iagate-querykit/dist/simulation-manager.js

QueryKit: lightweight TypeScript query toolkit with models, views, triggers, events, scheduler and adapters (better-sqlite3).

import { QueryKitConfig } from './config';
class SimulationManager {
    static instance;
    active = false;
    virtualState = new Map();
    constructor() { }
    static getInstance() {
        if (!SimulationManager.instance) {
            SimulationManager.instance = new SimulationManager();
        }
        return SimulationManager.instance;
    }
    isActive() {
        return QueryKitConfig.simulation?.isActive() ?? this.active;
    }
    async start(initialState) {
        if (QueryKitConfig.simulation)
            return QueryKitConfig.simulation.start(initialState);
        this.active = true;
        this.virtualState.clear();
        for (const key in initialState) {
            const value = initialState[key];
            if (Array.isArray(value)) {
                this.virtualState.set(key, JSON.parse(JSON.stringify(value)));
            }
            else {
                const { sql, bindings } = value.toSql();
                const exec = QueryKitConfig.defaultExecutor;
                if (!exec) {
                    this.virtualState.set(key, []);
                    continue;
                }
                const result = await exec.executeQuery(sql, bindings);
                const data = result.data;
                this.virtualState.set(key, data);
            }
        }
    }
    stop() {
        if (QueryKitConfig.simulation) {
            QueryKitConfig.simulation.stop();
        }
        this.active = false;
        this.virtualState.clear();
    }
    getStateFor(tableName) {
        if (QueryKitConfig.simulation)
            return QueryKitConfig.simulation.getStateFor(tableName);
        return this.virtualState.get(tableName);
    }
    updateStateFor(tableName, data) {
        if (this.isActive()) {
            if (QueryKitConfig.simulation)
                return QueryKitConfig.simulation.updateStateFor(tableName, data);
            this.virtualState.set(tableName, data);
        }
    }
}
export const simulationManager = SimulationManager.getInstance();