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+# ReactiveXaml
+
+This library is an exploration I've been working on for several weeks on
+combining WPF Model-View-ViewModel paradigm with the Reactive Extensions for
+.NET (Rx). Combining these two make managing concurrency as well as expressing
+complicated interactions between objects possible in a declarative, functional
+way. Put simply, if you've ever had to chain events / callbacks together and
+declare state ints/booleans to keep track of what's going on, Reactive
+Extensions provides a sane alternative.
+
+## What's in this library
+
+``ReactiveCommand`` - an implementation of ICommand that is also a Subject whose
+OnNext is raised when Execute is executed. Its CanExecute can also be defined by
+an IObservable<bool> which means the UI will instantly update instead of
+implementations which rely on RequerySuggested.
+
+``ReactiveAsyncCommand`` - a derivative of ReactiveCommand that encapsulates the
+common pattern of "Fire asynchronous command, then marshal result back onto
+dispatcher thread". Allows you to set a maximum level of concurrency as well
+(i.e. "I only want 3 inflight requests" - when the maximum is reached,
+CanExecute returns false).
+
+``ReactiveObject`` - a ViewModel object based on Josh Smith's implementation,
+that also implements IObservable as a way to notify property changes. It also
+allows a straightforward way to observe the changes of a single property.
+
+``ReactiveValidatedObject`` - a derivative of ReactiveObject that is validated
+via DataAnnotations by implementing IDataErrorInfo, so properties can be
+annotated with their restrictions and the UI will automatically reflect the
+errors.
+
+``ObservableAsPropertyHelper<T>`` - a class that easily lets you convert an
+IObservable<T> into a property that stores its latest value, as well as fires
+NotifyPropertyChanged when the property changes. This is really useful for
+combining existing properties together and replacing IValueConverters, since
+your ViewModels will also be IObservables.
+
+``StopwatchTestScheduler`` - this class allows you to enforce time limits on
+items scheduled on other threads. The main use for this is in unit tests, as
+well as being able to say things in Debug mode like, "If any item runs in the
+Dispatcher scheduler for longer than 400ms that would've made the UI
+unresponsive, crash the application".
+
+## Blend SDK Integration
+
+``AsyncCommandVisualStateBehavior`` - this behavior will watch a
+ReactiveAsyncCommand and transition its target to different states based on the
+command's status - for example, displaying a Spinner while a command is running. 
+
+``FollowObservableStateBehavior`` - this behavior will use the output of an
+IObservable<string> and call VisualStateManager.GoToState on its target; using
+Observable.Merge makes it fairly straightforward to build a state machine based
+on the changes in the ViewModel.
+
+``ObservableTrigger`` - this trigger will fire when an IObservable calls OnNext
+and can be tied to any arbitrary Expression Action.
+
+## Other stuff that's useful
+
+``MemoizingMRUCache`` - this class is non-threadsafe most recently used cache,
+and can be used to cache the results of expensive lookups. You provide the
+function to use to look up values that aren't known, then it will save the
+results. It also allows a "destructor" to be run when an item is released from
+the cache, so you can use this to manage an on-disk file cache as well (where
+the "Get" function downloads a file, then the "Release" function deletes it).
+
+``QueuedAsyncMRUCache`` - this class is by far the most complicated in this
+library, its goals are similar to MemoizingMRUCache, but instead of returning
+the result immediately, it will schedule a Task to run in the background and
+return an IObservable representing the result (a Future). Once the Future
+completes, its result is cached so subsequent requests will come from memory.
+
+The advantage of this class is that subsequent identical requests will block on
+the outstanding one (so if you ask for "foo.com" on 3 separate threads, one of
+them will send out the web request and the other two threads will receive the
+result as well). This class also allows you to place a blocking limit on the
+number of outstanding requests, so that further requests will block until some
+of the inflight requests have been satisfied. 
+
+``IEnableLogger`` - this is an implementation of a simple logger that combines
+some of log4net's syntax with the ubiquity of the Rails logger - any class that
+implements the dummy IEnableLogger interface will able to access a logger for
+that class (i.e. `this.Log().Warn("Something bad happened!");`)