dime 0.7.0

Dime is Dependency getion for Dart, allows to define modules with signle/creator inejction factories, allows String tagging and simple Scope tree.

Dime is Dart Dependency "injection framework", it is more like factory and static lookup but with nice wrap.

Dime allows to create modules that define injection types and their InjectFactory implementations. It can easily base on interfaces which allows to pick different implementations. Supports for tag tag based same type instances. Support for multiple modules and scopes with Closable interface to cleanup resources.

Get it from pub page: Pub dime page

Note: All examples below are from example file file. Go there for high level view.

Usage

A simple usage example:

import 'package:dime/dime.dart';

void main() {
  /// Service Module does include details how to create the objects.   
  dimeInstall(ServiceModule());
     
  MyTitleService titleService = dimeGet();
  // or 
  var titleService = dimeGet<MyTitleService>();
  print(titleService.text());
  
}

Setup

Add package dependency to pubspec.yaml:

 depedency: 
   ...
   dime: ^0.7.0
   ...

Define module:

Create a module and how it creates its dependencies:

class MyModule  extends BaseAppgetorModule {
    @override
    void updateInjections() {
        /// define injection factories - below for examples      
    }
}

Below are examples that can be used inside updateinjections method.

Singleton per type

get single value by its class type:

  addSingle(MyTitleService());

get singleton value by implementing interface:

  addSingle<TitleService>(MyTitleService());

Singletons per type with tag

get single value by its class type:

  addSingle(MyTitleService(), tag: "home-title");
  addSingle(MyTitleService(), tag: "details-title");

get singleton value by implementing interface:

  addSingle<TitleService>(MyTitleService(), tag: "home-title");

Creator on-demand injection, it uses type of Creator

This is creator - which will create an object at time of injection.

typedef Creator<T> = T Function(String tag);

The Creator provides optional String tag that may be used to create the tagged instance.

addCreator<TextService>((tag) =>
        MyTitleService(title: "Test title: $tag: now: ${DateTime.now()}"));

Async Creator on-demand injection with Future

We can make the Creator function to return Future

addSingleByCreator((tag) async {
      return Future.delayed(Duration(seconds: 2), () {
        return My2TitleService();
      });
    });

With this setup we can use new method to fetch Future of the value:

var value = await dimeGetAsync<My2TitleService>();
// or
My2TitleService service;
/// (some code)
service = await dimeGetAsync();

or old style which was always supported

var value =await  dimeGet<Future<My2TitleService>>();

The dimeGetAsync helps to cast to known type without defining type in < >

Creator on-demand injection with singleton storage - delayed singleton.

Similar to above example with addCreator, however created instance will be cached per tag.

addSingleByCreator((tag)=>MyDescriptionService());

Create your own factory.

You can always create your own factory by extending getFactory<T> and add those to the module.

 addFactory(MyTooltipService, MyCustomFactory());

Note: There are some other Factories already provided to be used - like:

• getTagFactory for create method with a Tag
• TaggedSingletongetFactory - for tagged singletons with Closeable interface
• SinglegetFactory - single get factory with Closable interface

Add modules to the scope (global too)

You can add modules to the main global scope of Dime or into the opened scopes. When a scope closes all modules in that scope will also close (clean up) by calling each of its Closeable factory close() method to cleanup resources.

Add Module to Global Dime scope.

  dimeInstall(ServiceModule());

Dime Scope fetch up the tree examples:

Test class to be referenced by main scope_test.dart tests.

Modules:

Module	Instance
ModuleA	AA()
	AB()
	AC()
ModuleB	BA()
	BB()
	BC()
ModuleC	CA()
	CB()
	CC()
ModuleXX	AA()
	BB()
	CC()

Scope graph:

Root Scope	Modules/Scopes	Modules/Scopes	Modules/Scopes
Dime	- ModuleC
	- ModuleXX (override)
	- scope1	- ModuleA
		- ModuleB
	- scope2	- ModuleA
		- ModuleC
		- scope 21	- ModuleC
		- scope 22	- ModuleA
			- ModuleB

Example injections:

scope2.inject

Dime.inject

scope1.inject

scope1.inject

scope2.inject

scope2.inject

Dime.inject

Dime.inject

Dime.inject

scope21.inject

scope21.inject

scope22.inject

scope22.inject

scope21.inject

Features and bugs

Please file feature requests and bugs at the issue tracker.