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  • Summary of the last decade of garbage collection?

    - by Ben Karel
    I've been reading through the Jones & Lin book on garbage collection, which was published in 1996. Obviously, the computing world has changed dramatically since then: multicore, out-of-order chips with large caches, and even larger main memory in desktops. The world has also more-or-less settled on the x86 and ARM microarchitectures for most consumer-facing systems. How has the field of garbage collection changed since the seminal book was published?

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  • Best compiled language for Mac OS X and Linux compatibility

    - by corydoras
    We need to write some software that will compile and run on both an Mac OS X server and Ubuntu. We would love to use Objective-C with all of its Cocoa goodness, however the GNUstep implementations of the parts we are using are broken (in the latest Ubuntu package anyway.) In light of this should we use C++ (I would really rather not), C or something else that we have not thought of? It is a server/back-end process that is very resource intensive, Java and other interpreted versions of this software perform much worse than the Objective-C proof of concept we have written, hence we now wish to re-write in a "compiled[1]" language. (NB: Some people might consider this subjective, however at the end of the day we do need to get a job done, there has to be a reasonably appropriate correct answer here). [1] Compiled to native CPU instructions, not compiled into "byte codes" that then have to be run by an interpreter.

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  • invalid header file while using jar for archiving

    - by arshad
    When i use this cmd line : jar cmf arshad.mf ars.jar *.class i get this error : invalid header field name:Manifest-version This is my manifest file : Manifest-Version: 1.0 Main-Class:t i made the manifest file with notepad in UTF-8 encoding - is there any problem with the manifest ?

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  • wp_update_user crashes my plugin for wordpress

    - by Matt Facer
    I am trying to write a plugin which will update a user field. I can use the update user meta function OK, but when I try the wp_update_user it doesnt work. wp_update_user($user_ID, 'user_nicename', 'test'); That crashes the plugin. Do I need to include something for this function to work??

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  • How to listen to keyboard events in GWT table?

    - by Olaf Mertens
    In my GWT program I have a table that has a selected row. I'd like to move the row selection with the up- and down-keys on the keyboard. So I have to catch the key events somehow. The GWT docs handle key events in input fields only. But I don't have an input field! Is this possible at all? Maybe it is a DOM/Javascript restriction that GWT cannot work around...

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  • RESTful web services - best way to return result of an operation?

    - by saille
    I am designing a RESTful API and I would like to know what the most RESTful way is to return details about an operation. E.g. an operation on a resource occurs when some data is POSTed to a URL. HTTP status codes will indicate either success or failure for the operation. But apart from success/failure I need to indicate some other info to the client, such as an ID number. So my question is, should the ID number be returned in an XML document in the response content, or should it be returned in some custom HTTP header fields? Which is more in line with the principles of REST? Or am I free to choose.

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  • How to map Duration type with JPA

    - by HDave
    I have a property field in a class that is of type javax.xml.datatype.Duration. It basically represents a time span (e.g. 4 hours and 34 minutes). JPA is telling me it is an invalid type, which doesn't shock me. Whats a good solution this? I could implement my own Duration class, but I don't know how to get JPA to "accept" it as a datatype.

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  • Injecting Annotated Bean into Regular Bean

    - by jboyd
    AppContext.xml <bean id="myBean" class="com.myapp.MyClass"> <property ref="myService"/> </bean> MyService.java @Service public class MyService { ... } This will throw an exception stating that no bean can be found for property "myService", which I understand because it can't be found in the context files, but I can autowire that field in other spring managed beans, but I need to explicitly build the bean in my context because the POJO is not editable in the scope of my project.

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  • long vs. short branches in version control

    - by Vincenzo
    I wonder whether anyone knows some research done with the question "What is good/bad in long/short branches in version control?" I'm specifically interested in academic researches performed in this field. My questions are: What problems (or conflicts) long branches may produce and how to deal with them How to split a big task onto smaller branches/sub-tasks How to coordinate the changes in multiple short branches, related to the same code Thanks in advance for links and suggestions!

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  • ActiveScaffold: How do I set the default value for a drop down list?

    - by Swamy g
    So I have this create form to create schedules where there is a bunch of fields and one of them is seasons. And seasons table has a field called 'is_current' which if set to 1 tells us that it is the current season. When the create form is display , I want the current season to be selected by default in the seasons drop down. Any help will be appreciated. Thanks.

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  • I want to embed my own video files in my page

    - by Vinu
    I used the following codes to embed my videos(swf and flv) in the following code with the player. But this is working fine in ie and not working in firefox. If anyone knows to correct this code for firefox too.. pls help me... <object type="application/x-shockwave-flash" width="400" height="350" wmode="transparent" data="flvplayer.swf?file=**video location**&autoStart=true"> <param name="movie" value="flvplayer.swf?file=**video location**&autoStart=true" /> <param name="wmode" value="transparent" /> </object>

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  • What HTTP redirect status should I use to link offsite?

    - by Matthew Scharley
    While randomly browsing my website via Google, I noticed that it was showing up remote redirects as local files. Now this can be both good and bad, but I'm wondering how can I fix this so it doesn't happen? I'm currently using PHP and header('Location: ... which sends a 302 redirect. Looking over the list of HTTP status codes, I'd take a guess that I should be using 303 redirects to redirect offsite. Is anyone able to help me here, and either confirm/deny this, or tell me what I should be doing instead? Obviously, due to me not being able to tell Google to reindex my site on command, there's issues with being able to test this myself...

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  • Flex ; get the value of RadioButton inside a FormItem

    - by numediaweb
    Hi, I'm working on Flash Builder with latest flex SDK. I have a problem getting the value radioButton of the selceted radio button inside a form: <mx:Form id="form_new_contribution"> <mx:FormItem label="Contribution type" includeIn="project_contributions"> <mx:RadioButtonGroup id="myG" enabled="true" /> <mx:RadioButton id="subtitle" label="subtitle" groupName="{myG}" value="subtitle"/> <mx:RadioButton id="note" label="notes / chapters" groupName="{myG}" value="note"/> </mx:FormItem> </mx:Form> the function is: protected function button_add_new_clickHandler(event:MouseEvent):void{ Alert.show(myG.selectedValue.toString()); } I tried also: Alert.show(myG.selection.toString()); bothe codes show error: TypeError: Error #1009: Cannot access a property or method of a null object reference. and if It only works if I put : Alert.show(myG.toString()); it alerts : Object RadioButtonGroup thanx for any hints, and sorry for the long message :)

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  • Warning: Cannot modify header information - headers already sent

    - by Pankaj Khurana
    Hi, I am using code available on http://www.forosdelweb.com/f18/zip-lib-php-archivo-zip-vacio-431133/ for creating zip file. First file-zip.lib.php <?php /* $Id: zip.lib.php,v 1.1 2004/02/14 15:21:18 anoncvs_tusedb Exp $ */ // vim: expandtab sw=4 ts=4 sts=4: /** * Zip file creation class. * Makes zip files. * * Last Modification and Extension By : * * Hasin Hayder * HomePage : www.hasinme.info * Email : [email protected] * IDE : PHP Designer 2005 * * * Originally Based on : * * http://www.zend.com/codex.php?id=535&single=1 * By Eric Mueller <[email protected]> * * http://www.zend.com/codex.php?id=470&single=1 * by Denis125 <[email protected]> * * a patch from Peter Listiak <[email protected]> for last modified * date and time of the compressed file * * Official ZIP file format: http://www.pkware.com/appnote.txt * * @access public */ class zipfile { /** * Array to store compressed data * * @var array $datasec */ var $datasec = array(); /** * Central directory * * @var array $ctrl_dir */ var $ctrl_dir = array(); /** * End of central directory record * * @var string $eof_ctrl_dir */ var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; /** * Last offset position * * @var integer $old_offset */ var $old_offset = 0; /** * Converts an Unix timestamp to a four byte DOS date and time format (date * in high two bytes, time in low two bytes allowing magnitude comparison). * * @param integer the current Unix timestamp * * @return integer the current date in a four byte DOS format * * @access private */ function unix2DosTime($unixtime = 0) { $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime); if ($timearray['year'] < 1980) { $timearray['year'] = 1980; $timearray['mon'] = 1; $timearray['mday'] = 1; $timearray['hours'] = 0; $timearray['minutes'] = 0; $timearray['seconds'] = 0; } // end if return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) | ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1); } // end of the 'unix2DosTime()' method /** * Adds "file" to archive * * @param string file contents * @param string name of the file in the archive (may contains the path) * @param integer the current timestamp * * @access public */ function addFile($data, $name, $time = 0) { $name = str_replace('', '/', $name); $dtime = dechex($this->unix2DosTime($time)); $hexdtime = 'x' . $dtime[6] . $dtime[7] . 'x' . $dtime[4] . $dtime[5] . 'x' . $dtime[2] . $dtime[3] . 'x' . $dtime[0] . $dtime[1]; eval('$hexdtime = "' . $hexdtime . '";'); $fr = "\x50\x4b\x03\x04"; $fr .= "\x14\x00"; // ver needed to extract $fr .= "\x00\x00"; // gen purpose bit flag $fr .= "\x08\x00"; // compression method $fr .= $hexdtime; // last mod time and date // "local file header" segment $unc_len = strlen($data); $crc = crc32($data); $zdata = gzcompress($data); $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug $c_len = strlen($zdata); $fr .= pack('V', $crc); // crc32 $fr .= pack('V', $c_len); // compressed filesize $fr .= pack('V', $unc_len); // uncompressed filesize $fr .= pack('v', strlen($name)); // length of filename $fr .= pack('v', 0); // extra field length $fr .= $name; // "file data" segment $fr .= $zdata; // "data descriptor" segment (optional but necessary if archive is not // served as file) $fr .= pack('V', $crc); // crc32 $fr .= pack('V', $c_len); // compressed filesize $fr .= pack('V', $unc_len); // uncompressed filesize // add this entry to array $this -> datasec[] = $fr; // now add to central directory record $cdrec = "\x50\x4b\x01\x02"; $cdrec .= "\x00\x00"; // version made by $cdrec .= "\x14\x00"; // version needed to extract $cdrec .= "\x00\x00"; // gen purpose bit flag $cdrec .= "\x08\x00"; // compression method $cdrec .= $hexdtime; // last mod time & date $cdrec .= pack('V', $crc); // crc32 $cdrec .= pack('V', $c_len); // compressed filesize $cdrec .= pack('V', $unc_len); // uncompressed filesize $cdrec .= pack('v', strlen($name) ); // length of filename $cdrec .= pack('v', 0 ); // extra field length $cdrec .= pack('v', 0 ); // file comment length $cdrec .= pack('v', 0 ); // disk number start $cdrec .= pack('v', 0 ); // internal file attributes $cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header $this -> old_offset += strlen($fr); $cdrec .= $name; // optional extra field, file comment goes here // save to central directory $this -> ctrl_dir[] = $cdrec; } // end of the 'addFile()' method /** * Dumps out file * * @return string the zipped file * * @access public */ function file() { $data = implode('', $this -> datasec); $ctrldir = implode('', $this -> ctrl_dir); return $data . $ctrldir . $this -> eof_ctrl_dir . pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk" pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall pack('V', strlen($ctrldir)) . // size of central dir pack('V', strlen($data)) . // offset to start of central dir "\x00\x00"; // .zip file comment length } // end of the 'file()' method /** * A Wrapper of original addFile Function * * Created By Hasin Hayder at 29th Jan, 1:29 AM * * @param array An Array of files with relative/absolute path to be added in Zip File * * @access public */ function addFiles($files /*Only Pass Array*/) { foreach($files as $file) { if (is_file($file)) //directory check { $data = implode("",file($file)); $this->addFile($data,$file); } } } /** * A Wrapper of original file Function * * Created By Hasin Hayder at 29th Jan, 1:29 AM * * @param string Output file name * * @access public */ function output($file) { $fp=fopen($file,"w"); fwrite($fp,$this->file()); fclose($fp); } } // end of the 'zipfile' class ?> My second file newzip.php <? include("zip.lib.php"); $ziper = new zipfile(); $ziper->addFiles(array("index.htm")); //array of files // the next three lines force an immediate download of the zip file: header("Content-type: application/octet-stream"); header("Content-disposition: attachment; filename=test.zip"); echo $ziper -> file(); ?> I am getting this warning while executing newzip.php Warning: Cannot modify header information - headers already sent by (output started at E:\xampp\htdocs\demo\zip.lib.php:233) in E:\xampp\htdocs\demo\newzip.php on line 6 I am unable to figure out the reason for the same. Please help me on this. Thanks

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  • Commercial uses for grid computing?

    - by paxdiablo
    I keep hearing from associates about grid computing which, from what I can gather, is highly distributed stuff along the lines of SETI@Home. Is anyone working on these sort of systems for business use? My interest is in figuring out if there's a commercial reason for starting software development in this field.

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  • Django model fields getter / setter

    - by pistacchio
    Hi, is there something like getters and setters for django model's fields? For example, I have a text field in which i need to make a string replace before it get saved (in the admin panel, for both insert and update operations) and make another, different replace each time it is read. Those string replace are dynamic and need to be done at the moment of saving and reading. As I'm using python 2.5, I cannot use python 2.6 getters / setters. Any help?

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  • Using Website Information Without WebView

    - by Mr. Monkey
    I am very new to this, and I more looking for what information I need to study to be able to accomplish this. What I want to do is use my GUI I have built for my app, but pull the information from a website. If I have a website that looks like this: (Sorry, can't post pics yet) http:// dl.dropbox.com/u/7037695/ErrorCodeApp/FromWebsite.PNG (full website can be seen at http://www.atmequipment.com/Error-Codes) What would I need from the website so that if a user entered an error code here: http:// dl.dropbox.com/u/7037695/ErrorCodeApp/InApp.PNG It would use the search from the website, and populate the error description in my app? I know this is a huge question, I'm just looking for what is actually needed to accomplish this, and then I can start researching from there. -- Or is it even possible?

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  • Convert SQL server datetime fields to compare date parts only, with indexed lookups

    - by Caveatrob
    I've been doing a convert(varchar,datefield,112) on each date field that I'm using in 'between' queries in SQL server to ensure that I'm only accounting for dates and not missing any based on the time part of datetime fields. Now, I'm hearing that the converts aren't indexable and that there are better methods, in SQL Server 2005, to compare the date part of datetimes in a query to determine if dates fall in a range. What is the optimal, indexable, method of doing something like this: select * from appointments where appointmentDate='08-01-2008' and appointmentDate<'08-15-2008'

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  • problem with date in sql CE

    - by Gold
    i have sqlCE DataBase, i have Tdate field (datetime) i notice that his format is: MM/DD/YYYY in my C# program i work with date in: DD/MM/YYYY format. how i can insert to my sqlCE data base my C# format ?

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  • How do I get selected background color from SecondView to pass to FirstView?

    - by rob
    I am going insane! This is a simple app with two Views. FirstView is a text field with info button to flip to SecondView. In SecondView I have 6 buttons for background color choice. When button is pushed the color of background changes perfectly but cannot make it also change background color for FirstView. Any help would be GREAT! Thanks! I am using Objective C class working on a iPhone app. Sorry new at this. The SecondView acts almost like a settings page in the fact that when a button is pushed the background color changes to the button color. I need it so when I push the "back" button to go back to FirstView the background color has also changed to that color choice. Been thru sooooooooo many tutorials and codes that now I am totally lost......... Thanks again!

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  • Jquery to find a name on html page and add hyperlink

    - by mikejones12
    Here is my example: I have a a website that contains the following: <body> Jim Nebraska zipcode 65437 Tony lives in California his zipcode is 98708 </body> I would like to be able to search for zip codes on the page and wrap them with hyperlinks like: <body> Jim Nebraska zipcode <a href="/65437.htm">65437</a> Tony lives in California his zipcode is <a href="/65437.htm">98708</a> </body> Could I use a regex selector to find the string and then wrap the string, or replace it with the new hyperlink? I am new to Jquery and looking for someone to point me in the right direction. Thank you, Mike

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