java qr code Depositing into accounts in Java

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Depositing into accounts
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Example: the banking system
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[AccountSimpleImpl.debit(..)] SavingsAccount(1) 500.0 Before: 1000.0 Debiting After: 500.0 from the [AccountSimpleImpl.debit(..)] SavingsAccount(1) 480.0 savings account Before: 500.0 After: 20.0 [AccountSimpleImpl.debit(..)] CheckingAccount(2) 500.0 Before: 1000.0 Debiting After: 500.0 from the [AccountSimpleImpl.debit(..)] CheckingAccount(2) 480.0 checking Before: 500.0 account directly After: 20.0 [AccountSimpleImpl.debit(..)] CheckingAccount(2) 100.0 Before: 20.0 After: 20.0 banking.InsufficientBalanceException: Total balance not sufficient [CheckClearanceSystem.debit(..)] CheckingAccount(2) 400.0 Before: 20.0 [AccountSimpleImpl.debit(..)] CheckingAccount(2) 400.0 Before: 20.0 After: 20.0 After: 20.0 banking.InsufficientBalanceException: Total balance not sufficient [CheckClearanceSystem.debit(..)] CheckingAccount(2) 600.0 Before: 20.0 [AccountSimpleImpl.debit(..)] CheckingAccount(2) 600.0 Before: 20.0 Debiting from the checking account After: 20.0 through the check clearance system After: 20.0 banking.InsufficientBalanceException: Total balance not sufficient
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We see from the output that neither a minimum balance nor the overdraft protection rule is applied. $1000 is deposited to each account. Because both accounts started with a zero balance, they now each have $1000. The savings account is debited $500. This transaction is successful because the savings account has a $1000 balance. Now with $500 in the account, a debit request in the amount of $480 is made. This transaction also completes, leaving the savings account with a $20 balance. The request to debit $500 from the checking account is followed by a request to debit $480. Both transactions are successful because the account had $1000 initially. Now with a $20 balance in the checking account, a debit request in the amount of $100 is made. The withdrawal amount is less than the available balance, so we see that the transaction has thrown an InsufficientBalanceException. The check clearance system debits $400, followed by $600. Because the checking account had only $20 to begin with, both these operations result in throwing an InsufficientBalanceException.
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Implementing business rules
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Let s compile the banking classes with the aspects containing the business rules. We now expect both the minimum balance and overdraft protection rules to be applied:
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> ajc banking\*.java logging\*.java rule\common\*.java rule\java\*.java > java banking.Test [AccountSimpleImpl.credit(..)] SavingsAccount(1) 1000.0 Before: 0.0 Depositing After: 1000.0 into [AccountSimpleImpl.credit(..)] CheckingAccount(2) 1000.0 accounts Before: 0.0 After: 1000.0 [AccountSimpleImpl.debit(..)] SavingsAccount(1) 500.0 Exercising the Before: 1000.0 minimum After: 500.0 balance rule [AccountSimpleImpl.debit(..)] SavingsAccount(1) 480.0 for the savings Before: 500.0 account After: 500.0 banking.InsufficientBalanceException: Minimum balance condition not met [AccountSimpleImpl.debit(..)] CheckingAccount(2) 500.0 Exercising Before: 1000.0 the minimum After: 500.0 balance rule [AccountSimpleImpl.debit(..)] CheckingAccount(2) 480.0 for the Before: 500.0 checking After: 20.0 account [AccountSimpleImpl.debit(..)] CheckingAccount(2) 100.0 Before: 20.0 After: 20.0 banking.InsufficientBalanceException: Total balance not sufficient [CheckClearanceSystem.debit(..)] CheckingAccount(2) 400.0 Before: 20.0 [AccountSimpleImpl.debit(..)] CheckingAccount(2) 400.0 Before: 20.0 [AccountSimpleImpl.debit(..)] SavingsAccount(1) 380.0 Before: 500.0 After: 120.0 [AccountSimpleImpl.credit(..)] CheckingAccount(2) 380.0 Before: 20.0 After: 400.0 Exercising After: 0.0 the overdraft After: 0.0 protection [CheckClearanceSystem.debit(..)] CheckingAccount(2) 600.0 rule Before: 0.0 [AccountSimpleImpl.debit(..)] CheckingAccount(2) 600.0 Before: 0.0 After: 0.0 After: 0.0 banking.InsufficientBalanceException: Insufficient funds in overdraft accounts
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Implementing business rules with a rule engine
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Each account receives a deposit of $1000. This block illustrates the effect of the minimum balance rule, which ensures that the savings accounts balance does not fall below $25. After a request to debit $500, the account has a $500 balance. The subsequent request to debit $480 would leave a balance of $20, which is less than the minimum balance requirement. We see that the rule that rejects the second debit request is applied. This block shows that the minimum balance requirement does not apply to the checking accounts. Therefore, the request to debit $480 that will result in leaving a $20 balance is fulfilled successfully. This block shows that the overdraft protection is not applied unless the debit request is made through the check clearance system. We see that debiting $100 from the checking account (which has a $20 balance) results in throwing an InsufficientBalanceException. With the checking account having a $20 balance and the savings account having $500, the check clearance system requests a $400 debit. We now see that the overdraft protection logic is performed. First, $380 is transferred from the savings account (which was designated to be the overdraft account). This leaves the checking account with $400 just enough to fulfill the debit requests. In the end, the checking account is left with a zero balance. We now observe another request to debit $600 coming in. The overdraft protection logic is applied; however, because the savings account also does not have enough money, it throws an exception. Now we have a simple way to implement business rules for our banking system without touching any of the core classes. In the next section, we implement the same rules using a rule engine and aspects.
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