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Oracle Open World - the technologist's fall classic

- by user581320

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} Well its September and the calendar is charging towards fall. I realized today that another summer had passed as the first rain in months fell here in northern California redwood country. If its fall that means that Oracle Open World is right around the corner and that tens of thousands of technology professionals will soon converge on San Francisco to fill every hotel and every corner of their minds. As in years past, team UPK will be there in force to answer questions, demo and discuss all things UPK. On Thursday, October 4, from 12:45pm to 1:45pm I along with several of my UPK teammates will be manning the User Productivity Kit Panel - Best Practices to Manage and Deploy Content. This session is an interactive session intended as an opportunity to get your UPK questions answered. To get things started we will answer some questions submitted in advance. If you have any questions or subject areas you’d like addressed during the session, let me know here in the blog and then come to the session and we’ll do our best to answer your questions. Peter Maravelias UPK Product Management

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local msmtp and ovh hosting

- by klez

I have my personal email hosted on OVH (personal hosting plan) and I'm not able to send mails using msmtp. Here's a typical session ignoring system configuration file /etc/msmtprc: File o directory non esistente loaded user configuration file /home/klez/.msmtprc using account default from /home/klez/.msmtprc host = ssl0.ovh.net port = 465 timeout = off protocol = smtp domain = localhost auth = choose user = federicoculloca%xxxxxxx password = * ntlmdomain = (not set) tls = on tls_starttls = off tls_trust_file = (not set) tls_crl_file = (not set) tls_fingerprint = (not set) tls_key_file = (not set) tls_cert_file = (not set) tls_certcheck = off tls_force_sslv3 = off tls_min_dh_prime_bits = (not set) tls_priorities = (not set) auto_from = off maildomain = (not set) from = federicoculloca@xxxxxxxx dsn_notify = (not set) dsn_return = (not set) keepbcc = off logfile = (not set) syslog = (not set) reading recipients from the command line TLS certificate information: Owner: Common Name: ssl0.ovh.net Organizational unit: Domain Control Validated Issuer: Common Name: OVH Secure Certification Authority Organization: OVH SAS Organizational unit: Low Assurance Country: FR Validity: Activation time: lun 31 gen 2011 01:00:00 CET Expiration time: mer 15 feb 2012 00:59:59 CET Fingerprints: SHA1: F9:DC:41:F9:A2:38:51:9B:56:E4:98:E6:CD:81:31:42:E6:0E:26:6D MD5: FC:EC:F3:8F:28:E4:7E:28:99:89:E6:BB:C9:DF:71:CE <-- 220 ns0.ovh.net ssl0.ovh.net. You connect to mail427.ha.ovh.net ESMTP --> EHLO localhost <-- 250-ssl0.ovh.net. You connect to mail427.ha.ovh.net <-- 250-AUTH LOGIN PLAIN <-- 250-AUTH=LOGIN PLAIN <-- 250-PIPELINING <-- 250-8BITMIME <-- 250 SIZE 109000000 --> AUTH PLAIN xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx <-- 235 ok, go ahead (#2.0.0) --> MAIL FROM:<federicoculloca@xxxxx> --> RCPT TO:<[email protected]> --> DATA <-- 250 ok <-- 250 ok <-- 354 go ahead --> hello world --> . <-- 554 mail server permanently rejected message (#5.3.0) And my configuration # ~/.msmtp # Mostly from Peter Garrett's examples # https://lists.ubuntu.com/archives/ubuntu-users/2007-September/122698.html # Accounts from Scott Robbins' `A Quick Guide to Mutt' # http://home.nyc.rr.com/computertaijutsu/mutt.html account xxxxx host ssl0.ovh.net from federicoculloca@xxxxxx auth on user federicoculloca%xxxxxx password xxxxxx tls on tls_certcheck off tls_starttls off Any idea?

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Server appears to have lost ability to read PHP files with LAMP

- by OtagoHarbour

I have LAMP installed on a PC that is running Ubuntu 11.10. LAMP was running fine but I had to restart the PC because Unity was messing up (as it often does) and the tool bar had disappeared. When it started up, I was unable to fire up any php files. I have a file index.php in /var/www. It is owned by www-data as is the directory that it is in. The LAN address of the server is 192.168.1.10. However when I type 192.168.1.10 into the URL box on Mozilla FireFox, I get Unable to connect Firefox can't establish a connection to the server at 192.168.1.10 This server is connected to another server on the LAN that has the LAN address 192.168.1.4. When I type 192.168.1.4 into the Firefow URL box on 192.168.1.10, I see the display associated with index.php on 192.168.1.4. Why can it not display its own /var/www/index.php? Any assistance with this would be greatly appreciated, Peter.

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Set up multiple websites on a local web server

- by mickburkejnr

I have spent the last few days setting up a CentOS 6 server on my local network so that I can host multiple projects that I'm currently working on. Everything has been set up so that I access the server by typing 192.168.1.10 and the Apache test page comes up. What I'm aiming to do is to access different projects by typing in 192.168.1.10/project, and then view the project as if it was on it's own standalone server. I have thought about just sticking these sites inside folders on the server then accessing them that way, but a lot of my projects use CakePHP so this isn't feasible. So what I need to do is create VirtualHosts in Apache to allow me to do this, but without using a domain name. I want to stick to using the IP address of the machine (which is static). Any ideas? EDIT I've followed Peter's suggestion, but now I have a new problem. In the httpd.conf file I have entered the following information: NameVirtualHost *:80 <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /www/html/project1 ServerName local.project1.com ErrorLog logs/local.project1.com-error_log CustomLog logs/local.project1.com-access_log common </VirtualHost> And now Apache is saying: Starting httpd: Warning: DocumentRoot [/www/html/project1] does not exist When it clearly does exist. I've disabled SELinux and I can confirm this isn't turned on. I've also checked the ownership of the folder, and its owned by root. I can also save files to these folders using a guest FTP account (which isn't associated to root), so the folders are being listed and can be written to. But when I try the folder in a web browser it doesn't seem to work either. I've also done a reboot of the server and the problem persists. What should I change in order to resolve this?

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how to do asynchronous http requests with epoll and python 3.1

- by flow

there is an interesting page http://scotdoyle.com/python-epoll-howto.html about how to do asnchronous / non-blocking / AIO http serving in python 3. there is the tornado web server which does include a non-blocking http client. i have managed to port parts of the server to python 3.1, but the implementation of the client requires pyCurl and seems to have problems (with one participant stating how ‘Libcurl is such a pain in the neck’, and looking at the incredibly ugly pyCurl page i doubt pyCurl will arrive in py3+ any time soon). now that epoll is available in the standard library, it should be possible to do asynchronous http requests out of the box with python. i really do not want to use asyncore or whatnot; epoll has a reputation for being the ideal tool for the task, and it is part of the python distribution, so using anything but epoll for non-blocking http is highly counterintuitive (prove me wrong if you feel like it). oh, and i feel threading is horrible. no threading. i use stackless. people further interested in the topic of asynchronous http should not miss out on this talk by peter portante at PyCon2010; also of interest is the keynote, where speaker antonio rodriguez at one point emphasizes the importance of having up-to-date web technology libraries right in the standard library.

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Spring-json problem in Liferay with Spring 2.5

- by Jesus Benito

Hi all, I am trying to use the library spring-json.1.3.1 in a project that has been done with Liferay 5.1.2 which includes Spring 2.5. Following the project website instructions, I managed to make the request hit in my controller, but at the moment of returning the json object back through the modelAndView object it fails with the following error: java.lang.IllegalArgumentException at com.liferay.portlet.MimeResponseImpl.setContentType(MimeResponseImpl.java:162) I have checked Liferays source code, and it checks that contentType that its being set is in a harcoded list,if it not it will throw a IllegalArgumentException that it is exactly what os happening. This is my view resolver code: <bean id="xmlFileViewResolver" class="org.springframework.web.servlet.view.XmlViewResolver"> /WEB-INF/context/views.xml 1 My views.xml code: <beans> <bean name="jsonView" class="org.springframework.web.servlet.view.json.JsonView"/> And my controller: @SuppressWarnings("unchecked") @Override public ModelAndView handleRenderRequest(RenderRequest arg0, RenderResponse arg1) throws Exception { Map model = new HashMap(); model.put("firstname", "Peter"); model.put("secondname", "Schmitt"); return new ModelAndView("jsonView", model); } Any ideas?

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Filtering documents against a dictionary key in MongoDB

- by Thomas

I have a collection of articles in MongoDB that has the following structure: { 'category': 'Legislature', 'updated': datetime.datetime(2010, 3, 19, 15, 32, 22, 107000), 'byline': None, 'tags': { 'party': ['Peter Hoekstra', 'Virg Bernero', 'Alma Smith', 'Mike Bouchard', 'Tom George', 'Rick Snyder'], 'geography': ['Michigan', 'United States', 'North America'] }, 'headline': '2 Mich. gubernatorial candidates speak to students', 'text': [ 'BEVERLY HILLS, Mich. (AP) \u2014 Two Democratic and Republican gubernatorial candidates found common ground while speaking to private school students in suburban Detroit', "Democratic House Speaker state Rep. Andy Dillon and Republican U.S. Rep. Pete Hoekstra said Friday a more business-friendly government can help reduce Michigan's nation-leading unemployment rate.", "The candidates were invited to Detroit Country Day Upper School in Beverly Hills to offer ideas for Michigan's future.", 'Besides Dillon, the Democratic field includes Lansing Mayor Virg Bernero and state Rep. Alma Wheeler Smith. Other Republicans running are Oakland County Sheriff Mike Bouchard, Attorney General Mike Cox, state Sen. Tom George and Ann Arbor business leader Rick Snyder.', 'Former Republican U.S. Rep. Joe Schwarz is considering running as an independent.' ], 'dateline': 'BEVERLY HILLS, Mich.', 'published': datetime.datetime(2010, 3, 19, 8, 0, 31), 'keywords': "Governor's Race", '_id': ObjectId('4ba39721e0e16cb25fadbb40'), 'article_id': 'urn:publicid:ap.org:0611e36fb084458aa620c0187999db7e', 'slug': "BC-MI--Governor's Race,2nd Ld-Writethr" } If I wanted to write a query that looked for all articles that had at least 1 geography tag, how would I do that? I have tried writing db.articles.find( {'tags': 'geography'} ), but that doesn't appear to work. I've also thought about changing the search parameter to 'tags.geography', but am having a devil of a time figuring out what the search predicate would be.

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noSQL/SQL/RoR: Trying to build scalable ratings table for the game

- by alexeypro

I am trying to solve complex thing (as it looks to me). I have next entities: PLAYER (few of them, with names like "John", "Peter", etc.). Each has unique ID. For simplicity let's think it's their name. GAME (few of them, say named "Hide and Seek", "Jump and Run", etc.). Same - each has unique ID. For simplicity of the case let it be it's name for now. SCORE (it's numeric). So, how it works. Each PLAYER can play in multiple GAMES. He gets some SCORE in every GAME. I need to build rating table -- and not one! Table #1: most played GAMES Table #2: best PLAYERS in all games (say the total SCORE in every GAME). Table #3: best PLAYERS per GAME (by SCORE in particularly that GAME). I could be build something straight right away, but that will not work. I will have more than 10,000 players; and 15 games, which will grow for sure. Score can be as low as 0, and as high as 1,000,000 (not sure if higher is possible at this moment) for player in the game. So I really need some relative data. Any suggestions? I am planning to do it with SQL, but may be just using it for key-value storage; anything -- any ideas are welcome. Thank you!

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Learning about the low level

- by Anoners

I'm interested in learning more about the PC from a lower (machine) level. I graduated from a school which taught us concepts using the Java language which abstracted out that level almost completely. As a result I only learned a bit from the one required assembly language course. In order to cram in ASM and quite a few details about architecture, it was hard to get a very deep picture of what is going on there. At work I focus on unix socket programming in C, so i'm much closer to the hardware now, but I feel I should learn a bit more about what streams really are, how memory management and paging works, what goes on when you call "paint()" on a graphics buffer, etc. I missed out on a lot of this and i'm looking for a good resource to get me started. I've heard a lot about the "Pink Book" by Peter Norton (Programmer's Guide to the IBM PC, Programmer's Guide to inside the PC, etc). It seems like this is on the right track, however the original is quite out dated and the newer ones have had conflicting reviews, with many people saying to stay away from it. I'm not sure what the SO crowd thinks about this book or if they have some suggestions for similar books, online resources, etc that may be good primers for this sort of thing. Any suggestions would be appreciated.

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Previously working emberjs1.0-pre form on jsfiddle returns "error": "Please use POST request"

- by brg

This code ** http://jsfiddle.net/wagenet/ACzaJ/8/ ** was working a few days ago, when i returned to it today, it throws {"error": "Please use POST request"}, when i click add button Also the jsfiddle editor.js always throws exception on this line: function stop(){cc = stop; throw StopIteration;}; Does anyone knows the cause of this issue. Many thanks Update 1 Based on @Peter Wagenet's suggestions below, the form now logs entries or inputs to the console but it doesn't display on the result section of jsfiddle instead what is displayed on jsfiddle result section or page is still this error {"error": "Please use POST request"} ** http://jsfiddle.net/ACzaJ/18/ Update 2 In this fiddle, http://jsfiddle.net/ACzaJ/19/, i have successfully eliminated this error {"error": "Please use POST request"} by adding event.preventDefault(); to the submit action in Todos.TodoFormView. That allows us to use arbitrary view methods as action handlers. The existing issue is that the input to the form, only displays on the console and not on jsfiddle result section, though no error displays on the result section, there is a new error appearing in the console of the updated fiddle: Uncaught Error: Cannot perform operations on a Metamorph that is not in the DOM. Finally solved I needed to comment out App.initialize() for it to work as expected. This the working fiddle ** http://jsfiddle.net/ACzaJ/20/. I don't know why that is so, but my guess is that, App.initialize works with other parts like the router for routing, ApplicationController and ApplicationView with {{outlet}} in the handlebars, which i didn't need for this fiddle. Finally Finally and completely solved This ** http://jsfiddle.net/tQWn8/ works with App.initialize. But you have to declare all those components above and pass the router to App.initialize, like this App..initialize(router). If you don't do this, then you will get the old error Uncaught Error: Cannot perform operations on a Metamorph that is not in the DOM.

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paypal address1 HTML name doensnt work?

- by ajsie

i use this code to send the customer to the paypals payment page: <form action="https://www.paypal.com/cgi-bin/webscr" method="post"> <input type='hidden' name='cmd' value='_cart' /> <input type='hidden' name='upload' value='1' /> <input type="hidden" name="business" value="[email protected]"> <input type="hidden" name="currency_code" value="SEK"> <input type="hidden" name="return" value="http://freelanceswitch.com/payment-complete/"> <input type="hidden" name="item_number_1" value="01 - General Payment"> <input type="hidden" name="item_name_1" size="45"> <input type="hidden" name="amount_1" size="45"> <input type="hidden" name="item_number_2" value="01 - Bonus Payment"> <input type="hidden" name="item_name_2" size="45"> <input type="hidden" name="amount_2" size="45">  <input type='hidden' name='address1' value='Open Bridge street 19' /> <input type='hidden' name='address2' value='Easter heaven garden 12' /> <input type='hidden' name='first_name' value='Peter' /> <input type='hidden' name='last_name' value='Hansen' /> <input type="submit" name="Submit" value="Submit"> </form> everything works except the address1 and address2 in PREPOPULATING FIELDS. the fields for the Billing Address Line 1 and Billing Address Line 2 are empty. anyone knows why?

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Use jquery to create a multidimensional array

- by Simon M White

I'd like to use jquery and a multidemensional array to show a random quote plus the name of the individual who wrote it as a separate item. I'll then be able to use css to style them differently. The quote will change upon page refresh. So far i have this code which combines the quote and the name and person who wrote it: $(document).ready(function(){ var myQuotes = new Array(); myQuotes[0] = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec in tortor mauris. Peter Jones, Dragons Den"; myQuotes[1] = "Curabitur interdum, nibh et fringilla facilisis, lacus ipsum pulvinar mauris, eu facilisis justo arcu eget diam. Duis id sagittis elit. Theo Pathetis, Dragons Den"; myQuotes[2] = "Vivamus purus purus, tincidunt et porttitor et, euismod sit amet urna. Etiam sollicitudin eros nec metus pretium scelerisque. James Caan, Dragons Den"; var myRandom = Math.floor(Math.random()*myQuotes.length); $('.quote-holder blockquote span').html(myQuotes[myRandom]); }); any help would be greatly appreciated.

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Linux Lightweight Distro and X Windows for Development

- by Fernando Barrocal

Heyall... I want to build a lightweight linux configuration to use for development. The first idea is to use it inside a Virtual Machine under Windows, or old Laptops with 1Gb RAM top. Maybe even a distributable environment for developers. So the whole idea is to use a LAMP server, Java Application Server (Tomcat or Jetty) and X Windows (any Window manager, from FVWM to Enlightment), Eclipse, maybe jEdit and of course Firefox. Edit: I am changing this post to compile a possible list of distros and window managers that can be used to configure a real lightweight development environment. I am using as base personal experiences on this matter. Info about the distros can be easily found in their sites. So please, focus on personal use of those systems Distros Ubuntu / Xubuntu Pros: Personal Experience in old systems or low RAM environment - @Schroeder, @SCdF Several sugestions based on personal knowledge - @Kyle, @Peter Hoffmann Gentoo Pros: Not targeted to Desktop Users - @paan Don't come with a huge ammount of applications - @paan Slackware Pros: Suggested as best performance in a wise install/configuration - @Ryan Damn Small Linux Pros: Main focus is the lightweight factor - 50MB LiveCD - @Ryan Debian Pros: Very versatile, can be configured for both heavy and lightweight computers - @Ryan APT as package manager - @Kyle Based on compatibility and usability - @Kyle -- Fell Free to add Prós and Cons on this, so we can compile a good Reference. -- X Windows suggestion keep coming about XFCE. If others are to add here, open a session for it Like the distro one :)

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Using fgets to read strings from file in C

- by Ivan

I am trying to read strings from a file that has each string on a new line but I think it reads a newline character once instead of a string and I don't know why. If I'm going about reading strings the wrong way please correct me. i=0; F1 = fopen("alg.txt", "r"); F2 = fopen("tul.txt", "w"); if(!feof(F1)) { do{ //start scanning file fgets(inimene[i].Enimi, 20, F1); fgets(inimene[i].Pnimi, 20, F1); fgets(inimene[i].Kood, 12, F1); printf("i=%d\nEnimi=%s\nPnimi=%s\nKaad=%s",i,inimene[i].Enimi,inimene[i].Pnimi,inimene[i].Kood); i++;} while(!feof(F1));}; /*finish getting structs*/ The printf is there to let me see what was read into what and here is the result i=0 Enimi=peter Pnimi=pupkin Kood=223456iatb i=1 Enimi= Pnimi=masha Kaad=gubkina i=2 Enimi=234567iasb Pnimi=sasha Kood=dudkina As you can see after the first struct is read there is a blank(a newline?) onct and then everything is shifted. I suppose I could read a dummy string to absorb that extra blank and then nothing would be shifted, but that doesn't help me understand the problem and avoid in the future.

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Create a HTML table from nested maps (and vectors)

- by Kenny164

I'm trying to create a table (a work schedule) I have coded previously using python, I think it would be a nice introduction to the Clojure language for me. I have very little experience in Clojure (or lisp in that matter) and I've done my rounds in google and a good bit of trial and error but can't seem to get my head around this style of coding. Here is my sample data (will be coming from an sqlite database in the future): (def smpl2 (ref {"Salaried" [{"John Doe" ["12:00-20:00" nil nil nil "11:00-19:00"]} {"Mary Jane" [nil "12:00-20:00" nil nil nil "11:00-19:00"]}] "Shift Manager" [{"Peter Simpson" ["12:00-20:00" nil nil nil "11:00-19:00"]} {"Joe Jones" [nil "12:00-20:00" nil nil nil "11:00-19:00"]}] "Other" [{"Super Man" ["07:00-16:00" "07:00-16:00" "07:00-16:00" "07:00-16:00" "07:00-16:00"]}]})) I was trying to step through this originally using for then moving onto doseq and finally domap (which seems more successful) and dumping the contents into a html table (my original python program outputed this from a sqlite database into an excel spreadsheet using COM). Here is my attempt (the create-table fn): (defn html-doc [title & body] (html (doctype "xhtml/transitional") [:html [:head [:title title]] [:body body]])) (defn create-table [] [:h1 "Schedule"] [:hr] [:table (:style "border: 0; width: 90%") [:th "Name"][:th "Mon"][:th "Tue"][:th "Wed"] [:th "Thur"][:th "Fri"][:th "Sat"][:th "Sun"] [:tr (domap [ct @smpl2] [:tr [:td (key ct)] (domap [cl (val ct)] (domap [c cl] [:tr [:td (key c)]]))]) ]]) (defroutes tstr (GET "/" ((html-doc "Sample" create-table))) (ANY "*" 404)) That outputs the table with the sections (salaried, manager, etc) and the names in the sections, I just feel like I'm abusing the domap by nesting it too many times as I'll probably need to add more domaps just to get the shift times in their proper columns and the code is getting a 'dirty' feel to it. I apologize in advance if I'm not including enough information, I don't normally ask for help on coding, also this is my 1st SO question :). If you know any better approaches to do this or even tips or tricks I should know as a newbie, they are definitely welcome. Thanks.

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Lazy non-modifiable list in Google Collections

- by mindas

I was looking for a decent implementation of a generic lazy non-modifiable list implementation to wrap my search result entries. The unmodifiable part of the task is easy as it can be achieved by Collections.unmodifiableList() so I only need to sort out the the lazy part. Surprisingly, google-collections doesn't have anything to offer; while LazyList from Apache Commons Collections does not support generics. I have found an attempt to build something on top of google-collections but it seems to be incomplete (e.g. does not support size()), outdated (does not compile with 1.0 final) and requiring some external classes, but could be used as a good starting point to build my own class. Is anybody aware of any good implementation of a LazyList? If not, which option do you think is better: write my own implementation, based on google-collections ForwardingList, similar to what Peter Maas did; write my own wrapper around Commons Collections LazyList (the wrapper would only add generics so I don't have to cast everywhere but only in the wrapper itself); just write something on top of java.util.AbstractList; Any other suggestions are welcome.

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Capturing time intervals when somebody was online? How would you impement this feature?

- by Kirzilla

Hello, Our aim is to build timelines saying about periods of time when user was online. (It really doesn't matter what user we are talking about and where he was online) To get information about onliners we can call API method, someservice.com/api/?call=whoIsOnline whoIsOnline method will give us a list of users currently online. But there is no API method to get information about who IS NOT online. So, we should build our timelines using information we got from whoIsOnline. Of course there will be a measurement error (we can't track information in realtime). Let's suppose that we will call whoIsOnline method every 2 minutes (yes, we will run our script by cron every 2 minutes). For example, calling whoIsOnline at 08:00 will return Peter_id Michal_id Andy_id calling whoIsOnline at 08:02 will return Michael_id Andy_id George_id As you can see, Peter has gone offline, but we have new onliner - George. Available instruments are Db(MySQL) / text files / key-value storage (Redis/memcache); feel free to choose any of them (or even all of them). So, we have to get information like this George_id was online... 12 May: 08:02-08:30, 12:40-12:46, 20:14-22:36 11 May: 09:10-12:30, 21:45-23:00 10 May: was not online And now question... How would you store information to implement such timelines? How would you query/calculate information about periods of time when user was online? Additional information.. You cannot update information about offline users, only users who are "currently" online. Solution should be flexible: timeline information could be represented relating to any timezone. We should keep information only for last 7 days. Every user seen online is automatically getting his own identifier in our database. Uff.. it was really hard for me to write it because my English is pretty bad, but I hope my question will be clear for you. Thank you.

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Fast sign in C++ float...are there any platform dependencies in this code?

- by Patrick Niedzielski

Searching online, I have found the following routine for calculating the sign of a float in IEEE format. This could easily be extended to a double, too. // returns 1.0f for positive floats, -1.0f for negative floats, 0.0f for zero inline float fast_sign(float f) { if (((int&)f & 0x7FFFFFFF)==0) return 0.f; // test exponent & mantissa bits: is input zero? else { float r = 1.0f; (int&)r |= ((int&)f & 0x80000000); // mask sign bit in f, set it in r if necessary return r; } } (Source: ``Fast sign for 32 bit floats'', Peter Schoffhauzer) I am weary to use this routine, though, because of the bit binary operations. I need my code to work on machines with different byte orders, but I am not sure how much of this the IEEE standard specifies, as I couldn't find the most recent version, published this year. Can someone tell me if this will work, regardless of the byte order of the machine? Thanks, Patrick

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How to make a small flash swf with ComboBox in Actionscript 3?

- by Sint

I have a pure Actionscript 3 project, using flash.* libraries, compiles down to about 6k (using mxmlc). Program handles about 1k shapes, a few sprites, a sockets connection, works great (tastes less filling). Now, how would I add a ComboBox control without incurring excessive bloat? More specificially, I would like to keep the size under 100k. So far I have tried: Adobe mx.controls ComboBoxexample - simple mxml example compiles to 200+k both on my main Linux Box using mxmlc and in Windows using Flash Builder 4 Yahoo Astra - uses mx libraries underneath(so as bloated as Adobe?), plus does not contain exact ComboBox Keith Peter's MinimalComps - seems small, but far from providing ComboBox functionality SPAS (Swing Package for Actionscript) - compiles to 130k, but alpha version of ComboBox does not let me adjust height... asuilib - compiles to 40k, unfortunately this ComboBox does not provide for scrolling items...if it does not fit on screen no way to scroll to it Now my questions: Is there a way to lower size for projects importing mx.controls ? Maybe there is a way to fix SPAS or asuilib ComboBoxes? Perhaps, there are some other libraries which provide a ComboBox(or DropList)?

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Lazy non-modifiable list

- by mindas

I was looking for a decent implementation of a generic lazy non-modifiable list implementation to wrap my search result entries. The unmodifiable part of the task is easy as it can be achieved by Collections.unmodifiableList() so I only need to sort out the the lazy part. Surprisingly, google-collections doesn't have anything to offer; while LazyList from Apache Commons Collections does not support generics. I have found an attempt to build something on top of google-collections but it seems to be incomplete (e.g. does not support size()), outdated (does not compile with 1.0 final) and requiring some external classes, but could be used as a good starting point to build my own class. Is anybody aware of any good implementation of a LazyList? If not, which option do you think is better: write my own implementation, based on google-collections ForwardingList, similar to what Peter Maas did; write my own wrapper around Commons Collections LazyList (the wrapper would only add generics so I don't have to cast everywhere but only in the wrapper itself); just write something on top of java.util.AbstractList; Any other suggestions are welcome.

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Java problem with multiple threads when executing a runnable jar file

- by Spi1988

I have developed a Java Swing application, which uses the SwingWorker class to perform some long running tasks. When the application is run from the IDE (Netbeans), I can start multiple long running tasks simultaneously without any problem. I created a runnable jar file for the application, in order to be able to run it from outside the IDE. The application when run from this jar file works well with the only exception that it doesn't allow me to start 2 long running tasks simultaneously. When I start the first task (assume it takes 2 minitues to complete), every thing works fine, the UI does not freeze (it never freezes). However, when I try to run another task (assume it takes just 10 seconds, therefore it should finish before the first task) while the first task has not yet completed, nothing seems to happen. In reality, the second task would have started, and also finished its processing, however its results are only displayed once the first task completes. I dunno why this is happening. Is there some restriction on the number of threads which could run simultaneously on the JVM? Are there any jvm arguments which i could try to solve this problem. I hope i explained my problem well. Thanks in advance, Peter Bartolo

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Google Analytics - Goals - Advanced Segments - Does it keep cookies for tracking visitors?

- by Kuko

Hi there, I am working with Google Analytics - Goals and Funnels for quite sometime, but one thing is is not clear for me. I would very much appreciate if you could help me. We are advertising on several sites rotating several different ads. Our main goal is to collect as many sign-ups (new users) as possible for as low price as possible. We use to advertise the way, that each ad has the same URL where to land, but contains different parameter (e.g. http://www.brautpunkt.de/?ref=fb01 or ..... .de/?ref=adw03). My question is: If I am looking at the goals (Goals Overview), filtering it through Advanced Segments (Landing Page contains /?ref=fb01) is this subset of goals done only by the users who registered in the same session after they came on our site directly from the ad? or also by those users who came first time through this ad (/?ref=fb01), didn't register in the same session but came directly for example on the other day and register than? Thank you very much in advance for your advice. Peter

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Group / User based security. Table / SQL question

- by Brett

Hi, I'm setting up a group / user based security system. I have 4 tables as follows: user groups group_user_mappings acl where acl is the mapping between an item_id and either a group or a user. The way I've done the acl table, I have 3 columns of note (actually 4th one as an auto-id, but that is irrelevant) col 1 item_id (item to access) col 3 user_id (user that is allowed to access) col 3 group_id (group that is allowed to access) So for example item1, peter, , item2, , group1 item3, jane, , so either the acl will give access to a user or a group. Any one line in the ACL table with either have an item - user mapping, or an item group. If I want to have a query that returns all objects a user has access to, I think I need to have a SQL query with a UNION, because I need 2 separate queries that join like.. item - acl - group - user AND item - acl - user This I guess will work OK. Is this how its normally done? Am I doing this the right way? Seems a little messy. I was thinking I could get around it by creating a single user group for each person, so I only ever deal with groups in my SQL, but this seems a little messy as well..

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Help me write my LISP :) LISP environments, Ruby Hashes...

- by MikeC8

I'm implementing a rudimentary version of LISP in Ruby just in order to familiarize myself with some concepts. I'm basing my implementation off of Peter Norvig's Lispy (http://norvig.com/lispy.html). There's something I'm missing here though, and I'd appreciate some help... He subclasses Python's dict as follows: class Env(dict): "An environment: a dict of {'var':val} pairs, with an outer Env." def __init__(self, parms=(), args=(), outer=None): self.update(zip(parms,args)) self.outer = outer def find(self, var): "Find the innermost Env where var appears." return self if var in self else self.outer.find(var) He then goes on to explain why he does this rather than just using a dict. However, for some reason, his explanation keeps passing in through my eyes and out through the back of my head. Why not use a dict, and then inside the eval function, when a new "sub-environment" needs to be created, just take the existing dict and update the key/value pairs that need to be updated, and pass that new dict into the next eval? Won't the Python interpreter keep track of the previous "outer" envs? And won't the nature of the recursion ensure that the values are pulled out from "inner" to "outer"? I'm using Ruby, and I tried to implement things this way. Something's not working though, and it might be because of this, or perhaps not. Here's my eval function, env being a regular Hash: def eval(x, env = $global_env) ........ elsif x[0] == "lambda" then ->(*args) { eval(x[2], env.merge(Hash[*x[1].zip(args).flatten(1)])) } ........ end The line that matters of course is the "lambda" one. If there is a difference, what's importantly different between what I'm doing here and what Norvig did with his Env class? If there's no difference, then perhaps someone can enlighten me as to why Norvig uses the Env class. Thanks :)

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DDD: Enum like entities

- by Chris

Hi all, I have the following DB model: **Person table** ID | Name | StateId ------------------------------ 1 Joe 1 2 Peter 1 3 John 2 **State table** ID | Desc ------------------------------ 1 Working 2 Vacation and domain model would be (simplified): public class Person { public int Id { get; } public string Name { get; set; } public State State { get; set; } } public class State { private int id; public string Name { get; set; } } The state might be used in the domain logic e.g.: if(person.State == State.Working) // some logic So from my understanding, the State acts like a value object which is used for domain logic checks. But it also needs to be present in the DB model to represent a clean ERM. So state might be extended to: public class State { private int id; public string Name { get; set; } public static State New {get {return new State([hardCodedIdHere?], [hardCodeNameHere?]);}} } But using this approach the name of the state would be hardcoded into the domain. Do you know what I mean? Is there a standard approach for such a thing? From my point of view what I am trying to do is using an object (which is persisted from the ERM design perspective) as a sort of value object within my domain. What do you think? Question update: Probably my question wasn't clear enough. What I need to know is, how I would use an entity (like the State example) that is stored in a database within my domain logic. To avoid things like: if(person.State.Id == State.Working.Id) // some logic or if(person.State.Id == WORKING_ID) // some logic

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