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| Chain of Responsibility Design pattern - Implementation |
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| Chain of Responsibility Design pattern - Implementation - Class Diagram |
RsHandler.java
public abstract class RsHandler
{
RsHandler rsHandler;
public void nextHandler( RsHandler rsHandler )
{
this.rsHandler = rsHandler;
}
public abstract void dispatchRs( long requestedAmount );
}
HundredRsHandler.java
public class HundredRsHandler extends RsHandler
{
public void dispatchRs(long requestedAmount)
{
long numberofNotesToBeDispatched = requestedAmount / 100;
if (numberofNotesToBeDispatched > 0)
{
if(numberofNotesToBeDispatched>1)
{
System.out.println(numberofNotesToBeDispatched + " ,Hundred Rs notes are dispatched by HundredRsHandler\n");
}
else
{
System.out.println(numberofNotesToBeDispatched + " ,Hundred Rs note is dispatched by HundredRsHandler\n");
}
}
long pendingAmountToBeProcessed = requestedAmount % 100;
if (pendingAmountToBeProcessed > 0)
{
rsHandler.dispatchRs(pendingAmountToBeProcessed);
}
}
}
FiftyRsHandler.java
public class FiftyRsHandler extends RsHandler
{
public void dispatchRs(long requestedAmount)
{
long numberofNotesToBeDispatched = requestedAmount / 50;
if (numberofNotesToBeDispatched > 0)
{
if (numberofNotesToBeDispatched > 1)
{
System.out.println(numberofNotesToBeDispatched + " ,Fifty Rs notes are dispatched by FiftyRsHandler\n");
}
else
{
System.out.println(numberofNotesToBeDispatched + " ,Fifty Rs note is dispatched by FiftyRsHandler\n");
}
}
long pendingAmountToBeProcessed = requestedAmount % 50;
if (pendingAmountToBeProcessed > 0)
{
rsHandler.dispatchRs(pendingAmountToBeProcessed);
}
}
}
TwentyRsHandler.java
public class TwentyRsHandler extends RsHandler
{
public void dispatchRs(long requestedAmount)
{
long numberofNotesToBeDispatched = requestedAmount / 20;
if (numberofNotesToBeDispatched > 0)
{
if (numberofNotesToBeDispatched > 1)
{
System.out.println(numberofNotesToBeDispatched + " ,Twenty Rs notes are dispatched by TwentyRsHandler\n");
}
else
{
System.out.println(numberofNotesToBeDispatched + " ,Twenty Rs note is dispatched by TwentyRsHandler\n");
}
}
long pendingAmountToBeProcessed = requestedAmount % 20;
if (pendingAmountToBeProcessed > 0)
{
rsHandler.dispatchRs(pendingAmountToBeProcessed);
}
}
}
FiveRsHandler.java
public class FiveRsHandler extends RsHandler
{
public void dispatchRs(long requestedAmount)
{
long numberofNotesToBeDispatched = requestedAmount / 5;
if (numberofNotesToBeDispatched > 0)
{
if (numberofNotesToBeDispatched > 1)
{
System.out.println(numberofNotesToBeDispatched + " ,Five Rs notes are dispatched by FiveRsHandler\n");
}
else
{
System.out.println(numberofNotesToBeDispatched + " ,Five Rs note is dispatched by FiveRsHandler\n");
}
}
long pendingAmountToBeProcessed = requestedAmount % 5;
if (pendingAmountToBeProcessed > 0)
{
rsHandler.dispatchRs(pendingAmountToBeProcessed);
}
}
}
ATM.java
public class ATM
{
private static HundredRsHandler hundredRsHandler = new HundredRsHandler();
private static FiftyRsHandler fiftyRsHandler = new FiftyRsHandler();
private static TwentyRsHandler twentyRsHandler = new TwentyRsHandler();
private static FiveRsHandler fiveRsHandler = new FiveRsHandler();
static
{
// Prepare the chain of Handlers
hundredRsHandler.nextHandler(fiftyRsHandler);
fiftyRsHandler.nextHandler(twentyRsHandler);
twentyRsHandler.nextHandler(fiveRsHandler);
}
public void withdraw( long requestedAmount )
{
hundredRsHandler.dispatchRs(requestedAmount);
}
}
ChainOfResDemo.java
public class ChainOfResDemo
{
public static void main( String[] args )
{
ATM atm = new ATM();
System.out.println("\n ----------------Requested Amount 475-----------------------\n");
atm.withdraw(475);
System.out.println("\n ----------------Requested Amount 455-----------------------\n");
atm.withdraw(455);
System.out.println("\n ----------------Requested Amount 520-----------------------\n");
atm.withdraw(520);
}
}
Output
----------------Requested Amount 475-----------------------
4 ,Hundred Rs notes are dispatched by HundredRsHandler
1 ,Fifty Rs note is dispatched by FiftyRsHandler
1 ,Twenty Rs note is dispatched by TwentyRsHandler
1 ,Five Rs note is dispatched by FiveRsHandler
----------------Requested Amount 455-----------------------
4 ,Hundred Rs notes are dispatched by HundredRsHandler
1 ,Fifty Rs note is dispatched by FiftyRsHandler
1 ,Five Rs note is dispatched by FiveRsHandler
----------------Requested Amount 520-----------------------
5 ,Hundred Rs notes are dispatched by HundredRsHandler
1 ,Twenty Rs note is dispatched by TwentyRsHandler
See also:
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