arvo-event-handler/dist/ArvoOrchestrator/types.d.ts

Type-safe event handler system with versioning, telemetry, and contract validation for distributed Arvo event-driven architectures, featuring routing and multi-handler support.

import type { ArvoEvent, InferArvoEvent } from 'arvo-core';
import type { Snapshot } from 'xstate';
import type ArvoMachine from '../ArvoMachine';
import type { OrchestrationExecutionMemoryRecord } from '../ArvoOrchestrationUtils/orchestrationExecutionState';
import type { IMachineExectionEngine } from '../MachineExecutionEngine/interface';
import type { IMachineMemory } from '../MachineMemory/interface';
import type { IMachineRegistry } from '../MachineRegistry/interface';
import type { ArvoEventHandlerOtelSpanOptions } from '../types';
/**
 * Discriminated union representing the result of a try operation.
 */
export type TryFunctionOutput<TData, TError extends Error> = {
    type: 'success';
    data: TData;
} | {
    type: 'error';
    error: TError;
};
/**
 * State record persisted in machine memory for orchestration execution.
 *
 * Extends the base orchestration execution record with machine-specific state
 * including XState snapshots, event history, and hierarchical orchestration context.
 */
export type MachineMemoryRecord = OrchestrationExecutionMemoryRecord<{
    /** Unique identifier for this orchestration instance */
    subject: string;
    /**
     * Parent orchestration subject for nested workflows.
     *
     * Enables hierarchical orchestration patterns where one orchestration spawns
     * sub-orchestrations. When the current orchestration completes, its completion
     * event routes back to this parent subject.
     *
     * - Root orchestrations: `null`
     * - Nested orchestrations: parent's subject identifier
     * - Source: `parentSubject$$` field in initialization events
     */
    parentSubject: string | null;
    /**
     * ID of the event that initiated this orchestration workflow.
     *
     * Serves as the root identifier for tracing the complete execution chain.
     * Used as `parentid` for completion events to maintain lineage back to
     * the workflow's origin.
     *
     * - New orchestrations: set to current event's ID
     * - Resumed orchestrations: retrieved from stored state
     */
    initEventId: string;
    /**
     * Current machine execution status.
     *
     * Common values include:
     * - `'active'`: Machine is executing
     * - `'done'`: Machine completed successfully
     * - `'error'`: Machine encountered an error
     * - `'stopped'`: Machine was explicitly stopped
     *
     * Custom values can be defined in the state machine configuration.
     */
    status: string;
    /** Current state value (string for simple states, object for compound states) */
    value: string | Record<string, any> | null;
    /** XState snapshot representing the complete machine state */
    state: Snapshot<any>;
    /**
     * Event history from the last execution session.
     */
    events: {
        /** Event consumed by the machine in the last session */
        consumed: InferArvoEvent<ArvoEvent> | null;
        /** Events produced by the machine in the last session */
        produced: InferArvoEvent<ArvoEvent>[];
    };
    /** Serialized machine definition for debugging and inspection */
    machineDefinition: string | null;
}>;
/**
 * Configuration parameters for ArvoOrchestrator constructor.
 *
 * Defines all required components and settings for orchestrator initialization.
 * For simplified creation with default components, use {@link createArvoOrchestrator}.
 */
export type ArvoOrchestratorParam = {
    /** Computational cost metric assigned to orchestrator operations */
    executionunits: number;
    /** Memory interface for state persistence and retrieval */
    memory: IMachineMemory<MachineMemoryRecord>;
    /** Registry for managing and resolving machine instances */
    registry: IMachineRegistry;
    /** Engine responsible for executing state machine logic */
    executionEngine: IMachineExectionEngine;
    /** Whether to enforce resource locking for concurrent safety */
    requiresResourceLocking: boolean;
    /**
     * Optional domains for system error event routing.
     *
     * Overrides the default fallback sequence of:
     * `[event.domain, self.contract.domain, null]`
     *
     * Controls where structured `sys.*.error` events are emitted when
     * uncaught exceptions occur. Supports symbolic constants from {@link ArvoDomain}.
     *
     * @default undefined - uses standard fallback broadcast domains
     */
    systemErrorDomain?: (string | null)[];
    /** OpenTelemetry span configuration for distributed tracing */
    spanOptions?: ArvoEventHandlerOtelSpanOptions;
};
/**
 * Configuration parameters for creating an orchestrator via factory function.
 *
 * Simplified interface for {@link createArvoOrchestrator} that automatically
 * constructs default registry and execution engine components.
 */
export type CreateArvoOrchestratorParam = Pick<ArvoOrchestratorParam, 'memory' | 'executionunits' | 'spanOptions' | 'systemErrorDomain'> & {
    /**
     * Optional override for resource locking requirement.
     *
     * When undefined, locking is automatically enabled if any machine requires it.
     * Explicitly set to control locking behavior regardless of machine requirements.
     *
     * Resource locking is needed when:
     * - Machines contain parallel states with simultaneous active states
     * - Preventing race conditions in concurrent event processing
     * - Maintaining state consistency across distributed executions
     *
     * @default undefined - auto-determined from machines
     */
    requiresResourceLocking?: ArvoOrchestratorParam['requiresResourceLocking'];
    /**
     * State machines to register with the orchestrator.
     *
     * All machines must share the same source identifier and have unique versions.
     * At least one machine is required.
     */
    machines: ArvoMachine<any, any, any, any, any>[];
};