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  • How to create a manager class without global variables nor singletons?

    - by Omega
    I would like to implement some kind of manager class in my application. It will be in charge of loading textures, processing them, distributing them etc... At first, I wanted to make a global variable that simply contains an instance of my manager class. I found this question: http://stackoverflow.com/questions/4646577/global-variables-in-java. However, the users there seem to recommend to never use global variables. Fine then, I once heard about Singletons, so I though I could use that instead. I mean, creating just one instance of my manager class sounds good. However, I found this other question: When is Singleton appropriate?, which basically tells me that Singletons are, in most scenarios, some kind of anti-pattern. Now I am a bit lost - what other approach can I take to create my manager class, whose only requirement is to be accessible from anywhere?

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  • how to stop enemies from moving to one point when lots of them are chasing one object [duplicate]

    - by BBgun
    This question already has an answer here: Is there a simple way to stop enemies standing in the same spot? 8 answers i am making a top down game which lots of enemies are chasing one guy. then,enemies would move to one point without any collision,they just overlay each other. so ,is there any simple way to make them feel more real? make them not overlay with each other? ================================= i have tried the solution using boundbox to check collision, but i still very puzzled about what to do with the collision. i have a bad solution.it doesn't work well. my solution in simple: foreach(around_enemy_arr in other) { vector a = normalize(self.positionvector - other.positionvector); self.move_vector = self.move_vector + a; } this can work,but when plenty of enemies come very close to each other,they would shake. i am sooooo confused. please help.

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  • Characteristics, what's the inverse of (x*(x+1))/2? [closed]

    - by Valmond
    In my game you can spend points to upgrade characteristics. Each characteristic has a formula like: A) out = in : for one point spent, one pont gained (you spend 1 point on Force so your force goes from 5 to 6) B) out = last level (starting at 1) : so the first point spent earns you 1 point, the next point spent earns you an additional 2 and so on (+3,+4,+5...) C) The inverse of B) : You need to spend 1 point to earn one, then you need to spend 2 to earn another one and so on. I have already found the formula for calculating the actual level of B when points spent = x : charac = (x*(x+1))/2 But I'd like to know what the "reverse" version of B) (usable for C) is, ie. if I have spent x points, how many have I earned if 1 spent gives 1, 1+2=3 gives 2, 1+2+3=6 gives 3 and so on. I know I can just calculate the numbers but I'd like to have the formula because its neater and so that I can stick it in an excel sheet for example... Thanks! ps. I think I have nailed it down to something like charac = sqrt( x*m +k) but then I'm stuck doing number guessing for k and m and I feel I might be wrong anyway as I get close but never hits the spot.

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  • VMware vSphere cluster design for site redundancy

    - by Stefan Radovanovici
    I have a question about the best design for site redudancy when using vSphere clusters. A bit of background info about our situation first though. We are a medium-sized company with two main offices, located in different countries. Our networks are linked by a Layer2 150Mbps leased line which is currently underused. We have a variety of services running for internal use within the company, some on physycal servers and some on existing vSphere clusters. In our department we also run several services (almost all running under various forms of Linux) like NTP, Syslog, jump servers, monitoring servers and so on. We have now the requirement that those servers need to be redundant within each location (which they are not at the moment) and also site redudant (which they are to some extent, the servers are duplicated in the 2nd location with configurations kept in sync via various methods at the application layer). There is no SAN available for us, at least not something that we can use at the moment. Cost is also an issue. While we do have some budget available for this, we can't afford to buy SANs for both locations for example. I looked at the VSA feature and it seems that this could be something for us but I am unsure how to solve the site-redudancy requirement. At the moment for testing purposes I am setting up in a lab a vSphere 5 with VSA on two ESXi hosts. I am currently using the Essentials Plus kit with VSA license, which allows me to build a VSA cluster on up to 3 hosts, together with a vCenter license to manage them. The hosts each have two dual-port network cards and two 600GB drives, running in Raid1. Hardware-wise this will be enough for us to run the all the services we need as VMs and will provide redundandcy within the site. At the moment I see only two option to have site redundancy: build an identical VSA cluter in the second location and keep the various services sync'ed at application layer (database sync, rsync and so on). simply move one of the hosts from the existing cluster to the second location, basically having the VSA cluster span the 150Mbps link between the sites. I would very much prefer the second option but I am unsure how well it'll work, if it can work at all. Technically it should, we can span the needed VLANs across the leased line and have them available in the second location. The advantage would be that we don't need to worry at all about sync'ing databases and the like. But I have the feeling that the bandwidth will not be enough, I have no way of knowing how much traffic will the VSA cluster generate between the hosts. I realize that this will most likely depend on the individual usage of the VMs but still, I have no idea how VSA replicates data between the ESXi hosts. Are these my only options or can my goals be achieved in some other way ? Is there perhaps a way to have some sort of "cold stand by" cluster in the second location where the VMs would be sync'ed once per night from the main location ? The idea is that in case the first site becomes unavailable, we would be able to bring all those VMs online there. We would be ok with the data being 1 day old. Any answers are appreciated. Best regards, Stefan

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  • [android] How to center buttons on screen horizontally and vertically plus equidistant apart?

    - by marc
    I've been racking my brain (android newbie here, so not hard to do) for awhile trying to figure out how to accomplish this: Desired Layout using a RelativeLayout or something other than AbsoluteLayout which is what this was created with. I'm coming from a Windows programming background where the device adjusts the 'absolute' positioning for you and GUI layout was a non-issue. The first layout works great in the emulator, but doesn't format for my Nexus One or any other screen that differs from the emulator size. I expected this because it's absolutely positioned, but haven't found a solution that will format correctly for different screen sizes. My goal is to have the layout work for different screen sizes and in portrait / landscape. Here's the Code that I'm currently using: [main.xml] <?xml version="1.0" encoding="utf-8"?> <AbsoluteLayout android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android" > <Button android:id="@+id/Button01" android:layout_width="188px" android:layout_height="100px" android:text="A" android:layout_y="50px" android:layout_x="65px" android:textSize="48sp"/> <Button android:id="@+id/Button02" android:layout_width="188px" android:layout_height="100px" android:text="B" android:layout_y="175px" android:layout_x="65px" android:textSize="48sp"/> <Button android:id="@+id/Button03" android:layout_width="188px" android:layout_height="100px" android:text="C" android:layout_y="300px" android:layout_x="65px" android:textSize="48sp"/> </AbsoluteLayout> Using tidbits from other questions here, I came up with this, it’s closer, but not there yet. <?xml version="1.0" encoding="utf-8"?> <TableLayout android:gravity="center" android:id="@+id/widget49" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android" > <Button android:id="@+id/Button01" android:layout_width="0dip" android:layout_weight="1" android:text="A" android:textSize="48sp"/> <Button android:id="@+id/Button02" android:layout_width="0dip" android:layout_weight="1" android:text="B" android:textSize="48sp"/> <Button android:id="@+id/Button03" android:layout_width="0dip" android:layout_weight="1" android:text="C" android:textSize="48sp"/> </TableLayout> Here’s a picture of the TableLayout: Another Attempt Any help / guidance would be greatly appreciated.

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  • Problems using wxWidgets (wxMSW) within multiple DLL instances

    Preface I'm developing VST-plugins which are DLL-based software modules and loaded by VST-supporting host applications. To open a VST-plugin the host applications loads the VST-DLL and calls an appropriate function of the plugin while providing a native window handle, which the plugin can use to draw it's GUI. I managed to port my original VSTGUI code to the wxWidgets-Framework and now all my plugins run under wxMSW and wxMac but I still have problems under wxMSW to find a correct way to open and close the plugins and I am not sure if this is a wxMSW-only issue. Problem If I use any VST-host application I can open and close multiple instances of one of my VST-plugins without any problems. As soon as I open another of my VST-plugins besides my first VST-plugin and then close all instances of my first VST-plugin the application crashes after a short amount of time within the wxEventHandlerr::ProcessEvent function telling me that the wxTheApp object isn't valid any longer during execution of wxTheApp-FilterEvent (see below). So it seems to be that the wxTheApp objects was deleted after closing all instances of the first plugin and is no longer available for the second plugin. bool wxEvtHandler::ProcessEvent(wxEvent& event) { // allow the application to hook into event processing if ( wxTheApp ) { int rc = wxTheApp->FilterEvent(event); if ( rc != -1 ) { wxASSERT_MSG( rc == 1 || rc == 0, _T("unexpected wxApp::FilterEvent return value") ); return rc != 0; } //else: proceed normally } .... } Preconditions 1.) All my VST-plugins a dynamically linked against the C-Runtime and wxWidgets libraries. With regard to the wxWidgets forum this seemed to be the best way to run multiple instances of the software side by side. 2.) The DllMain of each VST-Plugin is defined as follows: // WXW #include "wx/app.h" #include "wx/defs.h" #include "wx/gdicmn.h" #include "wx/image.h" #ifdef __WXMSW__ #include <windows.h> #include "wx/msw/winundef.h" BOOL APIENTRY DllMain ( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: { wxInitialize(); ::wxInitAllImageHandlers(); break; } case DLL_THREAD_ATTACH: break; case DLL_THREAD_DETACH: break; case DLL_PROCESS_DETACH: wxUninitialize(); break; } return TRUE; } #endif // __WXMSW__ class Application : public wxApp {}; IMPLEMENT_APP_NO_MAIN(Application) Question How can I prevent this behavior respectively how can I properly handle the wxTheApp object if I have multiple instances of different VST-plugins (DLL-modules), which are dynamically linked against the C-Runtime and wxWidgets libraries? Best reagards, Steffen

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  • Database design - alternatives for Entity Attribute Value (EAV)

    - by Bob
    Hi, see http://stackoverflow.com/questions/695752/product-table-many-kinds-of-product-each-product-has-many-parameters for similar topic. My question: i want to design a database, that will be used for a production facility of different types of products where each product has its own (number of) parameters. because i want the serial numbers to be in one tabel for overview purposes i have a problem with these different paraeters . One solution could be EAV, but it has its downsides, certainly because we have +- 5 products with every product +- 20.000 serial numbers (records). it looks a bit overkill to me... I just don't know how one could design a database so that you have an attribute in a mastertable that says: 'hey, you could find details of this record in THAT detail-table". 'in a way that you qould easely query the results) currenty i am using Visual Basic & Acces 2007. but i'm going to Visual Basic & MySQL. thanks for your help. Bob

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  • WPF - Have a list source defined at runtime but still have sample data for design time

    - by Vaccano
    I have some ListBoxes in my WPF app. I would like to be able to view how the design looks with out having to run the app. But I still want to be able to bind to ItemsSource to my View Model. I know I saw a blog post on how to do this, but I cannot seem to find it now. To reiterate, I want dummy data at design time, but real data at run time and not break the MVVM pattern. Any ideas?

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  • Custom Control Not Playing Nice With PropertyGrid

    - by lumberjack4
    I have a class that is implementing a custom ToolStripItem. Everything seems to work great until I try to add the item to a ContextMenuStrip at design time. If I try to add my custom control straight from the ContextMenuStrip the PropertyGrid freezes up and will not let me modify my Checked or Text properties. But if I go into the ContextMenuStrip PropertyGrid and add my custom control through the Items(...) property, I can modify the custom control just fine within that dialog. I'm not sure if I'm missing an attribute somewhere of if its a problem with the underlying code. Here is a copy of the CustomToolStripItem class. As you can see, its a very simple class. [ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ContextMenuStrip)] public class CustomToolStripItem : ToolStripControlHost { #region Public Properties [Description("Gets or sets a value indicating whether the object is in the checked state")] [ReadOnly(false)] public bool Checked { get { return checkBox.Checked; } set { checkBox.Checked = value; } } [Description("Gets or sets the object's text")] [ReadOnly(false)] public override string Text { get { return checkBox.Text; } set { checkBox.Text = value; } } #endregion Public Properties #region Public Events public event EventHandler CheckedChanged; #endregion Public Events #region Constructors public CustomToolStripItem() : base(new FlowLayoutPanel()) { // Setup the FlowLayoutPanel. controlPanel = (FlowLayoutPanel)base.Control; controlPanel.BackColor = Color.Transparent; // Add the child controls. checkBox.AutoSize = true; controlPanel.Controls.Add(checkBox); ContextMenuStrip strip = new ContextMenuStrip(); } #endregion Constructors #region Protected Methods protected override void OnSubscribeControlEvents(Control control) { base.OnSubscribeControlEvents(control); checkBox.CheckedChanged += new EventHandler(CheckChanged); } protected override void OnUnsubscribeControlEvents(Control control) { base.OnUnsubscribeControlEvents(control); checkBox.CheckedChanged -= new EventHandler(CheckChanged); } #endregion Protected Methods #region Private Methods private void CheckChanged(object sender, EventArgs e) { // Throw the CustomToolStripItem's CheckedChanged event EventHandler handler = CheckedChanged; if (handler != null) { handler(sender, e); } } #endregion Private Methods #region Private Fields private FlowLayoutPanel controlPanel; private CheckBox checkBox = new CheckBox(); #endregion Private Fields }

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  • subsonic in visual studio design host

    - by csizo
    Hi, I'm facing currently a problem regarding Subsonic configuration. What I want to achieve is using subsonic data access in a System.Web.UI.Design.ControlDesigner class. This class is hosted in Visual Studio Environment and enables design time operations on the attached System.Web.UI.WebControls.Control. The only problem is SubSonic seems always looking for SubSonicSection in the application configuration regardless passing connection string to it. The relevant code snippet: using (SharedDbConnectionScope dbScope = new SharedDbConnectionScope(new SqlDataProvider(), ConnectionString)) { Table1 _table1 = new Select().From<..().Where(...).IsEqualTo(...).ExecuteSingle<...>(); Throws exception on ExecuteSingle() method (configuration section was not found) while using (SharedDbConnectionScope dbScope = new SharedDbConnectionScope(ConnectionString)) { Throws exception on new SharedDbConnectionScope() (configuration section was not found) So the question is: Is there any way to pass the settings runtime to bypass the configuration section lookup as I don't want to add any subsonic specific configuration to devenv.configuration Thanks

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  • wpf: design time error while writing Nested type in xaml

    - by viky
    I have created a usercontrol which accept type of enum and assign the values of that enum to a ComboBox control in that usercontrol. Very Simple. I am using this user control in DataTemplates. Problem comes when there comes nested type. I assign that using this notation EnumType="{x:Type myNamespace:ParentType + NestedType}" It works fine at runtime. but at design time it throws error saying Could not create an instance of type 'TypeExtension' Why? Due to this I am not able to see my window at design time. Any help?

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  • EF and design pattern

    - by kathy
    Hello, I’m working on a high volume transactional enterprise application(asp.net, windows app, oracle app as client) which has been designed using n-tire application and SOA architecture .The application was developed in the .NET platform utilizing C#,VB.NET, Framework 3.5 (I’m planning to upgrade to the , Framework 4.0), EF( EF in the data layer level) and WCF(WCF services in the service layer level) Since this is the first project using EF, and having read about using EF in n-tier and SOA applications, and the features available in the EF Feature, I have the following points: Which design pattern should I use in EF( Simple Entities, Change Set, Self-Tracking Entities and DTOs) in the data layer level In addition Which design pattern should I use in the other tier and layer to get the best practices of EF Thanks

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  • MS Access (2010) Enable Design View

    - by Tim GONELLA
    I downloaded the Access template below for doing a home inventory: http://office.microsoft.com/en-us/templates/results.aspx?qu=home%20inventory&ex=1&queryid=0d245f2a%2Dacdc%2D4161%2D92c8%2D8ba16a52ab32&AxInstalled=1&c=0#ai:TC101918100| The design view is not visible, which is a bit of a nuisance. Things I've tried: 1) In options/options/current database/ the check boxes (enable layout view & enable design changes for tables in Datasheet view) are both greyed out. 2) I've unblocked the file using Right-Click-Properties. 3) I've tried copying/exporting the objects to another database. But can only copy/export the tables. 4) I've tried holding shift when opening the DB. 5) Enabling all trust permissions etc. None of these work Does anybody have any suggestions. (I'm using Office 2010) Thanks

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  • Design Web Templates

    - by Pradeep
    Hi, I am a PHP, VB.NET programmer and i like to build websites. I am good at coding but have never done website designing. Please suggest me some good study resource on Photoshop and flash website design. I have recently made few templates on photoshop but don't know how to code them for valid HTML-CSS. Please let me know which is the best method to design website template e.g. Photoshop, DreamWeaver etc. Also provide links to good study and practice resource for the same. Thanks in advance.

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  • Database design - alternatives for Entity Attribute Value (AEV)

    - by Bob
    Hi, see http://stackoverflow.com/questions/695752/product-table-many-kinds-of-product-each-product-has-many-parameters for similar topic. My question: i want to design a database, that will be used for a production facility of different types of products where each product has its own (number of) parameters. because i want the serial numbers to be in one tabel for overview purposes i have a problem with these different paraeters . One solution could be AEV, but it has its downsides, certainly because we have +- 5 products with every product +- 20.000 serial numbers (records). it looks a bit overkill to me... I just don't know how one could design a database so that you have an attribute in a mastertable that says: 'hey, you could find details of this record in THAT detail-table". 'in a way that you qould easely query the results) currenty i am using Visual Basic & Acces 2007. but i'm going to Visual Basic & MySQL. thanks for your help. Bob

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  • Bypassing Windows Copy design

    - by Scott S
    I have been trying to figure out a way to streamline copying files from one drive (network or external in my case) to my main system drives. Short of creating a program that I will have to activate each time then choosing all the info in it, I have no really good design to bypass it. I have been wondering if there was a way to intercept a straight-forward windows copy with a program to do it my way. The basic design would be that upon grabbing the copy (actually for this to be efficient, a group of different copies), the program would organize all the separate copies into a single stream of copies. I've been wanting to do this as recently I have been needing to make backups of a lot of data and move it a lot as all my drives seem to be failing the past few months.

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  • Basic Client-Server Design for persistent connections?

    - by cam
    Here's as far as I understand it: Client & Server make connection Client sends server data Server interprets data, sends client data So on, and so forth, until client sends disconnect signal. I'm just wondering about implementation. Step 2 and 3 are confusing to me, maybe I'm over-complicating it. Is there anymore to interpreting the data than a giant switch statement? Any good books on client/server design? Specifically talking about multithreaded servers, scalability, and message design (byte 1 = header info, byte 2 = blah blah, etc)? Specifically geared towards C++.

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  • CURL alternative - Design ideas

    - by Vincent
    All, I am looking for some web application design ideas here. I have a server X that hosts an SDK, which has the capacity to talk a piece of hardware. When I make an HTTPS request from an external PHP web application (hosted on Server Y) to Server X through curl, Server X gives JSON data as a response. I use this data to render my UI for the web app on Server Y. The above method seems to be slow and has a tendency to fail in production if there are too many concurrent requests. Can anybody let me know if there is an alternative to CURL or any other design people are using to pull data like this from servers? Thanks

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  • Design Stock Server Application in C++

    - by Avinash
    [Queston asked in ML Interview] Design an server/application which handle multiple incoming stock information ( stock symbol and values ) Server need to store the information in some cache ( need to design the data structure ), There are multiple client connected to server using tcp/ip socket. They will subscribe to particular request say stock symbol XYZ , and may be for more then one. As and when there is change the stock symbol server should broadcast the information to subscribed client. If tcp/ip write failed, server should handle the unregistration of the client. What various data structures will be used and how threading model will be ?

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  • custom flex component, visual controls in design view

    - by bo
    Do you know how if you drag an <mx:Label> or <s:Label> component into your Flex project, when you go to design mode you get this panel on the right to set its properties like text etc. I have a custom component that I can call with actionscript, or with mxml like this: <comps:TheComp field1="OK" field2="Yes" /> The component takes this input and uses it for its internal operation private var field1:String; private var field2:String; private function initializeit() { // component takes the input and lays it out as needed } When I go to design mode, I can see the component under custom components, I can drag it to the stage and see it, but can't set its values field1 and field visually on the right like a normal <s:Label> or <mx:Label> would have. Any idea how I can add that? Do I need to make it inherit something or anything else

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