Top "Observer-pattern" questions

How to combine two live data one after the other?

I have next use case: User comes to registration form, enters name, email and password and clicks on register button. …

android observer-pattern android-room android-architecture-components android-livedata

C#: events or an observer interface? Pros/cons?

I've got the following (simplified): interface IFindFilesObserver { void OnFoundFile(FileInfo fileInfo); void OnFoundDirectory(DirectoryInfo directoryInfo); } class FindFiles { IFindFilesObserver _observer; // ... } ...and …

c# events observer-pattern

Rails 3: How to identify after_commit action in observers? (create/update/destroy)

I have an observer and I register an after_commit callback. How can I tell whether it was fired after …

ruby-on-rails ruby-on-rails-3 transactions observer-pattern

C++11 observer pattern (signals, slots, events, change broadcaster/listener, or whatever you want to call it)

With the changes made in C++11 (such as the inclusion of std::bind), is there a recommended way to implement …

c++ boost c++11 signals observer-pattern

MediatorLiveData or switchMap transformation with multiple parameters

I am using Transformations.switchMap in my ViewModel so my LiveData collection, observed in my fragment, reacts on changes of …

android observer-pattern android-architecture-components android-livedata android-viewmodel

Rxjs Subject next() after complete()

I have service which connects with Subject() to do paging. I'm using next(newData) to pass to subject, which keeps …

javascript rxjs observable observer-pattern rxjs5

C# Plugin Architecture with interfaces share between plugins

I divided my problem into a short and a long version for the people with little time at hand. Short …

c# plugins interface observer-pattern

Pros and Cons of Listeners as WeakReferences

What are the pros and cons of keeping listeners as WeakReferences. The big 'Pro' of course is that: Adding a …

java design-patterns observer-pattern weak-references

When should I remove observers? Error about deallocating objects before removing observers

I am trying to use key-value observing in one of my classes. I register the observers in the init method …

objective-c cocoa-bindings observer-pattern key-value-observing

Rails 3 Observer -- looking to learn how to implement an Observer for multiple models

I'd like to add an Auditor Observer which does an action anytime after_create for 3 models (books, characters, authors)... I …

ruby-on-rails ruby-on-rails-3 observer-pattern