Package jline.api.mam

Class Map_sample.BmapSampler

java.lang.Object

jline.api.mam.Map_sample.BmapSampler

Enclosing class:

Map_sample

public static final class Map_sample.BmapSampler
extends Object

Stateful sampler for a BMAP (Batch Markovian Arrival Process) that retains the modulating phase between draws.

Successive calls to next(Random) continue the BMAP's underlying CTMC from the phase reached at the previous batch arrival, reproducing both the inter-arrival and batch-size autocorrelation. This differs from repeatedly invoking Map_sample.bmap_sample(MatrixCell, long, Random) with n=1, which re-initialises the phase from the stationary vector map_pie on every call and therefore yields an i.i.d. (renewal) batch-arrival sequence with the correct marginals but zero autocorrelation. Use this sampler when a BMAP is an arrival process whose burstiness must be preserved across events.

The phase persists across idle periods (it is only advanced when next(Random) is called), matching the MAP/MAP/1 convention in which the arrival process is not frozen while downstream stations are busy.

Constructor Summary

Constructors

Constructor	Description
BmapSampler(MatrixCell bmap)

Method Summary

Modifier and Type	Method	Description
int	getPhase()	Current modulating phase (0-based), or -1 before the first draw; 0 when exponential.
BmapSample	next(Random random)	Draws one BMAP event (inter-arrival time and batch size), advancing (and retaining) the modulating phase.
BmapSample	next(Random random, PhaseTrace trace)	As next(Random), additionally recording the sojourns of the walk into trace (cleared first).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BmapSampler

public BmapSampler(MatrixCell bmap)

Method Details

next

public BmapSample next(Random random)

Draws one BMAP event (inter-arrival time and batch size), advancing (and retaining) the modulating phase.

getPhase

public int getPhase()

Current modulating phase (0-based), or -1 before the first draw; 0 when exponential.

next

public BmapSample next(Random random,
 PhaseTrace trace)

As next(Random), additionally recording the sojourns of the walk into trace (cleared first). Same draws, same result.

Parameters:

trace - sojourn recorder, or null to record nothing