nats-micro/lib/esm/tokenEventEmitter.js

NATS micro compatible extra-lightweight microservice library

export class TokenEventEmitter {
    constructor() {
        this.handlers = [];
    }
    on(wildcard, handler) {
        this.handlers.push({ wildcard, handler: handler, once: false });
    }
    once(wildcard, handler) {
        this.handlers.push({ wildcard, handler: handler, once: true });
    }
    off(wildcard, handler) {
        const idx = this.handlers.findIndex((h) => h.wildcard === wildcard && h.handler === handler);
        if (idx >= 0)
            this.handlers.splice(idx, 1);
    }
    offAll() {
        this.handlers.splice(0);
    }
    emit(subject, msg) {
        for (const handler of [...this.handlers])
            if (this.matchSubject(handler.wildcard, subject)) {
                handler.handler(msg, subject);
                if (handler.once)
                    this.off(handler.wildcard, handler.handler);
            }
    }
    matchSubject(wildcard, subject) {
        if (subject === wildcard)
            return true;
        const wildcardRegexp = new RegExp('^' +
            wildcard
                .replace('$', '\\$')
                .replace('.', '\\.')
                .replace('*', '[^\\.]+')
                .replace('>', '.+') +
            '$');
        const match = !!subject.match(wildcardRegexp);
        return match;
    }
}
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