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• Best practice -- Content Tracking Remote Data (cURL, file_get_contents, cron, et. al)?

  - by user322787

  I am attempting to build a script that will log data that changes every 1 second. The initial thought was "Just run a php file that does a cURL every second from cron" -- but I have a very strong feeling that this isn't the right way to go about it. Here are my specifications: There are currently 10 sites I need to gather data from and log to a database -- this number will invariably increase over time, so the solution needs to be scalable. Each site has data that it spits out to a URL every second, but only keeps 10 lines on the page, and they can sometimes spit out up to 10 lines each time, so I need to pick up that data every second to ensure I get all the data. As I will also be writing this data to my own DB, there's going to be I/O every second of every day for a considerably long time. Barring magic, what is the most efficient way to achieve this? it might help to know that the data that I am getting every second is very small, under 500bytes.

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• SOLR and Natural Language Parsing - Can I use it?

  - by andy

  hey guys, my requirements are pretty similar to this: Requirements http://stackoverflow.com/questions/90580/word-frequency-algorithm-for-natural-language-processing Using Solr While the answer for that question is excellent, I was wondering if I could make use of all the time I spent getting to know SOLR for my NLP. I thought of SOLR because: It's got a bunch of tokenizers and performs a lot of NLP. It's pretty use to use out of the box. It's restful distributed app, so it's easy to hook up I've spent some time with it, so using could save me time. Can I use Solr? Although the above reasons are good, I don't know SOLR THAT well, so I need to know if it would be appropriate for my requirements. Ideal Usage Ideally, I'd like to configure SOLR, and then be able to send SOLR some text, and retrieve the indexed tonkenized content. Context So you guys know, I'm working on a small component of a bigger recommendation engine.

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• A good architecture is evil? Hardcode forever?

  - by igor

  I have worked in many companies. Most of all reached a big success in their field. Some times I found the code was written by owner or co-owner or the first developer of this company. It was strange from architectural point of view code or awful code styled, or hardcoded and so on. I know a couple of startups, that were grown up and were started from the "one night" code. Is it only way to get success to write code in this way? Why does a code written "on knee" but in time is better than delayed well thought-out one? What about future? Which way is the best: to write a good architecture, code and spend some more time at the startup or to write "fast" and hardcoded one that would be completely (partially) throw out (or maybe wouldn't) after some period of time (or never)?

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• ant - trying to copy to /lib/endorsed, library is not available in windows 7 to the next task

  - by kfox

  On Windows 7 I have an ant target that copies a xalan library into the jdk endorsed directory so that the next xslt transformation task can occur. The first time that the ant target runs, the xslt transformation fails. The second time it runs the jar file is already in the correct place and the xslt tranformation succeeds. The first time that the ant target runs, it looks like the file copied successfully. It feels like a timing issue, but I don't know what I can do to get around it. Here is my copy task: <mkdir dir="${java.home}\lib\endorsed"/> <copy file="${basedir}\xalan.jar" tofile="${java.home}\lib\endorsed\xalan.jar"/> Has anyone seen anything like this before?

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• Android: heavy traffic on server causes app to force close

  - by user522559

  I have developed an app to communicate with my own server and published it. However, sometimes the app force closes. I know there is no bug in the code because the app works properly most of the time, but sometimes it is waiting for an answer from the server forever. I think this is due to the fact that so many people are using the app, and the app refreshes every 1 second or so, so this heavy traffic causes the server to take a large amount of time to respond. So how do you take care of such a use case? should I have a use case where if the server does not respond after some time you just stop the app and throw a message saying that the server is not responding or something like that?

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• "Error opening associated documents" message when loading VS

  - by kumar

  When loading up a solution in VS2008 I get this message: An error was encountered while opening associated documents the last time this solution was loaded. Document load is being skipped during this solution load in order to avoid that error. It shut down immediately the first time I opened it. The next time I opened it, VS popped up a message box but did not shut down at first; however, it did shut down when I clicked a usercontrol or ASPX page. How can I find which document is causing the problem? Thanks...

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• c program for this quesion

  - by sashi

  suppose that a disk drive has 5000 cylinders, numbered 0 to 4999. the drive is currently serving a request at cylinder 143 and the previous request was at cylinder 125. the ueue of pending requests in the given order is 86,1470,913,17774,948,1509,1022,1750,130. write a 'c' program for finding the total distance in cylinders that the disk arm moves to satisfy all the pending reuests from the current heads position, using SSTF scheduling algorith. seek time is the time for the disk arm to move the head to the cylider containing the desired sector. sstf algorithm selects the minimum seek time from the current head position.

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• Maven and db4o dependency

  - by Jens Jansson

  I'm intrigued to test new frameworks in the Java world, and decided to create a new project that takes advantage of Maven and db4o. I'm starting to get a hang of Maven, but I have a hard time adding db4o as a dependency to the project. First problem is that db4o doesn't exist in the official Maven repositories. Next up comes the problem that db4o seem to have recently restructured their whole site's URI:s, so I'm getting 'site not found' messages all the time when I try to navigate their site. I found somewhere a potential Maven repository that should be at https://source.db4o.com/maven but I get all the time "Error reading archetype catalog https://source.db4o.com/maven Unable to locate resource in repository" when I try to access it. So, any suggestions on how I'll get db4o up through Maven? I've managing Maven through Eclipse with the M2Eclipse plugin.

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• What lessons can you learn from software maintanence?

  - by Vasil Remeniuk

  Hello everyone, In the perfect world, all the software developers would work with the cutting edge technologies, creating systems from the scratch. In the real life, almost all of us have to maintain software from time to time (unlucky ones do it on a regular basis). Personally I first 2 years of my career was fixing bugs in the company that no longer exists (it has been taken up by Oracle). And probably the biggest lesson I've learned that time - despite of the pressure, always try to get as much information about the domain as possible (even if it's irrelevant to fixing a specific bug or adding a feature) - abstract domain knowledge doesn't lose value as fast as knowledge about trendy frameworks or methodologies. What lessons have you learned from maintenance?

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• How do I create a view with a picker on the bottom and a table view on the top?

  - by Andy

  Hi - first time asker, long-time lurker. I am trying to create an iPhone view that has a date/time picker on the bottom half of the screen, and a grouped, single-section, four-row table view on the top half of the screen (almost identical to the one Apple shows in Fig. 2-4 of their View Controller Programming Guide (but then never goes on to explain). Conceptually, I think I understand that what I need is a main view with a pair of subviews - one for the picker, and one for the table view. I'm pretty sure I can make the picker function once I have it on-screen, and I'm pretty sure I can make the table view function too. What I can't for the life of me figure out is how, programmatically speaking, to get the two views onto the screen simultaneously. I can lay it out perfectly in Interface Builder, but then it all goes to hell when I switch to Xcode...the view appears with the picker, but no table view. Thanks, in advance, for any help you can offer.

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• c++ networking issue- retrnsmittion without ccongestion

  - by gln

  I wrote an application in c++ which send data over tcp connection to several machines.as part of the protocol I use in my application, the other side sends hearbeat messages from time to time, then I know that the connection is still alive. now, I want this application to work on 100 machines or more at the same time. but, I see that sometimes I don't get these heartbeat messages although they sent: I see in wireshark that the packet arrived, then my OS doesn't ack on this message, so there are some retransmit without any ack from my OS. if I look in the window size property - I saw that there is no issue in this part. what can be the root cause for this behavior? it is something in my code that I should change? this is my select code: int res = select(fdCount, &readFds, NULL, NULL, NULL ); I'm using server 2008 r2. Please help me! thanks

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• MySQL Locking table from Stored FUNCTION

  - by Brandon

  I have a function in a MySQL Database that determines some sync parameters for a mobile device. The function determines the last date/time the user synchronized with the database. During my sync operation I call this server side function twice. As soon as I call it the second time - the entire Sync_Records table is locked. I cannot write to it from any other connection anywhere (note, after first call, the table is not locked). I changed the function to a Procedure - and all is fine - no locking after the second call. The entire sync operation (including both calls to the function/procedure) is within a transaction. This is an InnoDb table. The function/procedure simply does two select statements. They are storing results in local variables and then returning the date time variable. I don't understand why the tables are locked. Does anyone have any ideas?

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• What should happen when a reference is deleted?

  - by Apeksha

  I have a vb.net 3.5 application which references a dll (abc.dll, also in .net 3.5) This dll is accessed by the application from time to time. If at anytime during execution, if I delete the dll, I expect the application to throw an error the next time it tries to use a class from the dll. But, this is not the behaviour I see. If I delete the dll before startup, the application throws an error at startup. But not when the dll is deleted after startup. Is this the standard behaviour, or am I doing something wrong? Can I get the app to throw an error if the dll is not found when it tries to use its classes? Thanks in advance.

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• Can Atom be used for things besides syndication feeds?

  - by greim

  Purely in terms of its conceptual model, is the purpose of Atom (and RSS) only to provide a time-sequential series of frequently-updated items, such as "most recent blog posts" or "last twenty SVN commits," or can Atom be legitimately used to represent static and/or non-time-sequential listings/indices? As an example, "index of files under this directory", "dog breeds" or "music genres". Even if there's a date associated with the items, like a file's last modified date, what if you don't necessarily want time to be the primary consideration when you represent that model to your users? The context for this is passing around (generating and consuming) lists of things in a REST-ful environment, hopefully using a well-understood format, where "date something was created/updated" is a pertinent detail, but not the primary consideration. I realize there's probably no right answer, but wanted to get some perspectives. Thanks.

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• Best way to store weekly event in MySQL?

  - by mazin k.

  I have a table of weekly events that run on certain days of the week (e.g. MTWTh, MWF, etc.) and run on a certain time (e.g. 8am-5pm). What's the best way to store day of week information in MySQL to make retrieving and working with the data easiest? My CakePHP app is going to need to retrieve all events happening NOW(). For time of day, I would just use TIME. For days of the week, I had considered a 7-bit bitfield, a varchar ("MTWThFr" type deal) for the days of the week, but both of those seem like clunky solutions (the varchar being clunkier). Any suggestions?

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• Load external swf from a button in external swf and unload self?

  - by ChristinaR

  Hello, I am an uber n00b to flash AS3. And it is not my intention to sound like a complete moron, but honestly, I have had a hard enough time figuring out just how to load an external .swf into my main file! And now my friend is asking me if I could please add a button within the external .swf which will unload itself and load a new on in its place... I have looked around in the forums for an answer for a while now and I believe it is time for me to break down, admit defeat, and ask for help. Can someone please tell me it's not that difficult..? Surely it is possible... Thank you in advance for any advice at all! I am looking forward to the time when I can post a response here!

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• Geocoding service for a startup?

  - by Sologoub

  I'm working on an idea for a service that uses geocoded data (lat/lng) form a US address. Google maps API v3 has been awesome, until I read the terms of service and acceptable uses a little closer. The problem is that the terms seem to prohibit use of the maps API for any commercial use where the site is not freely accessibly to the public, such as a subscription based service. The alternative offered is Google Maps API Premier, but at $10,000 per year minimum, it's just not possible at this time. Same goes for services offered by Yahoo! and MS - initial fees are small for enterprises, but for a very early stage startup (not even a finished prototype yet!) it's just not doable. Geocoding process needs to be real-time and volume would be very small - user would enter address at setup time and only update it if needed. Any help is greatly appreciated!

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• Please help clarify my regex pattern

  - by Dmitriy Sosunov

  I have the following string: <script>m('02:29:1467301/>Sender1*>some text message?<<02:29:13625N1/>Sender2*>Recipient2: another message??<>A<<02:29:1393100=>User1*|0User2*|%></B><<','');</script> N.B. messages are separated by << I need extract from message the following parts: 1. Time 2. Sender 3. Recipient 4. Text Recipient may being defined or not, this field is optional. I do this by the following pattern: (?<message>(?<time>\d{1,2}:\d{1,2}:[0-9a-z]+)/>(?<messageData>(?<sender>.+?)\*>(.+?)))<< But, I cannot extract recipient separately from the message text. (?<message>(?<time>\d{1,2}:\d{1,2}:[0-9a-z]+)/>(?<messageData>(?<sender>.+?)\*>(((?<recipient>.+?):){0,1}(?<messageText>.+?))))<< Please help correct my pattern.

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• Portable way to determine the platform's line separator

  - by Adrian McCarthy

  Different platforms use different line separator schemes (LF, CR-LF, CR, NEL, Unicode LINE SEPARATOR, etc.). C++ (and C) make a lot of this transparent to most programs, by converting '\n' to and from the target platform's native new line encoding. But if your program needs to determine the actual byte sequence used, how could you do it portably? The best method I've come up with is: Write a temporary file in text mode with just '\n' in it, letting the run-time do the translation. Read back the temporary file in binary mode to see the actual bytes. That feels kludgy. Is there a way to do it without temporary files? I tried stringstreams instead, but the run-time doesn't actually translate '\n' in that context (which makes sense). Does the run-time expose this information in some other way?

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• why arrayfun does NOT improve my struct array operation performance

  - by HaveF

  here is the input data: % @param Landmarks: % Landmarks should be 1*m struct. % m is the number of training set. % Landmark(i).data is a n*2 matrix old function: function Landmarks=CenterOfGravity(Landmarks) % align center of gravity for i=1 : length(Landmarks) Landmarks(i).data=Landmarks(i).data - ones(size(Landmarks(i).data,1),1)... *mean(Landmarks(i).data); end end new function which use arrayfun: function [Landmarks] = center_to_gravity(Landmarks) Landmarks = arrayfun(@(struct_data)... struct('data', struct_data.data - repmat(mean(struct_data.data), [size(struct_data.data, 1), 1]))... ,Landmarks); end %function center_to_gravity when using profiler, I find the usage of time is NOT what I expected: Function Total Time Self Time* CenterOfGravity 0.011s 0.004 s center_to_gravity 0.029s 0.001 s Can someone tell me why? BTW...I can't add "arrayfun" as a new tag for my reputation.

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• Is there any reason why someone would want to create an Core Data model programmatically?

  - by mystify

  I wonder in which cases it would be good to make an NSManagedObjectModel completely programmatically, with NSEntityDescription instances and all this stuff. I'm that kind of person who prefers to code programmatically, rejecting Interface Builder. But when it comes to Core Data, I have a hard time figuring out why I should kill my time NOT using the nice Xcode Data Modeler tool. And since data models are stuck to a given state (except when you want to do some ugly migration operations where thinks probably go wrong and users get mad, really mad), I see no big sense in a data model that's made programmatically for the purpose of changing it all the time. Did I miss something?

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• [SCORM 2004] the cmi.total_time parameter does not return anything.

  - by Nephila

  I am programming a SCORM 2004 product. I can update the session_time, it works. I can set the status (passed, failed, etc...) I also can get the cmi.location time. No problems! But I don't succeed atingt get the total time (cmi.total_time). I have tested on 2 LMS: On Ganesha the API.GetValue('cmi.total_time') is an empty string. On Moodle the API.GetValue('cmi.total_time') is just a "P". I do have the correct logs with correct session times. EDIT. I also try on cloud.scorm.com and cmi.total_time returns each time PT0H0M0S.

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• overview/history of resident memory usage

  - by kapet

  I have a fairly complicated program (Python with SWIG'ed C++ code, long running server) that shows a constantly growing resident memory usage. I've been digging with the usual tools for the leak (valgrind, Pythons gc module, etc.) but to no avail so far. I'm a bit afraid that the actual problem is memory fragmentation within Python and/or libc managed memory. Anyway, my question is more specific right now: Is there a tool to visualize resident memory usage and ideally show how it develops over time? I think the raw data is in /proc/$PID/smaps but I was hoping there's some tool that shows me a nice graph of the amounts used by mmap'ed files vs. anonymous mmap'ed memory vs. heap over time so that it's easier to see (literally) what's changing. I couldn't find anything though. Does anybody know of a ready to use tool that graphs memory usage over space and time in an intuitive way?

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• What are the most likely reasons an application would fail on only one of my servers?

  - by Rising Star

  I have several servers to test new code on. I primarily push out asp.NET web applications. Last week, I had an issue where I installed a newly developed web application on three servers. The three servers all run in separate environments. The application worked fine on two of them, but consistently crashed on the third server with each web request. The problem was eventually traced to an in-house developed .dll file being out of date on the third server. I'm certain that this kind of thing happens all the time. However, there are numerous things that could go wrong to cause this kind of behavior. I spent quite a bit of time tracing this problem. I would like to make a list of things to be suspicious of next time this happens? What are the most likely reasons that a web application would crash on one of my servers while identical code runs fine on another server.

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• Integrate ClickOnce update in a setup

  - by Erick

  As recent decision in my team we decided to deploy a software we develop for some time now in ClickOnce. Previously it was deployed with a merge module in a setup project. We had in mind to actually deploy the ClickOnce setup/updater in the web server setup. The problem here would not exactly to integrate it but to make sure to limit the human work to integrate it. Normally I guess it would be necessary to "add - file" and select the folder containing the setup.exe + publish.htm + application files + .application, but I fear that for each time we publish a new version to the hard drive we have to update the setup project as well. Would someone have some insight to help that ? (especially to not have to add the program_[version] folder inside application files that is created each time a new publish is done).

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