question

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pratik.p.mehta avatar image
11 ●1 ●1 ●4

Item Resubscription

So we open a session for subscription for an item say AAPL.OQ, get some refresh and updates, then close the subscription using CloseMsg with below params:

closeMsg.clear();
encodeIterator.clear();
closeMsg.msgClass(MsgClasses.CLOSE);
closeMsg.containerType(DataTypes.NO_DATA);
closeMsg.flags(CloseMsgFlags.ACK);
byteBuffer.clear();
encodeBuffer.clear();
encodeBuffer.data(byteBuffer);

encodeIterator.setBufferAndRWFVersion(encodeBuffer, Codec.majorVersion(), Codec.minorVersion());

Now within the same session, I want to resubscribe to AAPL.OQ, I see that though my request for subscription is sent to TREP, I don't get any responses (refresh messages) back.

How to resubscribe after unsubscription within the same session

elektronrefinitiv-realtimeelektron-sdktrep
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2 Answers

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Jirapongse avatar image
38.1k ●69 ●35 ●53

@pratik.p.mehta

To close a stream, you need to specify the streamID of the closed item.

closeMsg.clear();
closeMsg.msgClass(MsgClasses.CLOSE);
closeMsg.streamId(streamId());
closeMsg.domainType(domainType);
closeMsg.containerType(DataTypes.NO_DATA);

After that, you can send a new request message to subscribe to that item.

You can refer to the com.thomsonreuters.upa.examples.consumer example in the Elektron SDK package regarding closing and requesting items.

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umer.nalla avatar image
20.3k ●73 ●10 ●20

Hi @pratik.p.mehta

Depending on your use case / requirements - you may want to explore the Pause / Resume functionality available with the Elektron APIs.

As the name suggests, you can pause an event stream and resume it as required - for some scenarios this can be more efficient than close and resubscribe.

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