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50 lines
1.4 KiB
50 lines
1.4 KiB
import { Rpc } from "grain-rpc";
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/**
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* ActionRouter allows to choose what actions to send over rpc. Action are posted as message `{type:
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* "docAction", action }` over rpc.
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*/
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export class ActionRouter {
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private _subscribedTables: Set<string> = new Set();
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constructor(private _rpc: Rpc) {}
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/**
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* Subscribe to send all actions related to a table. Keeps sending actions if table is renamed.
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*/
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public subscribeTable(tableId: string): Promise<void> {
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this._subscribedTables.add(tableId);
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return Promise.resolve();
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}
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/**
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* Stop sending all message related to a table.
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*/
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public unsubscribeTable(tableId: string): Promise<void> {
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this._subscribedTables.delete(tableId);
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return Promise.resolve();
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}
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/**
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* Process a action updates subscription set in case of table rename and table remove, and post
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* action if it matches a subscriptions.
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*/
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public process(action: any[]): Promise<void> {
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const tableId = action[1];
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if (!this._subscribedTables.has(tableId)) {
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return Promise.resolve();
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}
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switch (action[0]) {
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case "RemoveTable":
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this._subscribedTables.delete(tableId);
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break;
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case "RenameTable":
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this._subscribedTables.delete(tableId);
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this._subscribedTables.add(action[2]);
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break;
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}
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return this._rpc.postMessage({type: "docAction", action});
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}
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}
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