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• java System.nanoTime is really slow. Is it possible to implement a high performance java profiler?

  - by willpowerforever

  I did a test and found the overhead of a function call to System.nanoTime() is at least 500 ns on my machine. Seemed that it is very hard to have a high performance java profiler. For enterprise software, suppose a function takes about 350 seconds and has 12,500,000,000 times of method calls. Therefore, the number of calls to System.nanoTime() is: 12,500,000,000 * 2 = 25,000,000,000 (one for start timestamp, one for end timestamp) And the overhead of System.nanoTime in total is: 500 ns * 25,000,000,000 = 500 * 25000 s = 12500000s. Note: all data from real case. Any better way to acquire the timestamp?

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• Identifying PHP unused variables (in Emacs)?

  - by Roberto Aloi

  Is it somehow possible to identify unused variables in a PHP file in Emacs? With other languages, this is possible by using tools such as flymake. I've already enabled Flymake to show syntax errors for my PHP files on the fly, but still it's frustrating that PHP logic errors are sometimes due to situations like: <?php $foo = whatever(); $bar = something($fo); ... Note the typo on $foo that will contribute to the developer's headache and to his exorbitant use of coffee.

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• Git: removing selected commits from repository

  - by xk0der

  I would like to remove selected commits from a linear commit tree, so that the commits do not show in the commit log. My commit tree looks something like: R--A--B--C--D--E--HEAD I would like to remove the B and C commits. So that they do not show in the commit log, but changes from A to D should be preserved. Maybe by introducing a single commit, so that B and C become BC and the tree looks like. R--A--BC--D--E--HEAD Or, ideally, after A comes D directly. D' representing changes from A to B, B to C and C to D. R--A--D'--E--HEAD Is this possible? if yes, how? Some notes that might be helpful: This is a fairly new project so has no branches as of now, hence no merges as well. Side note: It's a personal project, so no, I'm not trying to destroy any evidence :)

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• Authenticating to multiple OUs in Active Directory

  - by Jaxidian

  I'm using the Active Directory Membership Provider with the following configuration: <connectionStrings> <add name="MyConnString" connectionString="LDAP://domaincontroller/OU=Product Users,DC=my,DC=domain,DC=com" /> </connectionStrings> <membership defaultProvider="MyProvider"> <providers> <clear /> <add name="MyProvider" connectionStringName="MyConnString" connectionUsername="my.domain.com\service_account" connectionPassword="biguglypassword" type="System.Web.Security.ActiveDirectoryMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> </providers> </membership> This works perfectly except it requires ALL of my users to be in the "Product Users" OU when I would actually like to have all of my users organized into various child OUs under our "Product Users" OU. Is this possible? (Note that this is a partial repost of this question but the question I'm asking here was never answered there.)

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• JavaScript To Strip Page For URL

  - by Russell C.

  We have a javascript function we use to track page stats internally. However, the URLs it reports many times include the page numbers for search results pages which we would rather not be reported. The pages that are reports are of the form: http://www.test.com/directory1/2 http://www.test.com/directory1/subdirectory1/15 http://www.test.com/directory3/1113 Instead we'd like the above reported as: http://www.test.com/directory1 http://www.test.com/directory1/subdirectory1 http://www.test.com/directory3 Please note that the numbered 'directory' and 'subdirectory' names above are just for example purposes and that the actual subdirectory names are all different, don't necessarily include numbers at the end of the directory name, and can be many levels deep. Currently our JavaScript function produces these URLs using the code: var page = location.hostname+document.location.pathname; I believe we need to use the JavaScript replace function in combination with some regex but I'm at a complete loss as to what that would look like. Any help would be much appreciated! Thanks in advance!

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• Dynamically determining table name given field name in SQL server

  - by Salman A

  Strange situation: I am trying to remove some hard coding from my code. There is a situation where I have a field, lets say "CityID", and using this information, I want to find out which table contains a primary key called CityID. Logically, you'd say that it's probably a table called "City" but it's not... that table is called "Cities". There are some other inconsistencies in database naming hence I can never be sure if removing the string "ID" and finding out the plural will be sufficient. Note: Once I figure out that CityID refers to a table called Cities, I will perform a join to replace CityID with city name on the fly. I will appreciate if someonw can also tell me how to find out the first varchar field in a table given its name.

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• What is a good open source job scheduler in Java?

  - by Boaz

  Hi, In an application harvesting (many) RSS feeds, I want to dynamically schedule the feed downloaders based on the following criteria: The speed at which content are generated - source which produce content at a higher rate need to be visited more often. After downloading a feed, its content is analyzed and based on the current rate of publication the next run time is determined for the feed. Note that this is dynamically changing. Sometimes a feed is very active and sometimes it is slow. Every RSS feed should be visited at least once an hour. While the second one is done by most schedulers but the first one is more problematic. What JAVA-based open source scheduler would you recommend for the task? (and why ;) ) Thanks! Boaz

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• How to Check for record existence and do Insert in MYSQL ?

  - by karthik

  How to Check for record existence and do Insert or Update in MYSQL ? I have a script, which has set of Insert statements for multiple tables. Now when i try to execute the Insert statement, i want to do the following.. Check for the record existence and then do Insert or Update. If the Record is not exist do Insert. If the Record is already do not do anything. How to accomplish this ? Note : The script with Insert Statements are generated programmaticaly using SP

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• got a question about Linked-List in java code.

  - by glacier89

  Linked-List: Mirror Consider the following private class for a node of a singly-linked list of integers: private class Node{ public int value; public Node next; } A wrapper-class, called, ListImpl, contains a pointer, called start to the first node of a linked list of Node. Write an instance-method for ListImpl with the signature: public void mirror(); That makes a reversed copy of the linked-list pointed to by start and appends that copy to the end of the list. So, for example the list: start 1 2 3 after a call to mirror, becomes: start 1 2 3 3 2 1 Note: in your answer you do not need to dene the rest of the class for ListImpl just the mirror method.

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• Folder cleanup with PowerShell

  - by 280Z28

  I'd like to clean up some directories after my script runs by deleting certain folders and files from the current directory if they exist. Originally, I structured the script like this: if (Test-Path Folder1) { Remove-Item -r Folder1 } if (Test-Path Folder2) { Remove-Item -r Folder2 } if (Test-Path File1) { Remove-Item File1 } Now that I have quite a few items listed in this section, I'd like to clean it up. How can I do so? Side note: The items are cleaned up before the script runs, since they are left over from the previous run in case I need to examine them.

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• Problem in VS2010 IDE in analog monitor in a dual-monitor setup

  - by Samik R.

  I am using VS2010 Premium with a dual-window setup. One of the monitors is on a digital (DVI) cable and other one is on an analog (VGA) cable. I have noticed that when I put VS2010 in the analog monitor, there are garbled texts and refresh problems while coding and/or scrolling. This does not seem to be the case when I put VS2010 in the digital monitor. Note that, I am not expanding VS IDE to use 2 screens, just making it 1 full screen, either analog or digital. Has anyone else experienced this problem? I also work with VS2008 and have not seen this problem in either screen. VS IDE has started using WPF from the 2010 release, not sure if this has something to do with it.

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• Is my natural deduction proof correct?

  - by Danny King

  Hello, Given the sequent: |- p v ¬p (that is, no left-hand-side, derives p or not p) I have taken this from http://www.danielclemente.com/logica/dn.en-node38.html but I got a different proof to his solution. I think my simpler proof is correct but could someone verify it for me to check I have understood it? I'd appreciate it very much! 1. ¬(p v ¬p) assumption {note this is equivalent to ¬p ^ p} 2. ¬p ^elimination 1 3. p ^elimination 1 4. contradiction ¬elimination 3, 2 5. p v ¬p ¬introduction 1-4 Thanks!

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• Is it possible to join these two regex expressions into one?

  - by Pure.Krome

  Hi folks, i have the following two regular expressions (in order btw). 1. ^~/buying/(.*)\?(.*) => foo= group 1 baa= group 2. 2. ^~/buying/(.*) => foo= group 1 baa= nothing/empty/null/baibai What's i'm trying to do is, if the url has a questionmark, then split it into two groups. Otherwise, just throw all the stuff into the first group. the reason why the order is important for me, is that if i switch them round, the '?' regex will never get fired because the #2 expression (above) will catch all. So .. can this be re-fixed? NOTE: I have tried using this website** to help me debug/tweak .. but I can't figure it out. ** I have no affiliation with that site.

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• Google's OpenID identifier is different depending on the "consumer" domain name. How to avoid potent

  - by JohnnyO

  I'm currently testing an OpenID implementation, and I'm noticing that Google sends a different identifier for different consuming host name / domain name, even for the same user. For example, Google sends a different identifier when the requesting site is localhost, compared to the identifier they send when the requesting site is 127.0.0.1 for the same user. Note: I haven't actually tested this using public domain names, but I can't see why the behavior would be any different. My concern with Google's behavior is that if we ever choose to change our website domain name in the future, then users will no longer be able to log in to the website using Google's OpenId as the identity provider. This seems to be a big problem. Am I missing something, or are all OpenID consuming sites faced with this potential problem? I've also tested this with MyOpenId, but the identifier that MyOpenId creates is fixed, so this wouldn't be a problem with them. Thanks.

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• Why shouldnt i use flash again?

  - by acidzombie24

  I heard many times i should avoid flash for my website. Yet no one has told me a good reason. I searched for reasons and i see many that are not true (such as text in flash are not indexable by search engines) or may not necessarily be true or significant enough (eating more bandwidth. Would a JS equivalent be bigger or smaller?). My site uses flash to playback sound (m4a). I dont have to worry about indexing, the back button not working, etc. But i have feeling there may be other reasons. What are reasons i shouldnt use flash on my website. I'll note one, the fact iphone/itouch and mobile devices does not support it. Not a big deal for most sites and is obvious. What are reason to avoid flash on my site?

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• Odd visual issue with ListView item layout with two pressable pieces

  - by jnylen

  I wanted to make a ListView where the items have two pressable pieces, like the layouts that show up in a couple of places in the stock Android phone/contacts application: I have the layout working fine, including handling events from each piece separately, except for a visual issue when the smaller piece is pressed. In my application the smaller piece only gets a small ellipse for the background when it is pressed, like this: Note that is actually not my application - that is NubDial, but my application has the same problem. Since NubDial uses the exact same XML layout as the phone app, I'm not sure how relevant the list item layouts are, but here they are anyway: Contacts list: contacts_list_item.xml NubDial: contacts_list_item.xml Does anybody know what might be happening there?

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• How do I use Some/None Options in this F# example?

  - by Phobis

  I am new to F# and I have this code: if s.Contains("-") then let x,y = match s.Split [|'-'|] with | [|a;b|] -> int a, int b | _ -> 0,0 Notice that we validate that there is a '-' in the string before we split the string, so the match is really unnecessary. Can I rewrite this with Options? I changed this code, it was originally this (but I was getting a warning): if s.Contains("-") then let [|a;b|] = s.Split [|'-'|] let x,y = int a, int b NOTE: I am splitting a range of numbers (range is expressed in a string) and then creating the integer values that represent the range's minimum and maximum.

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• Remote DocumentRoot in Apache gives a 404

  - by kshouler

  I have the following specified in my httpd.conf, but I get a 404 when attempting to connect to the server from another machine. If I set the docroot to the default htdocs directory, everything works fine. (note.. I've also tried replacing the "//storage/data1" part of the path with the network drive letter "U:") ServerRoot "C:/Program Files/Apache Software Foundation/Apache2.2" DocumentRoot "//storage/data1/Engineering/Product Development" <Directory "//storage/data1/Engineering/Product Development"> Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all </Directory>

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• How does git-diff generate hunk descriptions?

  - by RobM

  (git version 1.6.5.7) When I run git diff the output has a nice scope hint after the line numbers for my Python scripts, e.g.: diff --git a/file.py b/file.py index 024f5bb..c3b5c56 100644 --- a/file.py +++ b/file.py @@ -14,6 +14,8 @@ TITF: Test Infrastructure Tags Format ... @@ -1507,13 +1533,16 @@ class Tags( object ): ... Note that the line numbers are followed by TITF: Test Infrastructure Tags Format and class Tags( object ):. The first patch applies to module scope and the description TITF: Test Infrastructure Tags Format is the module's description. The second patch applies to a method of the Tags class. How does git generate these descriptions? How can I tweak them to show the method name that the patch applies to?

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• How to impose maxlength on textArea in HTML , Javascript

  - by Rakesh Juyal

  I would like to have some functionality by which if i write <textarea maxlength="50"></textarea> <textarea maxlength="150"></textarea> <textarea maxlength="250"></textarea> it will automatically impose the maxlength on the textArea. If possible please donot provide the solution in JQuery. Note: This can be done if i do something like this: <textarea onkeypress="return imposeMaxLength(event, this, 110);" rows="4" cols="50"> function imposeMaxLength(Event, Object, MaxLen) { return (Object.value.length <= MaxLen)||(Event.keyCode == 8 ||Event.keyCode==46||(Event.keyCode>=35&&Event.keyCode<=40)) } copied from another thread But the point is I don't want to write onKeyPress and onKeyUp every time i declare a textArea.

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• AbsoluteTime with numeric argument behaves strangely.

  - by dreeves

  This is strange: DateList@AbsoluteTime[596523] returns {2078, 7, 2, 2, 42, 9.7849} But DateList@AbsoluteTime[596524] returns {1942, 5, 26, 20, 28, 39.5596} The question: What's going on? Note that AbsoluteTime with a numeric argument is undocumented. (I think I now know what it's doing but figured this is useful to have as a StackOverflow question for future reference; and I'm curious if there's some reason for that magic 596523 number.) PS: I encountered this when writing these utility functions for converting to and from unix time in Mathematica: (* Using Unix time (an integer) instead of Mathematica's AbsoluteTime... *) tm[x___] := AbsoluteTime[x] (* tm is an alias for AbsoluteTime. *) uepoch = tm[{1970}, TimeZone->0]; (* unixtm works analogously to tm. *) unixtm[x___] := Round[tm[x]-uepoch] (* tm & unixtm convert between unix & *) unixtm[x_?NumericQ] := Round[x-uepoch] (* mma epoch time when given numeric *) tm[t_?NumericQ] := t+uepoch (* args. Ie, they're inverses. *)

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• <transport> tag within the ServicesReferences.ClientConfig

  - by jdiaz

  I've created a WCF service and added it to an existing Silverlight application that I am working on. When I run the silverlight application in debug mode it fails when I reference the WCF web service. Unrecognized element '' in service reference configuration. Note that only a subset of the Windows Communication Foundation configuration functionality is available in Silverlight. After searching around apparently the following line is causing the app to fail: <transport> <extendedProtectionPolicy policyEnforcement="Never" /> </transport> After removing the above lines everything works. What is the issue here? Should I believing this code in and configuring something else?

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• Partial form with nested routes

  - by jerhinesmith

  I have two models -- User and Entry -- that are related through a has_many relationship (a User has many Entries). I'm using RESTful routing, and have the following in my routes.rb file: map.resource :user, :controller => "users" do |user| user.resources :entries end This seems to work, but in my partial _form file, when I do this: form_for [@current_user, @entry] do |f| # Form stuff end It generates a URL like this: /user/entries.%23%3Cuser:0xb6a6aea8%3E instead of /user/entries Am I missing something? I should note that the correct classes are applied to the form when doing creation vs. editing, so it does seem to be correctly interpreting what I'm trying to do -- it's just that I can't submit the form to an invalid url.

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• Assembly not referenced error with Interactive Brokes ActiveX API

  - by Lirik

  I'm attempting to use the Interactive Brokers ActiveX API, but I'm having a little trouble: error CS0012: The type 'System.Windows.Forms.AxHost' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. My code: namespace DataFeed.Gateway { class IBGateway : IGateway { private AxTWSLib.AxTws tws; //<-- the error line //... } } I have a console application, so I'm wondering if that might be the reason why ActiveX is not working... or is there something else going on here? Maybe I should add the AxTWSlib.dll to the GAC, but do I really have to? If I add the dll as a resource, then I thought that I don't need to add it to the GAC. Note: I've dropped the AxTWSlib.dll in my project folder and I've added it to the project references... no problems there.

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• Is it possible to use AsyncTask in a Service class ?

  - by Spredzy

  Everything is in the title. On the official documentations it is stated that Note that services, like other application objects, run in the main thread of their hosting process and AsyncTask only works if it is executed in the UIThread. So is it possible to use AsyncTask in a Service class? I am trying to do so but I'm always getting the same error 05-01 18:09:25.487: ERROR/JavaBinder(270): java.lang.ExceptionInInitializerError ... 05-01 18:09:25.487: ERROR/JavaBinder(270): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() Am I doing something wrong or is this just impossible ?

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