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public
class MoneyTransferServiceTransact
ionScriptImpl
implements MoneyTransferService {
private AccountDao accountDao;
private BankingTransactionRepository
bankingTransactionRepository;
. . .
@Override
public BankingTransaction transfer(
String fromAccountId, String toAccountId,
double amount) {
Account fromAccount = accountDao.findById
(fromAccountId);
Account toAccount = accountDao.findById(toA
ccountId);
. . .
double newBalance = fromAccount.getBalance()
- amount;
switch (fromAccount.getOverdraftPolicy()) {
case NEVER:
if (newBalance < 0) {
throw new DebitException("Insufficient
funds");
}
break;
case ALLOWED:
if (newBalance < -limit) {
throw new DebitException(
"Overdraft limit (of " + limit + ")
exceeded:
" + newBalance);
}
break;
}
fromAccount.setBalance(newBalance);
toAccount.setBalance(toAccount.getBalance()
+ amount);
BankingTransaction moneyTransferTransaction
=
new MoneyTranferTransaction(fromAccountId,
toAccountId, amount);
bankingTransactionRepository.addTransaction
(moneyTransferTransaction);
return moneyTransferTransaction;
}
} |
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because you can, doesn¡¯t mean you should¡±¡£Ëµ¾ä²»ºÃÌýµÄ£¬ÕýÊÇÓÐÕâô¶à¡°Ã»ÓÐ×·Ç󡱡¢¡°²»ÇóÉϽø¡±µÄÂëÅ©²ÅÔì³ÉÁËÓ¦ÓÃϵͳµÄ»ìÂÒ¡¢°Ü»µÁËÓ¦Óÿª·¢µÄÃûÉù¡£ÕâÒ²ÊÇΪʲôºÜ¶àÓ¦Óÿª·¢¹¤³Ìʦ¾õµÃ¹¤×÷ûÒâ˼£¬¼¼Êõº¬Á¿µÍ£¬¾õµÃÕûÌì¾ÍÊÇдif-elseµÄÒµÎñÂß¼´úÂ룬ϵͳÓÖÀ㬹¤×÷·±Ëö¡¢ÎÞÁÄ¡¢Ã»Óгɳ¤¡¢Ã»Óгɾ͸У¬ËùÒÔתÏòÈ¥×öÖмä¼þ°¡£¬È¥Ð´JDK°¡£¬¾õµÃÄǸöNB¡£Êµ¼ÊÉÏ£¬Ó¦Óÿª·¢Ò»µã¶¼²»¼òµ¥Ò²²»ÎÞÁÄ£¬ÒµÎñµÄ±ä»¯±Èµ×²ãInfrastructureµÄ±ä»¯Òª¶àµÃ¶à£¬½â¾öµÄÄѶÈҲ˿ºÁ²»±Èдµ×²ã´úÂëÈÝÒ×£¬Ö»ÊǺܶàÈËÑ¡ÔñÁËÓÃÎÞÁĵķ½Ê½È¥×ö¡£ÆäʵÎÒÃÇÊÇÓа취×öµÄ¸üÓÅÑŵģ¬ÕâÖÖÓÅÑŵķ½Ê½¾ÍÊÇÁìÓò½¨Ä££¬Î¨ÓÐÕÆÎÕÁËÕâÖÖÓÅÑÅÄã²ÅÄÜʵÏÖ´Ó¹¤³ÌʦÏòÓ¦Óüܹ¹µÄתÐÍ¡£Í¬ÑùµÄÒµÎñÂß¼£¬½ÓÏÂÀ´¾ÍÈÃÎÒÃÇ¿´Ò»ÏÂÓÃDDDÊÇÔõô×öµÄ¡£
ÒøÐÐתÕËÁìÓòÄ£ÐÍʵÏÖ
Èç¹ûÓÃDDDµÄ·½Ê½ÊµÏÖ£¬AccountʵÌå³ýÁËÕ˺ÅÊôÐÔÖ®Í⣬»¹°üº¬ÁËÐÐΪºÍÒµÎñÂß¼£¬±ÈÈçdebit(
)ºÍcredit( )·½·¨¡£
//
@Entity
public class Account {
// @Id
private String id;
private double balance;
private OverdraftPolicy overdraftPolicy;
. . .
public double balance() { return balance; }
public void debit(double amount) {
this.overdraftPolicy.preDebit(this, amount);
this.balance = this.balance - amount;
this.overdraftPolicy.postDebit(this, amount);
}
public void credit(double amount) {
this.balance = this.balance + amount;
}
} |
¶øÇÒ͸֧²ßÂÔOverdraftPolicyÒ²²»½ö½öÊÇÒ»¸öEnumÁË£¬¶øÊDZ»³éÏó³É°üº¬ÁËÒµÎñ¹æÔò²¢²ÉÓÃÁ˲ßÂÔģʽµÄ¶ÔÏó¡£
public
interface OverdraftPolicy {
void preDebit(Account account, double amount);
void postDebit(Account account, double amount);
}
public class NoOverdraftAllowed implements OverdraftPolicy
{
public void preDebit(Account account, double
amount) {
double newBalance = account.balance() - amount;
if (newBalance < 0) {
throw new DebitException("Insufficient
funds");
}
}
public void postDebit(Account account, double
amount) {
}
}
public class LimitedOverdraft implements OverdraftPolicy
{
private double limit;
. . .
public void preDebit(Account account, double
amount) {
double newBalance = account.balance() - amount;
if (newBalance < -limit) {
throw new DebitException(
"Overdraft limit (of " + limit + ")
exceeded: " + newBalance);
}
}
public void postDebit(Account account, double
amount) {
}
} |
¶øDomain ServiceÖ»ÐèÒªµ÷ÓÃDomain Entity¶ÔÏóÍê³ÉÒµÎñÂß¼¼´¿É¡£
public
class MoneyTransferServiceDomainModelImpl
implements MoneyTransferService {
private AccountRepository accountRepository;
private BankingTransactionRepository bankingTrans
actionRepository;
. . .
@Override
public BankingTransaction transfer(
String fromAccountId, String toAccountId, double
amount)
{Account fromAccount
= accountRepository.findById
(fromAccountId);
Account toAccount = accountRepository.findById
(toAccountId);
. . .
fromAccount.debit(amount);
toAccount.credit(amount);
BankingTransaction moneyTransferTransaction
=
new MoneyTranferTransaction(fromAccountId,
toAccountId, amount);
bankingTransactionRepository.addTransaction
(moneyTransferTransaction);
return moneyTransferTransaction;
}
} |
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