Cyclic Dependency , When Ovveriding Exceptionhandler

I have this code: import {Injectable, ExceptionHandler, SkipSelf, Host, Optional} from '@angular/core'; import {ToastNotification} from '../toast-messages/toastNotification.se

Solution 1:

I still had the same issue when using injector in constructor. What solved it for me was moving the injection part to the call function.

@Injectable()
export classAppExceptionHandlerextendsExceptionHandler{
  private router:Router;
  private toaster:ToastsManager;

  constructor(private injector: Injector) {
    super(new _ArrayLogger(), true);
  }

  call(exception:any, stackTrace?:any, reason?:string):void {
    this.getDependencies();
    console.log(exception);

    if(exception.status === 401){
      // Show loginthis.router.navigate(['/login']);
    }

    // Get error messages if http exception
    let msgs = [];
    if(exception instanceof Response){
      msgs = this.getMessagesFromResponse(exception);
    }else{

      // Otherwise show generic error
      msgs.push('Something went wrong');
    }

    // Show messages
    msgs.forEach((msg) => this.toaster.error(msg));

    super.call(exception, stackTrace, reason);
  }

  private getDependencies(){
    if(!this.router){
      this.router = this.injector.get(Router);
    }
    if(!this.toaster){
      this.toaster = this.injector.get(ToastsManager);
    }
  }

}

Solution 2:

After seeing this question How to Inject my service to ExceptionHandler I think this could be a solution for your problem. If you control one of the classes of the cyclic depenencies, you can just inject the Injector to the constructor and then acquire the instance you actually want:

constructor(injector:Injector) {
  setTimeout(() =>this.someService = injector.get(SomeService));
}