1251.xml from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/czech/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/danish/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/dutch/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/english/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/estonian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/french/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/german/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/greek/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/hungarian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/italian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/japanese/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/korean/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/norwegian-ny/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/norwegian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/polish/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/portuguese/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/romanian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/russian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/serbian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/slovak/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/spanish/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/swedish/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /usr/share/mysql/ukrainian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.77-4.el5_6.6.i386 file /etc/my.cnf from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/bin/mysql_find_rows from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/bin/mysqlaccess from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/my_print_defaults.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_config.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_find_rows.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_waitpid.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlaccess.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqladmin.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqldump.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlshow.1.gz from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/Index.xml from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/cp1250.xml from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/cp1251.xml from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/czech/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/danish/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/dutch/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/english/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/estonian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/french/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/german/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/greek/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/hungarian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/italian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/japanese/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/korean/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/norwegian-ny/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/norwegian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/polish/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/portuguese/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/romanian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/russian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/serbian/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/slovak/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/spanish/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/swedish/errmsg.sys from install of mysql-5.1.58-jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/ukrainian/errmsg.sys from install of mysql-5.1.58- jason.1.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 Error Summary Thank you for help, Best regards, Nemanja

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• So Singletons are bad, then what?

  - by Bobby Tables

  There has been a lot of discussion lately about the problems with using (and overusing) Singletons. I've been one of those people earlier in my career too. I can see what the problem is now, and yet, there are still many cases where I can't see a nice alternative - and not many of the anti-Singleton discussions really provide one. Here is a real example from a major recent project I was involved in: The application was a thick client with many separate screens and components which uses huge amounts of data from a server state which isn't updated too often. This data was basically cached in a Singleton "manager" object - the dreaded "global state". The idea was to have this one place in the app which keeps the data stored and synced, and then any new screens that are opened can just query most of what they need from there, without making repetitive requests for various supporting data from the server. Constantly requesting to the server would take too much bandwidth - and I'm talking thousands of dollars extra Internet bills per week, so that was unacceptable. Is there any other approach that could be appropriate here than basically having this kind of global data manager cache object? This object doesn't officially have to be a "Singleton" of course, but it does conceptually make sense to be one. What is a nice clean alternative here?

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• Best Design Pattern for Coupling User Interface Components and Data Structures

  - by szahn

  I have a windows desktop application with a tree view. Due to lack of a sound data-binding solution for a tree view, I've implemented my own layer of abstraction on it to bind nodes to my own data structure. The requirements are as follows: Populate a tree view with nodes that resemble fields in a data structure. When a node is clicked, display the appropriate control to modify the value of that property in the instance of the data structure. The tree view is populated with instances of custom TreeNode classes that inherit from TreeNode. The responsibility of each custom TreeNode class is to (1) format the node text to represent the name and value of the associated field in my data structure, (2) return the control used to modify the property value, (3) get the value of the field in the control (3) set the field's value from the control. My custom TreeNode implementation has a property called "Control" which retrieves the proper custom control in the form of the base control. The control instance is stored in the custom node and instantiated upon first retrieval. So each, custom node has an associated custom control which extends a base abstract control class. Example TreeNode implementation: //The Tree Node Base Class public abstract class TreeViewNodeBase : TreeNode { public abstract CustomControlBase Control { get; } public TreeViewNodeBase(ExtractionField field) { UpdateControl(field); } public virtual void UpdateControl(ExtractionField field) { Control.UpdateControl(field); UpdateCaption(FormatValueForCaption()); } public virtual void SaveChanges(ExtractionField field) { Control.SaveChanges(field); UpdateCaption(FormatValueForCaption()); } public virtual string FormatValueForCaption() { return Control.FormatValueForCaption(); } public virtual void UpdateCaption(string newValue) { this.Text = Caption; this.LongText = newValue; } } //The tree node implementation class public class ExtractionTypeNode : TreeViewNodeBase { private CustomDropDownControl control; public override CustomControlBase Control { get { if (control == null) { control = new CustomDropDownControl(); control.label1.Text = Caption; control.comboBox1.Items.Clear(); control.comboBox1.Items.AddRange( Enum.GetNames( typeof(ExtractionField.ExtractionType))); } return control; } } public ExtractionTypeNode(ExtractionField field) : base(field) { } } //The custom control base class public abstract class CustomControlBase : UserControl { public abstract void UpdateControl(ExtractionField field); public abstract void SaveChanges(ExtractionField field); public abstract string FormatValueForCaption(); } //The custom control generic implementation (view) public partial class CustomDropDownControl : CustomControlBase { public CustomDropDownControl() { InitializeComponent(); } public override void UpdateControl(ExtractionField field) { //Nothing to do here } public override void SaveChanges(ExtractionField field) { //Nothing to do here } public override string FormatValueForCaption() { //Nothing to do here return string.Empty; } } //The custom control specific implementation public class FieldExtractionTypeControl : CustomDropDownControl { public override void UpdateControl(ExtractionField field) { comboBox1.SelectedIndex = comboBox1.FindStringExact(field.Extraction.ToString()); } public override void SaveChanges(ExtractionField field) { field.Extraction = (ExtractionField.ExtractionType) Enum.Parse(typeof(ExtractionField.ExtractionType), comboBox1.SelectedItem.ToString()); } public override string FormatValueForCaption() { return string.Empty; } The problem is that I have "generic" controls which inherit from CustomControlBase. These are just "views" with no logic. Then I have specific controls that inherit from the generic controls. I don't have any functions or business logic in the generic controls because the specific controls should govern how data is associated with the data structure. What is the best design pattern for this?

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• LSP vs OCP / Liskov Substitution VS Open Close

  - by Kolyunya

  I am trying to understand the SOLID principles of OOP and I've come to the conclusion that LSP and OCP have some similarities (if not to say more). the open/closed principle states "software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification". LSP in simple words states that any instance of Foo can be replaced with any instance of Bar which is derived from Foo and the program will work the same very way. I'm not a pro OOP programmer, but it seems to me that LSP is only possible if Bar, derived from Foo does not change anything in it but only extends it. That means that in particular program LSP is true only when OCP is true and OCP is true only if LSP is true. That means that they are equal. Correct me if I'm wrong. I really want to understand these ideas. Great thanks for an answer.

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