apollo-link-dedup
Version:
Deduplicates queries that are currently on the wire
66 lines (63 loc) • 2.9 kB
JavaScript
import { __extends } from 'tslib';
import { Observable, ApolloLink } from 'apollo-link';
var DedupLink = (function (_super) {
__extends(DedupLink, _super);
function DedupLink() {
var _this = _super !== null && _super.apply(this, arguments) || this;
_this.inFlightRequestObservables = new Map();
_this.subscribers = new Map();
return _this;
}
DedupLink.prototype.request = function (operation, forward) {
var _this = this;
if (operation.getContext().forceFetch) {
return forward(operation);
}
var key = operation.toKey();
if (!this.inFlightRequestObservables.get(key)) {
var singleObserver_1 = forward(operation);
var subscription_1;
var sharedObserver = new Observable(function (observer) {
if (!_this.subscribers.has(key))
_this.subscribers.set(key, new Set());
_this.subscribers.get(key).add(observer);
if (!subscription_1) {
subscription_1 = singleObserver_1.subscribe({
next: function (result) {
var subscribers = _this.subscribers.get(key);
_this.subscribers.delete(key);
_this.inFlightRequestObservables.delete(key);
if (subscribers) {
subscribers.forEach(function (obs) { return obs.next(result); });
subscribers.forEach(function (obs) { return obs.complete(); });
}
},
error: function (error) {
var subscribers = _this.subscribers.get(key);
_this.subscribers.delete(key);
_this.inFlightRequestObservables.delete(key);
if (subscribers) {
subscribers.forEach(function (obs) { return obs.error(error); });
}
},
});
}
return function () {
if (_this.subscribers.has(key)) {
_this.subscribers.get(key).delete(observer);
if (_this.subscribers.get(key).size === 0) {
_this.inFlightRequestObservables.delete(key);
if (subscription_1)
subscription_1.unsubscribe();
}
}
};
});
this.inFlightRequestObservables.set(key, sharedObserver);
}
return this.inFlightRequestObservables.get(key);
};
return DedupLink;
}(ApolloLink));
export { DedupLink };
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