Am trying to upgrade my fabric sdk java from 1.4 to 2.2 version Is see eventhub being removed from 2.x version Now how should I register my events and how should I wait for chain code events in 2.2 version Am new to hyperledger, can someone help me on this please.Is there any samples for this
Fabric sdk java upgrade 1.4 to 2.2 version
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Just by way of background, the event hub service was superseded by the peer channel-based event service in Fabric v1.1. If you're set on using the fabric-sdk-java API then you have
registerChaincodeEventListener()on theChannelobject. Be aware that you might receive duplicate or out-of-order events.I would strongly recommend that you use the fabric-gateway-java API, which allows you to listen to chaincode events using
addContractListener()on theContractobject:https://hyperledger.github.io/fabric-gateway-java/release-2.2/org/hyperledger/fabric/gateway/Contract.html
This will give you events in order and without duplication, replay of events, and checkpointing to allow you to resume listening from your last received event after a client application restart. As well as a generally much more friendly API to work with.