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  Classes of Joe Chrzanowski  >  DCI  >  account_example.php  >  Download  
File: account_example.php
Role: Example script
Content type: text/plain
Description: An example using DCI paradigm to illustrate a money transfer
Class: DCI
Implementation of DCI paradigm to separate logic
Author: By
Last change:
Date: 4 years ago
Size: 2,843 bytes
 

Contents

Class file image Download
<?php
    
// require the files needed for this test
    
require_once ("../DCIObject.php");
    require_once (
"../DCIException.php");
    require_once (
"../Context.php");
        
    interface 
rMoneySource {
        function 
Withdraw($amount);
    }
    interface 
rMoneySink {
        function 
Deposit($amount);
    }
    
    class 
rMoneySourceActions {
        static function 
TransferFunds(rMoneySource $selfrMoneySink $dest$amount) {
            if (
$self->Withdraw($amount))
                
$dest->Deposit($amount);
        }
    }
    
    
/**
    * A base Account object.  It's a dumb model, capable only
    * of increasing and decreasing its balance.  We can use 
    * roles to make different Account objects interact with each 
    * other.
    *
    * Contexts are "use cases".  They call role methods to implement interactivity
    * Role methods are "algorithms".  They call various object methods to perform a task
    */
    
class Account 
    
extends DCIObject 
    
implements rMoneySourcerMoneySink {
        protected 
$balance;
        
        function 
__construct($initial_balance) {
            
parent::__construct();
            
            
$this->balance $initial_balance;
        }
        function 
Withdraw($amount) {
            if (
$amount <= $this->balance) {
                
$this->balance -= $amount;
                return 
$amount;
            }
            else 
                throw new 
DCIException("Insufficient Funds","Tried to withdraw $amount<br />{$this->balance} available.");
        }
        function 
Deposit($amount) {
            
$this->balance += $amount;
        }
        function 
GetBalance() { return $this->balance; }
    }
    class 
FeeAccount
    
extends Account {
        function 
Deposit($amount) {
            
$this->balance += ($amount .9);
        }
    }
    
    
/** 
    * The example code-- implemented as a context
    */
    
class TransferCtx extends Context {
        function 
Execute(rMoneySource $sourcerMoneySink $sink$amount) {
            
$source->TransferFunds($sink,$amount);
        }
    }
    
    
/** 
    * Run the context and display the change in values
    */
    
$checking = new Account(1000);
    
$savings = new FeeAccount(500);
    
    echo 
"<h3>Initialization Test:</h3>";
    echo 
"Checking Account: $" $checking->GetBalance() . "<br />";
    echo 
"Savings Account: $" $savings->GetBalance() . "<br /><br />";
    
    
$tm_ctx = new TransferCtx();
    
$tm_ctx->Execute($checking$savings500);
    
    echo 
"<h3>Transaction Test:</h3>";
    echo 
"Checking Account: $" $checking->GetBalance() . "<br />";
    echo 
"Savings Account: $" $savings->GetBalance() . "<br /><br />";
    
    echo 
"<h3>Insufficient Funds Exception Test</h3>";
    echo 
"Insufficient Funds Test:<br />";
    
$tm_ctx->Execute($checking$savings1000);
?>