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• Examples of Liskov Substitution

  - by james lewis

  I'm facilitating a session next week on the Liskov Substitution Principle and I was wondering if anyone had any examples of violations 'from the trenches'? I'm looking for something other than uncle Bob's rectangle - square problem and the persistent set problem he talks about in A-PPP (although that is a great example). So far I'm using the example of a (very simple) List and an IndexedList as the 'correct' use of inheritance. And the addition of a Set to this hierarchy as a violation (as a Set is distinct; strengthening the pre condition of the Add method). I've also taken this great example and it's solution from this question Both those examples are great but I'm looking for something more subtle and harder to spot. So far I've come up with nothing so if you've got a great, subtle example post it up. Also, any metaphors you've come across that helped you understand LSP would be really useful too.

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• Getting My Head Around Immutability

  - by Michael Mangold

  I'm new to object-oriented programming, and one concept that has been taking me a while to grasp is immutability. I think the light bulb went off last night but I want to verify: When I come across statements that an immutable object cannot be changed, I'm puzzled because I can, for instance, do the following: NSString *myName = @"Bob"; myName = @"Mike"; There, I just changed myName, of immutable type NSString. My problem is that the word, "object" can refer to the physical object in memory, or the abstraction, "myName." The former definition applies to the concept of immutability. As for the variable, a more clear (to me) definition of immutability is that the value of an immutable object can only be changed by also changing its location in memory, i.e. its reference (also known as its pointer). Is this correct, or am I still lost in the woods?

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• Hello NHibernate! Quickstart with NHibernate (Part 1)

  - by BobPalmer

  When I first learned NHibernate, I could best describe the experience as less of a learning curve and more like a learning cliff.  A large part of that was the availability of tutorials.  In this first of a series of articles, I will be taking a crack at providing people new to NHibernate the information they need to quickly ramp up with NHibernate. For the first article, I've decided to address the gap of just giving folks enough code to get started.  No UI, no fluff - just enough to connect to a database and do some basic CRUD operations.  In future articles, I will discuss a repository pattern for NHibernate, parent-child relationships, and other more advanced topics. You can find the entire article via this Google Docs link: http://docs.google.com/Doc?docid=0AUP-rKyyUMKhZGczejdxeHZfOGMydHNqdGc0&hl=en Enjoy! -Bob

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• Mapping Object Relationships - QuickStart with NHibernate (Part 3)

  - by BobPalmer

  For this third tutorial, we'll be introducing users new to NHibernat to basic object relationships, starting with a simple many-to-one relationship.  I decided that it would make sense to at least get the readers through some basic relationship mapping (including varieties of parent/child and many to many relationships) before diverging into UI, since most folks are looking for enough to bootstrap themsevles into using NHibernate, and this almost always means some kind of relation between their objects. You can find a link to the article at: http://docs.google.com/Doc?docid=0AUP-rKyyUMKhZGczejdxeHZfMjJmM3c3M3Bnbg&hl=en As always, comments, corrections, and suggestions are appreciated! -Bob

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• Is There A Security Risk With Users That Are Also Groups?

  - by Rob P.

  I know a little about users and groups; in the past I might have had a group like 'DBAS' or 'ADMINS' and I'd add individual users to each group... But I was surprised to learn I could add users to other users - as if they were groups. For example if my /etc/group contained the following: user1:x:12501: user2:x:12502:user1 admin:x:123:user2,jim,bob Since user2 is a member of the admin group, and user1 is a member of user2 - is user1 effectively an admin? If the admin group is in the sudoers file, can user1 use it as well? I've tried to simulate this and I haven't been able to do so as user1...but I'm not sure it's impossible. EDIT: SORRY - updated error in question.

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• New Content: Partner News and Workforce Management Special Report

  - by user462779

  Two new bits of content available on Profit Online: Oracle partner Edgewater Ranzal worked with customer High Sierra Energy to integrate Oracle Hyperion Enterprise Performance Management solutions with Oracle E-Business Suite and simplify an increasingly complex financial reporting system. "They needed to eliminate the older processes where 80% of the time was spent on collecting data and only 20% on analyzing the data.” --Bob Sanders, business development manager, Edgewater Ranzal. In a special report about Workforce Management, Profit wraps up a collection of recent content on the subject and looks at Oracle's recent agreement to acquire SelectMinds. “By adding SelectMinds to Oracle’s Talent Management Cloud, Oracle can help customers with a complete talent management solution, enabling streamlined recruiting practices, more quality referrals, faster employee on-boarding, and better performance.” --Thomas Kurian, Executive Vice President, Oracle Development More updates to come as we continue to add content to Profit Online on a regular basis. Thanks for reading!

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• What is the term for a 'decoy' feature or intentional bug?

  - by Freiheit

  I have forgotten a slang programming term. This thing is an intentional bug or a decoy feature used as a distraction. An example usage, "Hey Bob, QA is doing a review today. Put a $THING into the module so they actually have a problem to find". This can be used negatively, to have a very obvious intentional flaw to discover as a distraction from a real problem. This can also be used positively. Its like how you always let rescue dogs 'find' a victim when searching a disaster area. It can also be used to verify that a QA process is actually catching flaws. What is the term I am looking for?

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• NDC Oslo Videos Are Online

  - by Brian Schroer

  Originally posted on: http://geekswithblogs.net/brians/archive/2014/06/07/ndc-oslo-videos-are-online.aspxJust when I was almost caught up on TechEd North America 2014 videos… The sessions from this week’s NDC Oslo conference can be viewed now on their Vimeo site: http://vimeo.com/ndcoslo/videos/sort:date/format:detail You can filter the conference’s agenda and find speakers / topics that you’re interested in via this page: http://ndcoslo.oktaset.com/agenda. If I counted correctly, there are 173(!) videos from this year’s conference, and a total of 467 videos from this and previous years. I’ve watched a lot of sessions from the major conferences that include .NET material, and NDC consistently has the best presentations in my opinion. There are lots of my favorite speakers: Crockford, Uncle Bob, Damian Edwards, Venkat Subramanian, Hanselman (I’m interested in seeing if he still thinks “poop” is funny, or got that out of his system at TechEd ;), Cory House (hey, KC!), the .NET Rocks Guys and more, so check it out!

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• What is the general definition of something that can be included or excluded?

  - by gutch

  When an application presents a user with a list of items, it's pretty common that it permits the user to filter the items. Often a 'filter' feature is implemented as a set of include or exclude rules. For example: include all emails from [email protected], and exclude those emails without attachments I've seen this include/exclude pattern often; for example Maven and Google Analytics filter things this way. But now that I'm implementing something like this myself, I don't know what to call something that could be either included or excluded. In specific terms: If I have a database table of filter rules, each of which either includes or excludes matching items, what is an appropriate name of the field that stores include or exclude? When displaying a list of filters to a user, what is a good way to label the include or exclude value? (as a bonus, can anyone recommend a good implementation of this kind of filtering for inspiration?)

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• failure to upgrade to 13.10 on ASUS 1015E-DS03

  - by user211270

  How should I proceed? On my last step to reach 13.10, after the download and installation and removal of unwanted packages, and after the reboot, I received this message: Sorry, a problem occurred while installing software. Package: i915-dkms The details revealed: Package i915-dkms 0.1 [origin: unknown] Problem Type Package Title i915-dkms 0.1: i915 kernel modele failed to build ApportVersion 2.12.5-0ubuntu2.1 Architecture amd64 DKMSBuildLog DKMSKernelVersion 3.11.0-12-generic Date Sun Nov 3 19:49:38 2013 Dependencies DistributionChannelDescriptor This is a distribution channel descriptor For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-annan-standard-precise-amd64-20130106-0 DistroRelease Ubuntu 13.10 InstallationDate Installed on 2013-01-24 (283 days ago) Thanks for any help, Bob Pendleton

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• Visual Basic 2010 is here!

  It was a very exciting time this week, with the launch of Visual Studio 2010 and .NET 4. On April 12th, 5 launch events took place around the world in Beijing, Kuala Lumpur, Bangalore, London and Las Vegas. The video from Bob Muglias VS 2010 Launch keynote is now available on-demand. The agenda for day was VS 2010 sessions, including Windows Development, SharePoint and Office, Dev & Test Collaboration, and Project Management. Follow the Visual Studio 2010 Launch tag on Channel9 for more There...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Working with Primary Keys and Generators - Quickstart with NHibernate (Part 4)

  - by BobPalmer

  In this NHibernate tutorial, I'll be digging into the ID tag and Generator classes.  I had originally planned on finishing up a series on relationships (parent/child, etc.) but felt this would be an interesting topic for folks, and I also wanted to start integrating some of the current NHibernate reference. Since this article also includes some reference sections (and since I have not had a chance to check for every possible parameter value), I used the current reference as a baseline, and would welcome any feedback or technical updates that I can incorporate. You can find the entire article up on Google Docs at this link: http://docs.google.com/Doc?id=dg3z7qxv_24f3ch2rf7 As always, feedback, suggestions, and technical corrections are greatly appreciated! Enjoy! - Bob

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• First Typemock Academy - 4 days from now

  This April 27th marks a special occasion for Typemock the first Typemock Partner Conference is about to take place in Oslo, Norway. Some special treats are expected (including a very cool after party), and Uncle Bob Martin and myself will be doing a special Q&A video conference live with the attendees as part of it. Attendance is by invite only, but you can see if youre eligible by going to this page and filling out your details. ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Oracle??57?JD Edwards??????

  - by user758881

  ??????????????,??????,Oracle???57?JD Edwards EnterpriseOne 9.1 ???????57?!????????,??????JD Edwards??????????Bob Monahan??????????? “?????,”Monahan???“??????,?????????????????JD Edwards EnterpriseOne???????????” Monahan?????,?????????????????????????????????????????????????????????????????????????,??Oracle?????????????????,?????????????????,???????????,????????  “????????????????,??????????,”Monahan???“????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????,?????,GPS,???,?????,????????????????????????????? ????????????????????????????;??????????????????;??????????????????????,????????,???????????” ??????,JD Edwards EnterpriseOne 9.1????????????????????????????????????????,??,IT????URL?????????JD Edwards??????????? ??????????? ?? JD Edwards EnterpriseOne Mobile Solutions ??????????? Jim Lein ?????????????Oracle??????????1999???JD Edwards,???????Oracle15?????????Evergreen,Colorado,????????????????????????????????????????,????Oracle???

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• OOW 12: Thank you Oracle WebCenter Partners!

  - by kellsey.ruppel

  Yesterday evening we were happy to participate in the Oracle WebCenter Customer Appreciation Event! Oracle WebCenter partners Fishbowl Solutions, Fujitsu, Keste, Mythics, Redstone Content Solutions, TEAM Informatics, and TekStream sponsored a reception at The Palace Hotel for Oracle WebCenter customers. This event provided an exclusive opportunity for customers to network with their peers and meet and talk with executives from Oracle WebCenter Product Management, Development, and Marketing along with Oracle’s premiere Oracle WebCenter partners.  Christian Finn, Sr. Director of Product Management for Oracle WebCenter and Bob Crossman, Vice President of Oracle WebCenter Sales welcomed attendees and thanked everyone for their continued support and partnership with Oracle WebCenter. We had a great turnout and enjoyed an evening of socializing and networking.    Thanks again Oracle WebCenter partners!

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• VirtualBox: Start Firefox in Ubuntu via a Windows script?

  - by SpaceRook

  I am using VirtualBox to run Ubuntu 12.04 as a guest in a Windows 7 host. I would like execute a command in Windows that will launch Ubuntu's Firefox. I tried VirtualBox's VBoxManage guestcontrol function. The command seems to do something, but nothing seems to happen in Ubuntu: C:\VirtualBox>VBoxManage.exe guestcontrol MyVirtualMachineUbuntu exec --image "/usr/bin/firefox" --username bob --password password --wait-stdout --verbose Waiting for guest to start process ... Waiting for process to exit ... Exit code=1 (Status=500 [successfully terminated]) The /usr/bin/firefox command works when I run it in Ubuntu. Also, with guestcontrol, I can successfully call /bin/ls. But I can't actually get a major program like Firefox to run. Any ideas? Thanks.

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• Halloween: Season for Java Embedded Internet of Spooky Things (IoST) (Part 2)

  - by hinkmond

  To start out our ghost hunting here at the Oracle Santa Clara campus office, we first need a ghost sensor. It's pretty easy to build one, since all we need to do is to create a circuit that can detect small fluctuations in the electromagnetic field, just like the fluctuations that ghosts cause when they pass by... Naturally, right? So, we build a static charge sensor and will use a Java Embedded app to monitor for changes in the sensor value, running analytics using Java technology on a Raspberry Pi. Bob's your uncle, and there you have it: a ghost sensor. See: Ghost Detector So, go out to Radio Shack and buy up these items: shopping list: 1 - NTE312 JFET N-channel transistor (this is in place of the MPF-102) 1 - Set of Jumper Wires 1 - LED 1 - 300 ohm resistor 1 - set of header pins Then, grab a flashlight, your Raspberry Pi, and come back here for more instructions... Don't be afraid... Yet. Hinkmond

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• How do you deal with poor management [closed]

  - by Sybiam

  I come from a company where during a project, we saw the client 3 time during the whole project. We were never informed when did the client came in office in order to discuss with him about his requirements. I did setup redmine and told them that if they have any request they can post an issue there. But they never really used redmine to publish anything. They would instead: harass a team member on the phone at any time of the day or night hand us over sheets of paper with new requests or changes hand us over new design (graphical) They requested how much time it would take us to finish the project, I gave them a date and a week to test everything and deployment. I calculated that time taking into account the current features we had to do. And then blamed us that our deadline was wrong and that we lied. But the truth is that one week before that deadline they added a couple of monster feature from nowhere and that week were we were supposed to test and deploy, my friends spent all day in the office changing all little things. After that project, my friend got some kind of depression and got scared everytime his phone rang. They kind of used him as a communication proxy. After that project of hell, (every body got pissed off on that project) as far as I know the designer who was working with us left work after that project and she had some kind of issue too with managers. My team also started looking for work somewhere else. At first I tried to get things straight with management, I tried to make a meeting to discuss about the communication issues and so on.. What really pissed me off and made me leave that job for good is the following. Me: "We have to discuss about what went wrong on the last project. It's quite important" Him: "Lets talk about it in a week or two. Just make a list of all the things you did wrong" Me: "We already have a new project and we want to prevent what happened on the last project to happen again" Him: "Just do it and well have our meeting in a week, make a list of all the thing you did wrong." It kind of ended there then he organized a meeting at a moment I wasn't unable to come. My friend discussed with him and tried to explained him that we really had to discuss about organization issue on how to manage a project. And his answer was pretty much: "During the meeting I don't want to ear how you want to us to manage a project but I want to know what you guys did wrong" After that I felt it wasn't even worth it discussing anything since they weren't even ready listening to us. Found a new job and I'm pretty happy with my choice. I'd like to know how you'd handle such situation. Is there anything to do to solve communication problem? After that project my friend got a depression and some other employee had their down too as far as I know. I wonder what else we can do other than leave these place as soon as possible. Feel sad for the people that are still there and get screamed at just because they need money in order to eat and finding an other job like that isn't that easy. note I died a little when our boss asked us to make a list of things we (programmers) did wrong. This is probably the stupidest request I ever got. If everybody thinks they did everything right, it doesn't mean that there is no problems. Individual problem are rarely the big issue. Colleagues help each others and solve theses issues to prevent problems.

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• C# 4.0 compiler version for CSharpCodeProvider

  - by scope-creep

  I'm using the usual CSharpCodeProvider codeProvider = new CSharpCodeProvider(new Dictionary<String, String> { { "CompilerVersion", "v3.5" } }); for the 3.5 compiler for dynamic code compilation. I'm assuming the 4.0 compiler just v4.0? Bob.

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• Why is the UpdatePanel Response size changing on alternate requests?

  - by Decker

  We are using UpdatePanel in a small portion of a large page and have noticed a performance problem where IE7 becomes CPU bound and the control within the UpdatePanel takes a long time (upwards of 30 seconds) to render. We also noticed that Firefox does not seem to suffer from these delays. We ran both Fiddler (for IE) and Firebug (for Firefox) and noticed that the real problem lied with the amount of data being returned in update panel responses. Within the UpdatePanel control there is a table that contains a number of ListBox controls. The real problem is that EVERY OTHER TIME the response (from making ListBox selections) alternates from 30K to 430K. Firefox handles the 400+K response in a reasonable amount of time. For whatever reason, IE7 goes CPU bound while it is presumably processing this data. So irrespective of whether or not we should be using an UpdatePanel or not, we'd like to figure out why every other async postback response is larger by a factor of more than 10 than the previous one. When the response is in the 30K range, IE updates the display within a second. On the alternate times, the response time is well over 10 times longer. Any idea why this alternating behavior should be happening with an UpdatePanel?

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• How can I reliably check client identity whilst making DCOM calls to a C# .Net 3.5 Server?

  - by pionium

  Hi, I have an old Win32 C++ DCOM Server that I am rewriting to use C# .Net 3.5. The client applications sit on remote XP machines and are also written in C++. These clients must remain unchanged, hence I must implement the interfaces on new .Net objects. This has been done, and is working successfully regarding the implementation of the interfaces, and all of the calls are correctly being made from the old clients to the new .Net objects. However, I'm having problems obtaining the identity of the calling user from the DCOM Client. In order to try to identify the user who instigated the DCOM call, I have the following code on the server... [DllImport("ole32.dll")] static extern int CoImpersonateClient(); [DllImport("ole32.dll")] static extern int CoRevertToSelf(); private string CallingUser { get { string sCallingUser = null; if (CoImpersonateClient() == 0) { WindowsPrincipal wp = System.Threading.Thread.CurrentPrincipal as WindowsPrincipal; if (wp != null) { WindowsIdentity wi = wp.Identity as WindowsIdentity; if (wi != null && !string.IsNullOrEmpty(wi.Name)) sCallingUser = wi.Name; } if (CoRevertToSelf() != 0) ReportWin32Error("CoRevertToSelf"); } else ReportWin32Error("CoImpersonateClient"); return sCallingUser; } } private static void ReportWin32Error(string sFailingCall) { Win32Exception ex = new Win32Exception(); Logger.Write("Call to " + sFailingCall + " FAILED: " + ex.Message); } When I get the CallingUser property, the value returned the first few times is correct and the correct user name is identified, however, after 3 or 4 different users have successfully made calls (and it varies, so I can't be more specific), further users seem to be identified as users who had made earlier calls. What I have noticed is that the first few users have their DCOM calls handled on their own thread (ie all calls from a particular client are handled by a single unique thread), and then subsequent users are being handled by the same threads as the earlier users, and after the call to CoImpersonateClient(), the CurrentPrincipal matches that of the initial user of that thread. To Illustrate: User Tom makes DCOM calls which are handled by thread 1 (CurrentPrincipal correctly identifies Tom) User Dick makes DCOM calls which are handled by thread 2 (CurrentPrincipal correctly identifies Dick) User Harry makes DCOM calls which are handled by thread 3 (CurrentPrincipal correctly identifies Harry) User Bob makes DCOM calls which are handled by thread 3 (CurrentPrincipal incorrectly identifies him as Harry) As you can see in this illustration, calls from clients Harry and Bob are being handled on thread 3, and the server is identifying the calling client as Harry. Is there something that I am doing wrong? Are there any caveats or restrictions on using Impersonations in this way? Is there a better or different way that I can RELIABLY achieve what I am trying to do? All help would be greatly appreciated. Regards Andrew

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• exchange powershell : get-mailbox outside default scope

  - by phill

  how do you run the cmdlet "get-mailbox" outside the current default scope of the current domain? When I run get-mailbox -OrganizationalUnit bob.com/bobsage I get an error message saying: Get-mailbox: The requested search root 'rmcv.com/rmcvanguard' is not in the current default scope 'ems-1.net'. Cannot perform searches outside the current default scope. thanks in advance

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• Forcing fputcsv to Use Enclosure For *all* Fields

  - by Alan Storm

  When I use fputcsv to write out a line to an open file handle, PHP will add an enclosing character to any column that it believes needs it, but will leave other columns without the enclosures. For example, you might end up with a line like this 11,"Bob ",Jenkins,"200 main st. USA ",etc Short of appending a bogus space to the end of every field, is there any way to force fputcsv to always enclose columns with the enclosure (defaults to a ") character?

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• Linq Distinct on list

  - by BahaiResearch.com

  I have a list like this: List people age name 1 bob 1 sam 7 fred 7 tom 8 sally I need to do a linq query on people and get an int of the number distinct ages (3) int distinctAges = people.SomeLinq(); how? how?

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• How do I return all conflict documents from a Notes Database?

  - by ssg31415926

  I want to get all conflict documents from a Notes database. So far, i've got this: Domino.NotesSession notesSession; Domino.NotesDatabase notesDatabase = this.OpenDatabase(out notesSession); Domino.NotesDateTime dateTime = notesSession.CreateDateTime(String.Empty); Domino.NotesDocumentCollection results = notesDatabase.Search(this.SearchString, dateTime, 0); It works with, for example: searchString = "@Contains(ShortName;\"Bob\")"; How can I do the equivalent for conflict documents?

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