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  • performance monitoring tools for multi-tenant web application

    - by Anton
    We have a need to monitor performance of our java web app. We are looking for some tolls which can help us with this task. The major difficulty is that we are SaaS provider with multi-tenant server architecture with hundreds of customers running on the same hardware. So far we tried commercial products like DynaTrace and Coradinat but unfortunately they don't get the job done so far. What we need is a simple report which would tell us if we had performance problems on each customer site in a specified period of time. Mostly it will be response time per customer but also we will need some more specifics based on the URLs. please let me know if someone had any experience with setting up such monitoring. Thanks!

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  • Correct way to generate order numbers in SQL Server

    - by Anton Gogolev
    This question certainly applies to a much broader scope, but here it is. I have a basic ecommerce app, where users can, naturally enough, place orders. Said orders need to have a unique number, which I'm trying to generate right now. Each order is Vendor-specific. Basically, I have an OrderNumberInfo (VendorID, OrderNumber) table. Now whenever a customer places an order I need to increment OrderNumber for a particuar Vendor and return that value. Naturally, I don't want other processes to interfere with me, so I need to exclusively lock this row somehow: begin tranaction declare @n int select @n = OrderNumber from OrderNumberInfo where VendorID = @vendorID update OrderNumberInfo set OrderNumber = @n + 1 where OrderNumber = @n and VendorID = @vendorID commit transaction Now, I've read about select ... with (updlock rowlock), pessimistic locking, etc., but just cannot fit all this in a coherent picture: How do these hints play with SQL Server 2008s' snapshot isolation? Do they perform row-level, page-level or even table-level locks? How does this tolerate multiple users trying to generate numbers for a single Vendor? What isolation levels are appropriate here? And generally - what is the way to do such things?

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  • Model-binding an object from the repository by several keys

    - by Anton
    Suppose the following route: {region}/{storehouse}/{controller}/{action} These two parameters region and storehouse altogether identify a single entity - a Storehouse. Thus, a bunch of controllers are being called in the context of some storehouse. And I'd like to write actions like this: public ActionResult SomeAction(Storehouse storehouse, ...) Here I can read your thoughts: "Write custom model binder, man". I do. However, the question is How to avoid magic strings within custom model binder? Here is my current code: public class StorehouseModelBinder : IModelBinder { readonly IStorehouseRepository repository; public StorehouseModelBinder(IStorehouseRepository repository) { this.repository = repository; } public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { var region = bindingContext.ValueProvider.GetValue("region").AttemptedValue; var storehouse = bindingContext.ValueProvider.GetValue("storehouse").AttemptedValue; return repository.GetByKey(region, storehouse); } } If there was a single key, bindingContext.ModelName could be used... Probably, there is another way to supply all the actions with a Storehouse object, i.e. declaring it as a property of the controller and populating it in the Controller.Initialize.

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  • Using inheritance in PostgreSQL

    - by Anton Prokofiev
    Hello, All! Is somebody have an experience using inheritance in PostgreSQL? Is it worth to use it, or better to keep hands of :)? In which situation you would use it? To be true I'm a little bit in doubt about mixing relational and OO models...

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  • jquery event get array of objects

    - by Anton
    I have few nested DIV elements. For example: <div id='id1'><div id='id2'>content</div></div> I attach event to DIVs event handler using jQuery: $('div').click(function () { //some code }); There will be two events when user click on content. So there will be two simultaneous events. Is it possible to get inside event handler array of objects (DIVs) what have click event? May be it is possible using other framework but jQuery?

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  • How to load entities into readonly collections using the entity framework

    - by Anton P
    I have a POCO domain model which is wired up to the entity framework using the new ObjectContext class. public class Product { private ICollection<Photo> _photos; public Product() { _photos = new Collection<Photo>(); } public int Id { get; set; } public string Name { get; set; } public virtual IEnumerable<Photo> Photos { get { return _photos; } } public void AddPhoto(Photo photo) { //Some biz logic //... _photos.Add(photo); } } In the above example i have set the Photos collection type to IEnumerable as this will make it read only. The only way to add/remove photos is through the public methods. The problem with this is that the Entity Framework cannot load the Photo entities into the IEnumerable collection as it's not of type ICollection. By changing the type to ICollection will allow callers to call the Add mentod on the collection itself which is not good. What are my options?

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  • A problem with assertRaises function in Python

    - by anton.k.
    Hello,guys! I am trying to run the following test self.assertRaises(Exception,lambda: unit_test.testBasic()) where test.testBasic() is class IsPrimeTest(unittest.TestCase): def assertRaises(self,exception,callable,*args,**kwargs): print('dfdf') temp = callable super().assertRaises(exception,temp,*args,**kwargs) def testBasic_helper(self): self.failIf(is_prime(2)) self.assertTrue(is_prime(1)) where prime is a function,and but in self.assertRaises(Exception,lambda: unit_test.testBasic()) the lambda function doesnt throws an exception after the test def testBasic_helper(self): self.failIf(is_prime(2)) self.assertTrue(is_prime(1)) fails Can somebody offers a solution to the problem?

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  • Jqury parent element inner HTML

    - by Anton
    I am getting inner HTML of elrment by next way: $(this).context.innerHTML Then I am getting parent inner HTML: $(this).parent().context.innerHTML But this code returns same values. Any ideas what is wrong?

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  • jQuery fancybox how to call it in my own DIV?

    - by Anton
    Hi I want to display the fancybox in my own <div> because I need another position for the output. The fancy JS is creating a <div> structure in my HTML wich i cant manipulate over CSS. This structure I want only display in <div id="xyz"> for example. Please help?

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  • Usage Rails 3.0 beta 3 without ActiveRecord ORM

    - by Anton
    Hi everybody! Just installed Rails 3.0 beta 3 in Windows 7. And started playing with some easy examples class SignupController < ApplicationController def index @user = User.new(params[:user]) if method.post? and @user.save redirect_to :root end end end class User def initialize(params = {}) @email = params[:email] @passw = params[:password] end def save end end <div align="center"> <% form_for :user do |form| %> <%= form.label :email %> <%= form.text_field :email %><br /> <%= form.label :password %> <%= form.text_field :password %><br /> <%= form.submit :Register! %> <% end %> </div> When I go to /signup I'm getting this error ArgumentError in SignupController#index wrong number of arguments(0 for 1) Is there a problem with constructor or what's wrong?Please, need your help!

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  • c++ Using const in a copy constructor?

    - by Anton
    I have never written copy constructor, so in order to avoid pain i wanted to know if what i have coded is legit. It compiles but i am not sure that it works as a copy constructor should. Also do i have to use const in the copy constructor or i can simply drop it. (What i dont like about const is that the compiler cries if i use some non const functions). //EditNode.h class EditNode { explicit EditNode(QString elementName); EditNode(const EditNode &src); } //EditNodeContainer.h class EditNodeContainer : public EditNode { explicit EditNodeContainer(QString elementName); EditNodeContainer(const EditNodeContainer &src); } //EditNodeContainer.cpp EditNodeContainer::EditNodeContainer(QString elementName):EditNode(elementName) { } //This seems to compile but not sure if it works EditNodeContainer::EditNodeContainer(const EditNodeContainer &src):EditNode(src) { } //the idea whould be to do something like this EditNodeContainer *container1 = new EditNodeContainer("c1"); EditNodeContainer *copyContainer = new EditNodeContainer(container1);

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  • Rails development environment Resque.enqueue does not create jobs

    - by anton evangelatov
    I am having the same problem like Rails custom environment Resque.enqueue does not create jobs , but the solution there doesn't work for me. I'm using Resque for a couple of asynchronous jobs. It works just fine for the staging environment, but for some reason it stopped working on development environment. For example, if I run the following: $ rails c development > Resque.enqueue(MyLovelyJob, 1) Nothing is enqueued. I check Resque using resque-web If I run it on staging - it works just fine. $ rails c staging > Resque.enqueue(MyLovelyJob, 1) I have tried to duplicate the 2 environment, and they seem to use absolutely the same configurations (database.yml , config/environment , etc.), but development is still not working. If I do > Resque.enqueue(UpdateInstancesData, 2) > => true > Resque.info > => { > :pending => 0, > :processed => 0, > :queues => 0, > :workers => 1, > :working => 0, > :failed => 0, > :servers => [ > [0] "redis://127.0.0.1:6379/0" > ], > :environment => "development" > } Any suggestions where to look in order to debug this? I am running the application via foreman. My Procfile looks like: faye: rackup faye.ru -s thin -E production worker1: bundle exec rake resque:work QUEUE=* VERBOSE=1 worker2: bundle exec rake resque:work QUEUE=* VERBOSE=1 clock: bundle exec rake resque:scheduler VERBOSE=1 web: bundle exec rails s For staging, as mentioned, everything works and the log from foreman is: 17:03:42 clock.1 | 2013-06-26 17:03:42 Reloading Schedule 17:03:42 clock.1 | 2013-06-26 17:03:42 Loading Schedule 17:03:42 clock.1 | 2013-06-26 17:03:42 Scheduling logging_test 17:03:42 clock.1 | 2013-06-26 17:03:42 Schedules Loaded 17:03:43 worker2.1 | *** Starting worker ttttt-mbp.local:69573:* 17:03:43 worker2.1 | *** Registered signals 17:03:43 worker2.1 | *** Running before_first_fork hooks 17:03:43 worker1.1 | *** Starting worker ttttt-mbp.local:69572:* 17:03:43 worker1.1 | *** Registered signals 17:03:43 worker2.1 | *** Checking another_queue 17:03:43 worker2.1 | *** Checking anotherqueue 17:03:43 worker2.1 | *** Checking statused 17:03:43 worker2.1 | *** Found job on statused 17:03:43 worker2.1 | *** got: (Job{statused} | LoggingTest | ["57e89a1c1b24ce6866bcf5d0e1c07f01", {}]) 17:06:30 clock.1 | 2013-06-26 17:06:30 queueing LoggingTest (logging_test) 17:06:33 worker1.1 | *** Checking another_queue 17:06:33 worker2.1 | *** Checking another_queue 17:06:33 worker1.1 | *** Checking anotherqueue 17:06:33 worker2.1 | *** Checking anotherqueue 17:06:33 worker1.1 | *** Found job on anotherqueue 17:06:33 worker1.1 | *** got: (Job{anotherqueue} | LoggingTest | ["0d976869a945766e0cfeca83e7349305", {}]) 17:06:33 worker1.1 | *** resque-1.24.1: Processing anotherqueue since 1372259193 [LoggingTest] 17:06:33 worker1.1 | *** Running before_fork hooks with [(Job{anotherqueue} | LoggingTest | ["0d976869a945766e0cfeca83e7349305", {}])] 17:06:33 worker1.1 | *** resque-1.24.1: Forked 69955 at 1372259193 17:06:33 worker2.1 | *** resque-1.24.1: Forked 69956 at 1372259193 17:06:33 worker1.1 | *** Running after_fork hooks with [(Job{anotherqueue} | LoggingTest | ["0d976869a945766e0cfeca83e7349305", {}])] 17:06:33 worker1.1 | JOB :: LoggingTest 17:06:33 worker1.1 | 55555 17:06:33 worker1.1 | *** done: (Job{anotherqueue} | LoggingTest | ["0d976869a945766e0cfeca83e7349305", {}]) whereas for development it doesn't seem to enqueue and then find the job. If there is a job already in the queue (pending, left over from staging environment) the workers from development don't process it. 17:01:23 clock.1 | 2013-06-26 17:01:23 Reloading Schedule 17:01:23 clock.1 | 2013-06-26 17:01:23 Loading Schedule 17:01:23 clock.1 | 2013-06-26 17:01:23 Scheduling logging_test 17:01:23 clock.1 | 2013-06-26 17:01:23 Scheduling update_instances_data 17:01:23 clock.1 | 2013-06-26 17:01:23 Schedules Loaded 17:03:10 clock.1 | 2013-06-26 17:03:10 queueing LoggingTest (logging_test) 17:03:14 worker1.1 | *** Checking another_queue 17:03:14 worker2.1 | *** Checking another_queue 17:03:14 worker1.1 | *** Checking anotherqueue 17:03:14 worker2.1 | *** Checking anotherqueue 17:03:14 worker1.1 | *** Checking statused 17:03:14 worker2.1 | *** Checking statused

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  • Reverse regular expressions to generate data

    - by Anton Gogolev
    In one of the StackOverflow Podcasts (the one where guys were discussing data generation for testing DBs -- either #11 or #12), Jeff mentioned something like "reverse regular expressions", which are used exactly for that purpose: given a regex, produce a string which will eventually match said regex. What is the correct term for this whole concept? Is this a well-known concept?

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  • Jquery child elements

    - by Anton
    When I add event handler to a some elements using query: $('div').mouseover(function () { }); how can I check inside this function next: Have this "DIV"child elements "DIV"? Have this "DIV" child element "DIV" whith height more than 300?

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  • MySQL break out group clause from subquery

    - by Anton Gildebrand
    Here is my query SELECT COALESCE(js.name,'Lead saknas'), count(j.id) FROM jobs j LEFT JOIN job_sources js ON j.job_source=js.id LEFT JOIN (SELECT * FROM quotes GROUP BY job_id) q ON j.id=q.job_id GROUP BY j.job_source The problem is that it's allowed for each job to have more than one quote. Because of that i group the quotes by job_id. Now sure, this works. But i don't like the solution with a subquery. How can i break out the group clause from the subquery to the main query? I have tried to add q.job_id to the main group clause, both before and after the existing one but don't get the same results.

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  • List View Selected Index Changed in a multi-selectable list view

    - by Anton Indrawan
    I have a windows form with a listview control. I set the MultiSelect property to true and I added a selected_index changed event. I get the event fired when I click the same index as the current selected index. My expectation is that I will not get the event fired. The strange thing is that the event fired 1 second after I click the index. I appreciate for any reply to explain why this is happening.

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  • Map derived class as an independent one with FNH's Automap

    - by Anton Gogolev
    Hi! Basically, I have an ImageMetadata class and an Image class, which derives from ImageMetadata. Image adds one property: byte[] Content, which actually contains binary data. What I want to do is to map these two classes onto one table, but I absolutely do not need NHibernates' inheritance support to kick in. I want to tailor FNH Automap to produce something like: <class name="ImageMetadata" ...> <property name="Name" ... /> < ... /> <class name="Image" ...> <property name="Name" ... /> <property name="Content" ... /> < ... /> Is this at all possible?

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  • Is there a flat-file database that is supported by Silverlight?

    - by Anton Kanevsky
    I am looking for a flat-file (or serverless) database that I can connect to a C# Silverlight application. There has to be one, but I can't find anything. EDIT: SQLite is an example of a flat-file database. A flat-file database in my view is any database that does not require a server. Unfortunately, SQLite does not work with Silverlight. What I want to achieve is to be able to store, update and delete entries from the database. In my application, there is a chart with sectors and nodes. I want to be able to edit sectors and store their settings in the database, and I want to be able to add/retrieve/edit/delete nodes on the chart. The database needs to be free for educational purposes. Thanks.

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  • PHP Captcha without session

    - by Anton N
    Ok, here is an issue: in the project i'm working on, we can't rely on server-side sessions for any functionality. The problem is that common captcha solutions from preventing robotic submits require session to store the string to match captcha against. The question is - is there any way to solve the problem without using sessions? What comes to my mind - is serving hidden form field, containing some hash, along with captcha input field, so that server then can match these two values together. But how can we make this method secure, so that it couldn't be used to break captcha easily.

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  • sequential minimal optimization C++

    - by Anton
    Hello. I want to implement the method of SVM. But the problem appeared in his training. It was originally planned to use SMO, but did not find ready-made libraries for C++. If there is a ready, then share it. Thank you in advance. The problem of finding an object in the picture (probably human)

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