How much coding effort needed if migrating from RFA7.7 to RTT EMA

Hi @aftab

I noticed you asked a similar question for migrating from RFA 7.7 to RFA 8.x

Assuming you are using the legacy MarketData/SSLED interface with RFA 7.7, as explained in my other post, moving from RFA 7.7 to EMA will be considerably less effort than moving to the RFA 8.x OMM interface.

If you compare the legacy RFA 7.7 consumer example RFASTTicker (C++) or the most basic MDSubDemo (Java) with a similar EMA consumer example such as 200_MP_Streaming - you will note that the EMA examples use a fraction of the code to achieve the same functionality compared their RFA equivalents.

This is because EMA is a high-level ease of use layer API which defaults much of the most commonly performed operations e.g.

// C++
OmmConsumer consumer( OmmConsumerConfig().host( "ads1:14002" ).username( "user" ) );

OR

// Java
OmmConsumerConfig config = EmaFactory.createOmmConsumerConfig();
consumer  = EmaFactory.createOmmConsumer(config.host("ads1:14002").username("lpcuser2"));

Executing the above lines of code performs the following (behind the scenes)

• Establish a session (connect to a server)
• login to the server with user name,
• download the data dictionary
• download the source directory

Achieving the above with the RFA OMM interface would require 100+ lines of code.