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• How to secure Ubuntu for a non-technical user? (your mom)

  - by Gil

  My mother will be traveling for a while and I need to provide her with a secure laptop so she can work. A windows laptop is out of the question because: she'll be logging into dodgy hotel wireless networks and conference networks price of the windows license to install on a netbook I've installed libreoffice, media players and skype on it. Also enabled SSH so I can intervene but I am worried that I might not be in a position to do so. Possible threats: web browsing USB sticks insecure networks prone to intrusions malware SSH/VNC vulnerabilites Skype vulnerabilities All the "securing Ubuntu" guides out there assume the user has a certain level of technical knowledge but this is not the case with moms in general. If a malware can gain even user level access it might compromise her files.

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• Java best practice Interface - subclasses and constants

  - by Taiko

  In the case where a couple of classes implements an interface, and those classes have a couple of constants in common (but no functions), were should I put this constant ? I've had this problem a couple of times. I have this interface : DataFromSensors that I use to hide the implementations of several sub classes like DataFromHeartRateMonitor DataFromGps etc... For some reason, those classes uses the same constants. And there's nowere else in the code were it is used. My question is, were should I put those constants ? Not in the interface, because it has nothing to do with my API Not in a static Constants class, because I'm trying to avoid those Not in a common abstract class, that would stand between the interface and the subclasses, because I have no functions in common, only a couple of constants (TIMEOUT_DURATION, UUID, those kind of things) I've read best practice for constants and interface to define constants but they don't really answer my question. Thanks !

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• "Best fit" to avoid reuse of object instances in a collection

  - by Simon

  Imagine I have a collection of object instances which represent activities for a user to undertake. Dependent on user attributes, I have to randomly select instances to present activities to the user. For some users, I need to present more activities to them than there are available activities in which case, I want to use the following algorithm. If all available activities have already been presented to the user, then re-select a "used" activity, selecting the earliest presented activity ordered by frequency of use. In other words, try to reduce repetition and where repetition is unavoidable, use the instances which have been repeated less often and were presented furthest back in time. Before I go on to code that algorithm, I wondered if there is some existing pattern I can re-use? [EDIT] "Furthest back in time" is not relevant as I will pass the algorithm an ordered collection of used instances where the first entry is the first presented.

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• Search the internet for a term selected in a text editor/viewer

  - by cipricus

  It seems possible (as I learned from a comment to this question made by user55822) to use Artha in order to search a term on the Internet by using "keybinding". What the aforementioned user says is that "you could search mouse selection anywhere by using an app like Artha, or by keybinding sh -c 'firefox "http://translate.google.com/#en/fr/$(xclip -o)"' (example given translate english into french)" A lot of things are obscure for me here. I could use Artha or keybinding (as alternative), or both? How to do that in each case? and "The command I gave you will open google translate in Firefox with your mouse selection (text highlighted) as a query. Use sh -c 'firefox "https://www.google.com/search?q=$(xclip -o)"' if you want regular Google over Google translate. And obviously, that would work everywhere" I do not know what to do with that formula. What should I do exactly? How to use it? In what application?

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• How-To: AutoVue Bug Status Tracking & Email Notifications

  - by Graham McKendry

  I’ve posted a number of different Support process-related and tool-related blog entries over the past few years, and one common question I received back from various customers and partners is “How can I easily track AutoVue bugs & enhancements for status updates?” The capability to track bug status through the My Oracle Support (MOS) portal has existed in different forms for a while, although hasn’t necessarily been easy to find without going through specific segments of the extensive MOS training. Recently, the instructions were consolidated into the following highly recommended knowledge base article: KM Note 1298390.1 - How to Monitor a Bug from My Oracle Support The note covers various capabilities, including: How to add the new ‘Bug Tracker’ widget to your MOS dashboard How to add and manage bugs within the Bug Tracker and probably most interesting to MOS users... How to enable email notifications for bug status updates Make sure to pass this KM Note along to your MOS users in case they haven’t already configured this valuable feature.

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• Calling Web Service with Complex Parameters in ADF Mobile

  - by Shay Shmeltzer

  Many of the SOAP based web services out there have parameters of specific object types - so not just simple String/int inputs. The ADF Web service data control makes it quite simple to interact with them. And this applies also in the case of ADF Mobile. Since there were several thread on OTN asking about this - I thought I'll do a quick demo to refresh people memory about how you pass these "complex" parameters to your Web service methods. By the way - this video is also relevant if you are not doing mobile development, you'll basically use the exact same process for building "regular web" ADF applications that access these types of Web services. One more thing you might want to do after you create the page is look at the binding tab to see the method call in there, and notice the parameters for it in the structure property. Go and look at their NDValue property to get the complete picture.

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• What diagrams, other than the class diagram and the workflow diagram, are useful for explaining how an application works?

  - by Goran_Mandic

  I am working on a small Delphi project, composed of two units. One unit is for the GUI, and the other for data management, file parsing, list iterating and so on.. I've already made a class diagram, and my workflow looks like hell- it's too complex, even for anyone to read. I've considered making a dataflow diagram, but it would be even more complex. A use case diagram wouldn't be of use either. Am I missing some diagram type which could somehow represent the relationship between my two units?

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• Determine how to display a tile based on surrounding tiles

  - by Jsmith

  I have a game engine which generates maps randomly, set on a 2d grid which is composed of 34px square graphical tiles. These tiles can be displayed in any of three ways, wall, corner, and floor(exists in 2 states, passable and impassible), and four directions, north, south, west and east. What I need to do is, based on the tiles around each individual tile, determine which state to display the tile in, e.g. north wall, northeast corner, floor so that when a player alters the map, the tiles around the affected tile adjust themselves to suit(i.e. tunneling). In case it becomes important, all gameobjects are inherited from the same class, whether they be players, NPC's, walls, or items.

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• Viewport.Unproject - Checking if a model intersects a large sprite

  - by Fibericon

  Let's say I have a sprite, drawn like this: spriteBatch.Draw(levelCannons[i].texture, levelCannons[i].position, null, alpha, levelCannons[i].rotation, Vector2.Zero, scale, SpriteEffects.None, 0); Picture levelCannon as being a laser beam that goes across the entire screen. I need to see if my 3d model intersects with the screen space inhabited by the sprite. I managed to dig up Viewport.Unproject, but that seems to only be useful when dealing with a single point in 2d space, rather than an area. What can I do in my case?

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• How to support tableless columns with WYSIWYG editor?

  - by Andy

  On the front page of a site I'm working on there's a small slideshow. It's not for pictures in particular, any content can go in, and I'm currently setting up the editing interface for the client. I'd like to be able to have one/two/more columns in the editable area, and ideally that would be via CSS - does anyone know of a WYSIWYG editor that supports this? I'm using Drupal (would prefer not to involve Panels as it would require a bit of work to make it a streamlined workflow for content entry) in case that matters to anyone. To start the ball rolling, one way would be to use templates. I know CKEditor supports templates, and it looks like TinyMCE might have something similar. I don't know how well these work with tableless columns (the CKEditor homepage demo uses tables to achieve its two column effect). Holding out for a cool solution!

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• SEO: Joomla Category Page Optimization + Canonical Linking

  - by Huberis

  I'm wondering how best to optimize my Joomla site's SEO. I have pages with multiple articles on each page. Either via category-type pages, or via modules. In each case, I'm not wanting users to access the articles separately from the forward facing, menu-linked pages. I understand however that Joomla still generates a url for those articles, and Google can still crawl and display these articles separate from the pages. My question is what is the best way to control this so that my users get directed only to the front-facing pages? By using the canonical element for each article to point to the front-facing page it's on? Or is there a better method? Thanks for your help!

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• How to ignore collision between two objects

  - by eren_trigger

  I have a player that shoots in the direction that it is facing. However, the shot that is created when I click, also destroys the player. How would I make the shot ignore collision with the player? Or better yet, how to make a shot destroy anything it touches and destroy itself without affecting the player? This is the code that controls collisions: function OnTriggerEnter (col : Collider) { Destroy(col.gameObject); } The shot is a trigger, but the player isn't. Not sure if this changes anything in this case. Thanks in advance. EDIT: http://gfycat.com/TediousAridFeline

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• how to remap Ctrl to Escape if pressed and released on its own

  - by psvm

  I want to remap Control, so that: A. If it is pressed and released with no other key, it acts as Escape. B. If it is pressed & held together with another key, it acts as Control (no change in behavior in this case). I'm aware of How do I remap certain keys?, so I suspect it may be done with xmodmap. But that answer does not explain how to map the modifier keys. I looked into the examples and grammar sections of the xmodmap manpage, but they do not explain that. The answer in Remapping Caps Lock to Control and Escape (not the usual way) mention that it is not possible to do that to CapsLock, since it is a Lock key, but I hope this may be possible to do it with Control which is a mod key. A solution with something different than xmodmap will also be accepted. (I'm running Xmonad in Ubuntu 12.04, so perhaps there is a way to set this up in xmonad.hs?)

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• Where can I safetly search domain whois without worrying about the search engine parking on the domain immediately after the search?

  - by Evan Plaice

  There are a lot of companies that provide domain whois but I've heard of a lot of people who had bad experiences where the domain was bought soon after the whois search and the price was increased dramatically. Where can I gain access to a domain whois where I don't have to worry about that happening? Update: Apparently, the official name for this practice is called Domain Front Running and some sites go as far as to create explicit policies stating that they don't do it. This is where a domain registrar or an intermediary (like a domain lookup site) mines the searches for possibly attractive domains and then either sells the data to a third-party, or goes ahead and registers the name themselves ahead of you. In one case a registrar took advantage of what's known as the "grace period" and registered every single domain users looked up through them and held on to them for 5 days before releasing them back into the pool at no cost to themselves. Source: domainwarning.com And apparently, after ICANN was notified of the practice, they wrote it off as a coincidence of random 'domain tasting'. Source: See for yourself

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• Microsoft Sync. Framework with Azure on iOS

  - by Richard Jones

  A bit of a revelation this evening. I discovered something obvious, but missing from my understanding of the brilliant iOS example that ships with the Sync. Framework 4.0CTP It seems that on the server side if a record is edited, correctly only the fields that are modified gets sent down to your device (in my case an iPad). I was previously just blindly assuming that I'd get all fields down. I modified my Xcode population code (based on iOS sample) as follows: + (void)populateQCItems: (id)dict withMetadata:(id)metadata withContext:(NSManagedObjectContext*) context { QCItems *item = (QCItems *)[Utils populateOfflineEntity:dict withMetadata:metadata withContext:context]; if (item != nil) // modify new or existing live item { if ([dict valueForKey:@"Identifier"]) // new bit item.Identifier = [dict valueForKey:@"Identifier"]; if ([dict valueForKey:@"InspectionTypeID"]) // new bit item.InspectionTypeID = [dict valueForKey:@"InspectionTypeID"]; [item logEntity]; } } I hope this helps someone else; as I learnt this the hard way. Technorati Tags: Xcode, iOS, Azure, Sync Framework, Cloud

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• Coherence Query Performance in Large Clusters

  - by jpurdy

  Large clusters (measured in terms of the number of storage-enabled members participating in the largest cache services) may introduce challenges when issuing queries. There is no particular cluster size threshold for this, rather a gradually increasing tendency for issues to arise. The most obvious challenges are that a client's perceived query latency will be determined by the slowest responder (more likely to be a factor in larger clusters) as well as the fact that adding additional cache servers will not increase query throughput if the query processing is not compute-bound (which would generally be the case for most indexed queries). If the data set can take advantage of the partition affinity features of Coherence, then the application can use a PartitionedFilter to target a query to a single server (using partition affinity to ensure that all data is in a single partition). If this can not be done, then avoiding an excessive number of cache server JVMs will help, as will ensuring that each cache server has sufficient CPU resources available and is also properly configured to minimize GC pauses (the most common cause of a slow-responding cache server).

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• Why does Facebook convert PHP code to C++?

  - by user72245

  I read that Facebook started out in PHP, and then to gain speed, they now compile PHP as C++ code. If that's the case why don't they: Just program in c++? Surely there must be SOME errors/bugs when hitting a magic compiler button that ports PHP to c++ code , right? If this impressive converter works so nicely, why stick to PHP at all? Why not use something like Ruby or Python? Note -- I picked these two at random, but mostly because nearly everyone says coding in those languages is a "joy". So why not develop in a super great language and then hit the magic c++ compile button?

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• applyAngularVelocity causes error when called right after object instantiation

  - by Appeltaart

  I'm trying to make a physicsBody rotate as soon as it is instantiated. CCNode* ball = [CCBReader load:@"Ball"]; [ball.physicsBody applyForce:force]; [ball.physicsBody applyAngularImpulse:arc4random_uniform(360) - 180]; Applying force works fine, the last line however throws an error in cpBody.c line 123: cpAssertHard(body->w == body->w && cpfabs(body->w) != INFINITY, "Body's angular velocity is invalid."); When I don't apply force and merely rotate the problem persists. If I send applyAngularImpulse at some later point (in this case on a touch) it does work. Is this function not supposed to be called right after instantiation, or is this a bug?

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• How can I fix intermittent iSight camera functionality on a Macbook Pro 5,2?

  - by Mmmm

  I have a Macbook Pro 5,2 laptop dual booting OSX and Ubuntu. The built-in iSight video camera works only sporadically. By that I mean that sometimes if I boot and try to use the camera it does not work (most of the time) but other times it does. I don't have good repeatable data regarding when it does vs. when it doesn't other than to say that it always seems to work right after I upgrade to a new Linux kernel with the Update Manager and reboot, but then eventually stops working again until I upgrade the kernel again. That is hard to test repeatably, so it's hard to know for sure that that is the case. This has happened consistently with every version of Ubuntu from 10.10 through 11.10. I can get around this by booting into the OS/X partition, since all of the hardware obviously works perfectly on that side of things, but it would be great if I could remain in Ubuntu and do the same thing. Thanks in advance for any inSights.

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• In C++, is it a reflection of poor software design if objects are deleted manually?

  - by grokus

  With the advent of smart pointers, is it a sign of poor design if I see objects are deleted? I'm seeing some software components in our product that people are still doing this. This practice strikes me as un-idiomatic, but I need to be sure this is the industry consensus. I'm not starting a crusade but it'd be nice to be prepared theory wise. Edit: legit uses of delete, Klaim mentioned the object pool use case. I agree. Bad examples of using delete, I am seeing many new's in constructor or start() and corresponding delete's in the destructor or stop(), why not use scoped_ptr? It makes the code cleaner.

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• How important is to avoid name collisions between libraries belonging to different domains?

  - by Sergio

  I have written a small open source Java library for facilitating conversions between different types of objects (in the style of Google's gson, but quite more general). It seems to me that a nice natural name for my library is JConverter, after browsing in the web to see if another library with the same name already exists, I found a library with the same name for Joomla. My concrete question is: How important is to avoid naming collisions when creating an open source library if an existing library with the chosen name already exists in a complete different domain ? (in my concrete case, these are libraries even implemented for different languages).

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• Unit testing a text index

  - by jplot

  Consider a text index such as a suffix tree or a suffix array supporting Count queries (number of occurrences of a pattern) and Locate queries (the positions of all the occurrences of a pattern) over a given text. How would you go about unit testing such a class ? What I have in mind is to generate a big random string then extract a random substring from this big string and compare the results of both queries with naive implementations (such as string::find). Another idea I have is to find the most frequent substring of length l appearing in the original string (using perhaps a naive method) and use these substrings for testing the index. This isn't the best way, so what would be a good design of the unit tests for a text index ? In case it matters, this is in C++ using google test.

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• Do search engines rank internal redirects negatively?

  - by siverd

  A client is in the late stages (code complete) of a website redesign and unfortunately hasn't implemented 301 redirects to point high traffic pages to the new URL's. As I understand it our only option at this point is to create redirects within the CMS. Our CMS allows us to do this: www.mysite.com/category/current-page.html will redirect to www.mysite.com/new-category-name/new-page.html The site now uses custom logic on our 404 page to check this list of redirects and if one exists forwards the user to the new-page.html I understand that using 301 redirects would be the correct way to maintain our page rank but I think that would require a code change which isn't possible. Question How will search engines respond to this? Will they wait until the redirect happens and allow us to keep our page rank (authority, trust, etc) or will they see the 404 page and down-rank us? Worst case...will they make our new-page.html start from a rank of "0"? Thanks for your help.

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• How can I always show the close, minimise and maximise buttons on their windows and keep global menus?

  - by sup

  First, this is not a duplicate of How can I always show the close, minimise & maximise buttons into their own windows? - I would like to preserve global menus. Is there a way to only always show the close, minimise and maximise buttons on every application? The use case is as follows: I have a maximized application in the background, over it is a not-maximized application that has got focus. I want to close the maximized application. I move the pointer to upper left corner. The buttons do not show, since the background application does not have focus. I have to go back, click on it and then go back to the corner to close it. I do that several times a day :-( .

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• Is there a correlation between complexity and reachability?

  - by Saladin Akara

  I've been studying cyclomatic complexity (McCabe) and reachability of software at uni recently. Today my lecturer said that there's no correlation between the two metrics, but is this really the case? I'd think there would definitely be some correlation, as less complex programs (from the scant few we've looked at) seem to have 'better' results in terms of reachability. Does anyone know of any attempt to look at the two metrics together, and if not, what would be a good place to find data on both complexity and reachability for a large(ish) number of programs? (As clarification, this isn't a homework question. Also, if I've put this in the wrong place, let me know.)

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