Question about page 488 of Head First Java
Jose Campana
Ranch Hand
Posts: 339
posted 9 years ago
Hiya! buddies. How's everything in the Ranch?
Have a nice happy and safe Halloween!
Leaving the ghostly matters aside I have a question concerning sockets and threads.
There's an exercise in the Head First book, it's about making a chat application, but in page 488 I don't understand the explanation given for not using Option number 2. It says:
--The book states that this option shouldn't be considered because it's an arbitrary time to check for messages.
Could someone explain me Why is it arbitrary? --because I would have done exactly as suggested in option 2.
And more Importantly,
I don't understand
How exactly is option 3 different from Option 2?
I don't quite get it. *Help Me
I anticipate my most sincere gratitude for all you time.
Sincerely,
Jose
Have a nice happy and safe Halloween!
Leaving the ghostly matters aside I have a question concerning sockets and threads.
There's an exercise in the Head First book, it's about making a chat application, but in page 488 I don't understand the explanation given for not using Option number 2. It says:
Option Two: Read something in from the server each time the user sends a message.
--The book states that this option shouldn't be considered because it's an arbitrary time to check for messages.
Could someone explain me Why is it arbitrary? --because I would have done exactly as suggested in option 2.
And more Importantly,
I don't understand
Option 3: Read messages as soon as they're sent from the server
How exactly is option 3 different from Option 2?
I don't quite get it. *Help Me
I anticipate my most sincere gratitude for all you time.
Sincerely,
Jose
Chris Corbyn
Ranch Hand
Posts: 114
posted 9 years ago
I think the wording is perhaps a bit misleading. "User" refers to the local client I assume, and in which case if you only read from the server when the local client sends a message then you would only ever know if the remote client in the chat has said anything once you say something.
Jose Campana
Ranch Hand
Posts: 339
Adam Schaible
Ranch Hand
Posts: 101
posted 9 years ago
So option two says that I will retrieve everyone elses messages when I MYSELF send a message.
Option three says that I will retrieve everyone elses messages when THEY send a message.
Imagine if your IM client of choice didn't tell you what the person you're talking to said, until you sent them a message. It would be very difficult to have a conversation, and the reason it's arbitrary is because you may type a message every second, or every century.
Option three says that I will retrieve everyone elses messages when THEY send a message.
Imagine if your IM client of choice didn't tell you what the person you're talking to said, until you sent them a message. It would be very difficult to have a conversation, and the reason it's arbitrary is because you may type a message every second, or every century.
Jose Campana
Ranch Hand
Posts: 339
posted 9 years ago
Hey Adam.!
Thank you very much... I've got it.
That's the clarification I just needed..
Keep on your excellent work ! You don't know how much I appreciate it ! But it's really a lot.
Thank you fellow java programmer.
Sincerely,
Jose
Thank you very much... I've got it.
That's the clarification I just needed..
Keep on your excellent work ! You don't know how much I appreciate it ! But it's really a lot.
Thank you fellow java programmer.
Sincerely,
Jose
