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Informations about the package nexus-event-stream

Nexus EventStream Package

Event Sourcing Engine for Critical Domains (Finance GL, Inventory)

The EventStream package provides an immutable, append-only event store for domains requiring complete audit trails and state replay capability. This is NOT a general-purpose event bus—it's specifically designed for event sourcing in compliance-critical domains.

🎯 Purpose

Event Sourcing is RESERVED for critical domains where you need to answer: "What was the exact state of this entity on [date]?"

Use EventStream for:

Do NOT use EventStream for:

🏗️ Architecture

This package follows the Hybrid Approach described in ARCHITECTURE.md:

The "Feed" View (AuditLogger) vs. "Replay" Capability (EventStream)

Feature AuditLogger EventStream
Purpose User-facing timeline ("what happened") State reconstruction ("replay history")
Storage Outcome-based logs Immutable event log
Query "Show me changes to Customer #123" "What was GL Account 1000 balance on 2024-10-15?"
Complexity Low High (snapshots, projections, upcasters)
Use Case 95% of domains Critical domains only

Key Concepts

  1. Event: Immutable fact that happened (AccountCreditedEvent, StockReservedEvent)
  2. Stream: Ordered sequence of events for an aggregate
  3. Aggregate: Entity whose state is rebuilt from events (e.g., GL Account, Inventory Item)
  4. Projection: Read model built from event stream (e.g., CurrentBalanceProjection)
  5. Snapshot: Cached aggregate state to optimize replay performance
  6. Temporal Query: Query state at specific point in time

📦 Framework-Agnostic Design

This package is pure PHP with no Laravel dependencies. All persistence operations are defined via interfaces:

🔧 Installation

📋 Requirements Satisfied

This package satisfies 104 requirements across 7 categories:

🚀 Usage Example

Publishing Events

Temporal Queries

Building Projections

🔒 Security & Compliance

📊 Performance Characteristics

Operation Target Notes
Event Append < 50ms (p95) With database transaction
Stream Read (1000 events) < 100ms From database
Snapshot Restoration < 10ms In-memory cache
Replay 10K events < 5s For state reconstruction
Temporal Query < 3s For < 10K events

📖 Documentation

Package Documentation

Additional Resources

🤝 Integration Points

⚠️ When NOT to Use

If you only need to show "a timeline of changes" to users, use Nexus\AuditLogger instead. EventStream adds complexity and should only be used when state replay is legally or operationally required.

📝 License

MIT License - see LICENSE file for details.

All versions of nexus-event-stream with dependencies

PHP Build Version
Package Version
Requires php Version ^8.3
psr/log Version ^3.0
symfony/uid Version ^7.0
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