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import { Deserializable } from '../client/util/SerializationHelper';
import { FieldWaiting } from './Doc';
import { primitive, serializable } from 'serializr';
import { observable, action, runInAction } from 'mobx';
import { DocServer } from '../client/DocServer';
import { RefField } from './RefField';
import { ObjectField } from './ObjectField';
import { Id, Copy, ToScriptString, ToString } from './FieldSymbols';
import { scriptingGlobal } from '../client/util/ScriptingGlobals';
import { Plugins } from './util';
function deserializeProxy(field: any) {
if (!field.cache) {
field.cache = DocServer.GetCachedRefField(field.fieldId) as any;
}
}
@Deserializable('proxy', deserializeProxy)
export class ProxyField<T extends RefField> extends ObjectField {
constructor();
constructor(value: T);
constructor(fieldId: string);
constructor(value?: T | string) {
super();
if (typeof value === 'string') {
//this.cache = DocServer.GetCachedRefField(value) as any;
this.fieldId = value;
} else if (value) {
this.cache = value;
this.fieldId = value[Id];
}
}
[Copy]() {
if (this.cache) return new ProxyField<T>(this.cache);
return new ProxyField<T>(this.fieldId);
}
[ToScriptString]() {
return 'invalid';
}
[ToString]() {
return 'ProxyField';
}
@serializable(primitive())
readonly fieldId: string = '';
// This getter/setter and nested object thing is
// because mobx doesn't play well with observable proxies
@observable.ref
private _cache: { readonly field: T | undefined } = { field: undefined };
private get cache(): T | undefined {
return this._cache.field;
}
private set cache(field: T | undefined) {
this._cache = { field };
}
private failed = false;
private promise?: Promise<any>;
@action
value(): T | undefined | FieldWaiting<T> {
if (this.cache) return this.cache;
if (this.failed) return undefined;
const cached = DocServer.GetCachedRefField(this.fieldId) as T;
if (cached !== undefined) {
setTimeout(action(() => (this.cache = cached)));
} else if (!this.promise) {
this.promise = DocServer.GetRefField(this.fieldId).then(
action((field: any) => {
this.promise = undefined;
this.cache = field;
this.failed = field === undefined;
return field;
})
) as FieldWaiting<T>;
}
return cached ?? this.promise;
}
promisedValue(): string {
return !this.cache && !this.failed && !this.promise && !DocServer.GetCachedRefField(this.fieldId) ? this.fieldId : '';
}
setPromise(promise: any) {
this.promise = promise;
}
@action
setValue(field: any) {
this.promise = undefined;
this.cache = field;
if (field === undefined) this.failed = true;
return field;
}
}
export namespace ProxyField {
let useProxy = true;
export function DisableProxyFields() {
useProxy = false;
}
export function EnableProxyFields() {
useProxy = true;
}
export function WithoutProxy<T>(fn: () => T) {
DisableProxyFields();
try {
return fn();
} finally {
EnableProxyFields();
}
}
export function initPlugin() {
Plugins.addGetterPlugin((doc, _, value) => {
if (useProxy && value instanceof ProxyField) {
return { value: value.value() };
}
});
}
}
function prefetchValue(proxy: PrefetchProxy<RefField>) {
return proxy.value() as any;
}
@scriptingGlobal
@Deserializable('prefetch_proxy', prefetchValue)
export class PrefetchProxy<T extends RefField> extends ProxyField<T> {}
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