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import { isEqual } from 'lodash';
import { action } from 'mobx';
import Request from './Request';
export default class CachedRequest extends Request {
_apiCalls: any[] = [];
_isInvalidated = true;
execute(...callArgs): this {
// 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 => {
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;
}
static defaultOptions = { immediately: false };
invalidate(options = CachedRequest.defaultOptions): this {
this._isInvalidated = true;
if (options.immediately && this.currentApiCall) {
return this.execute(...this.currentApiCall.args);
}
return this;
}
patch(modify): Promise<this> {
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,
);
});
}
_addApiCall(args: any) {
const newCall = { args, result: null };
this._apiCalls.push(newCall);
return newCall;
}
_findApiCall(args: any) {
return this._apiCalls.find(c => isEqual(c.args, args));
}
}
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