observer-pattern

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Rails audit system with both ActiveResource and ActiveRecord

I have a huge project with both of ActiveRecord and ActiveResource models. I need to implement logging of user activity with these models and also to log changes of model attributes (save object state[详细]

2023-03-05 09:39 分类：问答
Is an EventListener an Observable?

I am currently following a class about Design Patterns and was wondering whether an EventListener is an Observable?[详细]

2023-03-04 20:55 分类：问答
Magento - customer_save_after always fired twice

I am using the customer_save_after event in magento, and all is working fine apart from 1 annoying thing - it is always fired twice.[详细]

2023-03-01 21:35 分类：问答
Observer pattern with delegate and events using an event array

We have a class which manages many queues that store data. I want a user to get notified when new data is added to each of these queues. I\'d like to use the observer pattern using delegate and events[详细]

2023-03-01 07:25 分类：问答
How to add a KVO to MPMoviePlayer currentPlaybackTime?

How can I a开发者_运维技巧dd a KVO to the currentPlaybackTime property of a MPMoviePlayer class?You cannot add a KVO to currentPlaybackTime since the property is not explicitly declared as KVO compati[详细]

2023-02-28 15:16 分类：问答
Should I be using the observer pattern?

I have a situa开发者_如何学运维tion where I think the Observer pattern would make the most sense to use, but I\'m not sure the best way to implement.[详细]

2023-02-27 05:24 分类：问答
How to add observers to an NSManagedObject?

What is the preferred approach to registering observers on an NSManagedObject (since Core Data \"\'owns\' the lifecycle\" of managed objects)?[详细]

2023-02-25 15:31 分类：问答
synchronized(this) and observers notifications

This is related, but definitely not identical, to this famous SO question: Avoid synchronized(this) in Java?[详细]

2023-02-25 02:06 分类：问答
Observer doesn't save order

I\'ve build an observer which listens on the sales_convert_quote_to_order event. The event is triggered and I just want to add a value to an attribute of the order. The attribute is set - as printed i[详细]

2023-02-24 01:10 分类：问答
Observer Pattern in J2ME

I know that Observer pattern is not supported in the J2ME as开发者_如何学运维 Observer and Observable are not in the J2ME.[详细]

2023-02-24 00:34 分类：问答