IObserver adding new object to IObservable

Question

0.00/5 (No votes)

See more:

Is it by any means possible to:

I have an object that is IObservable and it has several IObserver object.
Can one (or more) of these IObserver objects create a new object (from an other class then itself) but make this new object also observer of the IObservable i have?
I wouldnt know how to write the code and get the new object subscribed to the original IObservable.

:~

Posted 19-Feb-11 2:04am

Vincent Beek

Add a Solution

2 solutions

Solution 1

Hi
IObservable usually has a list/array to store the observers which should be an observer type. IObserver type has a function which will be called by the Observable. So Observers implemented it. So when you create new object if it is a IObserver type then you can add it to observable and the new Observer get notified.

It depends how you use the data in the new objects when notified.

Try and if got doubts you can post comments here

Posted 19-Feb-11 2:58am

Albin Abel

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Nish Nishant · Accepted Answer · 2011-02-19T03:10:00

Solution 2

To do that, the IObserver object creating the new IObserver object will need to have access to the instance of the IObservable object it's subscribed to. Whether that's so is an implementation detail.

I don't think there's anything wrong in doing that, although it does seem a little odd.

Posted 19-Feb-11 3:10am

Nish Nishant

Updated 19-Feb-11 3:11am

v2

Comments

Vincent Beek 19-Feb-11 9:32am

Exactly, but how to get this access?

Nish Nishant 19-Feb-11 9:42am

While it's probably not the best design, the IObserver implementation can store the IObservable in a member field.

Espen Harlinn 19-Feb-11 10:12am

Good answer :)

Nish Nishant 19-Feb-11 10:13am

Thanks Espen.