delegation

Distinguishing between delegation, composition and aggregation (Java OO Design)

由 谁说胖子不能爱 提交于 2019-11-27 08:59:38
问题 I am facing a continuing problem distinguishing delegation, composition and aggregation from each other, and identifying the cases where it's the best to use one over the other. I have consulted a Java OO Analysis and Design book, but my confusion still remains. The main explanation is this: Delegation : When my object uses another object's functionality as is without changing it. Composition : My object consists of other objects which in turn cannot exist after my object is destroyed-garbage

LogonUser and delegation

由 别等时光非礼了梦想. 提交于 2019-11-27 07:09:01
问题 I'm using the LogonUser win32 api: token = LogonUser(...) WindowsIdentity newId = new WindowsIdentity(token); WindowsImpersonationContext impersonatedUser = newId.Impersonate(); However when calling a WCF service after this I'm not able to use the impersonated identity. I think this is because impersonatedUser.ImpersonationLevel equals Impersonation. Is this the reason? Is a level of ImpersonationLevel.Identification what I need? How to get such a level? 回答1: I don't know if this will work

Need to Impersonate user forAccessing Network resource, Asp.Net Account

由 人走茶凉 提交于 2019-11-27 06:23:18
问题 I need to access a network resource on which only a given Domain Account has access. I am using the LogonUser call, but get a "User does not have required priviliege" exception, as the web application is running with the asp.net account and it does not have adequate permissions to make this call. Is there a way to get around it? Changing the identity or permissions of the ASP.Net account is not an option as this is a production machine with many projects running. Is there a better way to

What is the purpose of a delegation pattern?

由 自闭症网瘾萝莉.ら 提交于 2019-11-27 00:51:04
问题 I was looking through the source to SensorManager in Android and found that when you register a SensorEventListener the SensorManager passes control of the listener to a ListenerDelegate . I only bring this up as an example. I read the Wikipedia article on delegate programming but I am still not sure of its purpose. Why would one use a 'delegate'? How does it help the control flow of a program? What are the disadvantages of using (or not) one? Is it most practical for use with listeners? Edit

When to use delegation instead of inheritance? [closed]

由 家住魔仙堡 提交于 2019-11-26 22:37:15
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 12 months ago . Could someone please explain when would I want to use delegation instead of inheritance? 回答1: When you want to "copy"/Expose the base class' API, you use inheritance. When you only want to "copy" functionality, use delegation. One example of this: You want to create a Stack out

What is meant by .delegate=self?

由 橙三吉。 提交于 2019-11-26 21:30:51
Could anyone explain the meaning of someViewController.delegate = self and self.delegate ? Where do they help us? Delegates send messages to you. For example: if you use the accelerometer delegate, you will get messages about the accelerometer. If you use that new neutrino-detection delegate, you will get messages about any neutrinos detected in the area. If you use PopUps, PopUps send you messages. And the way that is done, is with the PopUp's delegate. There are many, many examples. So, delegates send messages. It's that simple. You might ask, "WHERE does it send these messages?" The answer

Steps to enable double-hop delegation in IIS7 windows 2008

由 前提是你 提交于 2019-11-26 21:26:45
问题 my ASP.NET web application uses windows authentication on our intranet. I want it to be able to make a server-side http request to another server on the same domain that also requires windows authentication. I've followed the instructions on temporarily impersonating the authenticated user when making the additional request here: http://msdn.microsoft.com/en-us/library/ff647404.aspx Using code like this: using System.Security.Principal; // Obtain the authenticated user's Identity

jQuery .on() and .delegate() doesn't work on iPad

由 橙三吉。 提交于 2019-11-26 19:50:41
问题 If you try this snippet on desktop, everything works. Whenever you try it on iPad , it won't do anything. $('body').on('click', '#click', function() { alert("This alert won't work on iPad"); }); div { font-size: 24px; } <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id="click">Click here</div> Simple .click() handler works, but it isn't what I want. The same applies for .delegate(); and .live() Is it a bug or something? 回答1: It's a Safari mobile

What is Protocol Oriented Programming in Swift? What added value does it bring?

由 拟墨画扇 提交于 2019-11-26 18:03:51
问题 From Apple's own website: "At the heart of Swift's design are two incredibly powerful ideas: protocol-oriented programming and first class value semantics." Can someone please elaborate what exactly is protocol oriented programming, and what added value does it bring? I have read this and watched the Protocol-Oriented Programming in Swift video, but coming from an Objective-C background still haven't understood it. I kindly ask for a very plain English answer along with code snippets &

Why aren&#39;t superclass __init__ methods automatically invoked?

由 断了今生、忘了曾经 提交于 2019-11-26 14:05:17
Why did the Python designers decide that subclasses' __init__() methods don't automatically call the __init__() methods of their superclasses, as in some other languages? Is the Pythonic and recommended idiom really like the following? class Superclass(object): def __init__(self): print 'Do something' class Subclass(Superclass): def __init__(self): super(Subclass, self).__init__() print 'Do something else' The crucial distinction between Python's __init__ and those other languages constructors is that __init__ is not a constructor: it's an initializer (the actual constructor (if any, but, see
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