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使用Observable,我想用連接的用戶填充流。填充可觀察流
在一本書,我讀了其中爲例非常類似於下面的代碼:
import {Injectable} from '@angular/core';
import {Subject, BehaviorSubject, Observable} from 'rxjs';
import {User} from "./user";
import {IUserService} from "./IUserService";
let initialConnectedUsers: User[] = [];
interface IUsersOperation extends Function {
(users: User[]): User[];
}
@Injectable()
export class UserService implements IUserService{
currentUser: Subject<User> = new BehaviorSubject<User>(null);
newUser: Subject<User> = new Subject<User>();
connectedUsers: Observable<User[]>;
updates: Subject<any> = new Subject<any>();
create: Subject<User> = new Subject<User>();
constructor(){
this.connectedUsers = this.updates
.scan((users: User[], operation: IUsersOperation) => {
return operation(users);
},
initialConnectedUsers)
.publishReplay(1)
.refCount();
this.create.map(function (user: User): IUsersOperation {
return (users: User[]) => {
console.log('foo');
return users.concat(user);
}
}).subscribe(this.updates);
this.newUser.subscribe(this.create);
}
public setCurrentUser(newUser: User): void {
this.currentUser.next(newUser);
this.newUser.next(newUser);
}
}
export var userServiceInjectables: Array<any> = [
UserService
];
但在我的情況下,可觀察到「創造」不用,我沒有看到控制檯日誌。
是什麼*「在我的情況下,可觀察到‘創造’不使用」 *是什麼意思? – martin
你可以在這裏閱讀(https://github.com/ng-book/angular2-rxjs-chat/blob/master/app/ts/services/MessagesService.ts)代碼是什麼啓發了我。在那個代碼中,connectedUsers的等價物被填充了observables創建和更新 – mickaelw