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• which is the best or widely used MVVM pattern for WPF?

  - by Kishore Kumar

  Could you tell me which is the best MVVM pattern someone have to follow. where can i found hands on exmaple. Actually i was little confused which one to follow? Thnx

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• What is the correct pattern for using a global mutex in WPF?

  - by Joel Barsotti

  So I've found this information http://stackoverflow.com/questions/229565/what-is-a-good-pattern-for-using-a-global-mutex-in-c/229567 But it's based on the main entry point of a standard app. How do you modify this to work for the WPF event model of starting the app?

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• Chain of Responsibility Pattern: is it a good practice to have interdependent handlers?

  - by wei

  I have this scenario: I have a chain of query handlers, the first is to query the cache, if the cache can't answer it or the answer is stale, then hit a database, if it can't find the answer or the answer is stale again, then query a remote web service. But I am not sure if this is the right way to use this pattern, since the work flow is pretty much fixed, and the cache and database handlers depend on the next step's return result to refresh its records.

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• What is the most used pattern in java.io?

  - by jb

  I was asked this question recently during my job interview, and I couldn't answer it. So, what is the most used pattern in java.io and how is it used? What are other patterns used in common java libraries?

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• How do I sort a directory by time, and display the last four image files matching a pattern with php

  - by purpletonic

  I have a directory that will be getting updated frequently, I want to display the last four images files uploaded, which match a certain pattern, on my php page. Is this possible without having to perform a sort on every single image within the directory? Many thanks!

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• Silverlight and MV(VM) Pattern - No Code-Behind - Is this possible?

  - by user118190

  I am working on Silverlight 3.0 and currently using code-behind in my Views. I would like to implement the MV(VM) pattern into my project as the project is growing. I have seen some WPF projects where the code-behind has NO CODE except for the InitializeComponent method, which I believe is the right way to go and just looks clean. Is this possible in Silverlight 3.0, that is, no code-behind? Can anyone point me to some good Silverlight (3.0) MV(VM) tutorials / articles?

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• How to search a file for a pattern and get a new file from the match point to end of file?

  - by WilliamKF

  I need to take a file and find the first occurrence of a literal string pattern as a complete line of the file: Acknowledgments: And then I wish to create a new file from the line of match all the way to the end of the file. I expect perl is a good way to do this, but I'm not much of a perl person, alternatively maybe sed is a good way? Please suggest a simple way to reliably accomplish this in Unix.

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• What is the accepted pattern for naming methods that return Tasks?

  - by Karg

  APM uses BeginXXX/EndXX pairs and the Event-based Asynchronous Pattern (EAP) uses XXXAsync and XXXCompleted pairs, but I haven't seen anything standard on how to name methods that return a task. I have been using XXXTask: Data GetData() Task<Data> GetDataTask() but was wondering if a more standard approach has developed

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• Best resources to start learning ASP.NET MVC pattern?

  - by Ayyappan.Anbalagan

  Last week I asked a question about the best technology in ASP.NET. Many people responsed MVC. Thanks to all. What resources can you recommend to start learning ASP.NET MVC - both the MVC pattern and Microsoft's ASP.NET MVC implementation and framework? videos tutorials how to sample code

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• What is the efficient way to find some pattern in a big text?

  - by salman

  I want to extract email addresses from a large text file. what is the best way to do it? My idea is to find '@' in the text and use "Regex" to find email address into substring at (for example) 256 chars before this position and length of 512. P.S.: Straightforwardly I want to know the best and most efficient way to find some pattern (like email addresses) in a huge text.

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• How do you implement the Decorator pattern if you can't inherit from the class you want to decorate?

  - by Lennie

  Hi, This is more a design question... You can't do a decorate design pattern if: 1) The object is marked "sealed" meaning you can't extend from it. 2) or you want to override a method but its not virtual. What can you do then? Taken that you can't change the class source code if you don't have the source code (like a 3rd party library).

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• Better way to write this method with this pattern?

  - by Slorthe

  I have written a lot of methods and I want to time how long it takes for them to run. public void myMethod(){ startTiming(); doLotsOfStuff(); stopTiming(); } I am not only timing, I am also doing some other stuff before AND after the doLotsOfStuff() method. I was wondering if there is a better/smarter way to do this in C# to achieve lesser amount of lines/coding needed for this particular pattern.

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• find substring and indices in mips

  - by ccc

  im trying find out substring and first occurrence indices. but something wrong. im comparing each element of pattern array and each element of string array until pointer reach to '\0'. and if any characater found it keep in temp array. and increasing pointers +1. whats the problem. algorithm is totaly wrong ? #Note: $v0 is a symbolic name used by the assember for $2. # $a0 is a symbolic name used by the assember for $4. .data prompt_str: .asciiz "Please type a text string: " prompt_ptr: .asciiz "Please type a pattern string: " print_yes: .asciiz "Yes, there is a match." print_no: .asciiz "No, there is no match." text_str: .asciiz "Text string : " pattern_str: .asciiz "Pattern string : " print_out: .asciiz "Output to be produced :" print_dash: .asciiz "----------------------" print_index: .asciiz "Starting index :" print_msg : .asciiz "Length of longest partial match = " nl: .asciiz "\n" str : .space 81 ptr : .space 81 tmp : .space 81 .text main: la $a0, prompt_str li $v0, 4 #print_string command. syscall la $a0,str #read string li $a1,81 li $v0,8 syscall la $t0,str #move string to $t0 la $a0,prompt_ptr li $v0,4 #print pattern command syscall la $a0,ptr #read pattern li $a1,81 li $v0,8 syscall la $t1,ptr #move pattern to $t1 la $t5,tmp #move temp to $t5 lb $t2,0($t0) #pointer first element array of string lb $t3,0($t1) #pointer first element array of pattern lb $t6,0($t5) #pointer first element array of temp loop : beq $t3,$0,end_loop beq $t2,$t3,match addiu $t0,$t0,1 j loop match : move $t6,$t2 addiu $t5,$t5,1 addiu $t0,$t0,1 addiu $t1,$t1,1 j print_match print_match : la $a0,text_str #print string li $v0,4 syscall move $a0,$t0 li $v0,4 syscall la $a0,nl #print newline character li $v0,4 syscall la $a0,pattern_str #print pattern string li $v0,4 syscall move $a0,$t1 li $v0,4 syscall la $a0,nl #print newline character li $v0,4 syscall la $a0,print_out #print output line and newline character li $v0,4 syscall la $a0,nl li $v0,4 syscall la $a0,print_dash li $v0,4 syscall la $a0,print_yes li $v0,4 syscall la $a0,print_index #print starting index li $v0,4 syscall li $v0,10 syscall end_loop : li $v0,10 syscall

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• grep --exclude/--include syntax (do not grep through certain files)

  - by Piskvor

  I'm looking for the string "foo=" (without quotes) in text files in a directory tree. It's on a common Linux machine, I have bash shell: grep -ircl "foo=" * In the directories are also many binary files which match "foo=". As these results are not relevant and slow down the search, I want grep to skip searching these files (mostly JPEG and PNG images): how would I do that? I know there are the --exclude=PATTERN and --include=PATTERN options, but what is the pattern format? manpage of grep says: --include=PATTERN Recurse in directories only searching file matching PATTERN. --exclude=PATTERN Recurse in directories skip file matching PATTERN. Searching on grep include, grep include exclude, grep exclude and variants did not find anything relevant If there's a better way of grepping only in certain files, I'm all for it; moving the offending files is not an option, I can't search only certain directories (the directory structure is a big mess, with everything everywhere). Also, I can't install anything, so I have to do with common tools (like grep or the suggested find). UPDATES: @Adam Rosenfield's answer is just what I was looking for: grep -ircl --exclude=*.{png,jpg} "foo=" * @rmeador's answer is also a good solution: grep -Ir --exclude="*\.svn*" "pattern" * It searches recursively, ignores binary files, and doesn't look inside Subversion hidden folders.(...)

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• Use RegEx in Java to extract parameters in between parentheses

  - by lars_bx

  I'm writing a utility to extract the names of header files from JSPs. I have no problem reading the JSPs line by line and finding the lines I need. I am having a problem extracting the specific text needed using regex. After looking at many similar questions I'm hitting a brick wall. An example of the String I'll be matching from within is: <jsp:include page="<%=Pages.getString(\"MY_HEADER\")%>" flush="true"></jsp:include> All I need is MY_HEADER for this example. Any time I have this tag: <%=Pages.getString I need what comes between this: <%=Pages.getString(\" and this: )%> Here is what I have currently (which is not working, I might add) : String currentLine; while ((currentLine = fileReader.readLine()) != null) { Pattern pattern = Pattern.compile("<%=Pages\\.getString\\(\\\\\"([^\\\\]*)"); Matcher matcher = pattern.matcher(currentLine); while(matcher.find()) { System.out.println(matcher.group(1).toString()); }} I need to be able to use the Java RegEx API and regex to extract those header names. Any help on this issue is greatly appreciated. Thanks! EDIT: Resolved this issue, thankfully. The tricky part was, after being given the right regex, it had to be taken into account that the String I was feeding to the regex was always going to have two " / " characters ( (/"MY_HEADER"/) ) that needed to be escaped in the pattern. Here is what worked (thanks to the help ;-)): Pattern pattern = Pattern.compile("<%=Pages\\.getString\\(\\\\\"([^\\\\\"]*)");

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• Exclude css & image resources in web.xml Security Constraint

  - by Tiggles

  I am using JSF2.1 and Glassfish 3.1.2. I specify a security constraint to block everything: <security-constraint> <web-resource-collection> <web-resource-name>Secured Content</web-resource-name> <!-- Block all --> <url-pattern>/*</url-pattern> </web-resource-collection> <!-- only users with at least one of these roles are allowed to access the secured content --> <auth-constraint> <role-name>ADMINISTRATOR</role-name> </auth-constraint> </security-constraint> and have another to allow access a subset of pages and the resources: <security-constraint> <web-resource-collection> <web-resource-name>Open Content</web-resource-name> <!-- Allow subscribe --> <url-pattern>/subscribe/*</url-pattern> <url-pattern>/javax.faces.resource/*</url-pattern> </web-resource-collection> <!-- No Auth Contraint! --> </security-constraint> This works fine. However, is the following <url-pattern>/javax.faces.resource/*</url-pattern> the correct way to allow all resources? I only did this by looking at the url that Facelets injects into the xhtml. Is there security holes with this approach? Thanks.

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• Using java.util.regex in Android apps - are there issues with this?

  - by johnrock

  In an Android app I have a utility class that I use to parse strings for 2 regEx's. I compile the 2 patterns in a static initializer so they only get compiled once, then activities can use the parsing methods statically. This works fine except that the first time the class is accessed and loaded, and the static initializer compiles the pattern, the UI hangs for close to a MINUTE while it compiles the pattern! After the first time, it flies on all subsequent calls to parseString(). My regEx that I am using is rather large - 847 characters, but in a normal java webapp this is lightning fast. I am testing this so far only in the emulator with a 1.5 AVD. Could this just be an emulator issue or is there some other reason that this pattern is taking so long to compile? private static final String exp1 = "(insertratherlong---847character--regexhere)"; private static Pattern regex1 = null; private static final String newLineAndTagsExp = "[<>\\s]"; private static Pattern regexNewLineAndTags = null; static { regex1 = Pattern.compile(exp1, Pattern.CASE_INSENSITIVE); regexNewLineAndTags = Pattern.compile(newLineAndTagsExp); } public static String parseString(CharSequence inputStr) { String replacementStr = "replaceMentText"; String resultString = "none"; try { Matcher regexMatcher = regex1.matcher(inputStr); try { resultString = regexMatcher.replaceAll(replacementStr); } catch (IllegalArgumentException ex) { } catch (IndexOutOfBoundsException ex) { } } catch (PatternSyntaxException ex) { } return resultString; }

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• web.xml : URL mapping

  - by Devashish Dixit

  I have these two lines in my web.xml <url-pattern>/</url-pattern> : Index Servletand <url-pattern>/login</url-pattern> : Login Servlet but whem I open http://localhost:8084/login/, it goes to Index Servlet and when I open http://localhost:8084/login, it goes to Login Servlet. Is there any difference in http://localhost:8084/login/ and http://localhost:8084/login? My web.xml <servlet> <servlet-name>Index</servlet-name> <servlet-class>Index</servlet-class> </servlet> <servlet> <servlet-name>Login</servlet-name> <servlet-class>Login</servlet-class> </servlet> and <servlet-mapping> <servlet-name>Index</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Login</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping>

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• Single click handler for all buttons in Javascript? Is it a pattern? Whats the benefit?

  - by Hasan Khan

  I have been told that when there are multiple buttons on the page for same purpose but targeting different item e.g. delete item on a grid of items, they say it is recommended to just register for click handler only on the top most element like 'body' and check what was clicked instead of hooking up click with every delete button. Whats the benefit of this? Creating more handlers causes problems? Is it an optimization of some sort? Is it a pattern? Does it have anything to do with performance? Where can I read more about it?

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• Why does this mod_rewrite rule 'not-match'? (big rewrite log included)

  - by Christopher

  I've got a scenario involving two domains: WordPress site hosted on domain1.com domain2.co.uk, simply redirecting users to domain1 via mod_rewrite This rule applies irrespective of whether www. is specified or not. (It's eventually removed from the URL, I'm a no-WWW fan.) There's nothing on domain2.co.uk at all except for an .htaccess with some mod_rewrite rules. However, I want to be able to allow users to be redirected to the correct article URI even if they specify the "wrong" URL (i.e., a 301 redirect preserving the stuff after the first forward slash). I'm currently achieving this with this ruleset: RewriteCond %{HTTP_HOST} ^((www\.)?[^\.]+)\.domain2\.co\.uk [NC,OR] RewriteCond %{HTTP_HOST} ^domain2\.co\.uk [NC] RewriteRule ^(.*)$ http://domain1.com/$1 [R=301,L] This works but is uglier than I want it to be. I'm not a mod_rewrite zen master, but from what I can tell the top rule should match irrespective of whether www. is specified... But it doesn't. In order to catch www-less requests, I need the second RewriteCond. From the rewrite log, with just the first RewriteCond: [domain2.co.uk/sid#e200498][rid#e670168/initial] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] strip per-dir prefix: /home/devnull/domains/domain2.co.uk/public_html/ -> [domain2.co.uk/sid#e200498][rid#e670168/initial] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] applying pattern '^(.*)$' to uri '' [domain2.co.uk/sid#e200498][rid#e670168/initial] (4) [perdir /home/devnull/domains/domain2.co.uk/public_html/] RewriteCond: input='domain2.co.uk' pattern='^((www\.)|[^\.]+)\.domain2\.co\.uk' [NC] => not-matched [domain2.co.uk/sid#e200498][rid#e670168/initial] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/ [domain2.co.uk/sid#e200498][rid#e653868/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.html [domain2.co.uk/sid#e200498][rid#e65f8b8/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.htm [domain2.co.uk/sid#e200498][rid#e653868/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.shtml [domain2.co.uk/sid#e200498][rid#e65f8b8/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.php [domain2.co.uk/sid#e200498][rid#e653868/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.php5 [domain2.co.uk/sid#e200498][rid#e666c98/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.php4 [domain2.co.uk/sid#e200498][rid#e65f8b8/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.php3 [domain2.co.uk/sid#e200498][rid#e653868/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.phtml [domain2.co.uk/sid#e200498][rid#e65f8b8/subreq] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/index.cgi [domain2.co.uk/sid#e200498][rid#e66c370/initial/redir#1] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] strip per-dir prefix: /home/devnull/domains/domain2.co.uk/public_html/403.shtml -> 403.shtml [domain2.co.uk/sid#e200498][rid#e66c370/initial/redir#1] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] applying pattern '^(.*)$' to uri '403.shtml' [domain2.co.uk/sid#e200498][rid#e66c370/initial/redir#1] (4) [perdir /home/devnull/domains/domain2.co.uk/public_html/] RewriteCond: input='domain2.co.uk' pattern='^((www\.)|[^\.]+)\.domain2\.co\.uk' [NC] => not-matched [domain2.co.uk/sid#e200498][rid#e66c370/initial/redir#1] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/403.shtml [domain2.co.uk/sid#e200498][rid#e668ca8/initial] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] strip per-dir prefix: /home/devnull/domains/domain2.co.uk/public_html/favicon.ico -> favicon.ico [domain2.co.uk/sid#e200498][rid#e668ca8/initial] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] applying pattern '^(.*)$' to uri 'favicon.ico' [domain2.co.uk/sid#e200498][rid#e668ca8/initial] (4) [perdir /home/devnull/domains/domain2.co.uk/public_html/] RewriteCond: input='domain2.co.uk' pattern='^((www\.)|[^\.]+)\.domain2\.co\.uk' [NC] => not-matched [domain2.co.uk/sid#e200498][rid#e668ca8/initial] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/favicon.ico [domain2.co.uk/sid#e200498][rid#f160b40/initial/redir#1] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] strip per-dir prefix: /home/devnull/domains/domain2.co.uk/public_html/404.shtml -> 404.shtml [domain2.co.uk/sid#e200498][rid#f160b40/initial/redir#1] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] applying pattern '^(.*)$' to uri '404.shtml' [domain2.co.uk/sid#e200498][rid#f160b40/initial/redir#1] (4) [perdir /home/devnull/domains/domain2.co.uk/public_html/] RewriteCond: input='domain2.co.uk' pattern='^((www\.)|[^\.]+)\.domain2\.co\.uk' [NC] => not-matched [domain2.co.uk/sid#e200498][rid#f160b40/initial/redir#1] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] pass through /home/devnull/domains/domain2.co.uk/public_html/404.shtml However with the second RewriteCond added, the rule works, and the logs show this: [domain2.co.uk/sid#e200498][rid#e65fe58/initial] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] strip per-dir prefix: /home/devnull/domains/domain2.co.uk/public_html/ -> [domain2.co.uk/sid#e200498][rid#e65fe58/initial] (3) [perdir /home/devnull/domains/domain2.co.uk/public_html/] applying pattern '^(.*)$' to uri '' [domain2.co.uk/sid#e200498][rid#e65fe58/initial] (4) [perdir /home/devnull/domains/domain2.co.uk/public_html/] RewriteCond: input='domain2.co.uk' pattern='^((www\.)?[^\.]+)\.domain2\.co\.uk' [NC] => not-matched [domain2.co.uk/sid#e200498][rid#e65fe58/initial] (4) [perdir /home/devnull/domains/domain2.co.uk/public_html/] RewriteCond: input='domain2.co.uk' pattern='^domain2\.co\.uk' [NC] => matched [domain2.co.uk/sid#e200498][rid#e65fe58/initial] (2) [perdir /home/devnull/domains/domain2.co.uk/public_html/] rewrite '' -> 'http://domain1.com/' [domain2.co.uk/sid#e200498][rid#e65fe58/initial] (2) [perdir /home/devnull/domains/domain2.co.uk/public_html/] explicitly forcing redirect with http://domain1.com/ [domain2.co.uk/sid#e200498][rid#e65fe58/initial] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] escaping http://domain1.com/ for redirect [domain2.co.uk/sid#e200498][rid#e65fe58/initial] (1) [perdir /home/devnull/domains/domain2.co.uk/public_html/] redirect to http://domain1.com/ [REDIRECT/301] Can anybody help me figure out why it just won't work with the one rule? I feel like I'm missing the bleeding obvious, and while the second RewriteCond is a valid workaround, it's a kludge and that annoys me. ;-) All help appreciated...

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• Error attempting to log into Redmine through IIS 7.5 Reverse Proxy

  - by dneaster3

  I am trying to set up Redmine as a subdirectory of our department's intranet site, and also to rebrand it as "Workflow" using IIS's URL Rewrite extension. I have it "working" in that it will serve the page with all the correct rewrites in both the URL and the HTML code. However, when I try to submit a form (including logging in to redmine), IIS gives me one of the the following errors: Your browser sent a request that this server could not understand. or The specified CGI application encountered an error and the server terminated the process. Here's the setup: Redmine installed on a local Windows XP machine using the Bitnami all-in-one installer, which includes: Apache 2 Ruby-on-Rails MySQL Redmine Thin Redmine runs locally at http:/localhost/redmine Redmine runs over the intranet http:/146.18.236.xxx/redmine Windows Server + IIS 7.5 serving up an ASP.NET intranet web application mydept.mycompany.com IIS Extensions Url Rewrite and AAR installed Reverse proxy settings for IIS (shown below) to serve Redmine at mydept.mycompany.com/workflow <rewrite> <rules> <rule name="Route requests for workflow to redmine server" stopProcessing="true"> <match url="^workflow/?(.*)" /> <conditions> <add input="{CACHE_URL}" pattern="^(https?)://" /> </conditions> <action type="Rewrite" url="{C:1}://146.18.236.xxx/redmine/{R:1}" logRewrittenUrl="true" /> <serverVariables> <set name="HTTP_ACCEPT_ENCODING" value="" /> <set name="ORIGINAL_HOST" value="{HTTP_HOST}" /> </serverVariables> </rule> </rules> <outboundRules rewriteBeforeCache="true"> <clear /> <preConditions> <preCondition name="isHTML" logicalGrouping="MatchAny"> <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/html" /> <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/plain" /> <add input="{RESPONSE_CONTENT_TYPE}" pattern="^application/.*xml" /> </preCondition> <preCondition name="isRedirection"> <add input="{RESPONSE_STATUS}" pattern="3\d\d" /> </preCondition> </preConditions> <rule name="Rewrite outbound relative URLs in tags" preCondition="isHTML"> <match filterByTags="A, Area, Base, Form, Frame, Head, IFrame, Img, Input, Link, Script" pattern="^/redmine/(.*)" /> <action type="Rewrite" value="/workflow/{R:1}" /> </rule> <rule name="Rewrite outbound absolute URLs in tags" preCondition="isHTML"> <match filterByTags="A, Area, Base, Form, Frame, Head, IFrame, Img, Input, Link, Script" pattern="^(https?)://146.18.236.xxx/redmine/(.*)" /> <action type="Rewrite" value="{R:1}://mydept.mycompany.com/workflow/{R:2}" /> </rule> <rule name="Rewrite tags with hypenated properties missed by IIS bug" preCondition="isHTML"> <!-- http://forums.iis.net/t/1200916.aspx --> <match filterByTags="None" customTags="" pattern="(\baction=&quot;|\bsrc=&quot;|\bhref=&quot;)/redmine/(.*?)(&quot;)" /> <conditions logicalGrouping="MatchAll" trackAllCaptures="true" /> <action type="Rewrite" value="{R:1}/workflow/{R:2}{R:3}" /> </rule> <rule name="Rewrite Location Header" preCondition="isRedirection"> <match serverVariable="RESPONSE_LOCATION" pattern="^http://[^/]+/(.*)" /> <conditions> <add input="{ORIGINAL_URL}" pattern=".+" /> <add input="{URL}" pattern="^/(workflow|redmine)/.*" /> </conditions> <action type="Rewrite" value="http://{ORIGINAL_URL}/{C:1}/{R:1}" /> </rule> </outboundRules> </rewrite> <urlCompression dynamicCompressionBeforeCache="false" /> Any help that you can provide would be appreciated. I get the impression that I'm close adn that it is just one little setting here or there, but I can't seem to make it work.

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• How to initiate chatting between two clients and two clients only, using applets and servlets?

  - by mithun1538

  Hello everyone, I first need to apologize for my earlier questions. (You can check my profile for them)They seemed to ask more questions than give answers. Hence, I am laying down the actual question that started all them absurd questions. I am trying to design a chat applet. Till now, I have coded the applet, servlet and communication between the applet and the servlet. The code in the servlet side is such that I was able to establish chatting between clients using the applets, but the code was more like a broadcast all feature, i.e. all clients would be chatting with each other. That was my first objective when I started designing the chat applet. The second step is chatting between only two specific users, much like any other chat application we have. So this was my idea for it: I create an instance of the servlet that has the 'broadcast-all' code. I then pass the address of this instance to the respective clients. 2 client applets use the address to then chat. Technically the code is 'broadcast-all', but since only 2 clients are connected to it, it gives the chatting between two clients feature. Thus, groups of 2 clients have different instances of the same servlet, and each instance handles chatting between two clients at a max. However, as predicted, the idea didn't materialize! I tried to create an instance of the servlet but the only solution for that was using sessions on the servlet side, and I don't know how to use this session for later communications. I then tried to modify my broadcast-all code. In that code, I was using classes that implemented Observer and Observable interfaces. So the next idea that I got was: Create a new object of the Observable class(say class_1). This object be common to 2 clients. 2 clients that wish to chat will use same object of the class_1. 2 other clients will use a different object of class_1. But the problem here lies with the class that implements the Observer interface(say class_2). Since this has observers monitoring the same type of class, namely class_1, how do I establish an observer monitoring one object of class_1 and another observer monitoring another object of the same class class_1 (Because notifyObservers() would notify all the observers and I can't assign a particular observer to a particular object)? I first decided to ask individual problems, like how to create instances of servlets, using objects of observable and observer and so on in stackoverflow... but I got confused even more. Can anyone give me an idea how to establish chatting between two clients only?(I am using Http and not sockets or RMI). Regards, Mithun. P.S. Thanks to all who replied to my previous (absurd) queries. I should have stated the purpose earlier so that you guys could help me better.

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• Should I be using the command pattern? Seems like a lot of work...

  - by Fedor

  My Room class has a lot of methods I used before I decided to use the command pattern. Previously, I was invoking a lot of commands and now it seems I have to make a method in my roomParser class for every method. If I wanted to invoke say, setHotelCode I would have to create a method in roomParser that iterates through and invokes the method. Is this the way I should be using the command pattern? <?php interface Parseable { public function parse( $arr, $dept ); } class Room implements Parseable { protected $_adults; protected $_kids; protected $_startDate; protected $_endDate; protected $_hotelCode; protected $_sessionNs; protected $_minRate; protected $_maxRate; protected $_groupCode; protected $_rateCode; protected $_promoCode; protected $_confCode; protected $_currency = 'USD'; protected $_soapAction; protected $_soapHeaders; protected $_soapServer; protected $_responseXml; protected $_requestXml; public function __construct( $startdate,$enddate,$rooms=1,$adults=2,$kids=0 ) { $this->setNamespace(SESSION_NAME); $this->verifyDates( $startdate, $enddate ); $this->_rooms= $rooms; $this->_adults= $adults; $this->_kids= $kids; $this->setSoapAction(); $this->setRates(); } public function parse( $arr, $dept ) { $this->_price = $arr * $dept * rand(); return $this; } public function setNamespace( $namespace ) { $this->_sessionNs = $namespace; } private function verifyDates( $startdate, $enddate ) {} public function setSoapAction( $str= 'CheckAvailability' ) { $this->_soapAction = $str; } public function setRates( $rates='' ) { } public function setHotelCode($code ) { $this->_hotelCode = $code; } private function getSoapHeader() { return '<?xml version="1.0" encoding="utf-8"?> <soap:Header> </soap:Header>'; } private function getSoapFooter() { return '</soap:Envelope>'; } private function getSource() { return '<POS> <Source><RequestorId ID="" ID_Context="" /></Source> </POS>'; } function requestXml() { $this->_requestXml = $this->getSoapHeader(); $this->_requestXml .='<soap:Body></soap:Body>'; return $this->_requestXml; } private function setSoapHeaders ($contentLength) { $this->_soapHeaders = array('POST /url HTTP/1.1', 'Host: '.SOAP_HOST, 'Content-Type: text/xml; charset=utf-8', 'Content-Length: '.$contentLength); } } class RoomParser extends SplObjectStorage { public function attach( Parseable $obj ) { parent::attach( $obj ); } public function parseRooms( $arr, $dept ) { for ( $this->rewind(); $this->valid(); $this->next() ) { $ret = $this->current()->parse( $arr, $dept ); echo $ret->getPrice(), PHP_EOL; } } } $arrive = '12/28/2010'; $depart = '01/02/2011'; $rooms = new RoomParser( $arrive, $depart); $rooms->attach( new Room( '12/28/2010', '01/02/2011') ); $rooms->attach( new Room( '12/29/2010', '01/04/2011') ); echo $rooms->count(), ' Rooms', PHP_EOL; Edit: I'm thinking it may be easier if I made the RoomParser less generic by storing properties that all the objects will share. Though I'll probably have to make methods if I want to override for a certain object.

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• Securing an ADF Application using OES11g: Part 2

  - by user12587121

  To validate the integration with OES we need a sample ADF Application that is rich enough to allow us to test securing the various ADF elements.  To achieve this we can add some items including bounded task flows to the application developed in this tutorial. A sample JDeveloper 11.1.1.6 project is available here. It depends on the Fusion Order Demo (FOD) database schema which is easily created using the FOD build scripts.In the deployment we have chosen to enable only ADF Authentication as we will delegate Authorization, mostly, to OES.The welcome page of the application with all the links exposed looks as follows: The Welcome, Browse Products, Browse Stock and System Administration links go to pages while the Supplier Registration and Update Stock are bounded task flows.  The Login link goes to a basic login page and once logged in a link is presented that goes to a logout page.  Only the Browse Products and Browse Stock pages are really connected to the database--the other pages and task flows do not really perform any operations on the database. Required Security Policies We make use of a set of test users and roles as decscribed on the welcome page of the application.  In order to exercise the different authorization possibilities we would like to enforce the following sample policies: Anonymous users can see the Login, Welcome and Supplier Registration links. They can also see the Welcome page, the Login page and follow the Supplier Registration task flow.  They can see the icon adjacent to the Login link indicating whether they have logged in or not. Authenticated users can see the Browse Product page. Only staff granted the right can see the Browse Product page cost price value returned from the database and then only if the value is below a configurable limit. Suppliers and staff can see the Browse Stock links and pages.  Customers cannot. Suppliers can see the Update Stock link but only those with the update permission are allowed to follow the task flow that it launches.  We could hide the link but leave it exposed here so we can easily demonstrate the method call activity protecting the task flow. Only staff granted the right can see the System Administration link and the System Administration page it accesses. Implementing the required policies In order to secure the application we will make use of the following techniques: EL Expressions and Java backing beans: JSF has the notion of EL expressions to reference data from backing Java classes.  We use these to control the presentation of links on the navigation page which respect the security contraints.  So a user will not see links that he is not allowed to click on into. These Java backing beans can call on to OES for an authorization decision.  Important Note: naturally we would configure the WLS domain where our ADF application is running as an OES WLS SM, which would allow us to efficiently query OES over the PEP API.  However versioning conflicts between OES 11.1.1.5 and ADF 11.1.1.6 mean that this is not possible.  Nevertheless, we can make use of the OES RESTful gateway technique from this posting in order to call into OES. You can easily create and manage backing beans in Jdeveloper as follows: Custom ADF Phase Listener: ADF extends the JSF page lifecycle flow and allows one to hook into the flow to intercept page rendering.  We use this to put a check prior to rendering any protected pages, again calling on to OES via the backing bean.  Phase listeners are configured in the adf-settings.xml file.  See the MyPageListener.java class in the project.  Here, for example,  is the code we use in the listener to check for allowed access to the sysadmin page, navigating back to the welcome page if authorization is not granted:                         if (page != null && (page.equals("/system.jspx") || page.equals("/system"))){                             System.out.println("MyPageListener: Checking Authorization for /system");                             if (getValue("#{oesBackingBean.UIAccessSysAdmin}").toString().equals("false") ){                                   System.out.println("MyPageListener: Forcing navigation away from system" +                                       "to welcome");                                 NavigationHandler nh = fc.getApplication().getNavigationHandler();                                   nh.handleNavigation(fc, null, "welcome");                               } else {                                 System.out.println("MyPageListener: access allowed");                              }                         } Method call activity: our app makes use of bounded task flows to implement the sequence of pages that update the stock or allow suppliers to self register.  ADF takes care of ensuring that a bounded task flow can be entered by only one page.  So a way to protect all those pages is to make a call to OES in the first activity and then either exit the task flow or continue depending on the authorization decision.  The method call returns a String which contains the name of the transition to effect. This is where we configure the method call activity in JDeveloper: We implement each of the policies using the above techniques as follows: Policies 1 and 2: as these policies concern the coarse grained notions of controlling access to anonymous and authenticated users we can make use of the container’s security constraints which can be defined in the web.xml file.  The allPages constraint is added automatically when we configure Authentication for the ADF application.  We have added the “anonymousss” constraint to allow access to the the required pages, task flows and icons: <security-constraint>    <web-resource-collection>      <web-resource-name>anonymousss</web-resource-name>      <url-pattern>/faces/welcome</url-pattern>      <url-pattern>/afr/*</url-pattern>      <url-pattern>/adf/*</url-pattern>      <url-pattern>/key.png</url-pattern>      <url-pattern>/faces/supplier-reg-btf/*</url-pattern>      <url-pattern>/faces/supplier_register_complete</url-pattern>    </web-resource-collection>  </security-constraint> Policy 3: we can place an EL expression on the element representing the cost price on the products.jspx page: #{oesBackingBean.dataAccessCostPrice}. This EL Expression references a method in a Java backing bean that will call on to OES for an authorization decision.  In OES we model the authorization requirement by requiring the view permission on the resource /MyADFApp/data/costprice and granting it only to the staff application role.  We recover any obligations to determine the limit.  Policy 4: is implemented by putting an EL expression on the Browse Stock link #{oesBackingBean.UIAccessBrowseStock} which checks for the view permission on the /MyADFApp/ui/stock resource. The stock.jspx page is protected by checking for the same permission in a custom phase listener—if the required permission is not satisfied then we force navigation back to the welcome page. Policy 5: the Update Stock link is protected with the same EL expression as the Browse Link: #{oesBackingBean.UIAccessBrowseStock}.  However the Update Stock link launches a bounded task flow and to protect it the first activity in the flow is a method call activity which will execute an EL expression #{oesBackingBean.isUIAccessSupplierUpdateTransition}  to check for the update permission on the /MyADFApp/ui/stock resource and either transition to the next step in the flow or terminate the flow with an authorization error. Policy 6: the System Administration link is protected with an EL Expression #{oesBackingBean.UIAccessSysAdmin} that checks for view access on the /MyADF/ui/sysadmin resource.  The system page is protected in the same way at the stock page—the custom phase listener checks for the same permission that protects the link and if not satisfied we navigate back to the welcome page. Testing the Application To test the application: deploy the OES11g Admin to a WLS domain deploy the OES gateway in a another domain configured to be a WLS SM. You must ensure that the jps-config.xml file therein is configured to allow access to the identity store, otherwise the gateway will not b eable to resolve the principals for the requested users.  To do this ensure that the following elements appear in the jps-config.xml file: <serviceProvider type="IDENTITY_STORE" name="idstore.ldap.provider" class="oracle.security.jps.internal.idstore.ldap.LdapIdentityStoreProvider">             <description>LDAP-based IdentityStore Provider</description>  </serviceProvider> <serviceInstance name="idstore.ldap" provider="idstore.ldap.provider">             <property name="idstore.config.provider" value="oracle.security.jps.wls.internal.idstore.WlsLdapIdStoreConfigProvider"/>             <property name="CONNECTION_POOL_CLASS" value="oracle.security.idm.providers.stdldap.JNDIPool"/></serviceInstance> <serviceInstanceRef ref="idstore.ldap"/> download the sample application and change the URL to the gateway in the MyADFApp OESBackingBean code to point to the OES Gateway and deploy the application to an 11.1.1.6 WLS domain that has been extended with the ADF JRF files. You will need to configure the FOD database connection to point your database which contains the FOD schema. populate the OES Admin and OES Gateway WLS LDAP stores with the sample set of users and groups.  If  you have configured the WLS domains to point to the same LDAP then it would only have to be done once.  To help with this there is a directory called ldap_scripts in the sample project with ldif files for the test users and groups. start the OES Admin console and configure the required OES authorization policies for the MyADFApp application and push them to the WLS SM containing the OES Gateway. Login to the MyADFApp as each of the users described on the login page to test that the security policy is correct. You will see informative logging from the OES Gateway and the ADF application to their respective WLS consoles. Congratulations, you may now login to the OES Admin console and change policies that will control the behaviour of your ADF application--change the limit value in the obligation for the cost price for example, or define Role Mapping policies to determine staff access to the system administration page based on user profile attributes. ADF Development Notes Some notes on ADF development which are probably typical gotchas: May need this on WLS startup in order to allow us to overwrite credentials for the database, the signal here is that there is an error trying to access the data base: -Djps.app.credential.overwrite.allowed=true Best to call Bounded Task flows via a CommandLink (as opposed to a go link) as you cannot seem to start them again from a go link, even having completed the task flow correctly with a return activity. Once a bounded task flow (BTF) is initated it must complete correctly  via a return activity—attempting to click on any other link whilst in the context of a  BTF has no effect.  See here for example: When using the ADF Authentication only security approach it seems to be awkward to allow anonymous access to the welcome and registration pages.  We can achieve anonymous access using the web.xml security constraint shown above (where no auth-constraint is specified) however it is not clear what needs to be listed in there….for example the /afr/* and /adf/* are in there by trial and error as sometimes the welcome page will not render if we omit those items.  I was not able to use the default allPages constraint with for example the anonymous-role or the everyone WLS group in order to be able to allow anonymous access to pages. The ADF security best practice advises placing all pages under the public_html/WEB-INF folder as then ADF will not allow any direct access to the .jspx pages but will only allow acces via a link of the form /faces/welcome rather than /faces/welcome.jspx.  This seems like a very good practice to follow as having multiple entry points to data is a source of confusion in a web application (particulary from a security point of view). In Authentication+Authorization mode only pages with a Page definition file are protected.  In order to add an emty one right click on the page and choose Go to Page Definition.  This will create an empty page definition and now the page will require explicit permission to be seen. It is advisable to give a unique context root via the weblogic.xml for the application, as otherwise the application will clash with any other application with the same context root and it will not deploy

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• Can you use back references in the pattern part of a regular expression?

  - by Camsoft

  I there a way to back reference in the regular expression pattern? Example input string: Here is "quoted text" some quoted text. Say I want to pull out the quoted text, I could create the following expression: "([^"]+)" This regular expression would match quoted text. Say I want it to also support single quotes, I could change the expression to: ["']([^"']+)["'] But what if the input string has a mixture of quotes say Here is 'quoted text" some quoted text. I would not want the regex to match. Currently the regex in the second example would still match. What I would like to be able to do is if the first quote is a double quote then the closing quote must be a double. And if the start quote is single quote then the closing quote must be single. Can I use a back reference to achieve this?

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