lazy-loading

问题 I'm trying to get lazyloading with lazysizes and picturefill to work. The lazyloading itself works if I just use a basic image: <img class=lazyload data-srcset="http://placehold.it/301x301"> If I check the network tab in chrome, I can see that the image was loaded after the red line, so everything is fine: Now I added a <picture> element with my responsive images and try to load that also lazy: <picture> <!--[if IE 9]><video style="display: none;"><![endif]--> <source srcset="http://placehold

问题 I'm trying to get lazyloading with lazysizes and picturefill to work. The lazyloading itself works if I just use a basic image: <img class=lazyload data-srcset="http://placehold.it/301x301"> If I check the network tab in chrome, I can see that the image was loaded after the red line, so everything is fine: Now I added a <picture> element with my responsive images and try to load that also lazy: <picture> <!--[if IE 9]><video style="display: none;"><![endif]--> <source srcset="http://placehold

问题 JSON Serialization (ASP.Net Web API) fails because of self-referencing loop (it’s a common problem, Reason: an entity being requested lazy loads child entities and every child has a back reference to parent entity). Work around I found, but doesn’t help me: Use [JsonIgnore] for navigation properties to be ignored: This solution works but doesn’t apply in my case. For Example: To get a Customer information along with his Orders, I would quickly add [JsonIgnore] to Customer property in Order

问题 I know this is a widely discussed issue, but I'd like to ask a question anyway. I have lists (with BaseAdapters) in my app, all of which obtain images from the web. Now I've tried: 1) AsyncTasks in which the image is downloaded first, stored into a cache, and then displayed on the onPostExecute method. The image is obtained from the cache subsequently. 2) Nostra's Universal Image Loader. 3) Fedor's LazyList. And; 4) Novoda's ImageLoader. All of these methods claim to make the loading of

问题 i was just wondering if someone could explain this code for me so i can actually learn from it. I am trying to make my app have a scroller that scrolls left to right with loads of pictures (from internet) but the thing is, it must have lazy loading. so i did some tutorials and figured out how to do it but i truly don't understand it. So i was hoping some kind soul would explain how to lazy load step by step This is the code i had learned from the tutorials: -(void)scrollViewDidScroll:

问题 Address has many-to-one relationship with person like : Person : @Id @Column(name="personid") private Long personId; private String firstName; private String lastName; private String email; @OneToMany(cascade = CascadeType.ALL,mappedBy="person",targetEntity=Address.class,fetch=FetchType.LAZY) private List addressArray=new ArrayList<>(); public Person() { } and Address : @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name="personId") private Person person; I want to access person's firstname

问题 I lazy load all my members. I have been doing this for a while and simply taken lazy load to be a good thing at face value. Let's say we have public class SomeClass { public int anInt; public SomeReferenceType member1; public SomeClass() { //initialize members in constructor when needed (lazy load) anInt = new int(); member1 = new SomeReferenceType(); } } Are there any disadvantages to doing things this way? Is this a proper lazy load pattern? Does it make sense to lazy load a value type

问题 I have read some articles that state that IEnumerable used to mimic stored procedures or restrict your database. Lost lazy loading ability on the external provider. Where as IQueryable to give developers more flexibility. Lazy loading is there. In terms of performance, both consume a significant amount of performance .. so which one is more preferable? 回答1: From the perspective of a Repository Pattern, you can think of it this way: Use an eager loading IEnumerable when you want to pass an

问题 I just found out that lazy loading in Entity Framework only works from the thread that created the ObjectContext . To illustrate the problem, I did a simple test, with a simple model containing just 2 entities : Person and Address . Here's the code : private static void TestSingleThread() { using (var context = new TestDBContext()) { foreach (var p in context.Person) { Console.WriteLine("{0} lives in {1}.", p.Name, p.Address.City); } } } private static void TestMultiThread() { using (var

问题 What I have: @Entity public class MyEntity { @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true) @JoinColumn(name = "myentiy_id") private List<Address> addreses; @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true) @JoinColumn(name = "myentiy_id") private List<Person> persons; //.... } public void handle() { Session session = createNewSession(); MyEntity entity = (MyEntity) session.get(MyEntity.class, entityId); proceed(session);