ch13.htm

corba比较入门级的介绍详细间接了corba访问发布各种细节。

<TT>37:     public float balance() {</TT>
<TT>38: </TT>
<TT>39:         return myAccount.balance();</TT>
<TT>40:     }</TT>
<TT>41: </TT>
<TT>42:     public Customer[] getCustomers() {</TT>
<TT>43: </TT>
<TT>44:         return myAccount.getCustomers();</TT>
<TT>45:     }</TT>
<TT>46: </TT>
<TT>47:     public float withdraw(float amount) throws</TT>
<TT>48:             InvalidAmountException, InsufficientFundsException {</TT>
<TT>49: </TT>
<TT>50:         return myAccount.withdraw(amount);</TT>
<TT>51:     }</TT>
<TT>52: </TT>
<TT>53:     public float deposit(float amount) throws</TT>
<TT>54:             InvalidAmountException {</TT>
<TT>55: </TT>
<TT>56:         return myAccount.deposit(amount);</TT>
<TT>57:     }</TT>
</FONT></PRE>
<P><TT>58: }</TT>
<H4><FONT COLOR="#000077">Listing 13.7. SavingsAccountImpl.java.</FONT></H4>
<PRE><FONT COLOR="#0066FF">
<TT> 1: // SavingsAccountImpl.java</TT>
<TT> 2: </TT>
<TT> 3: import idlGlobal.Customer;</TT>
<TT> 4: </TT>
<TT> 5: import idlGlobal.InsufficientFundsException;</TT>
<TT> 6: import idlGlobal.InvalidAmountException;</TT>
<TT> 7: </TT>
<TT> 8: public class SavingsAccountImpl extends idlGlobal.</TT>
<TT> 9:         _SavingsAccountImplBase {</TT>
<TT>10: </TT>
<TT>11:     // The AccountImpl to which most of this SavingsAccountImpl's</TT>
<TT>12:     // functionality is delegated.</TT>
<TT>13:     private AccountImpl myAccount;</TT>
<TT>14: </TT>
<TT>15:     // This account's interest rate.</TT>
<TT>16:     private float myInterestRate;</TT>
<TT>17: </TT>
<TT>18:     public SavingsAccountImpl(String accountNumber, String</TT>
<TT>19:             creationDate, float initialBalance, Customer customer,</TT>
<TT>20:             float interestRate) {</TT>
<TT>21: </TT>
<TT>22:         myAccount = new AccountImpl(accountNumber, creationDate,</TT>
<TT>23:                 initialBalance, customer);</TT>
<TT>24:         myInterestRate = interestRate;</TT>
<TT>25:     }</TT>
<TT>26: </TT>
<TT>27:     protected SavingsAccountImpl() {</TT>
<TT>28: </TT>
<TT>29:     }</TT>
<TT>30: </TT>
<TT>31:     public String accountNumber() {</TT>
<TT>32: </TT>
<TT>33:         return myAccount.accountNumber();</TT>
<TT>34:     }</TT>
<TT>35: </TT>
<TT>36:     public String creationDate() {</TT>
<TT>37: </TT>
<TT>38:         return myAccount.creationDate();</TT>
<TT>39:     }</TT>
<TT>40: </TT>
<TT>41:     public float balance() {</TT>
<TT>42: </TT>
<TT>43:         return myAccount.balance();</TT>
<TT>44:     }</TT>
<TT>45: </TT>
<TT>46:     public Customer[] getCustomers() {</TT>
<TT>47: </TT>
<TT>48:         return myAccount.getCustomers();</TT>
<TT>49:     }</TT>
<TT>50: </TT>
<TT>51:     public float withdraw(float amount) throws</TT>
<TT>52:             InvalidAmountException, InsufficientFundsException {</TT>
<TT>53: </TT>
<TT>54:         return myAccount.withdraw(amount);</TT>
<TT>55:     }</TT>
<TT>56: </TT>
<TT>57:     public float deposit(float amount) throws</TT>
<TT>58:             InvalidAmountException {</TT>
<TT>59: </TT>
<TT>60:         return myAccount.deposit(amount);</TT>
<TT>61:     }</TT>
<TT>62: </TT>
<TT>63:     public float interestRate() {</TT>
<TT>64: </TT>
<TT>65:         return myInterestRate;</TT>
<TT>66:     }</TT>
<TT>67: </TT>
<TT>68:     public float setInterestRate(float rate) throws</TT>
<TT>69:             InvalidAmountException {</TT>
<TT>70: </TT>
<TT>71:         // Disallow negative interest rates and throw an exception</TT>
<TT>72:         // if this is attempted.</TT>
<TT>73:         if (rate &lt; 0.0) {</TT>
<TT>74: </TT>
<TT>75:             throw new InvalidAmountException();</TT>
<TT>76:         }</TT>
<TT>77: </TT>
<TT>78:         float oldInterestRate = myInterestRate;</TT>
<TT>79:         myInterestRate = rate;</TT>
<TT>80:         return oldInterestRate;</TT>
<TT>81:     }
82: }</TT></FONT></PRE>
<H4><FONT COLOR="#000077">Listing 13.8. BankImpl.java.</FONT></H4>
<PRE><FONT COLOR="#0066FF">
<TT>  1: // BankImpl.java</TT>
<TT>  2: </TT>
<TT>  3: import java.text.SimpleDateFormat;</TT>
<TT>  4: import java.util.Date;</TT>
<TT>  5: import java.util.Enumeration;</TT>
<TT>  6: import java.util.Vector;</TT>
<TT>  7: </TT>
<TT>  8: import idlGlobal.Account;</TT>
<TT>  9: import idlGlobal.ATMCard;</TT>
<TT> 10: import idlGlobal.Customer;</TT>
<TT> 11: </TT>
<TT> 12: import idlGlobal.InvalidAccountException;</TT>
<TT> 13: </TT>
<TT> 14: import util.CORBAAlgorithms;</TT>
<TT> 15: </TT>
<TT> 16: public class BankImpl extends idlGlobal._BankImplBase {</TT>
<TT> 17: </TT>
<TT> 18:     // This Bank's name.</TT>
<TT> 19:     private String myName;</TT>
<TT> 20: </TT>
<TT> 21:     // This Bank's address.</TT>
<TT> 22:     private String myAddress;</TT>
<TT> 23: </TT>
<TT> 24:     // This Bank's list of Accounts.</TT>
<TT> 25:     Vector myAccounts;</TT>
<TT> 26: </TT>
<TT> 27:     // This Bank's list of Accounts that are subscribed to the</TT>
<TT> 28:     // automatic account update service.</TT>
<TT> 29:     Vector mySubscribedAccounts;</TT>
<TT> 30: </TT>
<TT> 31:     // This Bank's next Account number to assign.</TT>
<TT> 32:     int myNextAccountNumber;</TT>
<TT> 33: </TT>
<TT> 34:     public BankImpl(String name) {</TT>
<TT> 35: </TT>
<TT> 36:         myName = new String(name);</TT>
<TT> 37:         myAddress = new String(&quot;123 Elm Street, Anywhere USA &quot;</TT>
<TT> 38:                 + &quot;12345&quot;);</TT>
<TT> 39:         myNextAccountNumber = 0;</TT>
<TT> 40:         myAccounts = new Vector();</TT>
<TT> 41:         mySubscribedAccounts = new Vector();</TT>
<TT> 42: </TT>
<TT> 43:         Thread updateThread = new</TT>
<TT> 44:                 UpdateAccountThread(mySubscribedAccounts);</TT>
<TT> 45:         updateThread.start();</TT>
<TT> 46:     }</TT>
<TT> 47: </TT>
<TT> 48:     private BankImpl() {</TT>
<TT> 49: </TT>
<TT> 50:         myName = new String();</TT>
<TT> 51:         myAddress = new String();</TT>
<TT> 52:         myAccounts = new Vector();</TT>
<TT> 53:         mySubscribedAccounts = new Vector();</TT>
<TT> 54:         myNextAccountNumber = 0;</TT>
<TT> 55:     }</TT>
<TT> 56: </TT>
<TT> 57:     public void name(String name) {</TT>
<TT> 58: </TT>
<TT> 59:         myName = new String(name);</TT>
<TT> 60:     }</TT>
<TT> 61: </TT>
<TT> 62:     public String name() {</TT>
<TT> 63:  </TT>
<TT> 64:         return myName;</TT>
<TT> 65:     }</TT>
<TT> 66: </TT>
<TT> 67:     public void address(String address) {</TT>
<TT> 68: </TT>
<TT> 69:         myAddress = new String(address);</TT>
<TT> 70:     }</TT>
<TT> 71: </TT>
<TT> 72:     public String address() {</TT>
<TT> 73: </TT>
<TT> 74:         return myAddress;</TT>
<TT> 75:     }</TT>
<TT> 76: </TT>
<TT> 77:     public Account createAccount(Customer customer, String</TT>
<TT> 78:             accountType, float openingBalance) {</TT>
<TT> 79: </TT>
<TT> 80:         Account newAccount;</TT>
<TT> 81: </TT>
<TT> 82:         if (accountType.compareTo(&quot;savings&quot;) == 0) {</TT>
<TT> 83: </TT>
<TT> 84:             // Create a new SavingsAccountImpl object for the</TT>
<TT> 85:             // Account.</TT>
<TT> 86:             System.out.println(&quot;BankImpl: Creating new &quot; +</TT>
<TT> 87:                     &quot;SavingsAccount for Customer &quot; + customer.</TT>
<TT> 88:                     name() + &quot;.&quot;);</TT>
<TT> 89:             newAccount = new</TT>
<TT> 90:                     SavingsAccountImpl(getNextAccountNumber(),</TT>
<TT> 91:                     getCurrentDate(), openingBalance, customer,</TT>
<TT> 92:                     10.0f);</TT>
<TT> 93:         } else if (accountType.compareTo(&quot;checking&quot;) == 0) {</TT>
<TT> 94: </TT>
<TT> 95:             // Create a new CheckingAccountImpl object for the</TT>
<TT> 96:             // Account.</TT>
<TT> 97:             System.out.println(&quot;BankImpl: Creating new &quot; +</TT>
<TT> 98:                     &quot;CheckingAccount for Customer &quot; + customer.</TT>
<TT> 99:                     name() + &quot;.&quot;);</TT>
<TT>100:             newAccount = new</TT>
<TT>101:                     CheckingAccountImpl(getNextAccountNumber(),</TT>
<TT>102:                     getCurrentDate(), openingBalance, customer);</TT>
<TT>103:         } else {</TT>
<TT>104: </TT>
<TT>105:             // Invalid Account type; do nothing.</TT>
<TT>106:             System.out.println(&quot;BankImpl: Customer &quot; + customer.</TT>
<TT>107:                     name() + &quot; requested invalid Account type \&quot;&quot; +</TT>
<TT>108:                     accountType + &quot;\&quot;.&quot;);</TT>
<TT>109:             return null;</TT>
<TT>110:         }</TT>
<TT>111: </TT>
<TT>112:         // Add the created Account at the end of the list and</TT>
<TT>113:         // return it.</TT>
<TT>114:         BankMain.myBOA.obj_is_ready(newAccount);</TT>
<TT>115:         myAccounts.addElement(newAccount._duplicate());</TT>
<TT>116:         return newAccount;</TT>
<TT>117:     }</TT>
<TT>118: </TT>
<TT>119:     public void deleteAccount(Account account) throws</TT>
<TT>120:             InvalidAccountException {</TT>
<TT>121: </TT>
<TT>122:         if (!CORBAAlgorithms.contains(myAccounts, account)) {</TT>
<TT>123: </TT>
<TT>124:             // Invalid Account; throw an exception.</TT>
<TT>125:             System.out.println(&quot;BankImpl: Attempted to delete &quot; +</TT>
<TT>126:                     &quot;invalid Account.&quot;);</TT>
<TT>127:             throw new InvalidAccountException();</TT>
<TT>128:         }</TT>
<TT>129: </TT>
<TT>130:         System.out.println(&quot;BankImpl: Deleting Account \&quot;&quot; +</TT>
<TT>131:                 account.accountNumber() + &quot;\&quot;.&quot;);</TT>
<TT>132: </TT>
<TT>133:         // Delete the given Account.</TT>
<TT>134:         CORBAAlgorithms.removeElement(myAccounts, account);</TT>
<TT>135:         account._release();</TT>
<TT>136:     }</TT>
<TT>137:  </TT>
<TT>138:     public Account[] getAccounts() {</TT>
<TT>139: </TT>
<TT>140:         Account[] list = new Account[myAccounts.size()];</TT>
<TT>141:         myAccounts.copyInto(list);</TT>
<TT>142: </TT>
<TT>143:         Enumeration e = myAccounts.elements();</TT>
<TT>144:         while (e.hasMoreElements()) {</TT>
<TT>145:             ((Account)e.nextElement())._duplicate();</TT>
<TT>146:         }</TT>
<TT>147: </TT>
<TT>148:         return list;</TT>
<TT>149:     }</TT>
<TT>150: </TT>
<TT>151:     public ATMCard issueATMCard(short pin, Account account) throws</TT>
<TT>152:             InvalidAccountException {</TT>
<TT>153: </TT>
<TT>154:         // First check to see if the Account is with this Bank.</TT>
<TT>155:         if (!CORBAAlgorithms.contains(myAccounts, account)) {</TT>
<TT>156: </TT>
<TT>157:             // Invalid Account; throw an exception.</TT>
<TT>158:             System.out.println(&quot;BankImpl: Attempted to delete &quot; +</TT>
<TT>159:                     &quot;invalid Account.&quot;);</TT>
<TT>160:             throw new InvalidAccountException();</TT>
<TT>161:         }</TT>
<TT>162: </TT>
<TT>163:         // If we got this far, the Account must exist with this</TT>
<TT>164:         // Bank, so we can proceed.</TT>
<TT>165:         ATMCard newCard = new ATMCardImpl(pin, account);</TT>
<TT>166:         BankMain.myBOA.obj_is_ready(newCard);</TT>
<TT>167: </TT>
<TT>168:         System.out.println(&quot;BankImpl: Issuing new ATMCard on &quot; +</TT>
<TT>169:                 &quot;Account &quot; + account.accountNumber());</TT>
<TT>170:         newCard._duplicate();</TT>
<TT>171:         return newCard;</TT>
<TT>172:     }</TT>
<TT>173: </TT>