I have a ManagerClass with a Singleton implementation inside, I get the instance by calling ManagerClass.getInstance().
Can I get that same instance by just having the class name as a string?
I have tried something like:
var theInstance:* = getDefinitionByName("ManagerClass").getInstance as Class;
theInstance.doTrace(); // I get a 1009 error here
well - im dealing with singletons because the application that I'm working on is written in cairngorm, and a whole bunch of things have to be singletons in it.
in regards to why I need to "pass the class names" instead of hardcoding them - is for exact that reason - I don't want to hardcode anything in. this application is 5 years in developement, and now would not be good time to switch it to RobotLegs and such.
haha - yea, you're right - i forgot the () after getInstance. Must be the lack of sleep... Now it works!!!!
Sure why not make a Singleton manager (similar to the Flex core mx.core.Singleton class) that registers these classes and handles if they're null.
Similar to here :
http://segfaultlabs.com/devlogs/overriding-default-flexair-mxmanagers-implementations
Related
I have a question that's nagging me.
Is it possible to use multiple methods of an
instance , without writing the name. I dont
mean static methods.
Language : java
For example: object name bibo of class manager
the class has three methods
- fire
- hiring
- raise
And what i want is like this:
bibo.fire();
.hiring();
.raise();
I'm asking cause I saw this in another project, but cant recall how it was done or what project it was.
Do anyone knows about the class which has the common function which we generally use while developing web application. I have no idea what you may call it, it may be the utility class or common function class. Just for reference, this class can have some common function like:
Generate Random number
Get the file path
Get the concatinated string
To check the string null or empty
Find controls
The idea is to have the collection of function which we generally use while developing asp.net application.
No idea what you are really asking, but there already are ready-made methods for the tasks you write in various library classes:
Random.Next() or RNGCryptoServiceProvider.GetBytes()
Path.GetDirectoryName()
String.Concat() or simply x + y
String.IsNullOrEmpty()
Control.FindControl()
Gotta love the intarwebs - An endless stream of people eager to criticize your style while completely failing to address the obvious "toy" question. ;)
Chris, you want to inherit all your individual page classes from a common base class, which itself inherits from Page. That will let you put all your shared functionality in a single place, without needing to duplicate it in every page.
In your example it looks like utility class - it is set of static functions.
But I think that you should group it in few different classes rather than put all methods in one class - you shouldn't mix UI functions(6) with string functions(3,4), IO functions (2) and math(1).
As Mormegil said - those functions exists in framework, but if you want to create your own implementations then I think that for part of your function the best solution is to create extension method.
I'm tasked with updating a Flex project created by an outside contractor and in the Actionscript is the following chunk:
CONFIG::FLASH_10_1
{
//Some code here
}
I've never seen this type of structure before and I'm having a heck of a time trying to search for it on Google - I've found what it means in just about every programming language except AS3. Can anyone shed some light on this?
I'm pretty sure this relates to the conditional compilation features of the Flex compiler.
So, if you add a compiler argument, like this:
-define=CONFIG::FLASH_10_1
I bet that error will go away.
Although this is not the same context, to answer the question of what double colon "::" means in AS3...
It is a namespace accessor.
For example, the AS3 Vector.<T> type actually has a runtime type name of __AS3__.vec::Vector.<T>, where __AS3__.vec is the custom namespace. You can also use custom namespaces for members and access them on objects in AS3 using the syntax object.custom_namespace::membername. public and private are built in namespaces, so technically you could access public members like object.public::membername, as in:
var a:Array = [0,1];
trace(a.public::length); //prints 2
Not a flex / AS3 guru - this thread talks about the '::' being used as a "Namespace accessor":
Thread on Actionscript FAQs
I am sort of new to Unity all seems to be fine but I am kind of lost when to use
ResolvedParameter in Unity.
Googled and looked on MSDN but still cannot understand when to use it.
Do you have a simple example that could illustrate it's use.
Thanks a lot for your help
You may wish to configure a Type with constructor parameters of a resolved service and a string. In this case you would use ResolvedParameter.
Container.RegisterType<IRepository, Repository>(
new InjectionConstructor(
new ResolvedParameter<IClassifier>(),
"ConnectionString"));
It's for method injection; see Entering Configuration Information on MSDN. Scroll down to "Dynamically Configuring Constructor, Property, and Method Injection" and note that the ResolvedParameter is actually a parameter to the InjectionMethod constructor.
I've never encountered a need to use it. Constructor injection will solve 95% of your issues, and property injection will solve the other 5%. (Caveat: I've only used Unity on a couple of projects, so I don't claim to be an expert.)
As I see it its to be used when you have a constructor where at least one parameter can not be obtained from the container while the rest can. In such a situation you declare how to resolve each ctor parameter when actually creating a new instance of that type.
Container.RegisterSingleton<IConnectionManager, ConnectionManager>(new InjectionConstructor(new ResolvedParameter<INetworkClientFactory>(), Container.Resolve<IBackoffAlgorithm>(), 10));
In my example, the IConnectionManager instance obtains the first parameter from the container (via ResolvedParameter), the 2nd one via Container.Resolve<>, and the 3rd one is a hard-coded integer.
ResolvedParameter should behave equal to a direct Container.Resolve<> but looks a tad cleaner.
I'm re-writing an MXML item renderer in pure AS. A problem I can't seem to get past is how to have each item renderer react to a change on a static property on the item renderer class. In the MXML version, I have the following binding set up on the item renderer:
instanceProperty={callInstanceFunction(ItemRenderer.staticProperty)}
What would be the equivalent way of setting this up in AS (using BindingUtils, I assume)?
UPDATE:
So I thought the following wasn't working, but it appears as if Flex is suppressing errors thrown in the instanceFunction, making it appear as if the binding itself is bad.
BindingUtils.bindSetter(instanceFunction, ItemRenderer, "staticProperty");
However, when instanceFunction is called, already initialized variables on the given instance are all null, which was the cause of the errors referenced above. Any ideas why this is?
You have 2 options that I am aware of:
Option 1
You can dig into the code that the flex compiler builds based on your MXML to see how it handles binding to static properties. There is a compiler directive called -keep-generated-actionscript that will cause generated files to stick around. Sleuthing through these can give you an idea what happens. This option will involve instantiating Binding objects and StaticPropertyWatcher objects.
Option 2
There is staticEventDispatcher object that gets added at build time to classes containing static variables see this post http://thecomcor.blogspot.com/2008/07/adobe-flex-undocumented-buildin.html. According to the post, this object only gets added based on the presence of static variables and not getter functions.
Example of Option 2
Say we have a class named MyClassContainingStaticVariable with a static variable named MyStaticVariable and another variable someobject.somearrayproperty that we want to get updated whenever MyStaticVariable changes.
Class(MyClassContainingStaticVariable).staticEventDispatcher.addEventListener(
PropertyChangeEvent.PROPERTY_CHANGE,
function(event:PropertyChangeEvent):void
{
if(event.property == "MyStaticVariable")
{
someobject.somearrayproperty = event.newValue as Array;
}
});
I think you need to respond to the "PropertyChanged" event.
If you're going to do that, use a singleton instead of static. I don't think it will work on a static. (If you have to do it that way at all, there are probably a couple ways you could reapproach this that would be better).
var instance:ItemRenderer = ItemRenderer.getInstance();
BindingUtils.bindProperty(this, "myProperty", instance, "theirProperty");
After fiddling with this for a while, I have concluded that this currently isn't possible in ActionScript, not even with bindSetter. It seems there are some MXML-only features of data bindings judging by the following excerpt from the Adobe docs (though isn't it all compiled to AS code anyways)?
You cannot include functions or array
elements in property chains in a data
binding expression defined by the
bindProperty() or bindSetter() method.
For more information on property
chains, see Working with bindable
property chains.
Source: http://livedocs.adobe.com/flex/3/html/help.html?content=databinding_7.html
You can create a HostProxy class to stand in for the funciton call. Sort of like a HostFunctionProxy class which extends from proxy, and has a getProperty("functionInvokeStringWithParameters") which will invoke the function remotely from the host, and dispatch a "change" event to trigger the binding in typical [Bindable("change")] Proxy class.
You than let the HostProxy class act as the host, and use the property to remotely trigger the function call. Of course, it'd be cooler to have some TypeHelperUtil to allow converting raw string values to serialized type values at runtime for method parameters (splitted by commas usually).
Example:
eg.
var standInHost:Object = new HostFunctionProxy(someModelClassWithMethod, "theMethodToCall(20,11)");
// With BindingUtils.....
// bind host: standInHost
// bind property: "theMethodToCall(20,11)"
Of course, you nee to create such a utlity to help support such functionality beyond the basic Flex prescription. It seems many of such (more advanced) Flex bindings are usually done at compile time, but now you have to create code to do this at runtime in a completely cross-platform Actionscript manner without relying on the Flex framework.