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  • What am i doing wrong

    - by Erik Sapir
    I have the following code. I need B class to have a min priority queue of AToTime objects. AToTime have operator, and yet i receive error telling me than there is no operator matching the operands... #include <queue> #include <functional> using namespace std; class B{ //public functions public: B(); virtual ~B(); //private members private: log4cxx::LoggerPtr m_logger; class AToTime { //public functions public: AToTime(const ACE_Time_Value& time, const APtr a) : m_time(time), m_a(a){} bool operator >(const AToTime& other) { return m_time > other.m_time; } //public members - no point using any private members here public: ACE_Time_Value m_time; APtr m_a; }; priority_queue<AToTime, vector<AToTime>, greater<AToTime> > m_myMinHeap; };

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  • What to do of exceptions when implementing java.lang.Iterator

    - by Vincent Robert
    The java.lang.Iterator interface has 3 methods: hasNext, next and remove. In order to implement a read-only iterator, you have to provide an implementation for 2 of those: hasNext and next. My problem is that these methods does not declare any exceptions. So if my code inside the iteration process declares exceptions, I must enclose my iteration code inside a try/catch block. My current policy has been to rethrow the exception enclosed in a RuntimeException. But this has issues because the checked exceptions are lost and the client code no longer can catch those exceptions explicitly. How can I work around this limitation in the Iterator class? Here is a sample code for clarity: class MyIterator implements Iterator { @Override public boolean hasNext() { try { return implementation.testForNext(); } catch ( SomethingBadException e ) { throw new RuntimeException(e); } } @Override public boolean next() { try { return implementation.getNext(); } catch ( SomethingBadException e ) { throw new RuntimeException(e); } } ... }

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  • How to maintain the state of button cutom listview in android

    - by Akshay
    I have custom ListView with three TextView three Button and three Chronometer. And the situation is I am loading the ListView properly.But while loading ListView I am disabling some button in the ListView by checking one parameter. Up to this point ListView is showing it's row properly. But when I am scrolling the ListView at that time previously enabled Button are getting disabled.What I am doing wrong I am not getting can one please point out my mistake Or any suggestion. Here is my Adapter class. public class OrderSmartKitchenAdapter extends BaseAdapter { private int flagDeliveryComplete = 0; private int flagPreparationComplete = 0; private int flagPreparationStarted = 0; private List<OrderitemdetailsBO> list = new ArrayList<OrderitemdetailsBO(); private int orderStatus; public OrderSmartKitchenAdapter() { // TODO Auto-generated constructor stub } public void setOrderList(List<OrderitemdetailsBO> orderList) { this.list = orderList; } @Override public int getCount() { // TODO Auto-generated method stub Log.i("OrderItemList Size :-", Integer.toString(list.size())); return list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } @Override public View getView(final int position, View convertView,ViewGroup parent) { // TODO Auto-generated method stub final ViewHolder viewHolder ; if (convertView == null) { layoutInflater = LayoutInflater.from(myContext); convertView = layoutInflater.inflate(R.layout.table_row_view,null); viewHolder = new ViewHolder(); viewHolder.txtTableNumber = (TextView) convertView.findViewById(R.id.txtTableNumber); viewHolder.txtMenuItem = (TextView) convertView.findViewById(R.id.txtMenuItem); viewHolder.txtQuantity = (TextView) convertView.findViewById(R.id.txtQuantity); viewHolder.txtOrderAcceptanceTime = (TextView) convertView.findViewById(R.id.txtOrderAcceptanceTime); viewHolder.txtElapsedTimeOfOrderAcceptance = (Chronometer) convertView.findViewById(R.id.txtElapsedTimeOfOrderAcceptance); viewHolder.btnPreparationStart = (Button) convertView.findViewById(R.id.btnPreparationStart); viewHolder.btnPreparationStart.setTag(position); viewHolder.txtElapsedTimeForPreparation = (Chronometer) convertView.findViewById(R.id.txtElapsedTimeForPrepatration); viewHolder.btnPreparationComplete = (Button) convertView.findViewById(R.id.btnPreparationCompleted); viewHolder.btnPreparationComplete.setTag(position); viewHolder.txtElapsedTimeForDeliveryComplete = (Chronometer) convertView.findViewById(R.id.txtElapsedTimeForCompleation); viewHolder.btnDeliveryComplete = (Button) convertView.findViewById(R.id.btnOrderComplete); viewHolder.btnDeliveryComplete.setTag(position); convertView.setTag(viewHolder); } else{ viewHolder = (ViewHolder)convertView.getTag(); viewHolder.btnDeliveryComplete.setTag(position); viewHolder.btnPreparationComplete.setTag(position); viewHolder.btnPreparationStart.setTag(position); } if (list.get(position) != null) { OrderitemdetailsBO orderitemdetailsBO = new OrderitemdetailsBO(); orderitemdetailsBO = list.get(position); viewHolder.txtTableNumber.setText(orderitemdetailsBO.getOrderitemid().toString()); viewHolder.txtMenuItem.setText(orderitemdetailsBO.getMenuitemname().toString()); viewHolder.txtQuantity.setText(orderitemdetailsBO.getQuantity().toString()); Log.i("Table Number :-", Long.toString(orderitemdetailsBO.getOrderitemid())); Log.i("Menu Name :-", orderitemdetailsBO.getMenuitemname().toString()); Log.i("Quantity", orderitemdetailsBO.getQuantity().toString()); Date acceptTime = new Date(); acceptTime = orderitemdetailsBO.getOrderdatetime(); viewHolder.txtOrderAcceptanceTime.setText(DateUtil.getDateAsString(acceptTime,"HH:mm")); Log.i("Order Accept Time :-", acceptTime.getMinutes() + ":"+ acceptTime.getSeconds()); orderStatus = orderitemdetailsBO.getOrderstatus(); Date preparationStartTime = new Date(); preparationStartTime = orderitemdetailsBO.getPreparationstarttime(); if(preparationStartTime != null) { Log.i("OrderSmartKitchenActivity", "2 Order Acceptance Time :-" + "Menu Item id "+ orderitemdetailsBO.getOrderitemid() + " Preparation Start time " + orderitemdetailsBO.getPreparationstarttime() ); viewHolder.txtElapsedTimeOfOrderAcceptance.stop(); Log.i("Preparation Start Time :-",preparationStartTime.getMinutes() + ":" + preparationStartTime.getSeconds()); viewHolder.txtElapsedTimeOfOrderAcceptance.setText(DateUtil.getDateAsString(preparationStartTime,"MM:ss")); viewHolder.txtElapsedTimeOfOrderAcceptance.stop(); viewHolder.btnPreparationStart.setEnabled(false); viewHolder.btnPreparationStart.setClickable(false); viewHolder.btnPreparationStart.setBackgroundColor(Color.LTGRAY); } else { Long n = acceptTime.getTime(); Log.i("OrderSmartKitchenActivity", "Order Acceptance Time :-" + "Menu Item id "+ orderitemdetailsBO.getOrderitemid() + " Acceptance time" + Long.toString(n) + " Preparation Start time " + orderitemdetailsBO.getPreparationstarttime() ); // Calculate Time difference viewHolder.txtElapsedTimeOfOrderAcceptance.setBase(SystemClock.elapsedRealtime() - System.currentTimeMillis() + n); viewHolder.txtElapsedTimeOfOrderAcceptance.getBase(); viewHolder.txtElapsedTimeOfOrderAcceptance.start(); viewHolder.txtElapsedTimeOfOrderAcceptance.setFormat("%s"); } viewHolder.btnPreparationStart.setOnClickListener(new OnClickListener() { @Override public void onClick(final View v) { // TODO Auto-generated method stub if (flagPreparationStarted == 0) { flagPreparationStarted++; v.startAnimation(playAnimation()); handler.postDelayed(new Runnable() { @Override public void run() { // TODO Auto-generated method stub v.clearAnimation(); Date currentTime = new Date(); // Set Preparation Start Time. viewHolder.txtElapsedTimeOfOrderAcceptance.stop(); Date setTime = new Date(currentTime.getTime() * 1000); OrderitemdetailsBO orderitemdetailsBO = list.get(position); orderitemdetailsBO.setPreparationstarttime(setTime); String orderDetails = "2"; String getPosition = Integer.toString(position); viewHolder.btnPreparationStart.setBackgroundColor(Color.LTGRAY); new sendOrderStatusToServer().execute(orderDetails,getPosition); } }, 5000); } else { handler.removeCallbacksAndMessages(null); v.clearAnimation(); flagPreparationStarted = 0; Log.i("Handler Removed. :-", "Here"); } } }); String preparationTime = orderitemdetailsBO.getOrderpreparationtime(); if(preparationTime != null && orderStatus == order_preparationComplete) { viewHolder.txtElapsedTimeForPreparation.setText(preparationTime); viewHolder.txtElapsedTimeForPreparation.stop(); viewHolder.btnPreparationComplete.getTag(position); viewHolder.btnPreparationComplete.setEnabled(false); viewHolder.btnPreparationComplete.setClickable(false); viewHolder.btnPreparationComplete.setBackgroundColor(Color.LTGRAY); } else if( orderStatus == order_preparationStart || orderStatus == orderReceived || orderStatus == order_delivered){ Long n = acceptTime.getTime(); Log.i("Preparation Start Time :-", Long.toString(n)); viewHolder.txtElapsedTimeForPreparation.setBase(SystemClock.elapsedRealtime() - System.currentTimeMillis() + n); viewHolder.txtElapsedTimeForPreparation.getBase(); viewHolder.txtElapsedTimeForPreparation.start(); viewHolder.txtElapsedTimeForPreparation.setFormat("%s"); } viewHolder.btnPreparationComplete.setOnClickListener(new OnClickListener() { @Override public void onClick(final View v) { // TODO Auto-generated method if (flagPreparationComplete == 0) { flagPreparationComplete++; v.startAnimation(playAnimation()); handler.postDelayed(new Runnable() { @Override public void run() { // TODO Auto-generated method stub v.clearAnimation(); OrderitemdetailsBO orderitemdetailsBO = list.get(position); Date date = orderitemdetailsBO.getPreparationstarttime(); if(date != null) { viewHolder.txtElapsedTimeForPreparation.stop(); Date currentTime = new Date(); Calendar calendar = Calendar.getInstance(); int minute = calendar.get(Calendar.MINUTE); int second = calendar.get(Calendar.SECOND); orderitemdetailsBO.setOrderpreparationtime(calendar.get(Calendar.MINUTE) +":" +calendar.get(Calendar.SECOND)); String orderDetails = "3"; String getPosition = Integer.toString(position); viewHolder.btnPreparationComplete.setBackgroundColor(Color.LTGRAY); new sendOrderStatusToServer().execute(orderDetails,getPosition); } else { Toast.makeText(myContext, "Please Enter Preparation Start Time.", Toast.LENGTH_LONG).show(); } } }, 5000); } else { handler.removeCallbacksAndMessages(null); v.clearAnimation(); flagPreparationComplete = 0; } } }); String deleveredTime = orderitemdetailsBO.getOrderdeliverytime(); if(deleveredTime != null && orderStatus == order_delivered) { Date delevered = new Date(Long.parseLong(deleveredTime)); viewHolder.txtElapsedTimeForPreparation.setText(DateUtil.getDateAsString(delevered,"MM:ss")); Log.i("Preparation Start Time :-", delevered.getMinutes()+":"+delevered.getSeconds()); viewHolder.txtElapsedTimeForPreparation.stop(); viewHolder.btnDeliveryComplete.getTag(position); viewHolder.btnDeliveryComplete.setEnabled(false); viewHolder.btnDeliveryComplete.setClickable(false); viewHolder.btnDeliveryComplete.setBackgroundColor(Color.LTGRAY); } else if(orderStatus == 3 || orderStatus == 2 || orderStatus == 1) { Long n = acceptTime.getTime(); Log.i("Preparation Start Time :-", Long.toString(n)); viewHolder.txtElapsedTimeForDeliveryComplete.setTag(list.get(position)); viewHolder.txtElapsedTimeForDeliveryComplete.setBase(SystemClock.elapsedRealtime() - System.currentTimeMillis() + n); viewHolder.txtElapsedTimeForDeliveryComplete.getBase(); viewHolder.txtElapsedTimeForDeliveryComplete.start(); viewHolder.txtElapsedTimeForDeliveryComplete.setFormat("%s"); } viewHolder.btnDeliveryComplete.setOnClickListener(new OnClickListener() { @Override public void onClick(final View v) { // TODO Auto-generated method stub if (flagDeliveryComplete == 0) { flagDeliveryComplete++; v.startAnimation(playAnimation()); handler.postDelayed(new Runnable() { @Override public void run() { // TODO Auto-generated method stub v.clearAnimation(); OrderitemdetailsBO orderitemdetailsBO = list.get(position); Date date = orderitemdetailsBO.getPreparationstarttime(); String preparationComplete = orderitemdetailsBO.getOrderpreparationtime(); if(date != null && preparationComplete != null ) { Date currentTime = new Date(); Calendar calendar = Calendar.getInstance(); viewHolder.txtElapsedTimeForDeliveryComplete.stop(); orderitemdetailsBO.setOrderdeliverytime(calendar.get(Calendar.MINUTE) +":"+calendar.get(Calendar.SECOND)); String orderDetails = Integer.toString(order_delivered); String getPosition = Integer.toString(position); viewHolder.btnDeliveryComplete.setBackgroundColor(Color.LTGRAY); new sendOrderStatusToServer().execute(orderDetails,getPosition); } else { Toast.makeText(myContext, "Please Enter Preparation Start Time & Preparation Complete Time.", Toast.LENGTH_LONG).show(); } } }, 5000); } else { handler.removeCallbacksAndMessages(null); v.clearAnimation(); flagDeliveryComplete = 0; } } }); } return convertView; } } private static class ViewHolder { protected TextView txtTableNumber; protected TextView txtMenuItem; protected TextView txtQuantity; protected TextView txtOrderAcceptanceTime; protected Chronometer txtElapsedTimeOfOrderAcceptance; protected Button btnPreparationStart; protected Chronometer txtElapsedTimeForPreparation; protected Button btnPreparationComplete; protected Chronometer txtElapsedTimeForDeliveryComplete; protected Button btnDeliveryComplete; }

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  • how to show integer values in JComboBox?

    - by Edan
    Hello, I would like to know how to set a JComboBox that contain integers values that I could save. Here is the definitions of values: public class Item { private String itemDesc; private int itemType; public static int ENTREE=0; public static int MAIN_MEAL=1; public static int DESSERT=2; public static int DRINK=3; private float price; int[] itemTypeArray = { ENTREE, MAIN_MEAL, DESSERT, DRINK }; Object[][] data = {{itemDesc, new Integer(itemType), new Float(price)}}; . . . } Now, I want the add a JComboBox that the user will choose 1 of the items (ENTREE, MAIN_MEAL...) and then I could set the number as an Integer. I know that JComboBox need to be something like that: JComboBox combo = new JComboBox(itemTypeArray.values()); JOptionPane.showMessageDialog( null, combo,"Please Enter Item Type", `JOptionPane.QUESTION_MESSAGE);` What am I doing wrong?

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  • Cross-reference between delphi records

    - by Paul-Jan
    Let's say I have a record TQuaternion and a record TVector. Quaternions have some methods with TVector parameters. On the other hand, TVector supports some operations that have TQuaternion parameters. Knowing that Delphi (Win32) does not allow for forward record declarations, how do I solve this elegantly? Using classes is not really an option here, because I really want to use operator overloading for this rare case where it actually makes good sense. For now I simply moved these particular methods out of the records and into separate functions, the good old-fashioned way. Better suggestions are most welcome.

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  • Having vCam on custom classes instead of the root class.

    - by Hwang
    Maybe some of you guys know bout vCam from http://bryanheisey.com/blog/?page_id=22 I'm trying to have the script running on a custom classes instead of a MovieClip in the library. But after some trying I fail so I stick back to having the MC in the library and load the MC from the project root action-script files. Now it works fine if I run the MC on the root as files, but for more organizing purposes on my action-script files, I was thinking of calling it from a custom classes(where I can control the vCam), then call the custom classes from the root action-script files. But seems like it won't work other than the root action-script files. I'm not sure whether I'm missing any codes between the two custom classes, or its not coded to run that way. If it's not, then its fine too just that I want the things more organize. Or if you have any idea how to 'by-pass' this, please do tell me so. In case you need my code for the 2 classes, here it is: package { import flash.display.MovieClip; import classes.vCamera; public class main extends MovieClip { private var vC2:vCamera = new vCamera(); public function main():void { addChild(vC2) } } } package classes{ import flash.display.MovieClip; import flash.display.Stage; import flash.events.Event; public class vCamera extends MovieClip{ private var vC:vCam = new vCam(); public function vCamera():void{ addEventListener(Event.ADDED_TO_STAGE, add2Stage) } private function add2Stage(event:Event):void{ vC.x=stage.stageWidth/2; vC.y=stage.stageHeight/2; vC.rotation=15; addChild(vC); } } }

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  • Inheritance in Java

    - by Mandar
    Hello, recently I went through the inheritance concept. As we all know, in inheritance, superclass objects are created/initialized prior to subclass objects. So if we create an object of subclass, it will contain all the superclass information. But I got stuck at one point. Do the superclass and the subclass methods are present on separate call-stack? If it is so, is there any specific reason for same? If it is not so, why they don't appear on same call-stack? E.g. // Superclass class A { void play1( ) { // .... } } // Subclass class B extends A { void play2( ) { //..... } } Then does the above 2 methods i.e play1( ) and play2( ) appear on separate call stack? Thanks.

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  • updating system's time using .Net

    - by user62958
    I am trying to update my system time using the following: [StructLayout(LayoutKind.Sequential)] private struct SYSTEMTIME { public ushort wYear; public ushort wMonth; public ushort wDayOfWeek; public ushort wDay; public ushort wHour; public ushort wMinute; public ushort wSecond; public ushort wMilliseconds; } [DllImport("kernel32.dll", EntryPoint = "GetSystemTime", SetLastError = true)] private extern static void Win32GetSystemTime(ref SYSTEMTIME lpSystemTime); [DllImport("kernel32.dll", EntryPoint = "SetSystemTime", SetLastError = true)] private extern static bool Win32SetSystemTime(ref SYSTEMTIME lpSystemTime); public void SetTime() { TimeSystem correctTime = new TimeSystem(); DateTime sysTime = correctTime.GetSystemTime(); // Call the native GetSystemTime method // with the defined structure. SYSTEMTIME systime = new SYSTEMTIME(); Win32GetSystemTime(ref systime); // Set the system clock ahead one hour. systime.wYear = (ushort)sysTime.Year; systime.wMonth = (ushort)sysTime.Month; systime.wDayOfWeek = (ushort)sysTime.DayOfWeek; systime.wDay = (ushort)sysTime.Day; systime.wHour = (ushort)sysTime.Hour; systime.wMinute = (ushort)sysTime.Minute; systime.wSecond = (ushort)sysTime.Second; systime.wMilliseconds = (ushort)sysTime.Millisecond; Win32SetSystemTime(ref systime); } When I debug everything looks good and all the values are correct but when it calles the Win32SetSystemTime(ref systime) th actual time of system(display time) doesn't change and stays the same. The strange part is that when I call the Win32GetSystemTime(ref systime) it gives me the new updated time. Can someone give me some help on this?

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  • CodeIgniter based e-shop, shipping and gift address design problem

    - by alexander
    While building an ecommerce platform I have run into design problems. I'm working with the built-in CodeIgniter's cart class. It stores all the cart information in session. Let say that cart has already been filled with products and user clicks checkout. When should I store order in database? Just after that click or after several steps of gathering information and stoing it in session? How to deal with additional features like different shipping methods? Should I add it to the basket first and get additional (gift address) to session? I dont want to store it in database because of the relation between gift address and order is needed and since I dont know what's the ID of the order. I'm puzzled :) Additionally I think its crucial to keep cart aware of shipping methods and additional bought services (by selecting gift address there is an extra fee) because the cart content is just like an reciept? In brief, what is the best practice to process checkout?

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  • I want to read program content from command line.

    - by Alexandre Dominos
    I am trying to update a program which was wrotten in 1995 with pascal or c. I am not sure about programming language. Command line program. Now I am coded in C#. And I want to read program command line content. Is it possible? I tried something. But not succesfull. They are: private void aboutToolStripMenuItem_Click(object sender, EventArgs e) { // Redirect the output stream of the child process. p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.FileName = "osl.exe"; p.Start(); logs.AppendText("Timer Started\n"); timer1.Enabled = true; } private void timer1_Tick(object sender, EventArgs e) { // write somethingg and read what is the program doing on command line? // What is the program printint? etc... // I try this code but not enough for mo. // logs.AppendText("d:" + p.StandardOutput.ReadToEnd()+"\n"); } private void p_Exited(object sender, EventArgs e) { timer1.Enabled = false; } i am open to any idea in java,cpp,c,c#.

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  • Some basic COM question...

    - by smwikipedia
    I have just finished my first COM server DLL. And it runs smoothly. So I'd like to show my understanding for now and hear your critics. 1- How COM simply works? COM - "The Call Chain" COM Lib methods - Traditional DLL exports - Classes encapsulated in the COM DLL 2- With C++, the benefits like "interface" in OOP can only be taken advantage of at the source level. With COM, these benefits can be used at a binary level. 3- Some illustration about interface &pInterface ------- pInterface ---------- Interface----------------- methods Ixx ** Ixx * (method table) (void **) A Interface is a data structure in memory. It's nothing but a memory area containg a method table. Is my understanding alright? Thanks for your revision.

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  • Android Accessing Accelerometer: Returns always 0 as Value

    - by Rotesmofa
    Hello there, i would like to use the accelerometer in an Android Handset for my Application. The data from the sensor will be saved together with a GPS Point, so the Value is only needed when the GPS Point is updated. If i use the attached Code the values is always zero. API Level 8 Permissions: Internet, Fine Location Testing Device: Galaxy S(i9000), Nexus One Any Suggestions? I am stuck at this point. Best regards from Germany, Pascal import android.app.Activity; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; public class AccelerometerService extends Activity{ AccelerometerData accelerometerData; private SensorManager mSensorManager; private float x,y,z; private class AccelerometerData implements SensorEventListener{ public void onSensorChanged(SensorEvent event) { x = event.values[0]; y = event.values[1]; z = event.values[2]; } public void onAccuracyChanged(Sensor sensor, int accuracy) {} } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); mSensorManager.registerListener(accelerometerData, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_FASTEST); } @Override protected void onResume() { super.onResume(); } @Override protected void onStop() { mSensorManager.unregisterListener(accelerometerData); super.onStop(); } public String getSensorString() { return ("X: " + x+"m/s, Y: "+ y +"m/s, Z: "+ z +"m/s" ); } }

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  • Am I using Settings in .NET correctly?

    - by Sergio Tapia
    Here's what I'm doing. I have three properties: MomsBackground, DadsBackground and ChosenBackground. When Momsbackground is selected in the program, I set the ChosenBackground string according to what item the user has clicked (either "Mom" or "Dad"). Then on Form_Load() I use a switch case for the ChosenBackground string and according to that select This.BackgroundColor to MomsBackground or DadsBackground. Code below: Am I using this as it was intended? Sorry, codes there now. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void momToolStripMenuItem_Click(object sender, EventArgs e) { this.BackColor = Properties.Settings.Default.MomFormColor; Properties.Settings.Default.SelectedTheme = "Mom"; Properties.Settings.Default.Save(); } private void dadToolStripMenuItem_Click(object sender, EventArgs e) { this.BackColor = Properties.Settings.Default.DadFormColor; Properties.Settings.Default.SelectedTheme = "Dad"; Properties.Settings.Default.Save(); } private void Form1_Load(object sender, EventArgs e) { switch (Properties.Settings.Default.SelectedTheme) { case "Mom": this.BackColor = Properties.Settings.Default.MomFormColor; break; case "Dad": this.BackColor = Properties.Settings.Default.DadFormColor; break; default: break; } } } }

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  • Constructor versus setter injection

    - by Chris
    Hi, I'm currently designing an API where I wish to allow configuration via a variety of methods. One method is via an XML configuration schema and another method is through an API that I wish to play nicely with Spring. My XML schema parsing code was previously hidden and therefore the only concern was for it to work but now I wish to build a public API and I'm quite concerned about best-practice. It seems that many favor javabean type PoJo's with default zero parameter constructors and then setter injection. The problem I am trying to tackle is that some setter methods implementations are dependent on other setter methods being called before them in sequence. I could write anal setters that will tolerate themselves being called in many orders but that will not solve the problem of a user forgetting to set the appropriate setter and therefore the bean being in an incomplete state. The only solution I can think of is to forget about the objects being 'beans' and enforce the required parameters via constructor injection. An example of this is in the default setting of the id of a component based on the id of the parent components. My Interface public interface IMyIdentityInterface { public String getId(); /* A null value should create a unique meaningful default */ public void setId(String id); public IMyIdentityInterface getParent(); public void setParent(IMyIdentityInterface parent); } Base Implementation of interface: public abstract class MyIdentityBaseClass implements IMyIdentityInterface { private String _id; private IMyIdentityInterface _parent; public MyIdentityBaseClass () {} @Override public String getId() { return _id; } /** * If the id is null, then use the id of the parent component * appended with a lower-cased simple name of the current impl * class along with a counter suffix to enforce uniqueness */ @Override public void setId(String id) { if (id == null) { IMyIdentityInterface parent = getParent(); if (parent == null) { // this may be the top level component or it may be that // the user called setId() before setParent(..) } else { _id = Helpers.makeIdFromParent(parent,getClass()); } } else { _id = id; } } @Override public IMyIdentityInterface getParent() { return _parent; } @Override public void setParent(IMyIdentityInterface parent) { _parent = parent; } } Every component in the framework will have a parent except for the top level component. Using the setter type of injection, then the setters will have different behavior based on the order of the calling of the setters. In this case, would you agree, that a constructor taking a reference to the parent is better and dropping the parent setter method from the interface entirely? Is it considered bad practice if I wish to be able to configure these components using an IoC container? Chris

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  • Fastest method for SQL Server inserts, updates, selects from C# ASP.Net 2.0+

    - by Ian
    Hi All, long time listener, first time caller. I use SPs and this isn't an SP vs code-behind "Build your SQL command" question. I'm looking for a high-throughput method for a backend app that handles many small transactions. I use SQLDataReader for most of the returns since forward only works in most cases for me. I've seen it done many ways, and used most of them myself. Methods that define and accept the stored procedure parameters as parameters themselves and build using cmd.Parameters.Add (with or without specifying the DB value type and/or length) Assembling your SP params and their values into an array or hashtable, then passing to a more abstract method that parses the collection and then runs cmd.Parameters.Add Classes that represent tables, initializing the class upon need, setting the public properties that represent the table fields, and calling methods like Save, Load, etc I'm sure there are others I've seen but can't think of at the moment as well. I'm open to all suggestions.

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  • COM on Windows7 and Visual Studio

    - by vikasde
    I registered a COM dll (under administrator) using regsvr32, which I want to use in Visual Studio 2008 (under administrator) for my project in Windows 7. Now, when I try to use the interfaces and classes from the COM, then I can't see any of the methods. When I use the object browser to view the COM classes, then I can see that they are all empty. However when I use the same COM on windows XP using VS2008, then all methods are suddenly available. Does anybody know why this is happening and how to get this working under Windows 7?

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  • Lightweight alternative to Manual/AutoResetEvent in C#

    - by sweetlilmre
    Hi, I have written what I hope is a lightweight alternative to using the ManualResetEvent and AutoResetEvent classes in C#/.NET. The reasoning behind this was to have Event like functionality without the weight of using a kernel locking object. Although the code seems to work well in both testing and production, getting this kind of thing right for all possibilities can be a fraught undertaking and I would humbly request any constructive comments and or criticism from the StackOverflow crowd on this. Hopefully (after review) this will be useful to others. Usage should be similar to the Manual/AutoResetEvent classes with Notify() used for Set(). Here goes: using System; using System.Threading; public class Signal { private readonly object _lock = new object(); private readonly bool _autoResetSignal; private bool _notified; public Signal() : this(false, false) { } public Signal(bool initialState, bool autoReset) { _autoResetSignal = autoReset; _notified = initialState; } public virtual void Notify() { lock (_lock) { // first time? if (!_notified) { // set the flag _notified = true; // unblock a thread which is waiting on this signal Monitor.Pulse(_lock); } } } public void Wait() { Wait(Timeout.Infinite); } public virtual bool Wait(int milliseconds) { lock (_lock) { bool ret = true; // this check needs to be inside the lock otherwise you can get nailed // with a race condition where the notify thread sets the flag AFTER // the waiting thread has checked it and acquires the lock and does the // pulse before the Monitor.Wait below - when this happens the caller // will wait forever as he "just missed" the only pulse which is ever // going to happen if (!_notified) { ret = Monitor.Wait(_lock, milliseconds); } if (_autoResetSignal) { _notified = false; } return (ret); } } }

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  • How can I check if a user has written his username and password correctly?

    - by Sergio Tapia
    I'm using a Linq-to-SQL class called Scans.dbml. In that class I've dragged a table called Users (username, password, role) onto the graphic area and now I can access User object via a UserRepository class: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Scanner.Classes { public class UserRepository { private ScansDataContext db = new ScansDataContext(); public User getUser(string username) { return db.Users.SingleOrDefault(x => x.username == username); } public bool exists(string username) { } } } Now in my Login form, I want to use this Linq-to-SQL goodness to do all the data related activities. UserRepository users = new UserRepository(); private void btnLogin_Click(object sender, EventArgs e) { loginToSystem(); } private void loginToSystem() { if (users.getUser(txtUsername.Text)) { } //If txtUsername exists && User.password == Salt(txtPassword) //then Show.MainForm() with User.accountType in constructor to set permissions. } I need help with verifying that a user exists && that that users.password is equal to SALT(txtpassword.text). Any guidance please?

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  • Multiple actions upon a case statement in Haskell

    - by Schroedinger
    One last question for the evening, I'm building the main input function of my Haskell program and I have to check for the args that are brought in so I use args <- getArgs case length args of 0 -> putStrLn "No Arguments, exiting" otherwise -> { other methods here} Is there an intelligent way of setting up other methods, or is it in my best interest to write a function that the other case is thrown to within the main? Or is there an even better solution to the issue of cases. I've just got to take in one name.

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  • Someone explain to me the meanings behind the naming conventions used in .net?

    - by IbrarMumtaz
    I need someone to explain the following names; Asynchronous Delegates. Asynchronous methods. Asynchronous events. I'm currently going over this for my 70-536 exam and I am covering all my bases so far. The threading chapter and online resources have been good to me on my second read through. Still though, the names used above mean absolutely nothing to me? I would really appreciate the meaning behind the word 'Asynchronous' and its relevance to Delegates, methods and events. Feel free to go into as much detail as you like. Thanks, Ibrar

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  • Method synonyms in Ruby

    - by Max
    I'm familiarizing myself with Ruby and it's the first time I see synonyms for methods in the standard library. For now I've found the ones in the Enumerable module: collect <- map detect <- find include <- member etc. Probably other modules contains synonymic methods too. Why are they there? Is it some kind of backward compatibility? Or is it a feature of the language, so the programmer can choose between different options depending on the context to make the program look like plain English?

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  • NullPointerException with static variables

    - by tomekK
    I just hit very strange (to me) behaviour of java. I have following classes: public abstract class Unit { public static final Unit KM = KMUnit.INSTANCE; public static final Unit METERS = MeterUnit.INSTANCE; protected Unit() { } public abstract double getValueInUnit(double value, Unit unit); protected abstract double getValueInMeters(double value); } And: public class KMUnit extends Unit { public static final Unit INSTANCE = new KMUnit(); private KMUnit() { } //here are abstract methods overriden } public class MeterUnit extends Unit { public static final Unit INSTANCE = new MeterUnit(); private MeterUnit() { } ///abstract methods overriden } And my test case: public class TestMetricUnits extends TestCase { @Test public void testConversion() { System.out.println("Unit.METERS: " + Unit.METERS); System.out.println("Unit.KM: " + Unit.KM); double meters = Unit.KM.getValueInUnit(102.11, Unit.METERS); assertEquals(0.10211, meters, 0.00001); } } 1) MKUnit and MeterUnit are both singletons initialized statically, so during class loading. Constructors are private, so they can't be initialized anywhere else. 2) Unit class contains static final references to MKUnit.INSTANCE and MeterUnit.INSTANCE I would expect that: KMUnit class is loaded and instance is created. MeterUnit class is loaded and instance is created. Unit class is loaded and both KM and METERS variable are initialized, they are final so they cant be changed. But when I run my test case in console with maven my result is: T E S T S Running de.audi.echargingstations.tests.TestMetricUnits Unit.METERS: m Unit.KM: null Tests run: 3, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.089 sec <<< FAILURE! - in de.audi.echargingstations.tests.TestMetricUnits testConversion(de.audi.echargingstations.tests.TestMetricUnits) Time elapsed: 0.011 sec <<< ERROR! java.lang.NullPointerException: null at de.audi.echargingstations.tests.TestMetricUnits.testConversion(TestMetricUnits.java:29) Results : Tests in error: TestMetricUnits.testConversion:29 NullPointer And the funny part is that, when I run this test from eclipse via JUnit runner everything is fine, I have no NullPointerException and in console I have: Unit.METERS: m Unit.KM: km So the question is: what can be the reason that KM variable in Unit is null (and in the same time METERS is not null)

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  • Assembly wide multicast attributes. Are they evil?

    - by HeavyWave
    I am working on a project where we have several attributes in AssemblyInfo.cs, that are being multicast to a methods of a particular class. [assembly: Repeatable( AspectPriority = 2, AttributeTargetAssemblies = "MyNamespace", AttributeTargetTypes = "MyNamespace.MyClass", AttributeTargetMemberAttributes = MulticastAttributes.Public, AttributeTargetMembers = "*Impl", Prefix = "Cls")] What I don't like about this, is that it puts a piece of login into AssemblyInfo (Info, mind you!), which for starters should not contain any logic at all. The worst part of it, is that the actual MyClass.cs does not have the attribute anywhere in the file, and it is completely unclear that methods of this class might have them. From my perspective it greatly hurts readability of the code (not to mention that overuse of PostSharp can make debugging a nightmare). Especially when you have multiple multicast attributes. What is the best practice here? Is anyone out there is using PostSharp attributes like this?

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  • Partial Interface in C#

    - by Ngu Soon Hui
    Does C# allows partial interface? i.e., in ManagerFactory1.cs class, I have public partial interface IManagerFactory { // Get Methods ITescoManager GetTescoManager(); ITescoManager GetTescoManager(INHibernateSession session); } and in ManagerFactory.cs class, I have: public partial interface IManagerFactory { // Get Methods IEmployeeManager GetEmployeeManager(); IEmployeeManager GetEmployeeManager(INHibernateSession session); IProductManager GetProductManager(); IProductManager GetProductManager(INHibernateSession session); IStoreManager GetStoreManager(); IStoreManager GetStoreManager(INHibernateSession session); } Both ManagerFactory and ManagerFactory1 are located in the same assembly.

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