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// @flow
import { action } from 'mobx';
import { isEqual, remove } from 'lodash';
import Request from './Request';
export default class CachedRequest extends Request {
_apiCalls = [];
_isInvalidated = true;
execute(...callArgs) {
// Do not continue if this request is already loading
if (this._isWaitingForResponse) return this;
// Very simple caching strategy -> only continue if the call / args changed
// or the request was invalidated manually from outside
const existingApiCall = this._findApiCall(callArgs);
// Invalidate if new or different api call will be done
if (existingApiCall && existingApiCall !== this._currentApiCall) {
this._isInvalidated = true;
this._currentApiCall = existingApiCall;
} else if (!existingApiCall) {
this._isInvalidated = true;
this._currentApiCall = this._addApiCall(callArgs);
}
// Do not continue if this request is not invalidated (see above)
if (!this._isInvalidated) return this;
// This timeout is necessary to avoid warnings from mobx
// regarding triggering actions as side-effect of getters
setTimeout(action(() => {
this.isExecuting = true;
// Apply the previous result from this call immediately (cached)
if (existingApiCall) {
this.result = existingApiCall.result;
}
}), 0);
// Issue api call & save it as promise that is handled to update the results of the operation
this._promise = new Promise((resolve, reject) => {
this._api[this._method](...callArgs)
.then((result) => {
setTimeout(action(() => {
this.result = result;
if (this._currentApiCall) this._currentApiCall.result = result;
this.isExecuting = false;
this.isError = false;
this.wasExecuted = true;
this._isInvalidated = false;
this._isWaitingForResponse = false;
this._triggerHooks();
resolve(result);
}), 1);
return result;
})
.catch(action((error) => {
setTimeout(action(() => {
this.error = error;
this.isExecuting = false;
this.isError = true;
this.wasExecuted = true;
this._isWaitingForResponse = false;
this._triggerHooks();
reject(error);
}), 1);
}));
});
this._isWaitingForResponse = true;
return this;
}
invalidate(options = { immediately: false }) {
this._isInvalidated = true;
if (options.immediately && this._currentApiCall) {
return this.execute(...this._currentApiCall.args);
}
return this;
}
patch(modify) {
return new Promise((resolve) => {
setTimeout(action(() => {
const override = modify(this.result);
if (override !== undefined) this.result = override;
if (this._currentApiCall) this._currentApiCall.result = this.result;
resolve(this);
}), 0);
});
}
removeCacheForCallWith(...args) {
remove(this._apiCalls, c => isEqual(c.args, args));
}
_addApiCall(args) {
const newCall = { args, result: null };
this._apiCalls.push(newCall);
return newCall;
}
_findApiCall(args) {
return this._apiCalls.find(c => isEqual(c.args, args));
}
}
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