Register multiple batch request

gang.chen1

Hi Team,

There is a 65535 byte limit on the size of the ElementList entry that is used when making the Batch request for EMA API. Could you pls give us a demo how to send another Batch request if the RIC list exceed 65535 byte ?

BTW, what is the meaning of consumer.unregister(arg0);

thanks

Gang

wasin.w

Hello @gang.chen1

According to the EMA Java API Reference document, the OmmConsumer's unregister function accepts the handle value as an input parameter to specify which stream the application wants to close.

The EMA API assigns all opened items or instruments a unique numeric identifier (e.g. long), called a handle, which is returned by the OmmConsumer.registerClient() call. A handle is valid as long as its associated item stays open.

Note: The EMA Java API Reference document at the <RTSDK package>\Java\Ema\Docs\refman\emajava folder.

However, for the batch subscription, the API automatics unsubscribe the batch stream for the application (this is why the application receives the "Stream closed for batch" message), so the application does not need to call OmmConsumer.unregister(batch_handle) manually.

raksina.samasiri

hi @gang.chen1 ,

For sending multiple batch requests, could you please check the answer provided in this thread

gang.chen1

https://community.developers.refinitiv.com/discussion/comment/93434#Comment_93434

Hi samasiri,

Thanks and I saw that before. Double confirm we can just send consumer.registerClient again and again ? and no need to call consumer.unregister(arg0) in the middle ?

finally, what is the usage of consumer.unregister(arg0);

thx

raksina.samasiri

https://community.developers.refinitiv.com/discussion/comment/93434#Comment_93434

hi @gang.chen1 ,

regarding the meaning of consumer.unregister(arg0);

you may check the documentation provided in Message API - Java: Development and Configuration Guides with Examples > EMA J RDM Usage Guide

page 7. mentioned that OmmConsumer.unregister() is the Close Message (Request)

Page 9. for the general domain use,

When the consumer is no longer interested, it sends an CloseMsg to close the stream

gang.chen1

https://community.developers.refinitiv.com/discussion/comment/93439#Comment_93439

Hi Samasiri,

Thanks and what is the arg0 parameter should be? seems no explanation for it , or just call consumer.unregister();

thx