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  • Multithreaded ActiveRecord requests in rspec

    - by jeem
    I'm trying to recreate a race condition in a test, so I can try out some solutions. I find that in the threads I create in my test, ActiveRecord always returns 0 for counts and nil for finds. For example, with 3 rows in the table "foos": it "whatever" do puts Foo.count 5.times do Thread.new do puts Foo.count end end end will print 3 0 0 0 0 0 test.log shows the expected query, the expected 6 times: SELECT count(*) AS count_all FROM `active_agents` Any idea what's going on here?

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  • ASP.NET MVC - Typesafe Html.TextBoxFor with different outputmodel

    - by BjartN
    My view uses ModelX to render my HTML form and my controller action takes ModelY as input when saving the form. It seems the typesafe textbox API assumes I am using the same model in both places. Is it possible to use different models and beeing type safe without creating my own helpers ? <% = Html.TextBoxFor(x => x.Text) %> I would like something like this. Does it exist ? <% = Html.TextBoxFor<InputModel,OutputModel>(input=>input.Text, output=>output.SomeOtherText)

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  • Capture variable assignments in a Perl eval

    - by Bruce
    I would like to be able to capture variable assignments from a Perl eval. That is, to determine what variable names have been assigned to within the code and extract their value. For example if I run: eval '$foo=42; $bar=3.14;' The result of the eval is 3.14 (the last value evaluated), but I would also like to be able to determine the names "$foo" and "$bar" and their values (without knowing the names in advance). I have read up on a couple of ways of inserting variables into the eval block, through Safe and Eval::Context, but not yet any way of extracting them. I am more familiar with Python's eval/exec which have built in support for this.

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  • iPhone dev: Get keys (public / private)

    - by Jonny
    I'm using another computer than normal to do iPhone dev. Now I'm trying to get my apps onto my iPhone, but fail with the certificates, keys and stuff. Refer to this thread: http://stackoverflow.com/questions/613719/iphone-provisioning-problem-public-private-key Actually I'm able to download my cert no problem from Apple's site, but how would I get at the keys needed? (private, public), I see no way of getting them...

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  • reading txt storing in different

    - by dev2
    ASp.NET application. In button click i am accessing one text file and reading content and storing in other destination. while both users clicking this button at a time deadlock(thread is being used by other process) will occurs so how to handle this i want to read each user one by one can any one suggest method to handle. i am looking to handle with waithandle events so can any one give a code sample for above scenario.

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  • Void pointer cast C++ and GTK

    - by Tarantula
    See this GTK callback function: static gboolean callback(GtkWidget *widget, GdkEventButton *event, gpointer *data) { AnyClass *obj = (AnyClass*) data; // using obj works } (please note the gpointer* on the data). And then the signal is connected using: AnyClass *obj2 = new AnyClass(); gtk_signal_connect(/*GTK params (...)*/, callback, obj2); See that the *AnyClass is going to be cast to gpointer* (void**). In fact, this is working now. The callback prototype in GTK documentation is "gpointer data" and not "gpointer *data" as shown in code, what I want to know is: how this can work ? Is this safe ?

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  • AtomicInteger for limited sequnce generation

    - by satish
    How can we use AtomicInteger for limited sequence generation say the sequence number has to be between 1 to 60. Once the sequece reaches 60 it has to start again from 1. I wrote this code though not quite sure wether this is thread safe or not? public int getNextValue() { int v; do { v = val.get(); if ( v == 60) { val.set(1); } } while (!val.compareAndSet(v , v + 1)); return v + 1; }

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  • how to cancel an awaiting task c#

    - by user1748906
    I am trying to cancel a task awaiting for network IO using CancellationTokenSource, but I have to wait until TcpClient connects: try { while (true) { token.Token.ThrowIfCancellationRequested(); Thread.Sleep(int.MaxValue); //simulating a TcpListener waiting for request } } any ideas ? Secondly, is it OK to start each client in a separate task ?

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  • Firewall configuration. (Windows server 2008)

    - by Jon
    Hello. I'm having a little problem with configuring the firewall on my server. I only want a specific range of IPs to be able to access specific ports. For example, I'm having alot of password attempts to some of my servers, so I want to make it more safe by only allowing incoming connections from a specific range of domain. Example: My IP is usually adsl-324-4.somecompany.com so I want to allow *.somecpompany.com to connect, as my IP is dynamic. That would get rid of alot of attempts to hack into my servers. But I have no idea how to mask a domain like that for the firewall. How could I for example allow all incoming connections from *.is? Thanks.

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  • this pointer to base class constructor?

    - by Rolle
    I want to implement a derived class that should also implement an interface, that have a function that the base class can call. The following gives a warning as it is not safe to pass a this pointer to the base class constructor: struct IInterface { void FuncToCall() = 0; }; struct Base { Base(IInterface* inter) { m_inter = inter; } void SomeFunc() { inter->FuncToCall(); } IInterface* m_inter; }; struct Derived : Base, IInterface { Derived() : Base(this) {} FuncToCall() {} }; What is the best way around this? I need to supply the interface as an argument to the base constructor, as it is not always the dervied class that is the interface; sometimes it may be a totally different class. I could add a function to the base class, SetInterface(IInterface* inter), but I would like to avoid that.

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  • Updating table from async task android

    - by CantChooseUsernames
    I'm following this tutorial: http://huuah.com/android-progress-bar-and-thread-updating/ to learn how to make progress bars. I'm trying to show the progress bar on top of my activity and have it update the activity's table view in the background. So I created an async task for the dialog that takes a callback: package com.lib.bookworm; import android.app.ProgressDialog; import android.content.Context; import android.os.AsyncTask; public class UIThreadProgress extends AsyncTask<Void, Void, Void> { private UIThreadCallback callback = null; private ProgressDialog dialog = null; private int maxValue = 100, incAmount = 1; private Context context = null; public UIThreadProgress(Context context, UIThreadCallback callback) { this.context = context; this.callback = callback; } @Override protected Void doInBackground(Void... args) { while(this.callback.condition()) { this.callback.run(); this.publishProgress(); } return null; } @Override protected void onProgressUpdate(Void... values) { super.onProgressUpdate(values); dialog.incrementProgressBy(incAmount); }; @Override protected void onPreExecute() { super.onPreExecute(); dialog = new ProgressDialog(context); dialog.setCancelable(true); dialog.setMessage("Loading..."); dialog.setProgress(0); dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); dialog.setMax(maxValue); dialog.show(); } @Override protected void onPostExecute(Void result) { super.onPostExecute(result); if (this.dialog.isShowing()) { this.dialog.dismiss(); } this.callback.onThreadFinish(); } } And in my activity, I do: final String page = htmlPage.substring(start, end).trim(); //Create new instance of the AsyncTask.. new UIThreadProgress(this, new UIThreadCallback() { @Override public void run() { row_id = makeTableRow(row_id, layout, params, matcher); //ADD a row to the table layout. } @Override public void onThreadFinish() { System.out.println("FINISHED!!"); } @Override public boolean condition() { return matcher.find(); } }).execute(); So the above creates an async task to run to update a table layout activity while showing the progress bar that displays how much work has been done.. However, I get an error saying that only the thread that started the activity can update its views. I tried doing: MainActivity.this.runOnUiThread(new Runnable() { @Override public void run() { row_id = makeTableRow(row_id, layout, params, matcher); //ADD a row to the table layout. } } But this gives me synchronization errors.. Any ideas how I can display progress and at the same time update my table in the background? Currently my UI looks like:

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  • Is keeping uploads folder outside of 'public_html' enough to keep my application secure from malicio

    - by ecu
    Although I realise there are different approaches to securing upload process, I'm still confused when it comes to basic principles. I want to allow users to upload any kind of file they want, but keep my app secure. So my question is: Is it sufficient to store the files with their original names in 'uploads' folder outside 'webroot' and fetching them via some download.php script? If it't not secure enough, please point me in the right direction, or suggest what additional steps I should take to make it safe. Thank you.

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  • "Remember" last three MySql queries; Cookie, passed variable or other method?

    - by Camran
    I have a classified website, with pretty sophisticated searching, and I am about to implement a function where the last three queries is displayed for the user, so that the user can go back easier through the queries. This because for each query the user has to provide a lot of input. I have four questions for you: I wonder, how can I save the actual query (SELECT * FROM etc etc)...? Do I need to add some form of encryption to be on the safe side? How will this affect performance? (I don't like the fact that cookies slow websites down) Anything else to think about? If you need more input, let me know... Btw, the website is PHP based. Thanks

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  • do you need captcha validation in newsletter subscription?

    - by user354051
    I am using a custom captcha php script along with news letter scripts to let users subscribe using an email id. The method of registration is based on jQuery.post command. My question is that am I really safe If I remove the captcha validation from my subscription script. The subscription is simple. For example mydomain/[email protected] The subscribe.php is called along with email as parameter using jQuery.post command. I am new to web programming stuff and don't have much idea about spammers in conjunction with above scenario. Any advise would greatly be appreciated. Thanks

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  • Multi-Dimensional Array and ArrayIndexOutOfBoundsException

    - by notset
    Hello, I have a strange problem which I can't fix: A field: private boolean[][][] gaps; Constructor (1st line): gaps = new boolean[NOBARRICADES][WIDTH][HEIGHT]; Constructor (2nd line): for (int i = 0; i < NOBARRICADES; i++) { JAVA throws an error for the 2nd line, saying: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException Does it have anything to do with JAVA syntax (the mistake is in these lines of code) or I should look for the problem somewhere else?

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  • Android segmented downloading

    - by xRev
    I'm still new to Android, so, I'm still not so familiar with its libraries and APIs. My first major project is a download manager which supports segmented downloading. I could already download files, but, I still have no idea on how or where to start for segmented downloading. I have already browsed a lot of threads, but I really couldn't find any article or thread about segmented downloading in Android. Can anyone please help me?

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  • Initialise a wix CheckBox's check state based on a property?

    - by MauriceL
    How does one initalise a Wix check box based on the value of a property? So far, I've done the following: <Control Id="Checkbox" Type="CheckBox" X="0" Y="0" Width="100" Height="15" Property="CHECKBOX_SELECTION" Text="I want this feature" CheckBoxValue="1" TabSkip="no"> <Condition Action="hide">HIDE_CHECKBOX</Condition> <Condition Action="show">NOT HIDE_CHECKBOX</Condition> </Control> Currently I have two custom actions to set HIDE_CHECKBOX and CHECKBOX_SELECTION. The CHECKBOX_SELECTION custom action occurs immediately after the HIDE_CHECKBOX action. What I'm seeing is that HIDE_CHECKBOX is behaving correctly (ie. the checkbox is hidden) which suggests that I've got the ordering of custom actions correct, but CHECKBOX_SELECTION is not changing the check state of the check box. Is this a safe assumption? Also, I've confirmed that SELECTION is being set to '1' in the logs.

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  • [C++] which is better, throw an exception or return nonzero value?

    - by xis19
    While you are doing C++ programming, you have two choices of reporting an error. I suppose many teachers would suggest you throw an exception, which is derived from std::exception. Another way, which might be more "C" style, is to return a non-zero value, as zero is "ERROR_SUCCESS". Definitively, return an exception can provide much more information of the error and recovery; while the code will bloat a little bit, and making exception-safe in your mind is a little difficult for me, at least. Other way like returning something else, will make reporting an error much easier; the defect is that managing recovery will be a possibly big problem. So folks, as good programmers, which would be your preference, not considering your boss' opinion? For me, I would like to return some nonzero values.

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  • C++: Print only one char

    - by Martijn Courteaux
    Hi, When I read one char* from std::cin and I want to write it to std::cout, it prints until it finds a \0 in memory. So what did was: char c; cin >> c; char* pChar = &c; pChar++; *pChar = '\0'; println(&c); // My own method: void println(char * str) { cout << str << endl; } But I don't think this is a safe action. Is there a safer way to do this?

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  • Form POST or sessions?

    - by eddienotizzard
    If you have an item where you allow users to add comments, how can you pass which item the user is replying too? I've though of using a hidden field in a form, however this can be easily changed using plugins such as firebug: <form method="post" action="blah"> <input type="hidden" name="item_id" value="<?php echo $item_id; ?>"> <!-- other form data here --> <input type="submit" name="submit"> </form> Or just simply using a session: $_SESSION['item_id'] = $item_id Is there a safe way to send the item data in a form?

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  • Implement "tail -f" in C++

    - by Hamming
    Hi! I want to create a small code in C++ with the same functionality as "tail-f": watch for new lines in a text file and show them in the standard output. The idea is to have a thread that monitors the file Is there an easy way to do it without opening and closing the file each time?

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  • Benchmarks for Single and MultiThreaded programs

    - by user280848
    Hi I am trying to compare the performance of Single and Multithreaded Java programs. Are there any single thread benchmarks which are available which I could then use and convert to their multithreaded version and compare the performance. Could anybody guide me as to what kind of programs(not very small) are suitable for this empirical comparison. Thanks in advance

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  • Are parallel calls to send/recv on the same socket valid?

    - by Jay
    Can we call send from one thread and recv from another on the same socket? Can we call multiple sends parallely from different threads on the same socket? I know that a good design should avoid this, but I am not clear how these system APIs will behave. I am unable to find a good documentation also for the same. Any pointers in the direction will be helpful.

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  • C# dispatcher problem

    - by Bert
    Hi, In the constructor of an object i need to create a WPF mediaElement object: m_videoMedia = new MediaElement(); but the class can also be instantiated from a other thread so i need to use Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() => { m_videoMedia = new MediaElement(); })); But how can I get the right dispatcher instance in that constructor :s

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