redis-smq/dist/esm/src/lib/event-bus/event-bus.js

A simple high-performance Redis message queue for Node.js.

import { CallbackEmptyReplyError, EventBusRedis, EventEmitter, PanicError, } from 'redis-smq-common';
import { Configuration } from '../../config/index.js';
import { EventBusInstanceLockError } from './errors/index.js';
export class EventBus extends EventEmitter {
    instance = null;
    locked = false;
    init = (cb) => {
        this.getSetInstance((err) => cb(err));
    };
    getInstance() {
        if (!this.instance)
            return new PanicError(`Use first getSetInstance() to initialize the EventBusRedisInstance class`);
        return this.instance;
    }
    getSetInstance(cb) {
        if (!this.locked) {
            if (!this.instance) {
                this.locked = true;
                const redisConfig = Configuration.getSetConfig().redis;
                EventBusRedis.createInstance(redisConfig, (err, inst) => {
                    this.locked = false;
                    if (err)
                        cb(err);
                    else if (!inst)
                        cb(new CallbackEmptyReplyError());
                    else {
                        this.instance = inst;
                        this.instance.on('error', (err) => this.emit('error', err));
                        cb(null, this.instance);
                    }
                });
            }
            else
                cb(null, this.instance);
        }
        else
            cb(new EventBusInstanceLockError());
    }
    shutdown = (cb) => {
        if (this.instance) {
            this.instance.removeAllListeners();
            this.instance.shutdown(() => {
                this.instance = null;
                cb();
            });
        }
        else
            cb();
    };
}
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