factory

Returning a Type as a Variable in TypeScript

由 你。 提交于 2020-07-10 06:22:28
问题 I'm currently writing a class factory in TypeScript, and would like to return a type as the output of a function. Although TypeScript handles types as an input--i.e. generics--beautifully, I've not yet found a way to handle types as an output. This StackOverflow question on class factories offered a particularly helpful solution, but did not fully answer my question. Given the below structure, function factory(someVar: any) { return class A { // Do something with someVar that makes this class

Look up service implementations dynamically

由 自作多情 提交于 2020-05-28 04:50:11
问题 Our Angular application has a service which can have different implementations, aka. “strategies”. For simplicity, let’s assume it’s an “event reporting” service. The event reporting service has a function for reporting information. Depending on a runtime preference, the reporting can either turned off, go to the console , or be sent to a REST API, or go somewhere else. Using pure TS, this would look like: interface IReporter { report (message: string): void; } class NoReporter implements

Look up service implementations dynamically

由 允我心安 提交于 2020-05-28 04:48:44
问题 Our Angular application has a service which can have different implementations, aka. “strategies”. For simplicity, let’s assume it’s an “event reporting” service. The event reporting service has a function for reporting information. Depending on a runtime preference, the reporting can either turned off, go to the console , or be sent to a REST API, or go somewhere else. Using pure TS, this would look like: interface IReporter { report (message: string): void; } class NoReporter implements

Factory pattern using unique_ptr in c++

由 China☆狼群 提交于 2020-05-25 05:31:15
问题 I have an old factory implementation in c++, and I want to use unique pointers instead of raw pointers in it. A minimal example of my code is as follows. I have a base class A , and a derived class B . In main() , I pass 1 to the create method in A , and the type of b1 is now changed to B . #include <iostream> #include <map> class A { public: A() {} virtual void Foo() {} std::map<int, A *> &registerType() { static std::map<int, A *> map_instance; return map_instance; } A *create(int n) {

Factory pattern using unique_ptr in c++

由 允我心安 提交于 2020-05-25 05:31:10
问题 I have an old factory implementation in c++, and I want to use unique pointers instead of raw pointers in it. A minimal example of my code is as follows. I have a base class A , and a derived class B . In main() , I pass 1 to the create method in A , and the type of b1 is now changed to B . #include <iostream> #include <map> class A { public: A() {} virtual void Foo() {} std::map<int, A *> &registerType() { static std::map<int, A *> map_instance; return map_instance; } A *create(int n) {

What's the difference between the Service Locator and the Factory Design pattern?

由 淺唱寂寞╮ 提交于 2020-05-25 04:11:04
问题 I'm using unity and I'm creating a class that wrapps it and I dont' know how to call it, service locator or factory, both encapsulate the creation of the objects, so.... what's the difference? 回答1: A factory creates objects for you, when requested. Service locator returns objects that may already exist, that is services that may already exist somewhere for you. Just think about the meaning of the names: Factory: is a place where objects are created. Service: is something that can do something

What's the difference between the Service Locator and the Factory Design pattern?

由 岁酱吖の 提交于 2020-05-25 04:09:33
问题 I'm using unity and I'm creating a class that wrapps it and I dont' know how to call it, service locator or factory, both encapsulate the creation of the objects, so.... what's the difference? 回答1: A factory creates objects for you, when requested. Service locator returns objects that may already exist, that is services that may already exist somewhere for you. Just think about the meaning of the names: Factory: is a place where objects are created. Service: is something that can do something

AndroidViewModel with SavedState

由 心不动则不痛 提交于 2020-04-16 02:47:23
问题 I need to use an AndroidViewModel with application context and a SavedStateHandle . I have it already working with application context, but I fail adding a SavedStateHandle to it. This is what I have, with only the application context: // A1. get ViewModel in Fragment val viewModel = ViewModelProvider(viewLifecycleOwner).get(MyViewModel::class.java) // A2. MyViewModel derives from my custom BaseAndroidViewModel class MyViewModel(application: Application) :BaseAndroidViewModel(application) //

ThreadFactory & ThreadGroup

由 本秂侑毒 提交于 2020-03-01 23:56:21
原本想给 多线程任务 做一个挂起（暂停）功能，然后配合 httpcomponents-asyncclient 并发测试，结果意外令人汗颜，竟然CPU占用100%。。。 使用VisualVM观察CPU抽样，发现 org.apache.http.impl.nio.reactor.AbstractIOReactor.execute() 方法总是占用大部分CPU，然而没调用挂起操作时却一切正常。 这挂起操作的其中一环需要中断线程，这些线程均出产自自定义ThreadFactory ： public class GroupThreadFactory implements ThreadFactory { private final ThreadGroup group; private final AtomicInteger threadNumber; public GroupThreadFactory() { this.group = new ThreadGroup("WorkerGroup"); this.threadNumber = new AtomicInteger(1); } public Thread newThread(Runnable r) { Thread t = new Thread(null, r, "pool-thread-" + threadNumber

Loading json data with an AngularJS factory

由 冷暖自知 提交于 2020-02-28 08:23:25
问题 I have a huge json object in my controller that I would like to outsorce to a seperate file. So far I'm doing this: myApp.controller('smController', ['$scope', function($scope) { ... var stadtmobilRates = { classic: { A: { night: 0, hour: 1.4, day: 21, week: 125, km000: 0.2, km101: 0.18, km701: 0.18 }, ... } }; I have used a factory and promises as explained here on Stackoverflow: myApp.factory('stadtMobilRates', function($http) { var promise = null; return function() { if (promise) { // If
订阅 factory