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22 balance = balance withdrawalAmount; 23 return balance; 24 } 25 26 public float deposit (float depositAmount ) { 27 balance = balance + depositAmount; 28 return balance; 29 } 30 31 public static void main ( String args [] ) { 32 33 try { 34 // Initialize the ORB 35 ORB orb = ORB.init (args, null ); 36 37 // instantiate an AccountServerImpl object and register it with the ORB 38 AccountServerImpl accountServer = new AccountServerImpl (); 39 orb.connect ( accountServer); 40 41 //Obtain the root naming context 42 org.omg.OCORBA.Object obj = orb. 43 resolve_initial_references ("NameService"); 44 NamingContext namingContext = NamingContextHelper. narrow (obj); 45 46 // Bind the accountServer object reference in the naming context 47 NameComponent nameComponent = new NameComponent ( 48 "AccountServer", ""); 49 NameComponent path [] = { nameComponent }; 50 namingContext.rebind (path, accountServer); 51 52 //wait for method invocation requests from the clients. 53 java.lang.Object waitObject = new java.lang.Object (); 54 synchronized (waitObject) { waitObject.wait (); } 55 } 56 catch ( Exception ex ) { 57 System.out.println ( "Could not bind accountServer: " + ex.getMessage()); 58 } 59 } 60 }
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Because the AccountServer interface is the part of the SavingAccount module, the IDL compiler places the Java class and interface definition into the SavingAccount package (see line 1). For convenience, we place the AccountServerImpl also in the same package. Lines 2 5 contain the commonly imported files in a CORBA application. The first file provides the functionality to
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communicate through the ORB. The other three files are related to the CORBA naming service. The naming service enables CORBA objects to register and be located by name. This service uses the notion of a naming context, which contains a set of unique names. The naming service may be considered the first step toward the development of a service registry, which is required in SOA.
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Extending the Base Class In lines 8 and 9, the base implementation class, AccountServerImplBase, and the interface, AccountServer, are generated by the IDL compiler. Our server implementation class extends the base implementation class and implements the generated interface. The base implementation class contains all the functionality the server needs to communicate with its ORB. Server Class Member In the example we are considering, we need to
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track only one quantity, namely the account balance. Therefore, we have defined exactly one class member, named balance, which is of Java type float (see line 11).
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Methods Implementation Lines 13 29 contain the implementation code for the three methods declared in the AccountServer interface. The first method, getBalance(), returns the current balance amount as a Java float type. The second method, withdraw(), takes the withdrawal amount and subtracts it from the balance. The new balance is the return value. Similarly, the third method, deposit(), takes the deposit amount and adds it to the balance. This method also returns the new balance. Main Method In the main method, shown in lines 31 60, we create an
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instance of the AccountServerImpl class, bind the instance to a naming context, and then wait for the clients to make method invocation requests. Some of this code is explained in more detail in the upcoming subsections.
ORB Initialization, Object Instantiation, and Registration In lines
35 39, we first initialize the ORB and then create an instance of the AccountServerImpl class. The newly created object is then registered with the ORB. In order for clients to connect to AccountServerImpl, they must have some way of locating the service on the network. One way to do this is through the CORBA naming service. In lines 42 44, a NamingContext object is located by resolving a reference to an object named NameService.
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