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• java virtual machine - how does it allocate resources?

  - by Will

  I am testing the performance of a data streaming system that supports continuous queries. This is how it works: - There is a polling service which sends data to my system. - As data passes into the system, each query evaluates based on a window of the stream at the current time. - The window slides as data passes in. My problem is this, when I add more queries to the system, I should expect the throughput to decrease because it can't cope the data rate. However, I actually observe an increase in throughput. I can't understand why this is the case and I am guessing that it's something to do with the way the JVM allocates CPU, memory etc. Can anyone shed any light to my problem?

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• Is a Critical Section around an integer getter and setter redundant?

  - by Tim Gradwell

  Do critical sections inside trivial int accessors actually do anything useful? int GetFoo() { CriticalSection(crit_id); return foo; } void SetFoo(int value) { CriticalSection(crit_id); foo = value; } Is it possible for two threads to be attempting to read and write foo simultaneously? I'd have thought 'no' unless integers are written byte-at-a-time, in which case I can see the use. But I'd have though modern cpus would read/write integers in a single atomic action...

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• Is it possible to supply template parameters when calling operator()?

  - by Paul

  I'd like to use a template operator() but am not sure if it's possible. Here is a simple test case that won't compile. Is there something wrong with my syntax, or is this simply not possible? struct A { template<typename T> void f() { } template<typename T> void operator()() { } }; int main() { A a; a.f<int>(); // This compiles. a.operator()<int>(); // This compiles. a<int>(); // This won't compile. return 0; }

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• Can you /should you learn SEO techniques

  - by Mark

  I know very little about Search engine optimization however from discussions with other I am now unsure where to start. Are there any books or do these date so quickly that they are obsolete? Do all website give you mis-information or are there any reliable sources? Is it just a case of trial and error and in turn experience? Is it event worth learning the techniques as search engines change their algorithms so regularly? I wonder if it just better to spend the time to ensure you have a regularly updated will written web site with quality content, site map, quality links etc..

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• Explanation of NSMutableURLRequest : setHTTPMethod

  - by kkmoslehpour

  I am new to objective c programming. I am currently trying to insert data into mysql database. I have read a couple links on this and could not find the exact answer I am looking for. Here is what I am trying to do: I have my app that user inputs a name in a text field and once the press the add button, it makes a connection to my php file and my php file does the rest of the work (using POST method) and adds the name to the mysql dataase. I have seen a lot of people use NSMutableURLRequest : setHTTPMethod :POST`` in their code (in my case my php file does that and I don't haveNSMutableURLRequest` included in my code and it works perfectly fine.) My questions are: Are there any benefits of including NSMutableURLRequest in your code when you can just call your php code to take care of the POST for you? What does NSMutableURLRequest exactly do and which way is more efficient?

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• Passing a generic class to a java function?

  - by rodo

  Is it possible to use Generics when passing a class to a java function? I was hoping to do something like this: public static class DoStuff { public <T extends Class<List>> void doStuffToList(T className) { System.out.println(className); } public void test() { doStuffToList(List.class); // compiles doStuffToList(ArrayList.class); // compiler error (undesired behaviour) doStuffToList(Integer.class); // compiler error (desired behaviour) } } Ideally the List.class and ArrayList.class lines would work fine, but the Integer.class line would cause a compile error. I could use Class as my type instead of T extends Class<List> but then I won't catch the Integer.class case above.

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• Java Scanner - next String until a | is found

  - by user1375883

  Currently I'm trying to read through some basic cells, in this format: +-------+-------+ | | | +-------+-------+ Now I need to get the string representation of the cell's contents and send it off to another method. The problem is that the cells have no pre-defined length. I'm reading these from a file, so my easiest option should be to just use the Scanner I already have set up. Problem is, I don't really know how for this case. I have a strong feeling that I need to use the pattern somehow, but I'm at a complete loss on how to do it. I could also probably just build it up somehow, but that strikes me as being painfully slow.

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• Displaying a well formatted table

  - by user1378680

  Please take a look at the picture below. The header for the second column is displaying DISTRICT under SENATORIAL. But that's not the case for the 2nd and 3rd Rows under the 2nd Column. What I want to achieve is that words/strings should not ba able to extend width of the table.... The CSS I'm using is beneath. table { width: 650px; font-family: calibri; word-wrap: break-word; margin-left: 115px; } th { padding: 3px; color: white; text-transform: uppercase; font-size: 12px; background-image: url(navbg.png); font-weight: normal; word-wrap: break-word; font-family: "Trebuchet MS"; } Image:

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• Jquery adding events

  - by JBone

  I want to add an event handler to some dynamically added elements. I simplified my problem into the basic code below. I am using the new JQuery 1.7 on feature to say "hey for all labels in the CancelSurvey id element call this notify function when they are clicked." function notify(event) { console.log(event.data.name); } $('#CancelSurvey').on('click', 'label', { name: $(this).attr("id") }, notify); I want to pass the id of the label as parameter "name". When I try to alert this it is undefined (they are defined in the html created). I believe that using the $(this) is not referencing the label selector in this case. It actually seems to be referencing the document itself. Any ideas on how to accomplish this?

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• Charts don't show up when subreport is included in group header in pentaho reporting 3.9.1-GA

  - by user2909808

  There is an issue concerning in sub-reports. I created a bar chart in report header. The sub report(inline) is placed in the Details of main report. In the sub report, the bar chart is placed in the group header. I imported the required parameters to the sub reports from the main report and also i have a sub query for the sub report.The expected output is to show an updated bar chart within each (inner) group of main report. However, the chart is only displayed in the last group occurence, although the chart area itself is allotted in every expected case. Can any one say me, what mistake i did.

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• Parent element selection problem?

  - by Starx

  My HTML is something like this <div id="mydiv" class="common"> <input type="text" id="text1" value="" /> <input type="text" id="text2" value="" /> </div> I am assigning a function on the onclick event of the textbox like this $(document).ready(function() { $(".common input").click(function() { //////// What I am trying to do is access the id of its parent // in this case it is "mydiv" alert($(this:parent).attr('id')); }); But it is not working

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• C++ setting up "flags"

  - by sub

  Example: enum Flags { A, B, C, D }; class MyClass { std::string data; int foo; // Flags theFlags; (???) } How can I achieve that it is possible to set any number of the "flags" A,B,C and D in the enum above in an instance of MyClass? My goal would be something like this: if ( MyClassInst.IsFlagSet( A ) ) // ... MyClassInst.SetFlag( A ); //... Do I have to use some array or vector? If yes, how? Are enums a good idea in this case?

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• Django Project Done and Working. Now What?

  - by Rodrogo

  Hi, I just finished what I would call a small django project and pretty soon it's going live. It's only 6 models but a fairly complex view layer and a lot of records saving and retrieving. Of course, forgetting the obvious huge amount of bugs that will, probably, fill my inbox to the top, what would it be the next step towards a website with best performance. What could be tweaked? I'm using jmeter a lot recently and feel confident that I have a good baseline for future performance comparisons, but the thing is: I'm not sure what is the best start, since I'm a greedy bastard that wants to work the least possible and gather the best results. For instance, should I try an approach towards infrastructure, like a distributed database, or should I go with the code itself and in that case, is there something that specifically results in better performance? In your experience, whats pays off more? Personal anecdotes are welcome, but some fact based opinions are even more. :) Thanks very much.

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• Mulitple words in any order using regex

  - by RC1140

  As the title says , i need to find 2 specific words in a sentence. But they can be in any order and any casing. How do i go about doing this using regex. E.g. This is a very long sentence used as a test From that sentence i need to extract the words test and long in any order i.e. test can be first or long can be first. UPDATE: What i did not mention the first part is it needs to be case insensitive as well

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• Difference between local and instance variables in ruby

  - by fflyer05

  I am working on a script that creates several fairly complex nested hash datastructures and then iterates through them conditionally creating database records. This is a standalone script using active record. After several minutes of running I noticed a significant lag in server responsiveness and discovered that the script, while being set to be nice +19, was enjoying a steady %85 - %90 total server memory. In this case I am using instance variables simply for readability. It helps knowing what is going to be re-used outside of the loop vs. what won't. Is there a reason to not use instance variables when they are not needed? Are there differences in memory allocation and management between local and instance variables? Would it help setting @variable = nil when its no longer needed?

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• How can I define a one-time event so that new handlers fire (once) even after the event has already occurred?

  - by harpo

  You know how this $(function() { ... }); will fire whether or not the "document ready" event has already occurred? I want to define an event like that. That event is a special case in jQuery. I'm wondering if a custom event can behave in the same way, using only the standard event mechanisms. Ideally, I'd like to be able to define handlers in the "normal" way: $(document).on("init.mything", function() { ... }); This works now if the above runs before init.mything is triggered. But if it doesn't, then the handler never runs. What makes this tricky is, I don't want to assume anything except that jQuery has loaded. Any ideas?

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• C++ methods which take templated classes as argument.

  - by Nils

  I have a templated class Vector<class T, int N> Where T is the type of the components (double for example) and n the number of components (so N=3 for a 3D vector) Now I want to write a method like double findStepsize(Vector<double,2> v) {..} I want to do this also for three and higher dimensional vectors. Of course I could just introduce further methods for higher dimensions, but the methods would have a lot of redundant code, so I want a more generic solution. Is there a way to create a method which takes a templated class without further specializing it (in this case without specifying T or N)? Like double findStepsize(Vector<T,N> v) ?

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• class T in c++ (your definition)

  - by JohnWong

  The one advantage of using class T in c++ is to reduce the time to redefine data types in a function, if those data types are defined in other function, for example, in int main. template <class T> void showabs(T number) { if (number < 0 ) number = -number; cout << number << endl; return 0; } int main() { int num1 = -4; float num2 = -4.23f; showabs(num1); showabs(num2); return 0; } So in this case, without class T, for each data type, we have to add its corresponding data-type condition, that is, another set of if statement for int, and another one for float. Am I correct?

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• How to redirect with .htaccess (keeping legacy links)

  - by Laurent

  Hello, I recently switched CMSes. While using Wordpress, I had this permalink convention: "/year/post". Now, I'd like to have "year/month/post". To keep legacy links, I need to redirect from "http://site.com/2009/sample-post" to "http://site.com/2009/01/sample-post". "01" should be permanent in this case. This is what I've got atm: RewriteEngine on RewriteCond $1 !^(images|system|themes|_|wp-content|mint|assets|favicon\.ico|robots\.txt|index\.php) [NC] RewriteRule ^(.*)$ /index.php?/$1 [L] Thanks in advance!

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• How do I create a dynamic method in PHP?

  - by sandelius

  I'm trying to extend my ActiveRecord class with some dynamic methods. I would like to be able to run this from my controller $user = User::find_by_username(param); $user = User::find_by_email(param); I've read a little about overloading and think that's the key. I'v got a static $_attributes in my AR class and I get the table name by pluralizing my model (User = users) in this case. How do I do this? All models extends the ActiveRecord class.

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• Is it possible to make a TListView search by the caption of a different column in Delphi?

  - by James

  Hi, When you set the Caption of a TListItem it seems to always set the Text for the first column in the row. When you start typing in the ListView it will search & select the closest match based on the caption of the first column. I have a situation where I need the caption of the first row to be empty, but still need the search functionality to work as normal (in this case the data I would be searching for may be in the 2nd/3rd column). Is this possible without using any 3rd party controls?

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• Vew not updating after scope update

  - by bsparacino

  Here is a very simple example of what I am trying to do Athlete.save(athlete,function(result) { $scope.athlete = result.athlete; }); The issue is that the $scope.athlete variable does not update in my view. In order to get it to update I have to do this Athlete.save(athlete,function(result) { $scope.athlete.fname = result.athlete.fname; $scope.athlete.lname= result.athlete.lname; $scope.athlete.gender= result.athlete.gender; .... }); This gets annoying very quickly. With the first block of code it's as if angular does not know that my $scope.athlete variable has been updated. This function is triggered from an ng-click, not some jquery call, I am doing it the angular way as far as I know. here is a simpler case I made: http://plnkr.co/edit/lMCPbzqDOoa5K4GXGhCp

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• how to guarantee atomicity across two databases (the filesystem and your RDBMS)?

  - by Lock up

  i am working on a online file management project.In which we are storing references on the database(sql server) and files data on the on file system;.In which we are facing a problem of coordination between file system and database while we are uploading a file and also in case of deleting a file that first we create a reference in the data base or store files on file system;;the problem is that if create a reference in the database first and then storing a file on file system.bur while storing files on the file system any type of error occur.then reference for that file is created in the database but no file data on the file system;; please give me some solution how to deal with such situation;;i am badly in need of it;; and reason for that?

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• Substring in excel

  - by Celops

  I have a set of data that shown below on excel. R/V(208,0,32) YR/V(255,156,0) Y/V(255,217,0) R/S(184,28,16) YR/S(216,128,0) Y/S(209,171,0) R/B(255,88,80) YR/B(255,168,40) Y/B(255,216,40) And I want to separate the data in each cell look like this. R/V 208 0 32 R/S 184 28 16 R/B 255 88 80 what is the function in excel that I can use for this case. Thank you in advance.

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• class member access specifiers

  - by pdehaan

  I understand what the typical access specifiers are, and what they mean. 'public' members are accessible anywhere, 'private' members are accessible only by the same class and friends, etc. What I'm wondering is what, if anything, this equates to in lower-level terms. Are their any post-compilation functional differences between these beyond the high-level restrictions (what can access what) imposed by the language (c++ in this case) they're used in. Another way to put it - if this were a perfect world where programmers always made good choices (like not accessing members that may change later and using only well defined members that should stay the same between implementations), would their be any reason to use these things?

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