pdf417 java library Discussion in Java

Generator PDF 417 in Java Discussion

Discussion
PDF 417 Maker In Java
Using Barcode generator for Java Control to generate, create PDF 417 image in Java applications.
www.OnBarcode.com
PDF-417 2d Barcode Decoder In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
EJB clients can choose to log the returned bean description, or even parse it. When developers are using a debugger to examine EJB data, they can use the ejbToString() method to quickly ascertain the state of the bean s attributes. For instance, the ejbToString() method in the recipe example describes an instance of the EquityBean entity bean by returning the value of all its attributes.
Create PDF-417 2d Barcode In Java
Using Barcode encoder for Java Control to generate, create PDF 417 image in Java applications.
www.OnBarcode.com
Barcode Drawer In Java
Using Barcode printer for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
4.3 Providing common methods for all your EJBs
EAN13 Drawer In Java
Using Barcode generator for Java Control to generate, create EAN 13 image in Java applications.
www.OnBarcode.com
Matrix Generator In Java
Using Barcode creation for Java Control to generate, create Matrix Barcode image in Java applications.
www.OnBarcode.com
Problem
Create Code 3/9 In Java
Using Barcode generation for Java Control to generate, create Code-39 image in Java applications.
www.OnBarcode.com
Drawing USD-3 In Java
Using Barcode generator for Java Control to generate, create USD-3 image in Java applications.
www.OnBarcode.com
You want your remote and/or local interface for all your EJBs to have common methods.
Paint PDF-417 2d Barcode In None
Using Barcode creator for Font Control to generate, create PDF 417 image in Font applications.
www.OnBarcode.com
PDF-417 2d Barcode Drawer In Java
Using Barcode creation for BIRT Control to generate, create PDF417 image in Eclipse BIRT applications.
www.OnBarcode.com
Background
Encoding EAN13 In Objective-C
Using Barcode drawer for iPhone Control to generate, create EAN13 image in iPhone applications.
www.OnBarcode.com
Decode Barcode In VB.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
When developing complex enterprise applications, you should use good objectoriented practices to increase the maintainability and ease of understanding of your code. One way to do this is to use super classes and super interfaces to encapsulate common functionality or methods in a single location that can be inherited by other classes or interfaces. In the Enterprise JavaBean world, you can use a super interface to provide common methods across all business interfaces of your EJBs. By including a super interface, your EJB clients can always expect certain methods to be present in the EJB interfaces.
Code 128 Code Set B Decoder In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Encode Barcode In Objective-C
Using Barcode creator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
EJB activities
Barcode Generation In Java
Using Barcode printer for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Creating Data Matrix In Java
Using Barcode generator for Android Control to generate, create DataMatrix image in Android applications.
www.OnBarcode.com
Recipe
Paint PDF 417 In Java
Using Barcode creator for Android Control to generate, create PDF 417 image in Android applications.
www.OnBarcode.com
Painting EAN-13 In C#
Using Barcode creation for VS .NET Control to generate, create European Article Number 13 image in Visual Studio .NET applications.
www.OnBarcode.com
In order to provide common methods for all your EJB s, you need to create a base interface. For this example, we want all of our EJB s to implement the method we describe in recipe 4.2, ejbToString(). First, create a base interface like the following:
Generate EAN-13 Supplement 5 In None
Using Barcode drawer for Font Control to generate, create EAN / UCC - 13 image in Font applications.
www.OnBarcode.com
Barcode Drawer In None
Using Barcode printer for Office Excel Control to generate, create Barcode image in Office Excel applications.
www.OnBarcode.com
public interface UtilInterface extends EJBObject{ public String ejbToString() throws RemoteException; }
With the base interface completed, all of the EJB remote (or local) interfaces just need to extend it instead of the EJBObject interface (or the EJBLocalObject interface if you use that instead):
public interface Equity extends UtilInterface{ public void setEquity(EquityVO equity)throws RemoteException; public EquityVO getEquity()throws RemoteException; }
The actual EJB class (listing 4.2) does not implement the base interface, but still must implement its methods since they are inherited into the remote (or local) interface of the EJB.
Listing 4.2 EquityBean.java
abstract public class EquityBean implements EntityBean { public String ejbToString(){ StringBuffer buffer = new StringBuffer(); EquityVO equity = new EquityVO(); equity.symbol=getSymbol(); equity.description=getDescription(); equity.lastTrade=getLastTrade(); equity.change=getChange(); equity.volume=getVolume(); equity.marketCap=getMarketCap(); equity.PE=getPe(); equity.avgVolume=getAvgVolume(); buffer.append("-------------[ Equity Entity Bean ]------------\n"); buffer.append("Entity ID:"+id()+"\n\n"); buffer.append(equity.toString()+"\n"); buffer.append("-------------[ Equity Entity Bean ]------------"); return buffer.toString(); } //other bean methods not shown }
Reducing the clutter of unimplemented bean methods
Discussion
Using super interfaces is an excellent way to ensure that all your EJBs at least attempt to provide an implementation for a common method. By supplying the base interface, implementing EJBs are required to provide at least a trivial implementation of the methods (of the base interface) in order to compile. With each EJB interface inheriting a common super interface, EJB clients assume that EJBs will contain the common methods. In fact, with the super interface in place, your clients can make use of casting techniques to provide greater flexibility and perhaps create longer-lived code through more object-oriented coding practices.
See also
2.1 Generating home, remote, local, and local home interfaces 2.4 Creating value objects for your entity beans 3.17 Decreasing the number of calls to an entity bean 4.1 Retrieving an environment variable 4.4 Reducing the clutter of unimplemented bean methods
4.4 Reducing the clutter of unimplemented bean methods
Problem
In many cases, EJB methods such as ejbPassivate() and ejbActivate() are left with empty implementations. You would like to remove the clutter of unimplemented methods from your EJB classes.
Background
When you re developing EJBs, many times the numerous EJB lifecycle methods are left without meaningful implementation. This leaves beans with a more cluttered class file, with several empty methods. In addition, each time you develop a new bean, you could find yourself adding the empty methods via cut and paste. It would be nice to remove these methods from your bean class file and not have to add them for each new EJB.
Recipe
For each type of EJB, create an adapter super class that defines all of the standard methods required for that type. Your bean classes can subclass the correct adapter
Copyright © OnBarcode.com . All rights reserved.