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HlcGenerator

Struct HlcGenerator 

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pub struct HlcGenerator { /* private fields */ }
Expand description

Monotonic HLC generator for a single replica.

Thread-safe via an internal Mutex. Lock contention at HLC-generation rates (typically hundreds per second per replica) is negligible.

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impl HlcGenerator

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pub fn new(replica_id: ReplicaId) -> Self

Create a new generator for the given replica.

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pub fn next(&self) -> ArrayResult<Hlc>

Generate the next Hlc, guaranteeing strict monotonicity.

Implements the standard HLC advancement algorithm:

  • new_physical = max(now_ms, last_physical)
  • if new_physical == last_physical: new_logical = last_logical + 1
  • else: new_logical = 0
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pub fn observe(&self, remote: Hlc) -> ArrayResult<()>

Advance local state after observing a remote Hlc.

Implements the standard HLC merge rule so that subsequent calls to next return timestamps strictly greater than any observed remote timestamp.

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