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https://github.com/clausklein/callback_quoter

taox11 CORBA example
https://github.com/clausklein/callback_quoter

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taox11 CORBA example

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******************************************************************************

CALLBACK QUOTER TEST EXAMPLE                           -- Kirthika Parameswaran

                                                          

******************************************************************************



This is an distributed application which highlights the importance

of the callback feature in helping meet the demands of various clients

without them having to poll continuously for input from the server.



There are three parts to the Callback Quoter Example.



1) Supplier

2) Notifier

3) Consumer



In detail:

_________



1) Supplier

--is the market feed daemon who keeps feeding the current stock

information to the Notifier periodically.

The timer handler has been used in the implementation of the daemon

process. It reads the current stock value from a file and sends it to

the Notifier.



2) Notifier

-- On getting information form the supplier, it checks whether there are

any consumers interested in the information and accordingly sends it to

them. The consumer object is registered with the notifier and the data

is pushed to the consumer using this reference.



3) Consumer

-- He is the stock broker interested in the stock values in the market.

He will make decisions of selling only if the stock he is interested in

has a price greater than the threshold value he has set for that stock.

He just registers himself with the Notifier. This saves the time he wastes in

simply polling for information from the Notifier.

This is the callback feature in this example.



Running the application:

________________________



CASE I: USing the Naming Service

================================



a) Non-interactive



  SImply execute the ./run_test.pl, ofcourse after you start off the Naming Service.



b) Interactive



There are 3  parts to it:



1) shell 1: type at the command prompt:



./notifier



2) shell 2: type at the command prompt:



./consumer



register yourself with 'r'

Enter the stockname and value.

Now wait for information to arrive.



You can  unregister by typing 'u' and quit by typing 'q'.



3) shell 3: type at the command prompt:



./supplier -ifilename



The -i option simply tells the daemon where to pick information from.

TIP:: the contents of the input file per line should be: stockname and its price.

      Sample: ./example.stocks



The other option includes setting the period for the stock feed.



----------------------------------------------------------------------------



CASE II: Without using the Naming Service.

=========================================



There are 3  parts to it:



1) shell 1: type at the command prompt:



./notifier -fior_file -s



2) shell 2: type at the command prompt:



./consumer -fior_file -s



register yourself with 'r'

Enter the stockname and value.

Now wait for information to arrive.



You can  unregister by typing 'u' and quit by typing 'q'.



3) shell 3: type at the command prompt:



./supplier -ifilename -fior_file -s



The -i option simply tells the daemon where to pick information from.

TIP:: the contents of the input file per line should be: stockname and its price.

      Sample: ./example.stocks



The other option includes setting the period for the stock feed.



-----------------------------------------------------------------------------



Happy troubleshooting!!!