How to realize "Redundant & backup" with EMA(C++)

luxiangyuan

hello:

there are two machine "A"&"B" to trans data from THOMSON REUTERS;

I develop the consumer APP with EMA(c++);

now I connect to A with codes as follows:

"OmmConsumer consumer( OmmConsumerConfig().host( "140.143.1.214:14002" ).username( "user1" ) );"

so my question is how can I connect to another machine B at the same time.

umer.nalla

Hi @luxiangyuan

Please refer to the Channels and ChannelSets section of this EMA Config Overview article.

Using a ChannelSet will allow you to specify two or more servers to which the API can automatically attempt connection in the event of a server being unavailable at connection time or some later point in time.

It will not create two connections 'at the same time'. For this you would need to use two OmmConsumer instances - each with its own connection to the same or different server. Two OmmConsumer is typically used when you want to 'horizontally scale' i.e. split your subscriptions between two different servers (in order to spread load etc).