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final answer to lazy initialization of Java singleton object

2010-05-11T12:42:00.002-04:00

main idea: let Java JVM do the synchronizationstatic class SingletonContainer{ private static Singleton singleton = new Singleton(); public static Singleton getInstance(){ return singleton; }}http://en.wikipedia.org/wiki/Initialization_on_demand_holder_idiom

JavaScript Quine

2010-04-27T16:13:00.002-04:00

If in a browser, replace the "print" with "alert"print((function(){return"print(("+arguments.callee.toString().replace(/\s/g,"")+")())";})())

write content to iframe

2009-04-17T15:27:00.001-04:00

using ifrm.doc.open()/write()/close()But not perfect for IE7 due to some cross-site issue function submitFormByAjax(targetId){ var form = dojo.byId("tab_form"); // save ref to form dojo.xhrPost( { form: form, load: function(data) { // set the form's HTML to be the response

a unified way to display svg in browsers

2009-03-25T12:37:00.001-04:00

1. server side a. using flamingo tool java -cp flamingo-tst.jar:flamingo.jar:batik-all.jar:xml-apis-ext.jar:xml-apis.jar test.svg.SVGApplicaiton to convert SVG to Java2D class file b. The generated Java2D class file can in turn create the JPEG file to be displayed in browser 2. dojo client side using svg2gfx.xsl (dojox.gfx.demos.data) to convert SVG to JSON file which can be rendered by

T42, Ubuntu, Gusty, boot up too slow

2008-09-23T19:44:00.001-04:00

Check /etc/usplash.confAjust the xres and yres to 1024X768then run sudo update-usplash-theme usplash-theme-ubuntuThis should fix the problem-- Pop (Pu Liu)

Re: Ubuntu font problem

2008-08-04T16:07:00.001-04:00

Re: Ugly fonts on UTF-8 encoded Chinese webpages, etc.I just now solved this problem!You should (don't have to) install the firefly font. Google it. It's cleaner and does look better.Then you need to disable antialiasing.I had to create a file called .fonts.conf and place it in my home directory.Here is what the file looks like:<

Re: Ubuntu font problem

2008-08-04T16:05:00.001-04:00

in home directory, create a hidden file .fonts.confwith the following content AR PL New Sung AR PL ShanHeiSun UniAR PL ZenKai UniMing(ISO10646)<

ubuntu, locale generation hangs problem, a fix which works

2008-08-04T14:43:00.001-04:00

Fco Javier Lopez wrote on 2008-07-30: (permalink) There's a easy workaround. The /usr/share/locales/install-language-pack script, used in the postinst of the language-packs packages, invokes /usr/sbin/locale-gen. locale-gen makes some work and finally it executes localedef, that hangs up. Looking the "ps -aux" output,

obscured URL

2008-07-22T15:56:00.001-04:00

http://email.about.com/gi/dynamic/offsite.htm?site=http://www.pc-help.org/obscure.htm In Sum URLs can be obscured at least three ways: Meaningless or deceptive text can be added after "http://" and before an "@" symbol.The domain name can be expressed as an IP address, in dotted-decimal, dword, octal or hexadecimal format; and all of these formats have variants.Characters in the URL can

POST redirect issue in HTTP

2008-07-22T13:40:00.001-04:00

see:http://www.theserverside.com/tt/articles/article.tss?l=RedirectAfterPostt is interesting that PRG pattern exploits non-standard behavior of browsers and web servers. HTTP 1.1 defines several redirect response codes in 3xx range. Some of these codes require browser to use the same request type, some require to change POST to GET, some require to obtain user confirmation when request is

Re: build google desktop sidebar in ubuntu 7.10

2008-07-10T19:29:00.000-04:00

Failed to update gadget metadataFix:sudo aptitude install ca-certificatesOn Thu, Jul 10, 2008 at 7:11 PM, Pu Liu wrote: autoconf >= 2.50 automake >= 1.9 libtool >= 1.5.20 This project also depends on the following libraries: SpiderMonkey >= 1.60 libcurl >= 7.15.0, openssl backend is required libxml2 >= 2.6.0 zlib >= 1.2.0 xulrunner-dev >= 1.8 D-Bus >= 1.0.2 gstreamer

build google desktop sidebar in ubuntu 7.10

2008-07-10T19:11:00.000-04:00

autoconf >= 2.50 automake >= 1.9 libtool >= 1.5.20 This project also depends on the following libraries: SpiderMonkey >= 1.60 libcurl >= 7.15.0, openssl backend is required libxml2 >= 2.6.0 zlib >= 1.2.0 xulrunner-dev >= 1.8 D-Bus >= 1.0.2 gstreamer and gstreamer-plugin-base >= 0.10.0 You can choose from the two toolkits: GTK or QT. If you choose GTK, this project also depends on the

ubuntu Linux settings tips

2008-04-15T12:02:00.000-04:00

1. after cloning the virtualbox vdi, network if names could change"vboxmanage clonevdi src.vdi dest.vdi"this is due to the change of MAC, in order to map the right MAC to ifname "eth0,eth1,...", need to edit"/etc/udev/rules.d/70-persistent-net.rules"For example: notice the address (MAC) and Name (eth0,eth1...)----------------------------------------backup: /etc/udev/rules.d/z25_

How to install MPI in Ubuntu

2008-03-05T18:39:00.000-05:00

1. Go get Ubuntu at http://www.ubuntu.com/getubuntu/download I am using Desktop version version 7.04, Feisty FawnAfter installing ubuntu, basically we will follow the instructions in https://help.ubuntu.com/community/MPICHCluster2. Linux environment setup a. setup NFS server on master node (ub0) a.1 install NFS server sudo apt-get install nfs-kernel-server a.2

android resources

2008-02-26T15:15:00.001-05:00

1. GPShttp://code.google.com/android/toolbox/apis/lbs.html2. Bluetoothhttp://mylifewithandroid.blogspot.com/2008/01/hacking-into-androids-bluetooth-support.html -- Pop (Pu Liu)

regular expression links

2008-01-14T09:41:00.001-05:00

1. ruleshttp://www.zytrax.com/tech/web/regex.htm2.online testhttp://www.fileformat.info/tool/regex.htm -- Pop (Pu Liu)

android xmpp demo

2008-01-04T17:12:00.001-05:00

-- Pop (Pu Liu)

Android, xmpp sample app

2008-01-04T16:53:00.001-05:00

1. Simulator's XMPP settings At first, run the emulator and registered gmail account 'pop.liu@gmail.com' by [Home / App / Dev Tools / XMPP Settings] and made sure the item 'Stay connected to server' was checked. 2. Simulator's im.dbIn order to send data message, you need to inform android that the jid and resource name are 'data message capable'. --- launch adb shell ( /tools/

reference books for good UI design

2008-01-03T10:01:00.001-05:00

1. Alan Dix, Janet Finlay, Gregory D. Abowd, and Russell Beale: Human-Computer Interaction2. Ben Shneiderman and Catherine Plaisant: Designing The User Interface3. Donald A. Norman, The Design Of Everyday Things 4. Jenny Preece, Yvonne Rogers, and Helen Sharp: Interaction Design5. Jef Raskin, The Humane Interface6. Terry Winograd (ed.): Bringing Design to Software7. Brenda Laurel (ed.): The Art

dynamic generate javascript

2007-09-11T10:31:00.001-04:00

1. The htmlPollServer.html (from http://xcrc.ucvhost.com/demo/pollServer.html)My client</ title><script type="text/javascript">var myscript = ' time2.asp';var timer;function reloadScript() { var head = document.getElementsByTagName('head').item(0); var old = document.getElementById('scriptId'); if (old) head.removeChild (old); script = </article> <article> <h1>a link of google interview</h1> <p>2007-09-05T13:10:00.000-04:00</p> http://www.nofluffjuststuff.com/blog/brian_pontarelli/2007/08/google_interviewing.html-- Pop (Pu Liu) </article> <article> <h1>firefox DOM reference</h1> <p>2007-07-30T22:48:00.001-04:00</p> http://developer.mozilla.org/en/docs/Gecko_DOM_Reference </article> <article> <h1>a way to communicate with orphan pop-up window</h1> <p>2007-07-30T21:10:00.001-04:00</p> http://www.1pixelout.net/2005/04/19/cross-window-javascript-communication/ Cross-window Javascript communication This solution is now officially obsolete. A much nicer and simpler solution is available here. This is a solution to a problem that I’ve come accross several times before but never really had a go at solving. This time, I just had to get it right or we would have had to use </article> <article> <h1>Another good RPM link</h1> <p>2007-07-25T13:58:00.001-04:00</p> Quoted fromhttp://www.idevelopment.info/data/Unix/Linux/LINUX_RPMCommands.shtml RPM Commands by Jeff Hunter, Sr. Database Administrator This document contains an overview of the principal RPM commands for installing, uninstalling, upgrading, querying, listing, and checking RPM packages on your Red Hat Linux system. # rpm -ivh foo-2.0-4.i386.rpm# rpm -i </article> <article> <h1>RPM by example</h1> <p>2007-07-25T13:48:00.001-04:00</p> Quoted and tested fromhttp://dirac.org/linux/rpm.htmlalso see http://www.dirac.org/linux/1. rpm package name convention wine-0.9.2-1rh9winehq.i386.rpm^^^^^ Package name: wine ^^^^^ Version number: 0.9.2 (independent of vendor) ^^^^^^^^^^^^^ Release number: 1rh9winehq (this is </article> <article> <h1>URL encoding rules</h1> <p>2007-07-20T12:14:00.001-04:00</p> java.net Class URLEncoder java.lang.Object | +--java.net.URLEncoder public class URLEncoderextends Object The class contains a utility method for converting a String into a MIME format called "x-www-form-urlencoded" format. To convert a String, each character is examined in turn: The ASCII characters 'a' through 'z', 'A' through 'Z', '0' through '9', and ".", "-", "*", </article> <article> <h1>a good post about JSON/XML debate</h1> <p>2007-07-17T16:11:00.001-04:00</p> http://www.b-list.org/weblog/2006/12/21/i-cant-believe-its-not-xmlquoted from the above link:1.The answer is that JSON works because most people don't really need all that overhead, and because it's often possible to do really interesting things with really simple formats.2.But once you get past the egos and the attachments to this or that language or tool, the XML/s-expressions debate basically </article> <article> <h1>A good idea of using Accessibility API to orchestrate GUI applications</h1> <p>2007-07-17T10:49:00.001-04:00</p> http://www.markgrechanik.com/Coins.htmlSee supporting techniques atMSAA http://msdn2.microsoft.com/en-us/library/ms788733.aspxand SUN ACCESShttp://www.sun.com/access/articles/index.html-- Pop (Pu Liu) </article> <article> <h1>Java series in IBM developer works</h1> <p>2007-05-02T15:13:00.001-04:00</p> http://www-128.ibm.com/developerworks/views/java/libraryview.jsp?search_by=practice:-- Pop (Pu Liu) </article> <article> <h1>inner class and static members</h1> <p>2007-05-02T13:31:00.001-04:00</p> Registered: 9/7/06 Inner class and static members Apr 25, 2007 1:25 AM Hi, I know that a non-static inner class can not have static members. But the following code compiles successfully and I am confused at it.class MyOuter{ MyInner inner = new MyInner(); class MyInner { //private static int[] arr1 = new int[2]; // </article> <article> <h1>all trim of a string in bash</h1> <p>2007-04-21T11:11:00.001-04:00</p> str=" \t \n1234 dd 56 \t\n " trim_str=`expr match "$str" '[ \t\n]*$.*[^ \t\n]$[ \t\n]*$'` echo "'$trim_str'" #’1234 dd 56’ [ \t\n]* for leading white spaces $.*[^ \t\n]$ for substring in between with non-whitespace ending [ \t\n]*$ for trailing white spaces expr match "$string" '$$substring$' Extracts $substring at beginning of $string, where $substring is a regular </article> <article> <h1>Search strings in the file and create new files by replacement</h1> <p>2007-03-19T16:46:00.001-04:00</p> #!/bin/bashARGS=5 # Script requires 3 arguments.E_BADARGS=65 # Wrong number of arguments passed to script.if [ $# -lt "$ARGS" ]# Test number of arguments to script (always a good idea). then echo "Usage: `basename $0` directory old-pattern new-pattern" echo "Find all text files under directory recursively and replace old-pattern with new-pattern, output files are stored in </article> <article> <h1>modify vmware bios in Linux</h1> <p>2007-03-08T12:10:00.000-05:00</p> 1. Read the thread http://www.vmware.com/community/thread.jspa?threadID=28149&tstart=02. use the following script to get bios rom file #! /bin/bashset -e VMWARE_DIR=`sed -n 's/^libdir *= *"$.*$"$/\1/p' < /etc/vmware/config`objcopy $VMWARE_DIR/bin/vmware-vmx -O binary -j .bios440 --set-section-flags .bios440=a /tmp/bios.rom.Z perl -e 'use Compress::Zlib; my $v; read STDIN, $v, 211638; $v = </article> <article> <h1>Vnc Display 0</h1> <p>2007-03-02T16:44:00.000-05:00</p> http://www.realvnc.com/products/free/4.1/x0.html-- Pop (Pu Liu) </article> <article> <h1>Linux force file system check</h1> <p>2007-02-23T02:21:00.000-05:00</p> In Linux, you can not run fsck in the normal runlevel or with the file system in use. You need to do that in single user mode by running "init 1"or use the trick mentioned as following: http://www.karkomaonline.com/article.php/20060411124210124shutdown: The -f flag means 'reboot fast'. This only creates an advisory file /fastboot which can be tested by the system when it comes up again </article> <article> <h1>Linux resources and boot disk</h1> <p>2007-02-15T21:02:00.000-05:00</p> http://www-128.ibm.com/developerworks/linux/ IBM Linux portal http://www.captain.at/howto-linux-boot-cd.php This howto uses isolinux to boot the cd, not like other boot CD's, which use "El Torito". Booting a CD via "El Torito" uses a disk image similar like a floppy image, which will take care of loading and configuring the system and the rest of the CD. Booting a CD with isolinux is </article> <article> <h1>Play with initrd</h1> <p>2007-02-15T13:42:00.000-05:00</p> Resources1. http://www.cpqlinux.com/dig-initrd.html2. http://www.faqs.org/docs/evms/x3834.html Unpacking an initrd#prepare work directorycd ~/temp#Grap initrdcp /media/cdrecorder/initrd.gz .#unzip the filegunzip initrd.gz#you will get a new file named initrd#create a directory as mount point mkdir initrd.dir#before mount it, change to super usersu#mount itmount initrd initrd.dir -o loop#access </article> <article> <h1>Linux: Copy Files</h1> <p>2007-02-15T13:25:00.000-05:00</p> 1. http://www.sun.com/bigadmin/content/submitted/safely_copy_files.html2. http://www.cs.hmc.edu/qref/targzip.html 3. http://www.unixtips.org/4. http://www.linux.com/guides/abs-guide/cp -r or cp -a might not be appropriate in some cases. 1. NFS (might be a partial copy)2. symbolic links (will copy the actual content)3. file group and permission (will lose)An alternative could be using tar (from </article> <article> <h1>enable existing applications for Grid</h1> <p>2007-02-05T13:35:00.000-05:00</p> Quoted fromhttp://www-128.ibm.com/developerworks/grid/library/gr-enable4/Let's summarize the six strategies: Strategy 1Batch AnywhereThe application can run as a single job on any of many computers in a grid. Strategy 2Independent Concurrent BatchMultiple independent instances of the application can be running concurrently.Strategy 3Parallel BatchThe work of a batch program is subdivided so that </article> <article> <h1>add sound card to vmware server virtual machine</h1> <p>2007-01-26T09:26:00.000-05:00</p> If your virtual machine does not have a virtual sound adapter in the virtual machine configuration file (.vmx)With the virtual machine powered off, try adding the following lines to the end of the .vmx file sound.present = "TRUE"sound.virtualDev = "es1371"sound.fileName = "-1"sound.autodetect = "TRUE"Then you can use wmware server virtual machine configuration to point the </article> <article> <h1>UML learning stuff</h1> <p>2007-01-23T11:28:00.000-05:00</p> Java modeling: Summary Document options Document options requiring JavaScript are not displayed Print this page E-mail this page Discuss Rate this page Help us improve this contentLevel: Introductory Granville Miller (rmiller@togethersoft.com), Mentor, TogetherSoft 01 Jun 2002Welcome to Java modeling, a monthly column for Java developers that examines best practices in the UML, a </article> <article> <h1>two articles about C++ assignment operator</h1> <p>2007-01-22T11:38:00.000-05:00</p> http://icu.sourceforge.net/docs/papers/cpp_report/the_anatomy_of_the_assignment_operator.html class TFoo : public TSuperFoo { TBar* fBar1; //TBar is monomorphic (1) TBar* fBar2; // various method definitions go here...}//Do not need to be a virtual function TFoo& const //considering: a=b=c and (a=b)=cTFoo::operator=(const TFoo& that) {//step 1 if (this == &that) //compare address </article> <article> <h1>Using copy construction and assign operator</h1> <p>2007-01-22T09:37:00.000-05:00</p> statement: Using initializer in copy constructor to avoid double initialization for class type members Do not reuse the same for copy constructor and assign operator even they are doing the same thing!In C++, assignment and copy construction are different because the copy constructor initializes uninitialized memory, whereas assignment starts with an existing initialized object.If your class </article> <article> <h1>C++ virtual destructor</h1> <p>2007-01-22T08:20:00.000-05:00</p> 5.3.5.3: "If the static type of the operand is different from its dynamic type, the static type shall be a base class of the operand's dynamic type and the static type shall have a virtual destructor or the behavior is undefined." 1. If C++ had a "sealed" keyword, then the rule would be simpler: If you do a "delete p" where p is a pointer to an unsealed class, then that class needs have a virtual </article> <article> <p>2006-11-13T15:07:00.000-05:00</p> SVG learning by example, using Internet Explorerhttp://www.cattocreations.com/LearnSVG/http://www.wpsenergy.com/JayNick/default.aspA free SVG resource websitehttp://www.openclipart.org/SVG and CSShttp://developer.mozilla.org/en/docs/CSS:Getting_Started:SVG_graphicsWeb 2.0 scripthttp://script.aculo.us/Ajax effect with scripthttp://www.thinkvitamin.com/features/ajax/ </article> <article> <h1>svg tutorial: google "svg, tutorial"</h1> <p>2006-10-19T19:46:00.000-04:00</p> http://www.kevlindev.com/tutorials/basics/animation/js_dom/index.htm SVG animation that works for firefox http://www.kevlindev.com/tutorials/basics/index.htm http://www.carto.net/papers/svg/samples/ http://apike.ca/prog_svg.html http://www.codeproject.com/books/learnsvgchapter07.asp Special HTML codeuse & # xxx ; http://www.utoronto.ca/webdocs/HTMLdocs/NewHTML/ </article> <article> <h1>SVG editor</h1> <p>2006-10-12T19:41:00.000-04:00</p> GLIPSGraffiti http://sourceforge.net/project/showfiles.php?group_id=118213&package_id=128699 C:\GLIPSGraffiti1.4>java -classpath GLIPSGraffiti.jar;Libraries.jar fr.itris.gli ps.svgeditor.SVGEditorMain </article> <article> <h1>Linux find</h1> <p>2006-10-02T14:54:00.000-04:00</p> Posted By Ken Guest 12:07, 30 June 2006 finder-keepers. In it's simplest use the find command searches for files in the current directory and its subdirectories: $ find . ./tp1301.txt ./up1301.txt ./tp1302.txt ./up1302.txt ./Up1303.txt ./misc/uploads ./misc/uploads/patch12_13.diff As always, the dot indicates the current directory. Here find has listed all files found in the current directory </article> <article> <h1>Kill Linux processes with the same parent PID</h1> <p>2006-09-27T18:05:00.000-04:00</p> 1. use pstree to get the tree2. use ps -g <group id>3. use ps -j to list group id4. use ps | awk | xargs kill -9 </article> <article> <h1>Virtual Network Computing(VNC)</h1> <p>2006-09-26T12:39:00.000-04:00</p> Quoted from http://www.frankhilliard.com/remotelinux.cfm by Frank Hilliard How to Run Linux KDE on an Windows Box The answer is with a server-viewer application called Virtual Network Computing from AT&T Laboratories in Cambridge. Get it from http://www.realvnc.com/ Gunzip it and and untar it and it will create a subdirectory of its own called vnc_x86_linux_2.0. Change directory into it </article> <article> <h1>Javascript Debugger</h1> <p>2006-09-22T16:42:00.000-04:00</p> For IE explorer, install MSE (Microsoft Script Editor) that is shipped with office XP and office 2003.See http://ciquat.blogspot.com/2006/01/reliable-javascript-debugging-with.htmlFor Firefox, see http://www.mozilla.org/projects/venkman/ </article> <article> <h1>Some cool stuff about Javascript</h1> <p>2006-09-22T15:01:00.000-04:00</p> 1. tailor the web page as you wishhttp://platypus.mozdev.org/2. view the html source in a better wayhttp://jennifermadden.com/scripts/ViewRenderedSource.html3. thousands of free Javascripts for use.http://www.dynamicdrive.com/ </article> <article> <h1>Java CodeDOM</h1> <p>2006-09-11T17:08:00.000-04:00</p> http://help.eclipse.org/help32/index.jsp?topic=/org.eclipse.jdt.doc.isv/guide/jdt_api_manip.htmFrom scratch It is possible to create a CompilationUnit from scratch using the factory methods on AST. These method names start with new.... The following is an example that creates a HelloWorld class. The first snippet is the generated output: package example; import java.util.*; public class </article> <article> <h1>A good paper about File Permission from Clement Lefebvre</h1> <p>2006-09-07T16:45:00.000-04:00</p> Get from http://www.linuxforums.org/security/file_permissions.html, Contributed by Clement Lefebvre  in Security In GNU/Linux, file access is restricted. Users don't necessarily have the same rights when it comes to deleting, executing or even reading files. In fact, every file contain data such as its owner, its permissions and other information </article> <article> <h1>Semantic Web</h1> <p>2006-09-06T09:46:00.000-04:00</p> from an email talking about AJAX and XLINK, to RDF, to Semantic WebIn wikipedia, search RDF to get the information about Semantic Web </article> <article> <h1>Java Preference resources</h1> <p>2006-08-31T10:45:00.000-04:00</p> An introduction to the APIhttp://www-128.ibm.com/developerworks/java/library/j-prefapi.html?ca=dgr-lnxw16PrefAPI1. init the Preference object2. read value3. write value4. import/export tree5. listening on the changePreference with encryptionhttp://www.ddj.com/dept/windows/184416587 </article> <article> <h1>First servlet and JSP</h1> <p>2006-08-21T17:11:00.000-04:00</p> 1. download and install Eclipse and Tomcat pluginsee http://www-128.ibm.com/developerworks/library/os-ectom/2. create a Tomcat project3. Write the Servlet code4. create web.xml filespecify servlet and servlet-mapping section5. start tomcatfrom the icon6. in the browser type in:http://localhost:8080/firstServlet/helloAlso seehttp://www.xwt.org/tutorial/eclipse/http://jakarta.apache.org/cactus/ </article> <article> <h1>Subversion: replacement for CVS</h1> <p>2006-08-17T11:08:00.000-04:00</p> http://www-128.ibm.com/developerworks/java/library/j-subversion/index.html 1. Similiar to CVS: diff, patch, tag, commit, revert, and branch2. Support non-ASCII test and binary data3. track moves and deletes4. lack of obliterate (Once the content is in the repository, it will never be lost)1. Install Subversion plugin in Eclipsea. In eclipse, Menu Help --> Software Updates --> Find and Install...b </article> <article> <h1>ACE_String performance</h1> <p>2006-07-05T15:18:00.000-04:00</p> From Ajith String allocation/deallocation is a primary cause of heap fragmentation and poor performance. There are three things that we can do to speed up string usage. 1. const SymString fname="my func"; should be .. static const SymChar fname[]=SymText("my func"); SymString will allocate memory for "my func" and copy it every time the function is entered. 2. </article> <article> <h1>On performance: socket programming</h1> <p>2006-07-05T15:16:00.000-04:00</p> http://www-128.ibm.com/developerworks/linux/library/l-hisock.html?ca=dgr-lnxw07BoostSocket Minimize packet transmit latency. Minimize system call overhead. Adjust TCP windows for the Bandwidth Delay Product. Dynamically tune the GNU/Linux TCP/IP stack. </article> <article> <h1>Readings about Grid Computing</h1> <p>2006-06-27T20:55:00.000-04:00</p> Introductory Papers: The Vision of Autonomic Computing, Jeffrey O. Kephart, David M. Chess, IEEE Computer 36(1): 41-50 (2003). Steve R. White, James E. Hanson, Ian Whalley, David M. Chess, and Jeffrey O. Kephart. An architectural approach to autonomic computing. In Proceedings of the International Conference on Autonomic Computing (ICAC'04), pages 2-9. IEEE </article> <article> <h1>Ajax: A new Approach to Web Application</h1> <p>2006-06-25T14:39:00.000-04:00</p> http://www.adaptivepath.com/publications/essays/archives/000385.php Quoted from above web site. Take a look at Google Suggest. Watch the way the suggested terms update as you type, almost instantly. Now look at Google Maps. Zoom in. Use your cursor to grab the map and scroll around a bit. Again, everything happens almost instantly, with no waiting for pages to reload. Google Suggest </article> <article> <h1>WSRF.NET message tracing</h1> <p>2006-06-23T09:08:00.000-04:00</p> In visual studio, open the wse 3.0 property in solution explorer. check the box for message tracing in Diagnotics tab. </article> <article> <h1>using inter-process lock</h1> <p>2006-06-21T12:51:00.000-04:00</p> In Linux A tutorial on how to use flock http://www.ecst.csuchico.edu/~beej/guide/ipc/flock.html Linux command: ipcs and ipcrm ACE In ACE ACE_OS::flock_xxx is a wrapper facility on top of flock which is fully supported in Linux 2.4. In windows 2003 server, it is not working well. Instead, we can use ACE_Process_Mutex Note: Essentially, the initialization of a lock is </article> <article> <h1>generic wrapper for logger</h1> <p>2006-06-14T14:23:00.000-04:00</p> Ggeneralized the service wrapper script that does stdout+err redirection to a file It's literally 3-4 dead simple lines of code ServiceWrapper (must be made executable with something like chmod a+x ServiceWrapper) #!/bin/bash -f # -f: do not source .bashrc (for speed) # Alain Andrieux, Platform # Wrapper script for stdout/err redirection, service troubleshooting, etc... # To use </article> <article> <h1>how to add citation reference in word</h1> <p>2006-06-12T08:12:00.000-04:00</p> An extremely useful skill but can not find it anywhere. Here is my finding. 1. Create a list of referenced papers, and using “[ index ] “ Select them, click [Format] à [bullet and numbering…] à [customize] à [number format] to add [ ] 2. In the document, insert a citation Click [Insert] à [ reference ] à [ cross –reference ], in “Reference Type” choose Numbered item, then </article> <article> <h1>rethink "rethink the Java SOAP stack"</h1> <p>2006-06-11T19:24:00.000-04:00</p> The main thread: JAX-web service under attack http://www.theserverside.com/news/thread.tss?thread_id=34298#172874 The response for the paper Rethink the Java SOAP stack http://www.hpl.hp.com/techreports/2005/HPL-2005-83.pdf http://weblogs.java.net/blog/arungupta/archive/2005/06/why_rethink_the.html Introduce JAX-WS 2.0 Further reading http://radio.javaranch.com/val/2005/06/ </article> <article> <h1>JAX-RPC, client</h1> <p>2006-06-11T18:54:00.000-04:00</p> This section shows how to create and run these types of clients: Static stub Dynamic proxy Dynamic invocation interface (DII) When you run these client examples, they will access the MyHelloService that you deployed in the preceding section. http://java.sun.com/j2ee/1.3/docs/tutorial/doc/JAXRPC4.html Web Service with Apache Axis http://www.pankaj-k.net/axis4tag/ </article> <article> <h1>Language conversion</h1> <p>2006-06-05T09:22:00.000-04:00</p> Java to C# http://www.developer.com/java/other/article.php/2235411 The Java Language Conversion Assistant (JLCA) is a tool that provides the ability to convert Java code and library calls to Microsoft Visual C# .NET. Built based on the ArtinSoft migration technology, this second version adds a number of additional features to its abilities. This includes the ability to convert code from both </article> <article> <h1>gt4 wsrf soap message</h1> <p>2006-05-31T11:07:00.000-04:00</p> ---Request CreateResource <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/03/addressing"> <soapenv:Header> <wsa:MessageID soapenv:mustUnderstand="0">uuid:083d9e90-f0af-11da- </article> <article> <h1>Java: using system property</h1> <p>2006-05-30T22:05:00.000-04:00</p> 1. use java –D option to define system property  <target name="runX" depends="xClient"> <java classname="xclient.Client" fork="true"> <jvmarg value="-DcontainerHome=${project-home}"/> <classpath refid="classpath"/> <classpath> <pathelement location="${project-home}/classes"/> </classpath> </article> <article> <h1>JAX-RPC: soap header</h1> <p>2006-05-30T22:00:00.000-04:00</p> Tried to add SOAP header into the SOAP message in JAX-RPC, A lot of links showed how to achieve that, but they do not work. http://www-128.ibm.com/developerworks/webservices/library/ws-tipjax1.html http://users.skynet.be/pascalbotte/rcx-ws-doc/jaxrpchandler.htm http://java.boot.by/wsd-guide/ch04s07.html Finally, found this link (quite old though) http://www.myfaq.com.cn/A/2003-10-08/ </article> <article> <h1>java jni tutorial</h1> <p>2006-05-24T19:18:00.000-04:00</p> A good one, simple and works well.http://public.cabit.wpcarey.asu.edu/janjua/java/jni/Two methods to load DLL1. System.loadLibrary(String)2. System.load(String)http://www.inonit.com/cygwin/jni/helloWorld/load.html </article> <article> <h1>WSRF.net Howto</h1> <p>2006-05-21T09:26:00.000-04:00</p> 1. install WSRFdotNet2. rebuild the solution by VS20053. go to ${WSRFdotNet}Scripts\SqlExpress, run "setup.bat" to setup database4. run NUnit to test the newly installationtrouble shoot1. can not see WSRF PAT tool bar rebuild add-in trick: have to exit from VS2005 and then manually copied the files from C:\WSRFdotNet\Src\Tools\WSRFServiceAddin\bin\Debug to C:\WSRFdotNet\Bin2. WSRF PAT is not </article> <article> <h1>some thoughts about dynamic deployment</h1> <p>2006-05-16T22:28:00.000-04:00</p> I am improving my implementation for dynamic deployment via X# code. Previously, for each incoming X# code, the container will create a separate module (in .JAR or .DLL) by translating X# to Java/C# at first, then invoking the Java compiler or C# compiler. When the user calls the deployed services, which in turn will trigger the newly generated modules, we will face the same situation like </article> <article> <h1>.NET container issues</h1> <p>2006-05-15T16:58:00.000-04:00</p> 1. Sandboxing code dynamicallyQuoted from http://www.dotnetthis.com/Articles/DynamicSandboxing.htmI have been getting questions from people about how to make a piece of managed code execute in a security restricted environment, or how to "sandbox" it. Some people are trying to use stack walk modifiers (such as Deny()) to do it, which does not work for this purpose. Other people are trying </article> <article> <h1>FSM and state pattern</h1> <p>2006-05-15T12:33:00.000-04:00</p> UML Tutorial: Finite State Machineshttp://www.objectmentor.com/resources/articles/umlfsm.pdfState Pattern in C++ Applicationshttp://www.codeproject.com/cpp/statepattern3.asp?df=100&forumid=2614&exp=0&select=1450830 </article> <article> <h1>C++ WS container and WSRF</h1> <p>2006-05-15T11:01:00.000-04:00</p> Deploying C++ Grid Services: Options and Performancehttp://www.cs.duke.edu/~anda/cps296.5/final_projects/PaperWS.pdfWriting Web Services in C/C++ using Globus Toolkit V 4.0 (GT4)http://www.jwork.net/GT4WSC/State and Events for Web Services: A Comparison of Five WSGlobus C core1. WSRFhttp://www.globus.org/toolkit/docs/4.0/common/cwscore/C-GT4-WSRF-Design.pdf2. C container http://www.globus.org/ </article> <article> <h1>c++ wrapper for C array</h1> <p>2006-05-10T15:04:00.000-04:00</p> http://www.informit.com/guides/content.asp?g=cplusplus&seqNum=207&rl=1 template <class T, int _size> struct array_wrapper{ //typedef names used in STL algorithms and containers typedef T value_type; typedef T* iterator; typedef const T * const_iterator; typedef T& reference; typedef const T& const_reference; T v[_size]; //the actual array// member functions of STL containersoperator T* ( </article> <article> <h1>gsoap: from wsdl to .h</h1> <p>2006-05-10T09:39:00.000-04:00</p> echo gsoap client stub cd stub rm * rem use the typemap.dat rem xsd__anyType = | xsd__anyType rem mcws = "http://www.cs.binghamton.edu/mcws" cp ..\typemap.dat . rem use dom++ for xsd__anyType cp ..\dom++.h . wsdl2h -s -c -o gsoap_mcws.h ..\..\wsdl\mcws.wsdl echo #import "dom++.h" > temp.h cat gsoap_mcws.h >> temp.h rem remove the gsoapopt line sh -c "sed 's_\/\/gsoapopt cw__' </article> <article> <h1>java code to list jar files in a directory</h1> <p>2006-05-08T21:28:00.000-04:00</p> private URL[] listJar(String dir) { URL[] urls = null; String suffix=".jar"; int total=0; try{ File f = new File(dir); if (!f.exists() || !f.isDirectory()) { System.out.println ( dir+" does NOT exist" ); return null; } String path = f.getPath(); String[] files = f.list(); </article> <article> <h1>Interoperability for Document-Based Web Services (ASP.NET)</h1> <p>2006-05-06T13:31:00.000-04:00</p> How to manipulate xsd:anyType in asp.net web service, JWSDP, and gSOAP This is the first part about ASP.NET Two good papers are at http://java.sun.com/developer/technicalArticles/xml/jaxrpcpatterns/index.html http://java.sun.com/developer/technicalArticles/xml/jaxrpcpatterns2/ Overall, there are five approaches to use document-based web services. * Using XML in the SOAP </article> <article> <h1>trouble shooting for firewall and gsoap</h1> <p>2006-05-01T11:35:00.000-04:00</p> 1. change the soap bind to m = soap_bind(&soap, 0 , m_port, BACKLOG); DO NOT use m = soap_bind(&soap, “localhost” , m_port, BACKLOG); 2. in windows, [start] >>> [control panel] >>> [windows Firewall] >>> [Exceptions] >>> [Add Port…] Give a name and the port for mcws gsoap service. </article> <article> <h1>Java dynamic class loading issue</h1> <p>2006-04-25T10:52:00.000-04:00</p> Resource: The thread to discuss how to add (only) jar files into JVM just like it is added in classpath during start up. http://forum.java.sun.com/thread.jspa?threadID=300557&start=0&tstart=0 This link talks about how to dynamically plug in/out jar files (the best way) http://java.sun.com/products/jndi/tutorial/beyond/misc/index.html A more detailed white paper is available at </article> <article> <h1>gt4 and jwsdp-1.5 jar difference list</h1> <p>2006-04-24T13:32:00.000-04:00</p> In GT4 grid service implementation, in order to use client stub generated by jwsdp1.5, we have to copy the following jar files from jwsdp1.5 to gt4. Details: ${jwsdp1.5}/jaxrpc/lib/jaxrpc-api.jar ${jwsdp1.5}/jaxrpc/lib/jaxrpc-impl.jar ${jwsdp1.5}/jaxrpc/lib/jaxrpc-spi.jar ${jwsdp1.5}/jwsdp-shared/lib/activation.jar ${jwsdp1.5}/jwsdp-shared/lib/mail.jar ${jwsdp1.5}/saaj/lib/ </article> <article> <h1>WSRF.NET trouble list</h1> <p>2006-04-23T13:01:00.000-04:00</p> The root cause why in WSRF.NET we can not use object, and object[] is due to the wrong type and element name generated by WSRF.NET In generated MCWSRFPortType.wsdl Change tns:Object to xsd:anyType Change name=”Object” to name=”anyType” ----------Original ----------------- <xsd:complexType name="Object" /> <xsd:complexType name="ArrayOfObject"> <xsd: </article> <article> <h1>Play with java SOAPElement in JAX-RPC xsd:anyType</h1> <p>2006-04-22T21:20:00.000-04:00</p> In JAX_RPC, xsd:anyType is mapped to javax.xml.soap.SOAPElement Here is the java function to convert an int to SOAPElement public static SOAPElement int2SOAPElement(String tagName, int value) { try{ SOAPFactory sf = SOAPFactory.newInstance(); SOAPElement e = sf.createElement(tagName); String xsi = "http://www.w3.org/2001/ </article> <article> <h1>How to use Java SOAPElement</h1> <p>2006-04-21T15:54:00.000-04:00</p> 1. javax.xml.soap à saaj.jar Interface SOAPElement http://java.sun.com/j2ee/1.4/docs/api/javax/xml/soap/SOAPElement.html This package is defined in the SOAP with Attachments API for JavaTM (SAAJ) 1.1 specification. SOAPElement could be used as Element Because public interface SOAPElement extends Node, Element 2. Using xsd:anyType to Represent XML Documents in a Service </article> <article> <h1>Java web service portal</h1> <p>2006-04-21T14:15:00.000-04:00</p> 1. Patterns and Strategies for Building Document-Based Web Services http://java.sun.com/developer/technicalArticles/xml/jaxrpcpatterns/index.html 2. Writing A JAX-RPC Client from WSDL (quite old though, but the build.xml is useful) http://www.descriptor.com/articles/web-services/wsdlclient.html Here is my tutorial 1. get the wsdl file in place ../wsdl/mcws.wsdl </article> <article> <h1>interoperability between GSOAP and .NET</h1> <p>2006-04-19T09:30:00.000-04:00</p> The key point is about namespace. 1. How to use gsoap DOM parser to generate xsd:anyType node extern "C" ACE_Svc_Export soap_dom_element factory() { xsd__int ret = main_entry(); struct soap soap; soap_init(&soap); soap_set_imode(&soap, SOAP_DOM_NODE); xsd__int domval=ret ; //we have to use this type soap_dom_element retDomVal(&soap, "mcws", NULL, &domval, </article> <article> <p>2006-04-17T16:10:00.000-04:00</p> How to program in GT4.A tutorial linkhttp://www.codeguru.com/cpp/data/mfc_database/misc/article.php/c9695__2/1. get service implementation interface frombuild/stubs-xxx/src/org/globus/examples/stubs/MathService_instance/xxxPortType.java2. find stub definition underbuild/stubs-xxx/src/org/globus/examples/stubs/MathService_instance/xxx.java </article> <article> <h1>Tools in HSBC</h1> <p>2006-04-12T09:47:00.000-04:00</p> 1. SysInternals: http://www.sysinternals.com Excellent source of tools for network, disk, process monitoring and executions. * Particularly look for PsTools and Process Explorer. 2. Network related Ethereal - Good for network packet dumping or point to point monitoring. Uses the WinPCap drivers. http://www.ethereal.com/ MRTG - Used by HSBC - CCF http://people.ee.ethz.ch/~ </article> <article> <h1>MCWS porting to WSRF.NET done</h1> <p>2006-04-06T23:56:00.000-04:00</p> Unzip ServiceMCWSRF.zip to C:\Inetpub\wwwroot Unzip MCWSRF.zip to C:\Documents and Settings\pliu\My Documents\Visual Studio 2005\Projects 1. The path is hard-coded. 2. In order to use web reflection (using System.Object as return type), Remember to modify MCWSRFPortType.wsdl <change tns:Object to xsd:anyType> before updating client side web reference 3. Add reference of MathService </article> <article> <h1>Linux Longjmp</h1> <p>2006-04-06T13:50:00.000-04:00</p> -----------Code------ #include <stdio.h> #include <stdlib.h> #include <setjmp.h> jmp_buf env; int i; int max; int main () { int j; max = 5050; i = 0; //longjmp here!!! j = setjmp(env); printf("j:= %d\n",j); if(i < max) { printf("i:= %d\n", i); i = i+j; longjmp(env, j+1); //jump to setjmp(env) and return j+1 printf("Never reached </article> <article> <h1>WSRF.NET and System.Object</h1> <p>2006-04-06T12:52:00.000-04:00</p> There is an issue on how to use System.Object as parameter or return value in web method.The solution is extremely simple. But it takes me almost two days to figure that out. :-))Step 1.The you can define your web method like [WebMethod] public System.Object HelloWorld() { string s = "Hello World"; return (object)s; } Step 2.set it to WSRF and WSE3.0Step 3.invoke </article> <article> <h1>How to debug ASP.NET web application/services</h1> <p>2006-04-06T10:24:00.000-04:00</p> http://msdn2.microsoft.com/en-US/library/e8z01xdh(VS.80).aspx To enable debugging in the project properties In Visual Studio 2005, use the <Project> Property Pages to set project properties for Web application debugging by doing the following: <![if !supportLists]>1. <![endif]>Open the Property Pages by right-clicking the project name in Solution Explorer, and selecting Property </article> <article> <h1>VS 2005, Add-in trouble shoot</h1> <p>2006-04-04T09:16:00.000-04:00</p> Usually, the add-in configuration file is read from C:\Documents and Settings\All Users\Application Data\Microsoft\MSEnvShared\Addins The configuration is a text file, so you can open it and edit it. Make sure the DLL it points to is valid. I use this method and fix the problem when WSDF add-in does not show up in the VS 2005.In WSRF.NET, usually, we need to re-build the binaries </article> <article> <h1>GT4 tutorial</h1> <p>2006-03-31T16:00:00.000-05:00</p> 1. Go to tutorial http://gdp.globus.org/gt4-tutorial/ 2. Download tutorial source code from http://gdp.globus.org/gt4-tutorial/download/progtutorial-examples_0.2.1.tar.gz 3. Unzip the source code package to /home/pliu/gt4_tutorial Note: use bash afterwards 4. Make service GAR file: cd /home/pliu/gt4_tutorial./globus-build-service.sh \-d org/globus/examples/services/core/first/ \-s </article> <article> <h1>gt4, programer guide portal</h1> <p>2006-03-31T14:17:00.000-05:00</p> http://gdp.globus.org/gt4-tutorial/ </article> <article> <h1>An approach other than C-- for MCWS</h1> <p>2006-03-31T11:45:00.000-05:00</p> Given the XML schema, Java/C#/C++ provides a schema compiler to generate the correspondent language binding. That is, for a schema instance XML snippet, the schema compiler can generate the code to un-marshal XML into object for the specific language. This is also true for X#. For example, in X# schema, we define a method call as <xs:complexType name="XSharpMethodInvokeStatement"> </article> </main></body></html>