nestjs-resilience
Version:
A module for improving the reliability and fault-tolerance of your NestJS applications
37 lines (36 loc) • 1.32 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.DedupeStrategy = void 0;
const base_strategy_1 = require("./base.strategy");
const rxjs_1 = require("rxjs");
class DedupeStrategy extends base_strategy_1.Strategy {
constructor(options) {
super(Object.assign(Object.assign({}, DedupeStrategy.DEFAULT_OPTIONS), options));
this.activeCommands = new Map();
}
process(observable, command, ...args) {
const key = this.options.keyFn(args, command);
if (this.activeCommands.has(key)) {
return this.activeCommands.get(key).asObservable();
}
const result = observable;
const subject = new rxjs_1.Subject();
this.activeCommands.set(key, subject);
return result.pipe((0, rxjs_1.tap)({
next: res => {
subject.next(res);
subject.complete();
this.activeCommands.delete(key);
},
error: err => {
subject.error(err);
subject.complete();
this.activeCommands.delete(key);
}
}));
}
}
exports.DedupeStrategy = DedupeStrategy;
DedupeStrategy.DEFAULT_OPTIONS = {
keyFn: (args, command) => [DedupeStrategy.name, command, JSON.stringify(args)].join('/')
};