[infinispan-dev] [Discussion] TimeService implementation

[Pedro Ruivo]

Hi,

The TimeService interface is going to replace all the System.nanoTime() 
and System.currentTimeMillis() in the code and it will allow to replace 
in the test suite in order to provide a better control over the time 
dependent code (if needed).

The objective of this email is to discuss possible implementation and 
interface that will cover the needs of everybody (or at least try it). 
Later I'll create a JIRA and start the implementation (except if someone 
really wants to implement it :P)

* Interface:

//return the current time in nanoseconds and milliseconds respectively
long nowNanos()
long nowMillis()

//return the duration between now() and the startNanos/Millis
long durationNanos(long startNanos)
long durationMillis(long startMillis)

//return the duration between start+ and end+
long durationNanos(long startNanos, long endNanos)
long durationMillis(long startMillis, long endMillis)

Any other method? Maybe adding a TimeUnit parameter instead of duplicate 
methods (e.g. now(TimeUnit))? Maybe some convert() with double 
precision, since the TimeUnit.convert(...) usually loses precision?

(I need double precision for the Extended Statistics, but I can put this 
converters in my classes)

* Scope:

Should the TimeService be in a cache or global scope? My vote is per 
cache...

* Configuration

Should we provide a configuration to pass an implementation of the 
TimeService interface? if yes, we may need to change the methods above 
to return some interface (e.g. TimeStamp) in order to support almost 
anything.

Any other subject? Thoughts?

If I was not clear let me know...

Cheers,
Pedro Ruivo