lazy-loading

问题 I am trying to write a Singleton Lazy Loading Pattern. Here is the class: public class IMDBLookup { private static class LazyLoad { private static final IMDBLookup IMDB_LOOKUP; static { IMDB_LOOKUP = new IMDBLookup(); } } public static IMDBLookup getInstance() { return IMDBLookup.LazyLoad.IMDB_LOOKUP; } } I am wondering whether or not I am doing it in a right way? Thanks in advance. 回答1: I prefer to use enum for simplicity. public enum IMDBLookup { INSTANCE; // add fields and methods here. }

问题 I have been working on numerous ngModules, each encapsulating their own set of components, services, directives, etc. They are large. Now that I am ready to string my app up and lazily route each module onto the main router-outlet, I am concerned about overall memory consumption, particularly for low-end devices (tablets on up only, not mobile). So my question is when the Router lazy loads a new module, is the previous lazy loaded module unloaded? I can only find information about JIT, AOT,

问题 I would like to get some clarification regarding lazy loading and session boundaries etc. My code structure is as follows @Entity class A { .... @OneToOne(fetch=LAZY) private B b; .. } @Entity class B { private id; private name; } @Transactional(SUPPORTS) ADao { A findById(int id); } @Transactional(SUPPORTS) LayerDB { A getAForId(int i) { return adao.findById(i); } } //Note that there is no transactional attribute here LayerB { public boolean doSomethingWithAandB(int aId) { A a = LayerDB

问题 I'm new to rxjs, and I'm developing an angular multiselect list component that should render a long list of values (500+). I'm rendering the list based on an UL, I'm iterating over an observable that will render the LI's. I'm thinking about my options to avoid impacting the performance by rendering all the elements at once. But I don't know whether this is possible or not, and if it's possible what is the best operator to use. The proposed solution: On init I load all the data into an

问题 I am developing a Java web application using Hibernate and JSF/primefaces. am sometimes getting errors like 1) an object with same identifier is already associated with session. 2) failed to load lazy initialization * ,no session exist or session is already closed. I know this is due to improper coding in my app. this is the way am doing aap: When a user requests for a page(Let it be a list of Employees). the user will get the employee list page(empployeeList.xhtml) EmployeeListMBean is the

问题 [enter image description here][1]components in -- lazy.module.ts const routes: Routes = [ { path: 'memberdetails', component: MemberDetailsComponent }, { path: 'leaves', component: LeavemanagementComponent }, { path: 'attendance', component: AttendanceComponent } ]; app-routing.module.ts const routes: Routes = [ { path: 'lazy', loadChildren: './lazy.module#LazyModule'}, ]; its working locally but after hosting it when i click on any of these above links i am getting this error ... vendor

问题 Due to server restrictions I am limited to .Net 3.5, I was using lazy loading with Linq to SQL but have since switched to the Entity Framework. L2E does not have lazy loading in 3.5 while L2S did. Is there a way to regenerate the templates somehow to achieve this? 回答1: You have to explicitly call a load method in EF 1 / .NET 3.5. So, before you access a related collection or entity that is not loaded, you have to call something like: Examples: if (!person.Pets.IsLoaded) person.Pets.Load(); if

问题 I usually lazy instantiate my @property objects in their getter methods like this: @interface MyGenericClass : UIViewController @property(nonatomic, readonly) UIImageView *infoImageView // ... @implementation GenericClass - (UIImageView *)infoImageView { if (!_infoImageView) { _infoImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"PlaceholderInfoImage"]]; } return _infoImageView; } But when subclassing, I would often like to override some of the @properties to be more

问题 I have 2 tables: Order [OrderId(PK), OrderShipmentCode, ...] and Shipment[ShipmentId(PK), ShipmentCode, ...] . In Order class, I declared shipment field as follows: @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "OrderShipmentCode", referencedColumnName = "ShipmentCode", insertable = false, updatable = false, nullable = false) private Shipment shipment; When I get the list of Order , the Shipment is also loaded (I saw many separate SELECT queries). But I want the Shipment to be lazy

问题 I am lazy loading the collections, and also because there are so many fields within the person table, I am writing a projection function to retrieve only certain properties. It works with properties, just not collections of other entities. I would be fine if they were loaded in as proxies and i could get them later, but right now it just loads in null. public IList<Person> ListTop40() { var list = _session.CreateCriteria(typeof(Person)) .SetProjection(Projections.ProjectionList() .Add