ch09.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>17:         myName(strdup(name)),</TT>
<TT>18:         mySocialSecurityNumber(strdup(socialSecurityNumber)),</TT>
<TT>19:         myAddress(strdup(address)),</TT>
<TT>20:         myMothersMaidenName(strdup(mothersMaidenName)),</TT>
<TT>21:         myAccounts(), myATMCards() {</TT>
<TT>22: </TT>
<TT>23: }</TT>
<TT>24: </TT>
<TT>25: // Default constructor.</TT>
<TT>26: CustomerImpl::CustomerImpl() : myName(NULL),</TT>
<TT>27:         mySocialSecurityNumber(NULL), myAddress(NULL),</TT>
<TT>28:         myMothersMaidenName(NULL), myAccounts(), myATMCards() {</TT>
<TT>29: </TT>
<TT>30: }</TT>
<TT>31: </TT>
<TT>32: // Destructor.</TT>
<TT>33: CustomerImpl::~CustomerImpl() {</TT>
<TT>34: </TT>
<TT>35:     free(myName);</TT>
<TT>36:     free(mySocialSecurityNumber);</TT>
<TT>37:     free(myAddress);</TT>
<TT>38:     free(myMothersMaidenName);</TT>
<TT>39: }</TT>
<TT>40: </TT>
<TT>41: char* CustomerImpl::name() {</TT>
<TT>42: </TT>
<TT>43:     return CORBA::strdup(myName);</TT>
<TT>44: }</TT>
<TT>45: </TT>
<TT>46: void CustomerImpl::name(const char* val) {</TT>
<TT>47: </TT>
<TT>48:     free(myName);</TT>
<TT>49:     myName = strdup(val);</TT>
<TT>50: }</TT>
<TT>51: </TT>
<TT>52: char* CustomerImpl::socialSecurityNumber() {</TT>
<TT>53: </TT>
<TT>54:     return CORBA::strdup(mySocialSecurityNumber);</TT>
<TT>55: }</TT>
<TT>56: </TT>
<TT>57: char* CustomerImpl::address() {</TT>
<TT>58: </TT>
<TT>59:     return CORBA::strdup(myAddress);</TT>
<TT>60: }</TT>
<TT>61: </TT>
<TT>62: void CustomerImpl::address(const char* val) {</TT>
<TT>63: </TT>
<TT>64:     free(myAddress);</TT>
<TT>65:     myAddress = strdup(val);</TT>
<TT>66: }</TT>
<TT>67: </TT>
<TT>68: char* CustomerImpl::mothersMaidenName() {</TT>
<TT>69: </TT>
<TT>70:     return CORBA::strdup(myMothersMaidenName);</TT>
<TT>71: }</TT>
<TT>72: </TT>
<TT>73: AccountList* CustomerImpl::getAccounts() {</TT>
<TT>74: </TT>
<TT>75:     return &amp;myAccounts;</TT>
<TT>76: }</TT>
<TT>77: </TT>
<B><TT>78: void CustomerImpl::updateAccountBalance(Account_ptr account,</TT></B>
<B><TT>79:         CORBA::Float balance) {</TT></B>
<B><TT>80: </TT></B>
<B><TT>81:     cout &lt;&lt; &quot;CustomerImpl: Received account update:&quot; &lt;&lt; endl &lt;&lt;</TT></B>
<B><TT>82:             &quot;  New balance is $&quot; &lt;&lt; balance &lt;&lt; endl;
</TT></B><TT>83: }</TT></FONT></PRE>
<H3><A NAME="Heading8"></A><FONT COLOR="#000077">Enhancing the ATMClient</FONT></H3>
<P>The modifications to <TT>ATMClientMain.cpp</TT> are easy to follow (see Listing
9.7). The only additions are that the <TT>ATMClient</TT> now requests the account
update service from the <TT>Bank</TT> when the <TT>Account</TT> is created, and when
the <TT>ATMClient</TT> is finished, it waits for two minutes to give the <TT>Bank</TT>
a chance to call <TT>updateAccountBalance()</TT> once or twice before the <TT>ATMClient</TT>
exits. (Like <TT>BankImpl</TT>, <TT>ATMClient</TT> uses the Win32 API to cause the
current thread to sleep; again, non-Windows developers need to substitute the appropriate
method call here.)
<H4><FONT COLOR="#000077">Listing 9.7. ATMClientMain.cpp.</FONT></H4>
<PRE><FONT COLOR="#0066FF"><TT>  1: // ATMClientMain.cpp</TT>
<TT>  2: </TT>
<TT>  3: #include &lt;iostream.h&gt;</TT>
<TT>  4: #include &lt;stdlib.h&gt;</TT>
<TT>  5: </TT>
<TT>  6: #include &quot;../Customer/CustomerImpl.h&quot;</TT>
<TT>  7: </TT>
<TT>  8: #include &quot;../Bank_c.h&quot;</TT>
<TT>  9: #include &quot;../BankServer_c.h&quot;</TT>
<TT> 10: #include &quot;../ATM_c.h&quot;</TT>
<TT> 11: </TT>
<TT> 12: int main(int argc, char *const *argv) {</TT>
<TT> 13: </TT>
<TT> 14:     // Check the number of arguments; there should be exactly five</TT>
<TT> 15:     // (six counting the executable name itself).</TT>
<TT> 16:     if (argc != 6) {</TT>
<TT> 17:         cout &lt;&lt; &quot;Usage: ATMClient &lt;name&gt; &lt;social security number&gt;&quot;</TT>
<TT> 18:                 &quot; &lt;address&gt; &lt;mother's maiden name&gt; &lt;PIN&gt;&quot; &lt;&lt; endl;</TT>
<TT> 19:         return 1;</TT>
<TT> 20:     }</TT>
<TT> 21: </TT>
<TT> 22:     // Assign the command line arguments to the Customer attributes.</TT>
<TT> 23:     const char* name = argv[1];</TT>
<TT> 24:     const char* socialSecurityNumber = argv[2];</TT>
<TT> 25:     const char* address = argv[3];</TT>
<TT> 26:     const char* mothersMaidenName = argv[4];</TT>
<TT> 27:     CORBA::Short pin = atoi(argv[5]);</TT>
<TT> 28: </TT>
<TT> 29:     // Initialize the ORB and BOA.</TT>
<TT> 30:     CORBA::ORB_var orb = CORBA::ORB_init(argc, argv);</TT>
<TT> 31:     CORBA::BOA_var boa = orb-&gt;BOA_init(argc, argv);</TT>
<TT> 32: </TT>
<TT> 33:     // Create a Customer object.</TT>
<TT> 34:     cout &lt;&lt; &quot;ATMClient: Creating new Customer:&quot; &lt;&lt; endl;</TT>
<TT> 35:     cout &lt;&lt; &quot;  name: &quot; &lt;&lt; name &lt;&lt; endl;</TT>
<TT> 36:     cout &lt;&lt; &quot;  Social Security number: &quot; &lt;&lt; socialSecurityNumber &lt;&lt;</TT>
<TT> 37:             endl;</TT>
<TT> 38:     cout &lt;&lt; &quot;  address: &quot; &lt;&lt; address &lt;&lt; endl;</TT>
<TT> 39:     cout &lt;&lt; &quot;  mother's maiden name: &quot; &lt;&lt; mothersMaidenName &lt;&lt; endl;</TT>
<TT> 40:     CustomerImpl customer(name, socialSecurityNumber, address,</TT>
<TT> 41:             mothersMaidenName);</TT>
<TT> 42: </TT>
<TT> 43:     // Notify the BOA that the CustomerImpl object is ready.</TT>
<TT> 44:     boa-&gt;obj_is_ready(&amp;customer);</TT>
<TT> 45: </TT>
<TT> 46:     // Locate a BankServer object and try to get a list of Banks</TT>
<TT> 47:     // and ATMs from it.</TT>
<TT> 48:     BankServer_var bankServer;</TT>
<TT> 49:     try {</TT>
<TT> 50:         bankServer = BankServer::_bind();</TT>
<TT> 51:     } catch (const CORBA::Exception&amp; ex) {</TT>
<TT> 52: </TT>
<TT> 53:         // The bind attempt failed...</TT>
<TT> 54:         cout &lt;&lt; &quot;ATMClient: Unable to bind to a BankServer:&quot; &lt;&lt;</TT>
<TT> 55:                 endl;</TT>
<TT> 56:         cout &lt;&lt; ex &lt;&lt; endl;</TT>
<TT> 57:         return 1;</TT>
<TT> 58:     }</TT>
<TT> 59:     cout &lt;&lt; &quot;ATMClient: Successfully bound to a BankServer.&quot; &lt;&lt;</TT>
<TT> 60:             endl;</TT>
<TT> 61: </TT>
<TT> 62:     BankList_ptr banks;</TT>
<TT> 63:     ATMList_ptr ATMs;</TT>
<TT> 64: </TT>
<TT> 65:     try {</TT>
<TT> 66:         banks = bankServer-&gt;getBanks();</TT>
<TT> 67:         ATMs = bankServer-&gt;getATMs();</TT>
<TT> 68:     } catch (const CORBA::Exception&amp; ex) {</TT>
<TT> 69: </TT>
<TT> 70:         // The attempt failed...</TT>
<TT> 71:         cout &lt;&lt; &quot;ATMClient: Unable to get lists of Banks and ATMs:&quot;</TT>
<TT> 72:                 &lt;&lt; endl;</TT>
<TT> 73:         cout &lt;&lt; ex &lt;&lt; endl;</TT>
<TT> 74:         return 1;</TT>
<TT> 75:     }</TT>
<TT> 76: </TT>
<TT> 77:     // Use the first Bank and the first ATM that appear in the</TT>
<TT> 78:     // lists.</TT>
<TT> 79:     if (banks-&gt;length() == 0) {</TT>
<TT> 80: </TT>
<TT> 81:         // No Banks were available.</TT>
<TT> 82:         cout &lt;&lt; &quot;ATMClient: No Banks available.&quot; &lt;&lt; endl;</TT>
<TT> 83:         return 1;</TT>
<TT> 84:     }</TT>
<TT> 85:     if (ATMs-&gt;length() == 0) {</TT>
<TT> 86: </TT>
<TT> 87:         // No ATMs were available.</TT>
<TT> 88:         cout &lt;&lt; &quot;ATMClient: No ATMs available.&quot; &lt;&lt; endl;</TT>
<TT> 89:         return 1;</TT>
<TT> 90:     }</TT>
<TT> 91:     Bank_var bank = (*banks)[0];</TT>
<TT> 92:     ATM_var atm = (*ATMs)[0];</TT>
<TT> 93:     cout &lt;&lt; &quot;ATMClient: Using Bank \&quot;&quot; &lt;&lt; bank-&gt;name() &lt;&lt; &quot;\&quot; and&quot;</TT>
<TT> 94:             &lt;&lt; &quot; ATM \&quot;&quot; &lt;&lt; atm-&gt;name() &lt;&lt; &quot;\&quot;.&quot; &lt;&lt; endl;</TT>
<TT> 95: </TT>
<TT> 96:     // Do some cool stuff.</TT>
<TT> 97: </TT>
<TT> 98:     Account_var account;</TT>
<TT> 99:     ATMCard_var atmCard;</TT>
<TT>100: </TT>
<TT>101:     try {</TT>
<TT>102:         account = bank-&gt;createAccount(&amp;customer, &quot;checking&quot;, 0.0);</TT>
<TT>103:     } catch (const CORBA::Exception&amp; ex) {</TT>
<TT>104: </TT>
<TT>105:         // The createAccount() attempt failed...</TT>
<TT>106:         cout &lt;&lt; &quot;ATMClient: Unable to create Account.&quot; &lt;&lt; endl;</TT>
<TT>107:         cout &lt;&lt; ex &lt;&lt; endl;</TT>
<TT>108:         return 1;</TT>
<TT>109:     }</TT>
<TT>110: </TT>
<B><TT>111:     try {</TT></B>
<B><TT>112: </TT></B>
<B><TT>113:         // Request the automatic account update service from the</TT></B>
<B><TT>114:         // Bank.</TT></B>
<B><TT>115:         bank-&gt;requestUpdateService(account);</TT></B>
<B><TT>116:     } catch (const CORBA::Exception&amp; ex) {</TT></B>
<B><TT>117: </TT></B>
<B><TT>118:         // The requestUpdateService() attempt failed...</TT></B>
<B><TT>119:         cout &lt;&lt; &quot;ATMClient: Unable to create Account.&quot; &lt;&lt; endl;</TT></B>
<B><TT>120:         cout &lt;&lt; ex &lt;&lt; endl;</TT></B>
<B><TT>121:         return 1;</TT></B>
<B><TT>122:     }</TT></B>
<TT>123: </TT>
<TT>124:     try {</TT>
<TT>125: </TT>
<TT>126:         // Print out some Account statistics.</TT>
<TT>127:         cout &lt;&lt; &quot;ATMClient: Opened new Account:&quot; &lt;&lt; endl;</TT>
<TT>128:         cout &lt;&lt; &quot;  account number: &quot; &lt;&lt; account-&gt;accountNumber() &lt;&lt;</TT>
<TT>129:                 endl;</TT>
<TT>130:         cout &lt;&lt; &quot;  creation date: &quot; &lt;&lt; account-&gt;creationDate() &lt;&lt;</TT>
<TT>131:                 endl;</TT>
<TT>132:         cout &lt;&lt; &quot;  account balance: &quot; &lt;&lt; account-&gt;balance() &lt;&lt; endl;</TT>
<TT>133: </TT>
<TT>134:         // Ask the Bank to issue an ATMCard for the newly-created</TT>
<TT>135:         // Account.</TT>
<TT>136:         cout &lt;&lt; &quot;ATMClient: Getting ATMCard from Bank.&quot; &lt;&lt; endl;</TT>
<TT>137:         try {</TT>
<TT>138:             atmCard = bank-&gt;issueATMCard(pin, account);</TT>
<TT>139:         } catch (const InvalidAccountException&amp;) {</TT>
<TT>140: </TT>
<TT>141:             // For some reason, the Account was invalid (this</TT>
<TT>142:             // shouldn't happen).</TT>
<TT>143:             cout &lt;&lt; &quot;ATMClient: Exception caught: Invalid Account&quot;</TT>
<TT>144:                     &lt;&lt; endl;</TT>
<TT>145:             return 1;</TT>
<TT>146:         }</TT>
<TT>147: </TT>
<TT>148:         // Perform some transactions on the Account through the</TT>
<TT>149:         // ATM.</TT>
<TT>150:         cout &lt;&lt; &quot;ATMClient: Performing transactions.&quot; &lt;&lt; endl;</TT>
<TT>151:         try {</TT>
<TT>152:             cout &lt;&lt; &quot;  Depositing $250.00...&quot; &lt;&lt; endl;</TT>
<TT>153:             cout &lt;&lt; &quot;  New balance is $&quot; &lt;&lt; atm-&gt;deposit(atmCard,</TT>
<TT>154:                     account, pin, 250.00) &lt;&lt; endl;</TT>
<TT>155: </TT>
<TT>156:             // This will throw an exception since we're trying to</TT>
<TT>157:             // withdraw too much.</TT>
<TT>158:             cout &lt;&lt; &quot;  Withdrawing $500.00...&quot; &lt;&lt; endl;</TT>
<TT>159:             cout &lt;&lt; &quot;  New balance is $&quot; &lt;&lt; atm-&gt;withdraw(atmCard,</TT>
<TT>160:                     account, pin, 500.00) &lt;&lt; endl;</TT>
<TT>161:         } catch (AuthorizationException&amp;) {</TT>
<TT>162:             cout &lt;&lt; &quot;ATMClient: Exception caught: Invalid PIN or &quot;</TT>
<TT>163:                     &lt;&lt; &quot;No authorization (as expected)&quot; &lt;&lt; endl;</TT>
<TT>164:         } catch (InvalidAmountException&amp;) {</TT>
<TT>165:             cout &lt;&lt; &quot;ATMClient: Exception caught: Invalid amount&quot;</TT>
<TT>166:                     &lt;&lt; endl;</TT>
<TT>167:         } catch (InsufficientFundsException&amp;) {</TT>
<TT>168:             cout &lt;&lt; &quot;ATMClient: Exception caught: Insufficient &quot; &lt;&lt;</TT>
<TT>169:                     &quot;funds&quot; &lt;&lt; endl;</TT>
<TT>170:         }</TT>
<TT>171: </TT>
<TT>172:         // Perform some more transactions on the Account through</TT>
<TT>173:         // the ATM.</TT>
<TT>174:         cout &lt;&lt; &quot;ATMClient: Performing more transactions.&quot; &lt;&lt; endl;</TT>
<TT>175:         try {</TT>
<TT>176:             cout &lt;&lt; &quot;  Depositing $500.00...&quot; &lt;&lt; endl;</TT>
<TT>177:             cout &lt;&lt; &quot;  New balance is $&quot; &lt;&lt;</TT>
<TT>178:                     atm-&gt;deposit(atmCard, account, pin, 500.00) &lt;&lt;</TT>
<TT>179:                     endl;</TT>
<TT>180: </TT>
<TT>181:             // This will throw an exception since we're using the</TT>
<TT>182:             // wrong PIN.</TT>
<TT>183:             cout &lt;&lt; &quot;  Withdrawing $250.00 with incorrect PIN...&quot;</TT>
<TT>184:                     &lt;&lt; endl;</TT>
<TT>185:             cout &lt;&lt; &quot;  New balance is $&quot; &lt;&lt; atm-&gt;withdraw(atmCard,</TT>