I am new to ninject, I am wondering how I can run custom initizlisation code when constructing the injected objects? ie. I have a Sword class which implements IWeapon, but I want to pass an hit point value to the Sword class constructor, how do I achieve that? Do I need to write my own provider?
A minor question, IKernel kernel = new StandardKernel(new Module1(), new Module2(), ...); what is the actual use of having multiple modules in Kernel? I sorta understand it, but could someone give me a formal explaination and use case?
Thanks a lot!
James
If you have a class Sword with this constructor:
public Sword(int hitPoints)
...
Rather than implementing a Provider, you may prefer to instantiate Swords like this:
IWeapon sword1 = kernel.Get<IWeapon>(With.Parameters.ConstructorArgument("hitPoints", 10));
IWeapon sword2 = kernel.Get<IWeapon>(With.Parameters.ConstructorArgument("hitPoints", 20));
Related
I started working with CodedUI few months before to automate a desktop Application(WPF).
Just checking out for the best ways to create a framework for my Application.
As, I have seen in other automation tools, I feel the heart of an automation framework using any tool(UI Based) is the way it's object Repository is created i.e. how well the UI objects are defined. A Cleaner and well defined Object Repository always proves to be very helpful when it comes to updating your tests.
I am trying to discover the best way to store my UIObjects so that in case of any UI changes in my Application, I have to put minimum effort to update my automation test.
Also, If an Object changes in application, updating it only at one place should solve the problem.
This can be any kind of change like :
->change in just a property(This I feel would be very easy to update in automation Test. The best and Easiet way I feel is to simply update the .uitest file(the xml file) if possible.)
->change in hierarchy and position
->entirely new object added
For the 2nd and 3rd changes, updating scripts become a difficult job, esp if the UIObject is being referred at may places, in many TestMethods, or Modules.
Also, I have generally seen that in Test Methods, Variable Declarations are done to create a reference to the UIMap objects and those variables are further used in the TestMethod Code.
So, in this case If the UI of my application changes, I will have to update the variable decalaration in each of the Test Methods. I want to reduce this effort to changing the variable decalaration only at one place. OfCourse, I cannot have all the code inside only one Test Method. One way that came to my mind is as:
Can't I have simply one common place for all these Variable decalarations. We can give a unique and understandable name to each UIObject e.g.: The decalratoions will look like:
UITabPage UITabPage = this.UIMap.UISimWindow.UISelectEquipmentTabList.UITabPage;
WpfRow UIRow = this.UIMap.UISimWindow.UISelectEquipmentTabList.UITabPage.UIEquipmentDetailsTable.UIRow;
WpfText UIEquipmentTagText = this.UIMap.UISimWindow.UISelectEquipmentTabList.UITabPage.UIEquipmentDetailsTable.UIRow.UITagCell.UIEquipmentTagText;
WpfCheckBox UIEquipmentCheckBox = this.UIMap.UISimWindow.UISelectEquipmentTabList.UITabPage.UIEquipmentDetailsTable.UIRow.UICheckBoxCell.UICheckBox;
....
....
and use these variables wherever required. Hence, In case of any chnages also, there will be only one place where you will need to update thse objects.
But for this, These varaibles must be made STATIC. What can be problem with making these Object Variables static?
Please provide your suggestion on this topic. May be what I am thinking is not possible or practical. I just want to choose the best way to start with before I go too far with the automation scripts and realize later that my approach wasn't a good one.
Thanks in Advance,
Shruti
Look into using descriptive programming instead of using the UIMaps.
Make a static class with generic functions to assist. Going to give you some examples of how to set it up.
For example:
public WinWindow parentwin(string ParentControlName)
{
var parentwin = new WinWindow();
parentwin.SearchProperties.Add("Control Name", ParentControlName);
return parentwin;
}
public WinWindow childwin(string ChildWinControlName, string ParentControlName)
{
var childwin = new WinWindow(parentwin(ParentControlName));
childwin.SearchProperties.Add("Control Name", ChildWinControlName);
return childwin;
}
public WinButton button(string ButtonName,string ChildWinControlName, string ParentControlName)
{
var childwin = childwin(ChildWinControlName,ParentControlName);
var button = new WinButton(childwin);
button.SearchProperties.Add("Name", ButtonName);
}
public void ClickButton(string ButtonName,string ChildWinControlName, string ParentControlName)
{
var button = button(ButtonName,ChildWinControlName,ParentControlName);
Mouse.Click(button);
}
public void ChangeFocus(WinWindow NewFocus)
{
var NewFocus = new NewFocus();
NewFocus.SetFocus();
}
public void ChangeFocus(WinWindow NewFocusChild, string c)
{
var a = new NewFocus();
a.SetFocus();
}
ChangeFocus(childwin("WelcomeForm", "MainForm");
ClickButton("&OK", "WelcomeForm", "MainForm");
I have an annotation which adds some methods and default constructor to annotated class.
I have managed to create a gdsl, to enable autocompletion in idea for methods, but I'm stuck with constructor and documentation is very poor.
Does anyone have any ideas, how to do this?
Maybe I could find a solution, in existing gdsl, but I can't remember any Transformation, related to constructors. Maybe you can remind me of any of them.
def objectContext = context(ctype: "java.lang.Object")
contributor(objectContext) {
if (hasAnnotation("com.xseagullx.SomeAnnotation")) {
// Here I want to add constructor's declaration(with empty arg's)
// …
// And then my methods.
method name: 'someMethod', type: 'void', params: [:]
}
}
EDITED: OK, if it's as #jasp say, and there is no DSL construct for declaring Constructors, I'm still asking for a good documentation sources, other than JB's confluence page. Tutorials and other sources. I'm familiar with embedded dsl's for groovy, grails and gradle.
Need smth. more structured, if it's possible.
All function invocations inside of GroovyDSL are just calls to wrappers around internal IDEA's Program Structure Interface (PCI). However it doesn't cover all of PCI's abilities, including default constructors functionality I believe. One of an evidence for that is singletonTransform.gdsl, which is bundled into IDEA from 9 version and describes #Singleton AST transformation. Here is it's code:
contributor(context()) {
if (classType?.hasAnnotation("groovy.lang.Singleton")) {
property name: "instance",
type: classType?.getQualifiedName() ?: "java.lang.Object",
isStatic: true
}
}
As you can see it doesn't change a constructor and it's visibility, so IDEA will autocomplete this invalid code:
#Singleton class Foo {}
def foo = new Foo()
Futhermore GDSL that describes the semantics of GroovyDSL (which is actually the part of /plugins/groovy/resources/standardDsls/metaDsl.gdsl of IDEA sources) doesn't provide any ability for describing of constructors.
In this case I suggest you use newify transformation which allows you to describe targetClass.name method returning created instance.
I know this is a bit old, but I found myself looking for something similar.
The DSL you are looking for is
method params: [:], constructor: true although I don't understand why you'd need it; if a class doesn't declare any constructors doesn't IDEA always suggest the default one?
I have a library of domain objects which need to be used in the project, however we've found a couple of the classes haven't got an equals or hashCode method implemented.
I'm looking for the simplest (and Grooviest) way to add those methods. Obviously I could create a subclass which only adds the methods, but this would be confusing for developers used to the library and would mean we'd have to refactor existing code.
It is not possible to get the source changed (currently).
If I could edit the class I would just use the #EqualsAndHashCode annotation to carry out an AST transformation (at compile time?), but I can't find a way to instruct the compiler to carry out the transformation on a class which I can't directly annotate.
I'm currently trying to work up an example using the ExpandoMetaClass, so I'd do something like:
MySuperClass.metaClass.hashCode = { ->
// Add dynamic hashCode calculation bits here
}
MySuperClass.metaClass.equals = { ->
// Add dynamic hashCode calculation bits here
}
I don't really want to hand-code the hashCode/equals methods for each class, so I'm looking for something dyamic (like #EqualsAndHashCode) which will work with this.
Am I on the right track? Is there a groovier way?
AST Transforms are only applied at compile time, so you'll get no help from the likes of #EqualsAndHashCode. MetaClass hacks are going to be your only option. That said, there are more-elegant ways to impose MetaClass behavior.
Shameless Self Plug I did a talk about this kind of stuff last year at SpringOne 2GX: http://www.infoq.com/presentations/groovy-app-architecture
In short, you might find benefit in creating extensions (unless you're in Grails) - http://mrhaki.blogspot.com/2013/01/groovy-goodness-adding-extra-methods.html, or by explicitly adding mixins - http://groovy.codehaus.org/Runtime+mixins ... But in general, these are just cleaner ways to do the exact same thing you're already doing.
I am very new to concept of IOC and I understand the fact that they help us resolve different classes in different contexts. Your calling class will just interact with Interface and Interface with decide which implementation to give you and it takes care of newing up the object.
Please do correct me if I am understanding is wrong because my question is based on that:
Now, I see this pattern very often in these projects:
private readonly IEmailService emailService;
private readonly ITemplateRenderer templateRenderer;
private readonly IHtmlToTextTransformer htmlToTextTransformer;
public TemplateEmailService(IEmailService emailService,
ITemplateRenderer templateRenderer,
IHtmlToTextTransformer htmlToTextTransformer)
{
this.emailService = emailService;
this.htmlToTextTransformer = htmlToTextTransformer;
this.templateRenderer = templateRenderer;
}
I understand that this helps using all the implementations of these classes without newing them up and also you don't have to decide WHICH implementaion to get, your IOC decides it for you, right?
but when I code like this, I do not even touch any IOC congiguration files. And again I am usin git for 2 days only but from all the tutorials that I have read, I was expecting my self to configure something which says "Resolve IParent to Child" class. But it works without me doing anything like it. Is it because there is only one implementaion of these interfaces? and If I do have more than one implementations then and then only I will have to configure resolved explicitly?
The code sample you have is a case of Constructor Injection.
In a traditional code, you would have a parameterless constructor, and in it you would "new-up" your objects like this:
IEmailService emailService = new EmailService();
So your code is explictly controlling which implementation gets assigned to the interface variable.
In IoC using constructor injection, control is inverted, meaning the container is "driving the bus" and is creating your TemplateEmailService object. When it is about to create it, the container looks at your constructor parameters (IEmailService , ITemplateRenderer , etc.) and feeds those objects to your class for use.
The IoC container can be configured so that interface A gets fulfilled by implementation B (or C) explicitly. Each one has a way to do it. Or it could do it by convention (IFoo fulfilled by Foo), or even attributes in classes, whatever.
So to answer your question-- you can explicitly define which implementations get used to fulfill certain interfaces. Got to read the IoC container docs for how to.
One more thing - "when you code like this", you technically don't have to be using an IoC container. In fact, your class should not have a direct reference to the container - it will maximize the reusability, and also allow easy testing. So you would wire-up interfaces to implementation classes elsewhere.
I have a question that keeps bothering me. Currently, I have started using Kohana 3.2 Framework. I've written a helper to handle some functionality - I have a number of methods, which are (as it should be) declared STATIC. But, all of these methods are somehow working with the database, so I need to load a model. Currently, every method has a non-static variable like this:
$comment = new Model_Comments;
$comment->addComment("abc");
OK, it seems to be working, but then I wanted to get rid of this redundancy by using class attribute to hold the instance of the model (with is class as well).
Something like this:
private static $comment; // Declaring attribute
self::$comment = new Model_Comment; // This is done within helper __constuct method
self::$comment->addComment("abc"); // And call it within the method.
But, I got failed with: Call to a member function addComment() on a non-object
Question is: is it possible to do it ? Maybe there are some other approaches ?
Sorry for a long story and, thanks in advice! :P
A static method cannot call a non-static method without operating on an instance of the class. So, what you're proposing won't work. There may be a way do accomplish something similar, but what about trying the following:
You could implement the singleton or factory pattern for your "helper" class. Then, you could create the model (as an attribute) as you instantiate/return the instance. With an actual instance of your "helper" class, you won't have to worry about the static scope issues.
In other words, you can create a helper-like class as a "normal" class in your application that, upon creation, always has the necessary model available.
I'd be happy to help further if this approach makes sense.
David