lazy-loading | 易学教程

Return first non empty list lazyily in Java 8

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问题 I have N lists that return data from a Repository. I want to return the first non empty of these three lists (each one executes a different SQL to fetch data). The catch is that I want to do this lazily, so that I don't need to execute a SQL on the database if I have already found an acceptable result. My code is (modified) @Override public List<Something> dataService(Data data) { return firstNonEmptyList(repository.getDataWayOne(data.getParameter()), repository.getDataWayTwo(data

virtual properties and lazy loading

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问题 By definition virtual properties or methods are methods visible to sub classes to be overridden. But, NHibernate for example uses virtual properties to ensure lazy loading. My question is not about NHibernate, but how you could use virtual properties to achieve lazy loading? Are there any hidden behaviors about virtual properties that I don't know? 回答1: The fact that they are declared virtual allows NHibernate to override the property and create a proxy implementation for it - the proxy in

Lazy loading class methods in PHP

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问题 I have a class with a few rather large methods. In it's basic and most common state most of the functionality is not required though, so I was wondering if there is a way of lazy loading just parts of the class. The methods need to be able to access private/protected members so it would be ideal if the methods were native to the class, however in looking for other solutions I came across this which discusses using private members in callbacks which would be a workable solution (I'd use

Is it absolutely correct that Picasso understands NOT to load if the view has been recycled?

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I'm a little confused: as a rule when async loading images to some sort of list view (whether on Android or iOS or in the abstract on another platform), you essentially must do this .. -- make a note of "which" cell this is (say, #213) -- start getting the image from the net. -- it has loaded from the net. What cell are we now? -- if we are "still" 213, load the image to the image view! -- if we are "no longer" 213, just forget about it. this is a basic in lazy-loading async images. For example, Lucas Rocha explains it perfectly in a famous article here: http://lucasr.org/2012/04/05

How can I make lazy/delay loading work in Linux?

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I got this working great on Windows -- application loads my plugin (C++, Qt), my plugin does a smart search to find an installed JRE, sets the library search path accordingly, and then calls a function in the JVM which forces the jvm.dll to be loaded at that point. (Previous question: How can I deploy a mixed C++/Java (JNI) application? ) Now I'm trying to get it working on Linux. From what I read, lazy linking/loading was the default, so I thought it would just work.... doesn't seem like it. I'd like to avoid dlopen() and dlsym() , LD_LIBRARY_PATH , ldconfig , etc. The idea is that users of

How to lazy load images vertically & horizontally?

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My website has a image grid, which has horizontal and vertical scroll. I want to load images which are vertically places first and then horizontal images, all of them lazily. In other words, when user scroll down vertical images should load lazily and when user scrolls horizontally images the horizontal images should load lazily. I tried using lazyload , but I'm not able to use get it working for both vertical and horizontal images container. Only horizontal or vertical scrolling is working at a time. I want both of them to work! My test code is as follows, <script src="http://ajax.googleapis

Linq repository and GetTable<T>()

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问题 I'm following the fairly standard L2S repository pattern, using the following as one of the methods public IEnumerable<T> GetAllByFilter(Func<T, bool> expression) { return _dataContext.GetTable<T>().Where(expression); } I'm a bit miffed to see that the call to GetTable appears to literally get the table, with the Where expression presumably evaluated in-memory afterwards. So a simple call like var order = GetAllByFilter(o => o.OrderNumber == 1); which should only ever return one record, is

Lazy Loading in gridview

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问题 this is gridview that get image from json. I successfully with it. But when I get it from server it has a lot of images, that mean all images from server. I want to once load is 12 images. How can I limit number of images to load? Please help me briefly because I blind with lazy loading. If the code below not not enough. here is full source http://pastie.org/5583485 in this url, 50 is a number of image to load, i can limit number of image by this value whatever i want. but i just can load

NHibernate Lazy Initialized collection on WCF Wire

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问题 My object looks something like this: class { int a; object b; IList<string> c; } All the fields are getting populated from the database and the collection is getting lazy initialization which is desirable. Now, my problem is that I want to send this object to the web service. But since the collection is lazily loaded, am not able to do it. Can somebody please give me an idea or a direction or some example code which I can look into for my problem. I want a generic way to force initialization

Directive for lazyloading data in AngularJS

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问题 I'm currently learning Angular and trying to figure out a good pattern for lazyloading data and structuring code. I'm making an responsive web application, and I would like do be able to define that some parts of the web-page are to be hidden from the view (preferably using media queries). The data fetched for the hidden directives or views is then redundant. The difference can be substantial from a desktop to a mobile view, and I would like the application to be as light as possible on the