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  • Java - Handling Non-Blocking Calls

    - by sarav
    In my application I am using a third-party API. It is a non-blocking method which returns immediately. I have a collection of elements over which I have to invoke this method. Now, my problem is that I have to find a way till all the method execution gets completed and do my next operation. How can I handle this? I cannot modify the third-party API. In short it looks like this for(Object object: objects){ methodA(object); //this is a non-blocking call and returns immediately } // here I want to do my next task only after all the methodA calls completed execution

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  • Why baseclass calls method of subclass?

    - by twlkyao
    I encounter some code like the following: BaseClass: public class BaseClass { String name = "Base"; public BaseClass() { printName(); } public void printName() { System.out.println(name + "——Base"); } } DrivedClass: public class SubClass extends BaseClass { String name = "Sub"; public SubClass() { printName(); } public void printName() { System.out.println(name + "——Sub"); } public static void main(String[] args) { new SubClass(); } } When run the code, the output is: null——Sub Sub——Sub while it should be: Base——Base Sub——Sub I wonder why the BaseClass constructor calls the SubClass method, can anybody explain this? Thanks in advance.

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  • Problems with system() calls in Linux

    - by Thomas
    I'm working on a init for an initramfs in C++ for Linux. This script is used to unlock the DM-Crypt w/ LUKS encrypted drive, and set the LVM drives to be available. Since I don't want to have to reimplement the functionality of cryptsetup and gpg I am using system calls to call the executables. Using a system call to call gpg works fine if I have the system fully brought up already (I already have a bash script based initramfs that works fine in bringing it up, and I use grub to edit the command line to bring it up using the old initramfs). However, in the initramfs it never even acts like it gets called. Even commands like system("echo BLAH"); fail. So, does anyone have any input?

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  • multiple regionDidChangeAnimated calls - what gives?

    - by mvexel
    I have a MKMapView inside a UITableView as a custom cell (don't ask ;) - don't know if it matters really), for which I register a regionDidChangeAnimated delegate method. This method gets called three times when the UITableView is loaded - once with the actual region and then two more times with a region that is way off. In the simulator, I consistently get a region with center (+37.43997405, -97.03125000). On the device, it seems to depend on the location reported by the location manager, which initializes the map view. Why am I getting three regionDidChangeAnimated calls? And why are the center coordinates for the last two of them off? This is the code I use to get the center coordinates: - (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated { CLLocation *l = [[CLLocation alloc] initWithLatitude:self.mapView.centerCoordinate.latitude longitude:self.mapView.centerCoordinate.longitude]; (....)

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  • Minimizing calls to database in rails

    - by ming yeow
    Hi guys, i am familiar with memcached and eager loading, but neither seems to solve the problem i am facing. My main performance lag comes from hundreds of data retrieval calls from the database. The tricky thing is that I do not know which set of users i need to retrieve until i have several steps of computation. I can refactor my code, but i was wondering how you experts handle this situation? I think it should be a fairly common situation def newsfeed - find out which users i need - retrieve those users via DB - find out which events happened for these users - for each of those events - retrieve new set of users - find out which groups are relevant - for each of those groups - retrieve new set of users - etc, etc end

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  • Changing CCK content-types details results in numerous DB calls for the menu system

    - by Paul Strugger
    Every time I make a change in the details of a content-type it takes too long. I though it had to do with the fact that I had too many content-types and fields (~500), but when I load the devel module to see the queries that take that long I see: Executed 32212 queries in 12267.57 milliseconds. Queries taking longer than 5 ms and queries executed more than once, are highlighted. Page execution time was 55763.32 ms When I see the details I notice that the vast majority of db calls come from the menu system, e.g.: _menu_route menu_local_tasks admin_menu_link_save Why is that? Can I avoid some of these? It doesn't seem logical!

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  • Add Firefox’s Awesome Bar Bookmark Search Function to Chrome and Iron

    - by Asian Angel
    Do you have a large number of bookmarks saved in your Chromium-based browser and need a quick way to search through them? Then see how easy it is to search through those bookmarks just like Firefox users do with the AwesomeBar extension. To engage the bookmark search function type “ab” in the Address Bar as seen above and press either Tab or the Space Bar. That will display the AwesomeBar prefix-bar as seen below. Enter the desired text to begin your search. For our example we decided to conduct a search for bookmarks related to the Ubuntu Twitter client Hotot. The results will continue to narrow down nicely as you type… Typing just a bit more finishes narrowing our search down the rest of the way for Hotot related items. Install the AwesomeBar Extension [Google Chrome Extensions] How to Enable Google Chrome’s Secret Gold IconHow to Create an Easy Pixel Art Avatar in Photoshop or GIMPInternet Explorer 9 Released: Here’s What You Need To Know

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  • Keyboard Function Keys Do Not Work

    - by Anthony Burman
    I use the Microsoft Natural MultiMedia Keyboard 1.0A. The keyboard is not a wireless board. The Escape button and the function keys have never worked. I am currently running on 10.10. On previous incarnations the keys never worked either. However a recent journey through all the Microsoft options in System Preference Keyboard Layouts suggested that the Escape button could be functional. The current setting is Generic 105-key (Intl) PC. Can I find out whether the keys can be made to work or not? Of the top buttons, nothing happens when I press My Documents; a small red cross appears at the top right of the screen when I press My Pictures and the Media, Mail and Web/Home buttons work just fine. Thanks, Anthony.

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  • How to recognize special function keys on keyboard

    - by NikolaiDante
    I have a Microsoft Digital Media 3000 Keyboard. None of the function keys or other special keys seem to do anything, what do I need to do to get them working (at the very least f2, as not having a shortcut to rename a file is driving me mad) If I run xev and press f2 I get the following output in the terminal: KeyPress event, serial 36, synthetic NO, window 0x4800001, root 0x15d, subw 0x0, time 42858728, (674,456), root:(1034,588), state 0x10, keycode 139 (keysym 0xff65, Undo), same_screen YES, XLookupString gives 0 bytes: XmbLookupString gives 0 bytes: XFilterEvent returns: False KeyRelease event, serial 36, synthetic NO, window 0x4800001, root 0x15d, subw 0x0, time 42858912, (674,456), root:(1034,588), state 0x10, keycode 139 (keysym 0xff65, Undo), same_screen YES, XLookupString gives 0 bytes: XFilterEvent returns: False

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  • How to re-enable function keys in byobu?

    - by Yang
    I was using byobu on Ubuntu 11.10 Server and I needed to hit a function key in an app, so I hit F9 to bring up the config menu and switched the keybinding set from "f-keys" to "screen-escape-keys". That worked, but now I can't re-enable all the f-keys. I found a program byobu-config that brings up the menu again, and I can switch back to screen keys from there. This fixes things for new screen processes, but the effect on the current screen session is weird: it disables the ctrl-a (screen) keys and restores F2-F8, but F9-F12 still don't do anything (they're just passed on to the foreground process). What's up with this? Any ideas? Thanks in advance.

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  • ~/.bashrc return can only 'return' from a function or sourced script

    - by Timothy
    I am trying to setup a OpenStack box to have a look at OpenStack Object Storage (Swift). Looking through the web I found this link; http://swift.openstack.org/development_saio.html#loopback-section I followed the instructions line by line but stuck on step 7 in the "Getting the code and setting up test environment" section. When I execute ~/.bashrc I get; line 6: return: can only 'return' from a function or sourced script. Below is the Line 6 extract from ~/.bashrc. My first reaction is to comment this line out, but I dont know what it does. Can anyone help? #If not running interactively, dont't do anything [ -z "$PS1" ] && return I'm running Ubuntu 12.04 as a VM on Hyper-v if knowing that is useful.

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  • Test case as a function or test case as a class

    - by GodMan
    I am having a design problem in test automation:- Requirements - Need to test different servers (using unix console and not GUI) through automation framework. Tests which I'm going to run - Unit, System, Integration Question: While designing a test case, I am thinking that a Test Case should be a part of a test suite (test suite is a class), just as we have in Python's pyunit framework. But, should we keep test cases as functions for a scalable automation framework or should be keep test cases as separate classes(each having their own setup, run and teardown methods) ? From automation perspective, Is the idea of having a test case as a class more scalable, maintainable or as a function?

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  • Can't adjust brightness on Samsung RV420 with fn keys

    - by nicholascamp
    Typing ls /sys/class/backlight/*/brightness outputs /sys/class/backlight/intel_backlight/brightness /sys/class/backlight/samsung/brightness The max_brightness for the second is 8, but changing it with echo 2 | sudo tee /sys/class/backlight/samsung/brightness doesn't change brightness. I can do it by using intel_backlight: echo 2000 | sudo tee /sys/class/backlight/intel_backlight/brightness (max_brightness: cat /sys/class/backlight/intel_backlight/max_brightness outputs 4648). But I want to do this work with the fn brightness keys, as I always did. I don't know what happened to stop working, maybe the use of +1 monitor and removing it in a wrong time or a system update. I'm using Ubuntu 12.04 64 bits in an Samsung RV420 notebook. Kernel Version is 3.2.0-27-generic. Could you help me? Please tell me what more info should I provide. Thanks!

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  • Using DLLEXPORT to export DLL function With Class to C#

    - by SICGames2013
    In my previous revision game engine I deported major functions for the game editor for C#. Now, I'm beginning to revise the game engine with a static library. There's a already dynamic library created in C++ to use DLLEXPORT for C#. Just now I want to test out the newer functions and created a DLL file from C++. Because the DLL contains classes I was wondering how would I be able to use DLL Export. Would I do this: [DLLEXPORT("GameEngine.dll", EntryPoint="SomeClass", Conventional=_stdcall)] static extern void functionFromClass(); I have a feeling it's probably DLLImport and not DLLExport. I was wondering how would I go about this? Another way I was thinking was because I already have the DLL in C++ prepared already to go the C# Class Library. I could just keep the new engine as a lib, and link the lib with the old DLL C++ file. Wouldn't the EntryPoint be able to point to the class the function is in?

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  • Accessing UI elements from delegate function in Windows Phone 7

    - by EpsilonVector
    I have the following scenario: a page with a bunch of UI elements (grids, textblocks, whatever), and a button that when clicked launches an asynchronous network transaction which, when finished, launches a delegate function. I want to reference the page's UI elements from that delegate. Ideally I would like to do something like currentPage.getUIElementByName("uielement").insert(data), or even uielement.insert(data), or something similar. Is there a way to do this? No matter what I try an exception is being thrown saying that I don't have permissions to access that element. Is there a more correct way to handle updating pages with data retrieved over network?

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  • Object-Oriented equivalent of LISP's progn function?

    - by Archer
    I'm currently writing a LISP parser that iterates through some AutoLISP code and does its best to make it a little easier to read (changing prefix notation to infix notation, changing setq assignments to "=" assignments, etc.) for those that aren't used to LISP code/only learned object oriented programming. While writing commands that LISP uses to add to a "library" of LISP commands, I came across the LISP command "progn". The only problem is that it looks like progn is simply executing code in a specific order and sometimes (not usually) assigning the last value to a variable. Am I incorrect in assuming that for translating progn to object-oriented understanding that I can simply forgo the progn function and print the statements that it contains? If not, what would be a good equivalent for progn in an object-oriented language?

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  • Map function+backspace to delete

    - by Espressofa
    I'm used to Apple laptops, on which Function + Backspace is mapped to Delete. I'm also okay with Shift + Backspace. Is there a way to obtain this? Note, I'm using Xmonad and have some keyboard modifications set up with xmodmap but have very little understanding of how it works. I've tried xmodmap -e "keycode 22 = BackSpace KP_Delete BackSpace BackSpace", which works in some applications but is ignored by my terminal. I've seen this question but it seems KDE-specific. I would prefer not to have to use some GUI.

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  • iOS persistant storage with update function

    - by jernej
    im developing a game which has different levels and i need to store all levels and its elements (position, image, sounds,..) into a file/database. The levels will be updated so i need a function that checks online for a update and downloads a database dump and additional files. I was planing to store all the persistent data into a SQLLite database, but not quite sure how to do the update part - to pack the database dump and the files together (in a .zip or with a xml). Can this be done any other way (as secure as possible)? thanks!

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  • Single or multiple return statements in a function [on hold]

    - by Juan Carlos Coto
    When writing a function that can have several different return values, particularly when different branches of code return different values, what is the cleanest or sanest way of returning? Please note the following are really contrived examples meant only to illustrate different styles. Example 1: Single return def my_function(): if some_condition: return_value = 1 elif another_condition: return_value = 2 else: return_value = 3 return return_value Example 2: Multiple returns def my_function(): if some_condition: return 1 elif another_condition: return 2 else: return 3 The second example seems simpler and is perhaps more readable. The first one, however, might describe the overall logic a bit better (the conditions affect the assignment of the value, not whether it's returned or not). Is the second way preferable to the first? Why?

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  • Looking for a non-cryptographic hash function that returns a single character

    - by makerofthings7
    Suppose I have a dictionary of ASCII words stored in uppercase. I also want to save those words into separate files so that the total word count of each file is approximately the same. By simply looking at the word I need to know which file it should be in (if it's there at all). Duplicate words should go into the same file and overwrite the last one. My first attempt at solving this problem is to use .NET's object.GetHashCode() function and .Trim() to get one of the "random" characters that pop up. I asked a similar question here If I only use one character of object.GetHashCode() I would get a hash code character of A..Z or 0..9. However saving the result of GetHashCode to disk is a no-no so I need a substitute. Question: What algorithm (or subset of an algorithm) is appropriate for pigeonholing strings into a single character or range of characters (Like hex 0..F offers 16 chars)? Real world usage: I'll use this answer to modify the Partition key used in Azure Table storage as described here

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  • Function keys and Hot are switched

    - by Brian
    I recently got a new laptop and installed 12.10 on it. I noticed right away that the "hot keys" on the F keys didn't always do what was pictured and also I noticed that the "hot keys" and the function keys were reversed. e.g. to close a window I have to hit alt-fn-F2 instead of just alt-F2. This is pretty annoying because I've been using the same keyboard shortcuts for years and I don't really want to have to re-learn them. I would also like to switch what the hot keys do, for example the F3 key is pictured as increase screen brightness but it really puts the computer to sleep. I would like to change this back to increase the brightness I looked in keyboard shortcuts settings but these options are not in there. I also downloaded gconf-editor but was unable to find where to change the shortcuts on it. (they weren't at apps \ metacity \ keybinding_commands like others described) any help would be greatly appreciated

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  • alt + tab not working properly

    - by Ankit
    alt + tab functionality has suddenly started misbehaving. it's showing only desktop and the current active app instead of all the applications opened. For eg currently, opened applications are firefox and terminal but when i press alt+tab i can see either "desktop + firefox" or "desktop + terminal" depending upon whether the current active application is browser or terminal. I have not installed any update. Please help.

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  • Override a static library's global function

    - by Jason Madux
    Not sure if this question belongs here or on SO, but posting here for now :) I'm trying to override a global function defined in "StaticLib" for my iOS application but the compiler keeps giving me the duplicate symbol error. Relevant code: #import "MyApplication.h" #import "StaticLib.h" NSData* getAllData() { NSLog(@"myGetAllData"); return nil; } @implementation MyApplication ... @end I've looked into Apple's runtime library but that all seems to be class-oriented. Any suggestions or is it just not possible to override global functions from static libraries?

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  • How to Avoid a Busy Loop Inside a Function That Returns the Object That's Being Waited For

    - by Carl Smith
    I have a function which has the same interface as Python's input builtin, but it works in a client-server environment. When it's called, the function, which runs in the server, sends a message to the client, asking it to get some input from the user. The user enters some stuff, or dismisses the prompt, and the result is passed back to the server, which passes it to the function. The function then returns the result. The function must work like Python's input [that's the spec], so it must block until it has the result. This is all working, but it uses a busy loop, which, in practice, could easily be spinning for many minutes. Currently, the function tells the client to get the input, passing an id. The client returns the result with the id. The server puts the result in a dictionary, with the id as the key. The function basically waits for that key to exist. def input(): '''simplified example''' key = unique_key() tell_client_to_get_input(key) while key not in dictionary: pass return dictionary.pop(pin) Using a callback would be the normal way to go, but the input function must block until the result is available, so I can't see how that could work. The spec can't change, as Python will be using the new input function for stuff like help and pdb, which provide their own little REPLs. I have a lot of flexibility in terms of how everything works overall, but just can't budge on the function acting exactly like Python's. Is there any way to return the result as soon as it's available, without the busy loop?

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  • ASP.NET 3.5 Search Function Basic Development Concepts

    Adding a search web form to your ASP.NET website is very helpful for your users when they want to search related content. For example if you are going to display a very large table it would be much more efficient for users to search related content and display it back to the browser. This tutorial will show you how to develop a search function in ASP.NET 3.5 which you can add to your website.... AutoCAD LT? 2011 Trial Try The New AutoCAD LT? And Benefit From Consistent 2D Drafting Focus.

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