Yes, you can. There are tons of ways to do it. And there is no need to use the “evil” eval function (please yahoogle why it should be avoided) as pointed out here: http://javascript.about.com/library/bleval.htm var tmpFunc = new Function(codeToRun); tmpFunc(); Whether it was JSON at any stage should be irrelevant.
How can I set up my Activity to be listening to the Service? Is this the best way to approach this problem? You have three major options, as I see it: Polling. The Activity periodically asks the Service for the latest data. IMHO, this option sucks, but it’s certainly possible. Callbacks. Per jax’s answer, the … Read more
Rails 3.1 finally comes with API for this: http://api.rubyonrails.org/v3.1.0/classes/ActiveModel/ObserverArray.html#method-i-disable ORM.observers.disable :user_observer # => disables the UserObserver User.observers.disable AuditTrail # => disables the AuditTrail observer for User notifications. # Other models will still notify the AuditTrail observer. ORM.observers.disable :observer_1, :observer_2 # => disables Observer1 and Observer2 for all models. ORM.observers.disable :all # => disables all observers … Read more
https://stackoverflow.com/a/6270150/3675925 You probably want to look into the observer pattern. Here’s some sample code to get you started: import java.util.*; // An interface to be implemented by everyone interested in “Hello” events interface HelloListener { void someoneSaidHello(); } // Someone who says “Hello” class Initiater { private List<HelloListener> listeners = new ArrayList<HelloListener>(); public void addListener(HelloListener … Read more
Publisher-subscriber vs Observer [closed]
According to tell dont ask, push is better – or more OO. You don’t want to query object for data so you can do something, you want object to do it, because he’s the one who knows his data. Related article about evil getters
Quoting directly from the paper: To illustrate the precise problems of the observer pattern, we start with a simple and ubiquitous example: mouse dragging. The following example traces the movements of the mouse during a drag operation in a Path object and displays it on the screen. To keep things simple, we use Scala closures … Read more
Source : https://plus.google.com/+MichielPijnackerHordijk/posts/QGXF9gRomVi To have multiple triggers for switchMap(), you need to use a custom MediatorLiveData to observe the combination of the LiveData objects – class CustomLiveData extends MediatorLiveData<Pair<String, Integer>> { public CustomLiveData(LiveData<String> code, LiveData<Integer> nbDays) { addSource(code, new Observer<String>() { public void onChanged(@Nullable String first) { setValue(Pair.create(first, nbDays.getValue())); } }); addSource(nbDays, new Observer<Integer>() { … Read more
However it does lack flexibility. Well… actually, this looks like a good design to me if an asynchronous API is what you want. It usually is. Maybe all you need is to switch from stderr to Python’s logging module, which has a sort of publish/subscribe model of its own, what with Logger.addHandler() and so on. … Read more