ch08.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>61: };</TT>
<TT>62: 
63: #endif</TT></FONT></PRE>
<H4><FONT COLOR="#000077">Listing 8.9. BankImpl.cpp.</FONT></H4>
<PRE><FONT COLOR="#0066FF"><TT>  1: // BankImpl.cpp</TT>
<TT>  2: </TT>
<TT>  3: #include &quot;BankImpl.h&quot;</TT>
<TT>  4: </TT>
<TT>  5: #include &lt;time.h&gt;</TT>
<TT>  6: #include &lt;string.h&gt;</TT>
<TT>  7: #include &lt;iostream.h&gt;</TT>
<TT>  8: #include &lt;algorithm&gt;</TT>
<TT>  9: #include &lt;functional&gt;</TT>
<TT> 10: </TT>
<TT> 11: #include &quot;SavingsAccountImpl.h&quot;</TT>
<TT> 12: #include &quot;CheckingAccountImpl.h&quot;</TT>
<B><TT> 13: #include &quot;ATMCardImpl.h&quot;</TT></B>
<TT> 14: </TT>
<TT> 15: extern CORBA::BOA_var boa;</TT>
<TT> 16: </TT>
<TT> 17: // STL-derived unary function which returns TRUE if Accounts are</TT>
<TT> 18: // equal.</TT>
<TT> 19: class IsAccountEqual : public std::unary_function&lt;Account_ptr,</TT>
<TT> 20:         bool&gt; {</TT>
<TT> 21: public:</TT>
<TT> 22:     IsAccountEqual(argument_type account) { myAccount = account; }</TT>
<TT> 23:     result_type operator()(argument_type account) { return account-&gt;</TT>
<TT> 24:             _is_equivalent(myAccount) != 0; }</TT>
<TT> 25: private:</TT>
<TT> 26:     argument_type myAccount;</TT>
<TT> 27: };</TT>
<TT> 28: </TT>
<TT> 29: // Constructor.</TT>
<TT> 30: //</TT>
<TT> 31: // name - This Bank's name.</TT>
<TT> 32: BankImpl::BankImpl(const char* name) : _sk_Bank(name), myAccounts(),</TT>
<TT> 33:         myName(strdup(name)), myAddress(strdup(&quot;123 Elm Street, &quot;</TT>
<TT> 34:         &quot;Anyware USA 12345&quot;)), myNextAccountNumber(0) {</TT>
<TT> 35: </TT>
<TT> 36: }</TT>
<TT> 37: </TT>
<TT> 38: // Default constructor.</TT>
<TT> 39: BankImpl::BankImpl() : myAccounts(), myName(NULL), myAddress(NULL),</TT>
<TT> 40:         myNextAccountNumber(0) {</TT>
<TT> 41: </TT>
<TT> 42: }</TT>
<TT> 43: </TT>
<TT> 44: // Destructor.</TT>
<TT> 45: BankImpl::~BankImpl() {</TT>
<TT> 46: </TT>
<TT> 47:     cout &lt;&lt; &quot;Bank \&quot;&quot; &lt;&lt; name() &lt;&lt; &quot;\&quot; being destroyed.&quot; &lt;&lt; endl;</TT>
<TT> 48:     free(myName);</TT>
<TT> 49:     free(myAddress);</TT>
<TT> 50: }</TT>
<TT> 51: </TT>
<TT> 52: char* BankImpl::name() {</TT>
<TT> 53: </TT>
<TT> 54:     return CORBA::strdup(myName);</TT>
<TT> 55: }</TT>
<TT> 56: </TT>
<TT> 57: void BankImpl::name(const char* val) {</TT>
<TT> 58: </TT>
<TT> 59:     free(myName);</TT>
<TT> 60:     myName = strdup(val);</TT>
<TT> 61: }</TT>
<TT> 62: </TT>
<TT> 63: char* BankImpl::address() {</TT>
<TT> 64: </TT>
<TT> 65:     return CORBA::strdup(myAddress);</TT>
<TT> 66: }</TT>
<TT> 67: </TT>
<TT> 68: void BankImpl::address(const char* val) {</TT>
<TT> 69: </TT>
<TT> 70:     free(myAddress);</TT>
<TT> 71:     myAddress = strdup(val);</TT>
<TT> 72: }</TT>
<TT> 73: </TT>
<TT> 74: Account_ptr BankImpl::createAccount(Customer_ptr customer,</TT>
<TT> 75:         const char* accountType, CORBA::Float openingBalance) {</TT>
<TT> 76: </TT>
<TT> 77:     Account_ptr newAccount;</TT>
<TT> 78: </TT>
<TT> 79:     if (strcmp(accountType, &quot;savings&quot;) == 0) {</TT>
<TT> 80: </TT>
<TT> 81:         // Create a new SavingsAccountImpl object for the Account.</TT>
<TT> 82:         cout &lt;&lt; &quot;BankImpl: Creating new SavingsAccount for &quot;</TT>
<TT> 83:                 &quot;Customer &quot; &lt;&lt; customer-&gt;name() &lt;&lt; &quot;.&quot; &lt;&lt; endl;</TT>
<TT> 84:         newAccount = new SavingsAccountImpl(getNextAccountNumber(),</TT>
<TT> 85:                 getCurrentDate(), openingBalance, customer, 10.0);</TT>
<TT> 86:     } else if (strcmp(accountType, &quot;checking&quot;) == 0) {</TT>
<TT> 87: </TT>
<TT> 88:         // Create a new CheckingAccountImpl object for the Account.</TT>
<TT> 89:         cout &lt;&lt; &quot;BankImpl: Creating new CheckingAccount for &quot;</TT>
<TT> 90:                 &quot;Customer &quot; &lt;&lt; customer-&gt;name() &lt;&lt; &quot;.&quot; &lt;&lt; endl;</TT>
<TT> 91:         newAccount = new CheckingAccountImpl(getNextAccountNumber(),</TT>
<TT> 92:                 getCurrentDate(), openingBalance, customer);</TT>
<TT> 93:     } else {</TT>
<TT> 94: </TT>
<TT> 95:         // Invalid Account type; do nothing.</TT>
<TT> 96:         cout &lt;&lt; &quot;BankImpl: Customer &quot; &lt;&lt; customer-&gt;name() &lt;&lt;</TT>
<TT> 97:                 &quot; requested invalid Account type \&quot;&quot; &lt;&lt; accountType</TT>
<TT> 98:                 &lt;&lt; &quot;\&quot;.&quot; &lt;&lt; endl;</TT>
<TT> 99:         return Account::_nil();</TT>
<TT>100:     }</TT>
<TT>101: </TT>
<TT>102:     // Add the created Account at the end of the list and return it.</TT>
<TT>103:     ::boa-&gt;obj_is_ready(newAccount);</TT>
<TT>104:     myAccounts.push_back(Account::_duplicate(newAccount));</TT>
<TT>105:     return newAccount;</TT>
<TT>106: }</TT>
<TT>107: </TT>
<TT>108: void BankImpl::deleteAccount(Account_ptr account) throw</TT>
<TT>109:         (InvalidAccountException) {</TT>
<TT>110: </TT>
<TT>111:     std::vector&lt;Account_ptr&gt;::iterator first = myAccounts.begin();</TT>
<TT>112:     std::vector&lt;Account_ptr&gt;::iterator last = myAccounts.end();</TT>
<TT>113:     IsAccountEqual predicate(account);</TT>
<TT>114: </TT>
<TT>115:     std::vector&lt;Account_ptr&gt;::iterator matchedAccount = std::</TT>
<TT>116:             find_if(first, last, predicate);</TT>
<TT>117:     if (matchedAccount == last) {</TT>
<TT>118: </TT>
<TT>119:         // Invalid Account; throw an exception.</TT>
<TT>120:         cout &lt;&lt; &quot;BankImpl: Attempted to delete invalid Account.&quot; &lt;&lt;</TT>
<TT>121:                 endl;</TT>
<TT>122:         throw InvalidAccountException();</TT>
<TT>123:     }</TT>
<TT>124:     cout &lt;&lt; &quot;BankImpl: Deleting Account \&quot;&quot; &lt;&lt; account-&gt;</TT>
<TT>125:             accountNumber() &lt;&lt; &quot;\&quot;.&quot; &lt;&lt; endl;</TT>
<TT>126: </TT>
<TT>127:     // Delete the given Account.</TT>
<TT>128:     myAccounts.erase(matchedAccount);</TT>
<TT>129:     account-&gt;_release();</TT>
<TT>130: }</TT>
<TT>131: </TT>
<TT>132: AccountList* BankImpl::getAccounts() {</TT>
<TT>133: </TT>
<TT>134:     AccountList* list = new AccountList(myAccounts.size());</TT>
<TT>135:     CORBA::Long i;</TT>
<TT>136: </TT>
<TT>137:     for (i = 0; i &lt; myAccounts.size(); i++) {</TT>
<TT>138:         (*list)[i] = Account::_duplicate(myAccounts[i]);</TT>
<TT>139:     }</TT>
<TT>140: </TT>
<TT>141:     return list;</TT>
<TT>142: }</TT>
<TT>143: </TT>
<B><TT>144: ATMCard_ptr BankImpl::issueATMCard(CORBA::Short pin, Account_ptr</TT></B>
<B><TT>145:         account) throw (InvalidAccountException) {</TT></B>
<B><TT>146: </TT></B>
<B><TT>147:     // First check to see if the Account is with this Bank.</TT></B>
<B><TT>148:     std::vector&lt;Account_ptr&gt;::iterator first = myAccounts.begin();</TT></B>
<B><TT>149:     std::vector&lt;Account_ptr&gt;::iterator last = myAccounts.end();</TT></B>
<B><TT>150:     IsAccountEqual predicate(account);</TT></B>
<B><TT>151: </TT></B>
<B><TT>152:     std::vector&lt;Account_ptr&gt;::iterator matchedAccount = std::</TT></B>
<B><TT>153:             find_if(first, last, predicate);</TT></B>
<B><TT>154:     if (matchedAccount == last) {</TT></B>
<B><TT>155: </TT></B>
<B><TT>156:         // Invalid Account; throw an exception.</TT></B>
<B><TT>157:         throw InvalidAccountException();</TT></B>
<B><TT>158:     }</TT></B>
<B><TT>159: </TT></B>
<B><TT>160:     // If we got this far, the Account must exist with this Bank,</TT></B>
<B><TT>161:     // so we can proceed.</TT></B>
<B><TT>162:     ATMCard_ptr newCard = new ATMCardImpl(pin, account);</TT></B>
<B><TT>163: </TT></B>
<B><TT>164:     return ATMCard::_duplicate(newCard);</TT></B>
<B><TT>165: }</TT></B>
<TT>166: </TT>
<TT>167: // Return the next available account number. The result is returned</TT>
<TT>168: // in a static buffer.</TT>
<TT>169: char* BankImpl::getNextAccountNumber() {</TT>
<TT>170: </TT>
<TT>171:     static char accountNumber[16] = &quot;Account        &quot;;</TT>
<TT>172: </TT>
<TT>173:     sprintf(accountNumber + 7, &quot;%08u&quot;, myNextAccountNumber++);</TT>
<TT>174: </TT>
<TT>175:     return accountNumber;</TT>
<TT>176: }</TT>
<TT>177: </TT>
<TT>178: // Return the current date in the form &quot;Mmm DD YYYY&quot;. The result is</TT>
<TT>179: // returned in a static buffer.</TT>
<TT>180: char* BankImpl::getCurrentDate() {</TT>
<TT>181: </TT>
<TT>182:     static char currentDate[12] = &quot;           &quot;;</TT>
<TT>183: </TT>
<TT>184:     time_t ltime;</TT>
<TT>185:     time(&amp;ltime);</TT>
<TT>186:     char* ctimeResult = ctime(&amp;ltime);</TT>
<TT>187: </TT>
<TT>188:     memcpy(currentDate, ctimeResult + 4, 3);</TT>
<TT>189:     memcpy(currentDate + 4, ctimeResult + 8, 2);</TT>
<TT>190:     memcpy(currentDate + 7, ctimeResult + 20, 4);</TT>
<TT>191: </TT>
<TT>192:     return currentDate;
193: }</TT> </FONT></PRE>
<P>The logic of <TT>ATMCardImpl</TT> (Listings 8.10 and 8.11) is very similar to
that in <TT>BankImpl</TT>; <TT>addAccount()</TT>, <TT>removeAccount()</TT>, and <TT>getAccounts()</TT>
are implemented in exactly the same way as they are in <TT>BankImpl</TT> (with the
exception that <TT>removeAccount()</TT> and <TT>addAccount()</TT> call <TT>isAuthorized()</TT>
to determine whether the <TT>Account</TT> is in the list of <TT>Account</TT>s, rather
than duplicate this functionality).
<H4><FONT COLOR="#000077">Listing 8.10. ATMCardImpl.h.</FONT></H4>
<PRE><FONT COLOR="#0066FF"><TT> 1: // ATMCardImpl.h</TT>
<TT> 2: </TT>
<TT> 3: #ifndef ATMCardImpl_h</TT>
<TT> 4: #define ATMCardImpl_h</TT>
<TT> 5: </TT>
<TT> 6: #include &lt;vector&gt;</TT>
<TT> 7: </TT>
<TT> 8: #include &quot;../ATMCard_s.h&quot;</TT>
<TT> 9: </TT>
<TT>10: class ATMCardImpl : public _sk_ATMCard {</TT>
<TT>11: </TT>
<TT>12: public:</TT>
<TT>13:     // Constuctor.</TT>
<TT>14:     //</TT>
<TT>15:     // pin - the initial PIN to use for this ATMCard.</TT>
<TT>16:     // initialAccount - the Account for which this ATMCard is</TT>
<TT>17:     // initially authorized.</TT>
<TT>18:     ATMCardImpl(CORBA::Short pin, Account_ptr initialAccount);</TT>
<TT>19: </TT>
<TT>20:     // Destructor.</TT>
<TT>21:     ~ATMCardImpl();</TT>
<TT>22: </TT>
<TT>23:     // These methods are described in ATMCard.idl.</TT>
<TT>24:     virtual CORBA::Boolean isAuthorized(Account_ptr account);</TT>
<TT>25:     virtual CORBA::Short pin();</TT>
<TT>26:     virtual void pin(CORBA::Short val);</TT>
<TT>27:     virtual void removeAccount(Account_ptr account) throw</TT>
<TT>28:             (InvalidAccountException);</TT>
<TT>29:     virtual void addAccount(Account_ptr account) throw</TT>
<TT>30:             (InvalidAccountException);</TT>
<TT>31:     virtual AccountList* getAccounts();</TT>
<TT>32: </TT>
<TT>33: private:</TT>
<TT>34: </TT>
<TT>35:     // Default constructor.</TT>
<TT>36:     ATMCardImpl();</TT>
<TT>37: </TT>
<TT>38:     // This ATMCard's PIN.</TT>
<TT>39:     CORBA::Short myPIN;</TT>
<TT>40: </TT>
<TT>41:     // A list of Accounts on which this ATM is authorized.</TT>
<TT>42:     std::vector&lt;Account_ptr&gt; myAccounts;</TT>
<TT>43: };</TT>
<TT>44: 
45: #endif</TT></FONT></PRE>
<H4><FONT COLOR="#000077">Listing 8.11. ATMCardImpl.cpp.</FONT></H4>
<PRE><FONT COLOR="#0066FF"><TT>  1: // ATMCardImpl.cpp</TT>
<TT>  2: </TT>
<TT>  3: #include &quot;ATMCardImpl.h&quot;</TT>
<TT>  4: </TT>
<TT>  5: #include &lt;iostream.h&gt;</TT>
<TT>  6: #include &lt;algorithm&gt;</TT>
<TT>  7: #include &lt;functional&gt;</TT>
<TT>  8: </TT>
<TT>  9: // STL-derived unary function which returns TRUE if Accounts are</TT>
<TT> 10: // equal.</TT>
<TT> 11: class IsAccountEqual : public std::unary_function&lt;Account_ptr,</TT>
<TT> 12:         bool&gt; {</TT>
<TT> 13: public:</TT>
<TT> 14:     IsAccountEqual(argument_type account) { myAccount = account; }</TT>
<TT> 15:     result_type operator()(argument_type account) { return account-&gt;</TT>
<TT> 16:             _is_equivalent(myAccount) != 0; }</TT>
<TT> 17: private:</TT>
<TT> 18:     argument_type myAccount;</TT>
<TT> 19: };</TT>
<TT> 20: </TT>
<TT> 21: // Constuctor.</TT>
<TT> 22: //</TT>
<TT> 23: // pin - the initial PIN to use for this ATMCard.</TT>
<TT> 24: // initialAccount - the Account for which this ATMCard is</TT>
<TT> 25: // initially authorized.</TT>
<TT> 26: ATMCardImpl::ATMCardImpl(CORBA::Short pin, Account_ptr</TT>
<TT> 27:         initialAccount) : myPIN(pin), myAccounts() {</TT>
<TT> 28: </TT>
<TT> 29:     // Add the Account to the authorized Account list.</TT>
<TT> 30:     myAccounts.push_back(Account::_duplicate(initialAccount));</TT>
<TT> 31: }</TT>
<TT> 32: </TT>
<TT> 33: // Default constructor.</TT>
<TT> 34: ATMCardImpl::ATMCardImpl() : myPIN(0), myAccounts() {</TT>
<TT> 35: </TT>
<TT> 36: }</TT>