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Informations about the package nexus-metric-engine

Nexus MetricEngine

Deterministic Layer 1 metric calculation engine for Nexus packages.

Nexus\MetricEngine evaluates prepared scalar and time-series inputs against neutral formula definitions. It does not fetch data, persist state, render reports, or attach domain meaning to metrics.

Installation

Requirements

Basic Usage

Supported Calculations

Scalar primitives:

Time-series primitives:

Failure Semantics

MetricEngine fails loudly with package-specific exceptions for invalid formula structure, missing inputs, incompatible input types, invalid numeric values, divide-by-zero operations, invalid windows, and insufficient time-series data.

It does not return fallback values or synthetic zeros unless a caller-defined formula explicitly models that behavior.

Batch Evaluation

Use FormulaCatalog and BatchFormulaEvaluatorService when an application needs status-aware metric runs.

The batch evaluator also accepts a formula list directly:

Enable audit traces when callers need deterministic calculation evidence. Traces include original operands, resolved operands, used input values, dependency results, status, result values, and failure details when present.

Fingerprints

MetricRunFingerprintService returns stable hashes for reproducible runs. The hash is based on canonical serialized formulas, prepared inputs, caller metadata, and the formula dependency graph.

Boundaries

MetricEngine is framework-agnostic. Laravel service providers belong in Laravel adapters or applications.

MetricEngine supports neutral units and precision policies, but currency-specific rules and money value objects belong in finance or accounting packages.

Development

All versions of nexus-metric-engine with dependencies

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Package Version
Requires php Version ^8.3
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