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  • Multithreaded java cache for objects that are heavy to create ?

    - by krosenvold
    I need a cache some objects with fairly heavy creation times, and I need exactly-once creation semantics. It should be possible to create objects for different CacheKeys concurrently. I think I need something that (under the hood) does something like this: ConcurrentHashMap<CacheKey, Future<HeavyObject>> Are there any existing open-source implementations of this that I can re-use ?

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  • Best Embedded SQL DB for write performance?

    - by max.minimus
    Has anybody done any benchmarking/evaluation of the popular open-source embedded SQL DBs for performance, particularly write performance? I've some 1:1 comparisons for sqlite, Firebird Embedded, Derby and HSQLDB (others I am missing?) but no across the board comparisons... Also, I'd be interested in the overall developer experience for any of these (for a Java app).

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  • Why would you use the ternary operator without assigning a value for the "true" condition?

    - by RickNotFred
    In the Android open-source qemu code I ran across this line of code: machine->max_cpus = machine->max_cpus ?: 1; /* Default to UP */ It this just a confusing way of saying: if (machine->max_cpus) { ; //do nothing } else { machine->max_cpus = 1; } If so, wouldn't it be clearer as: if (machine->max_cpus == 0) machine->max_cpus = 1; Interestingly, this compiles and works fine with gcc, but doesn't compile on http://www.comeaucomputing.com/tryitout/ .

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  • I can I separate multiple logical pages in a text file I create in Perl?

    - by Micah
    So far, I've been successful with generating output to individual files by opening a file for output as part of outer loop and closing it after all output is written. I had used a counting variable ($x) and appended .txt onto it to create a filename, and had written it to the same directory as my perl script. I want to step the code up a bit, prompt for a file name from the user, open that file once and only once, and write my output one "printed letter" per page. Is this possible in plain text? From what I understand, chr(12) is an ascii line feed character and will get me close to what I want, but is there a better way? Thanks in advance, guys. :) sub PersonalizeLetters{ print "\n\n Beginning finalization of letters..."; print "\n\n I need a filename to save these letters to."; print "\n Filename > "; $OutFileName = <stdin>; chomp ($OutFileName); open(OutFile, ">$OutFileName"); for ($x=0; $x<$NumRecords; $x++){ $xIndex = (6 * $x); $clTitle = @ClientAoA[$xIndex]; $clName = @ClientAoA[$xIndex+1]; #I use this 6x multiplier because my records have 6 elements. #For this routine I'm only interested in name and title. #Reset OutLetter array #Midletter has other merged fields that aren't specific to who's receiving the letter. @OutLetter = @MiddleLetter; for ($y=0; $y<=$ifLength; $y++){ #Step through line by line and insert the name. $WorkLine = @OutLetter[$y]; $WorkLine =~ s/\[ClientTitle\]/$clTitle/; $WorkLine =~ s/\[ClientName\]/$clName/; @OutLetter[$y] = $WorkLine; } print OutFile "@OutLetter"; #Will chr(12) work here, or is there something better? print OutFile chr(12); $StatusX = $x+1; print "Writing output $StatusX of $NumRecords... \n\n"; } close(OutFile); }

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  • SMS connecting to phone from VBA

    - by I__
    here's my code: Public Sub SendSMS() Dim n As Integer n = FreeFile ' Change the string below if using a different COM port or the port speed Open "COM3:9600,N,8,1" For Output As #n Print #n, "AT" Close #n End Sub i'm trying to connect to my phone that is attached to this computer. how do i catch responses to my AT COMMANDS? in hyperterminal you see responses right away, i want to be able to see them here as well, how do i do it?

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  • What is tagged structure initialization syntax?

    - by httpinterpret
    struct file_operations scull_fops = { .owner = THIS_MODULE, .llseek = scull_llseek, .read = scull_read, .write = scull_write, .ioctl = scull_ioctl, .open = scull_open, .release = scull_release, }; This declaration uses the standard C tagged structure initialization syntax. Can someone elaborate?

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  • Javascript popup different size in different browsers?

    - by Zolomon
    How come this pop-up gets a size other than what I have specified, when testing it in IE6 and FireFox 3.6? Firefox displays it correctly but IE6 is smaller for some reason. (620x530 instead) How can I fix it? <A id="myID" onclick="window.open('/sitecollectiondocuments/myPage.htm',&#13;&#10;'welcome','width=630,height=590')" href="javascript:void(0)"></A>

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  • store parameters in iPhone

    - by haicnpmk44
    Hi guys I try to store parameters in iphone application for example I want to store username and password after login. And next time when I re-open iphone application, I can re-get that username and password to login automatically. Thank you!

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  • How do I override file.write() under Python 3?

    - by Sorin Sbarnea
    Below works on Python 2.6 but on Python 3.x it doesn't: old_file_write = file.write class file(): def write(self, d): if isinstance(d, types.bytes): self.buffer.write(d) else: old_file_write(d) # ... do something like f = open("x") f.write("...") The problems is that with Python 3.x the first like will generate an error: NameError: name 'file' is not defined How can I make this work on Python 3.x? PS. In fact I'm looking for a solution that will work on both versions.

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  • Tunnel Failed at the time of Upload file to FTP

    - by Karthick
    File upload is works fine from my simulator (blackberry 8830).It upload the file to FTP Server. But in the device when I try to upload file to FTP server it gives the alert “Tunnel Failed “. I am using StreamConnection sc = (StreamConnection) Connector.open(url); How to solve this issue. Can anyone help me???

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  • How to close the connection after set Transation to Nothing or Commit/Rollback

    - by user1957271
    I develop the DAL class for db operation Public Sub StartTransaction() Dim objConnection As SqlConnection = EstablishConnection() objConnection.Open() Me.Transaction = objConnection.BeginTransaction() End Sub Public Sub CommitTransaction() Me.Transaction.Commit() End Sub Public Sub RollBackTransaction() Me.Transaction.Rollback() End Sub after start the transaction when we commit or rollback and set transaction object to nothing it dont close the connection attach with this transaction how I close the Connection attach to this transaction???

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  • A StringToken Parser which gives Google Search style "Did you mean:" Suggestions

    - by _ande_turner_
    Seeking a method to: Take whitespace separated tokens in a String; return a suggested Word ie: Google Search can take "fonetic wrd nterpreterr", and atop of the result page it shows "Did you mean: phonetic word interpreter" A solution in any of the C* languages or Java would be preferred. Are there any existing Open Libraries which perform such functionality? Or is there a way to Utilise a Google API to request a suggested word?

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  • Localize Strings in Javascript

    - by SaaS Developer
    I'm currently using .resx files to manage my server side resources for .Net. The application that I am dealing with also allows developers to plugin javascript into various event handlers for client side validation, etc.. What is the best way for me to localize my javascript messages and strings? Ideally, I would like to store the strings in the .resx files to keep them with the rest of the localized resources. I'm open to suggestions.

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