Figure 10. VChemLab Distributed Object Computing Environment

Other distributed computing architectures are possible, for example using the Common Gateway Interface (CGI) or CORBA technology. CGI has an advantage in not requiring Java capability in the client. However, it is a stateless client-server model and there is no persistent connection to a database, so the run-time processes must be re-established with each connection, leading to significant processing overheads on the server. CORBA allows the use of a persistent heterogeneous programming environment, although any performance loss with the RMI will hopefully disappear with the development of more efficient Java compilers. Furthermore, with the availability of object databases, as distinct from the more commonly-found relational or heirarchical databases, it is now possible to store and retrieve these objects within a database in the same form as the object-oriented programming environment

import java.io.*;
public class molData implements Serializable {

String molName; String filName; String Project;
double mp; double bp; double ri; double alpha_d;
public int molArray = 4; String safe[] = new String[molArray];

//

Create constructor method for class molData

public molData (String molName2, String filName2, String Project2,
double mp2, double bp2, double ri2, double alpha_d2,
String safe0, String safe1, String safe2, String safe3) { //
//Associate the object variables with
//arguments passed to the constructor
//
this.molNam= molName2;this.filName= filName2;
this.mp= mp2;this.bp= bp2;
this.ri= ri2;this.alpha_d= alpha_d2;
this.safe[0]= safe0;this.safe[1]= safe1;
this.safe[2]= safe2;this.safe[3]= safe3;
}
public String getMolName() {return molName;}
public double getMP() {return mp;}
public double getBP() {return bp;}
public String getSafety(int ii) {return safe[ii];}
}

Figure 11. Representative Java Class Definition for the Molecular Data Object