Nikolaos Giannopoulos <nikol...@...> writes:
>
> Milan,
>
> In that case why bother with a DAO at all? i.e. although it would be
> nice to plug in a DB later the problem you are going to have is where to
> store the information for the life of a user session and that is
> typically going to be on the session itself... however until you pass
> the http request to the DAO you won't have access to that.
>
> Personally... I see 2 obvious choices:
>
> #1 Use DAO's and add arguments to pass in the http request / session.
>
> #2 Use a custom action bean context as I showed you in the previous
> reply and put access methods on the context itself.
>
> I would go with #2 regardless so that it encapsulates the data you are
> retaining.
>
> And if you need to create the additional abstraction or will want to
> eventually go to a DB then wrap #1 around it but in that case you will
> want to eventually change both the DAO interfaces (as the http request /
> session will no longer be required) and the DAO implementation; doesn't
> totally defeat the purpose of a DAO abstraction but isn't the right thing.
>
> In fact, the more I think about it I would look at a different design
> pattern altogether that focuses on maintaining state or simply do #2.
>
> --Nikolaos
>
> Milan Halenar wrote:
> > Milan Halenar <mhale...@...> writes:
> >
> >
> >
> > Ad: im not using any DB, im just storing the content of file in memory in
the
> > FileParser class in an ArrayList. And i need for every session to have its
own
> > instance of that class. I hope i cleared it a bit.
> >
> >
> >
> >
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When i was writing the DAO, i was inspired by the book "Stripes and Java, web
developement is fun again", so i made my class look like this:
---
public class FileParser {
private List<NetflowRecord> records = new ArrayList<NetflowRecord>();
private static FileParser fp = new FileParser();
private long TIMECONST = 30L;
private boolean isColored= false;
private FileParser() {
}
public static FileParser getInstance() {
return fp;
}
//getters and setters
public void parseFile(File file) {
//get contents from file to the Arraylist
}
---
In my ActionBean it looks:
public class TableActionBean implements ActionBean {
private FileBean newAttachment;
private FileParser fp = FileParser.getInstance();
public Resolution upload() throws IOException {
File tmpFile = File.createTempFile("temp", "txt");
fp.parseFile(tmpFile);
context.getRequest().setAttribute("loaded", true);
return new RedirectResolution("/index.jsp");
}
---
Now the situation: when I upload the file, i can see its contents from other
sessions(browsers) as well, and i wanted to have new instance with another data
for every session. So your suggestion #2 setting the FileParser up in the
ActionBeanContext will do the trick? Sorry for being a bit confusing.
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