Java开发网 - Applying Visitor Pattern in Struts

Topic: Applying Visitor Pattern in Struts

1.Applying Visitor Pattern in Struts

Posted by: arjooe
Posted on: 2003-03-21 16:23

In my BSS project, a web service application developed for IT business support,
We write many beans implement this interface:

public interface Visitable{
  public void acceptUpdate(DbVisitor action);
  public void acceptInsert(DbVisitor action);
  public void acceptDelete(DbVisitor action);
}

implemented method like this:
public void acceptXxxxx(dbvisitor){
  dbvisitor.visit(this);
}

We write a singltone class Object BbVisitor implement this interface:

public interface Visitor throws SQLException {
  public void visit(Object);
}
put all database operation in this class centerally and retrieve SQL string from properties resource file,
and save this object in servletContext. So we can get database vendor information and write code
of getting database connection once, select proper manipulate sql statment according to concrete
database server all in this class.