Class SimpleMachineMemory<T>

In-memory implementation of machine state storage for single-instance NodeJS apps.

Best for: Container apps, request-scoped workflows, testing, demos Not for: Multi-instance deployments, persistent workflows, distributed systems

Example

const memory = new SimpleMachineMemory();
const orchestrator = createArvoOrchestrator({
  memory,
  executionunits: 1,
  machines: [workflow]
});

Type Parameters

  • T extends Record<string, any> = Record<string, any>

Implements

Constructors

constructor

Methods

clear lock read unlock write

Constructors

constructor

Methods

clear

lock

  • lock(id): Promise<boolean>

  • Attempts to acquire lock for machine instance

    Parameters

    • id: string

      Machine instance ID

    Returns Promise<boolean>

    Success status of lock acquisition

    Throws

    When id is empty or undefined

read

  • read(id): Promise<null | T>

  • Gets stored state for a machine instance

    Parameters

    • id: string

      Machine instance ID

    Returns Promise<null | T>

    State data or null if not found

    Throws

    When id is empty or undefined

unlock

  • unlock(id): Promise<boolean>

  • Releases lock for machine instance

    Parameters

    • id: string

      Machine instance ID

    Returns Promise<boolean>

    True when lock is released

    Throws

    When id is empty or undefined

write

  • write(id, data): Promise<void>

  • Stores state for a machine instance

    Parameters

    • id: string

      Machine instance ID

    • data: T

      State to store

    Returns Promise<void>

    Throws

    When id is empty/undefined or data is null/undefined

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