gristlabs_grist-core/app/client/components/ClientScope.ts

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import * as dispose from 'app/client/lib/dispose';
import {Storage} from 'app/plugin/StorageAPI';
import {checkers} from 'app/plugin/TypeCheckers';
import {Rpc} from 'grain-rpc';
/**
* Implementation of interfaces whose lifetime is that of the client.
*/
export class ClientScope extends dispose.Disposable {
private _pluginStorage = new Map<string, Storage>();
public create() {
// nothing to do
}
/**
* Make interfaces available for a plugin with a given name. Implementations
* are attached directly to the supplied rpc object.
*/
public servePlugin(pluginId: string, rpc: Rpc) {
// We have just one interface right now, storage. We want to keep ownership
// of storage, so it doesn't go away when the plugin is closed. So we cache
// it.
let storage = this._pluginStorage.get(pluginId);
if (!storage) {
storage = this._implementStorage();
this._pluginStorage.set(pluginId, storage);
}
rpc.registerImpl<Storage>("storage", storage, checkers.Storage);
}
/**
* Create an implementation of the Storage interface.
*/
private _implementStorage(): Storage {
const data = new Map<string, any>();
return {
getItem(key: string): any {
return data.get(key);
},
hasItem(key: string): boolean {
return data.has(key);
},
setItem(key: string, value: any) {
data.set(key, value);
},
removeItem(key: string) {
data.delete(key);
},
clear() {
data.clear();
},
};
}
}