Listing

// All required imports

public class DisplayServices extends HttpServlet {

// variable declarations

public void init() {
// all inits required
}

public void doPost(HttpServletRequest request, HttpServletResponse
response)
throws IOException, ServletException {

// other processing, if any

InitialContext ctxt = new InitialContext();
Object obj = ctxt.lookup("java:comp/env/ejb/Catalog/Services");
CatalogHome catHome = (CatalogHome)
PortableRemoteObject.narrow(obj, CatalogHome.class);
Catalog catList = catHome.create();
Collection list = catList.getServiceNames();
while(int i=0; i < list.size(); i++) {

// get the service name

// display the service name received

}
// do other processing required
}
// other methods definitions
}

// The following is the sample code of the CatalogEJB
// For simplicity sake, the definitions of the home and remote
// interfaces are not shown

// All required imports

public class CatalogEJB implements EntityBean {

// Methods like ejbCreate etc go here

// Business methods start herepublic Collection getServiceNames() {
// Access the database and get the list of service names
// Form a collection of the service names
// Return this collection
}

public int updateServices(arg1, arg2) {
// this method will allow the CatalogEJB to update the list ofServices;
// for example, this method might build the SQL query for updatingthe
// list services in the catalog and use JDBC to execute the query
}

public int addServices(arg1, arg2) {
// this method will allow the CatalogEJB to add to the list ofServices
}

// Other business methods
} 

// all required imports

public class CatalogDataAccessObject {

private Connection dbConnection;
private DataSource datasource;

public CatalogDataAccessObject() {

// appropriate exceptions to be caught
InitialContext ic = new InitialContext();
datasource = (DataSource)
ic.lookup("java:comp/env/jdbc/CatalogDataSource");
dbConnection = datasource.getConnection();
}

public int updateServices(arg1, arg2) {
// this method will allow the CatalogEJB to update the list ofServices;
// for example, this method might build the SQL query for updatingthe
// list services in the catalog and use JDBC to execute the query
}

public int addServices(arg1, arg2) {
// this method will allow the CatalogEJB to add to the list ofServices
}

public Collection getServiceNames() {
// this method will allow the catalogEJB or any clientusing Fast Lane
// Reader pattern to get the list of services
}

// other method definitions as required
} 

// All required imports

public class DisplayServices extends HttpServlet {

private CatalogDataAccessObject dao;
// other declarations

public void init() {
CatalogDataAccessObject dao = new
CatalogDataAccessObject();

// all other inits required
}

public void doPost(HttpServletRequest reqest,
HttpServletResponse response)
throws IOException, ServletException {

// other processing, if any

Collection list = dao.getServiceNames();
for(int i=0; i

// all required imports

public class PageByPageIteratorImpl {

/*
"start" represents the starting index of the first element of this
sublist.
*/
private int start;

/*
"size" represents the number of elements that are in this sublist.
*/
private int size;

/*
"totalCount" represents the total number of objects that would
have beenreturned in the absence of the Page-By-Page Iterator; very useful
informationfor the clients in deciding to iterate more or not
*/
private int totalCount;

/*
"objs" has the actual collection of objects
*/
private Collection objs;

public PageByPageIteratorImpl(int start, int size, int total,
Collection
coll) {
this.start = start;
this.size = size;
this.totalCount = total;
this.objs = coll;
}

public int getStartIndex() {
return start;
}

// Other similar accessor methods for size, totalCount, objs
} 

public PageByPageIteratorImpl getServiceNames(int startIndex,
int size) {
// get the total count of the number of service into
variable "total";
// access the database and get the collection of service
names in
// "retObjs";
// the collection obtained will be of requested size only
starting from
// the index specified;
// return the collection of service names as part of the
Page-by-Page Iterator
return(new PageByPageInteratorImpl(startIndex, size,
total, retObjs));
}
// other method definitions as required
}

// All required imports

public class DisplayServices extends HttpServlet {

private CatalogDataAccessObject dao;
// other declarations

public void init() {
CatalogDataAccessObject dao = new
CatalogDataAccessObject();
// all other inits required
}

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
// other processing, if any
Integer startIndex = new
Integer(request.getParameter("StartIndex"));
Integer listSize = new
Integer(request.getParameter("ListSize"));
PageByPageIteratorImpl list =
dao.getServiceNames(startIndex.intValue(),
listSize.
intValue());
Collection objs = list.getCollection();
// Now the list received is of requested size only
// iterate thro the list and display the service namesreceived
// do other processing as required
}
// other method definitions
} 

// all imports required

public class ServiceInformation implements java.io.Serializable {

private String serviceName;
private double serviceCost;
private String[] serviceTerms;
// other attributes of a service

public ServiceInformation(String name, double cost, String[]
terms) {
serviceName = name;
serviceCost = cost;
serviceTerms = terms;
}

public String getName() {
return(serviceName);
}

public double getCost() {
return(serviceCost);
}

public String[] getTerms() {
return(serviceTerms);
}
// similar accessor methods for other attributes
} 

// All required imports

public class DisplayServices extends HttpServlet {

private CatalogDataAccessObject dao;
// other declarations

public void init() {
CatalogDataAccessObject dao = new
CatalogDataAccessObject();
// all other inits required
}

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
// other processing, if any
Integer startIndex = new
Integer(request.getParameter("StartIndex"));
Integer listSize = new
Integer(request.getParameter("ListSize"));
PageByPageIteratorImpl list =
dao.getServiceNames(startIndex.intValue(),
listSize.intValue());
Collection objs = list.getCollection();
// The collection is a collection of the value objects
// Now the list received is of requested size only
// extract the service names and the attributes from the
value objects
// display everything and do other processing as required
}
// other method definitions
}