[GitHub] [pulsar] sijie opened a new pull request #4562: [client] Provide a clock for generating publish timestamp for producers

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sijie opened a new pull request #4562: [client] Provide a clock for generating publish timestamp for producers
URL: https://github.com/apache/pulsar/pull/4562
 
 
   *Motivation*
   
   Currently producers uses `System.currentTimeMillis()` as publish timestamp by default.
   However at some use cases, producers would like to a different way for generating publish timestamp.
   E.g. in a database use case, a producer might be use HLC (Hybrid Logic Clock) as publish timestamp;
   in integration tests, it might require the producer to use a deterministic way to generate publish timestamp.
   
   *Changes*
   
   This PR introduces a `clock` in building the client. This allows applications to override the system clock
   with its own implementation.
   
   *Verify the change*
   
   Add unit test to test customized clock in both batch and non-batch cases.
   
   

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