[Transaction] Introduce Transaction Client API #4952
Merged
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Motivation
Introduce the transaction API to setup the skeleton on implementing
the transactional client.
Also add an example to show how to use the transaction API.
Modifications
newTransaction
to clientnewMessage(Transaction)
method to produceracknowledgeAsyc(MessageId, Transaction)
method to consumerNOTE: these methods are only exposed to the implementation classes (ProducerImpl, ProducerImpl, and ConsumerImpl).
Will only add them to the interfaces when the features are completed.