unleash-server/dist/lib/features/feature-toggle/configuration-revision-service.js

Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.

import EventEmitter from 'events';
export const UPDATE_REVISION = 'UPDATE_REVISION';
export default class ConfigurationRevisionService extends EventEmitter {
    constructor({ eventStore }, { getLogger, flagResolver, }) {
        super();
        this.logger = getLogger('configuration-revision-service.ts');
        this.eventStore = eventStore;
        this.flagResolver = flagResolver;
        this.revisionId = 0;
    }
    static getInstance({ eventStore }, { getLogger, flagResolver, }) {
        if (!ConfigurationRevisionService.instance) {
            ConfigurationRevisionService.instance =
                new ConfigurationRevisionService({ eventStore }, { getLogger, flagResolver });
        }
        return ConfigurationRevisionService.instance;
    }
    async getMaxRevisionId() {
        if (this.revisionId > 0) {
            return this.revisionId;
        }
        else {
            return this.updateMaxRevisionId();
        }
    }
    async updateMaxRevisionId(emit = true) {
        if (this.flagResolver.isEnabled('disableUpdateMaxRevisionId')) {
            return 0;
        }
        const revisionId = await this.eventStore.getMaxRevisionId(this.revisionId);
        if (this.revisionId !== revisionId) {
            this.logger.debug('Updating feature configuration with new revision Id', revisionId);
            this.revisionId = revisionId;
            if (emit) {
                this.emit(UPDATE_REVISION, revisionId);
            }
        }
        return this.revisionId;
    }
    destroy() {
        ConfigurationRevisionService.instance?.removeAllListeners();
    }
}
//# sourceMappingURL=configuration-revision-service.js.map