tree 2d015b1329fccb1e2fead6feab87f01aa33bddce
parent c75aa626183fb4086a9438215e9c55fed16565d9
author dferstay <dferstay@users.noreply.github.com> 1595557049 -0700
committer GitHub <noreply@github.com> 1595557049 -0700
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Different MessageID implementations for message Production and Consumption (#324)

This change splits the `MessageID` implementation in two:
1. `messageID` - A 24 byte structure that contains message identification
                 information only; to be used during message production
2. `trackingMessageID` - A 72 byte structucture that shares the same
                         message identification information as `messageID`
                         and adds `ackTracker`, `acker`, and `receivedTime`
                         fields; to be used during message consumption

Micro benchmarks show that passing arguments by value that are less-than
four words of memory are optimized by the Go runtime.  Results from the
pulsar/impl_message_bench_test.go module are below.

```
name            time/op
ProducerCall    1.46ns ± 5%
ProducerCall-4  1.47ns ± 5%
ConsumerCall    7.62ns ± 1%
ConsumerCall-4  7.53ns ± 5%
```

Co-authored-by: Daniel Ferstay <dferstay@splunk.com>