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143 lines
3.7 KiB
Markdown
143 lines
3.7 KiB
Markdown
# SDI
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[  ](https://bintray.com/insanusmokrassar/InsanusMokrassar/sdi/_latestVersion)
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[](https://maven-badges.herokuapp.com/maven-central/com.github.insanusmokrassar/sdi)
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[](https://travis-ci.com/InsanusMokrassar/SDI)
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It is simple (in comparison with other systems) DI, which aim to be compatible and predictable. This library was created
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with aim on difficult systems with opportunity to reconfigure most parts of behaviours without recompilation of code.
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## Platforms support
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* [x] JVM
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* [ ] JS
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* [ ] Native
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## Required environment
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To use this library you will need two things:
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* Json serializer
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* Json config
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Unfortunately, currently not supported other formats (due to
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[issue in Kotlinx.serialization](https://github.com/Kotlin/kotlinx.serialization/issues/615))
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## How to implement
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Currently you can connect repository JCenter:
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```groovy
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repositories {
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// ...
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jcenter()
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// ...
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}
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```
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and implement it like here:
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```groovy
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dependencies {
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implementation "com.insanusmokrassar:sdi:$sdi_version"
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}
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```
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Last version shown here: [  ](https://bintray.com/insanusmokrassar/InsanusMokrassar/sdi/_latestVersion)
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## Format of config
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Full examples of usage you can find in [tests](src/commonTest/kotlin/com/insanusmokrassar/sdi). In two words, there are
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a few rules for constructing of config:
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* Config root is an Json Object
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* Config root names will be used as dependency names
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* In the config dependency names can be used everywhere
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* In places, where dependency will be injected, must be used `@ContextualSerializer` annotation or `@Serializer(ContextSerializer::class)`
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### Examples
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Lets imagine, that we have several interfaces and classes:
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```kotlin
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package com.example
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// ... //
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interface ControllerAPI {
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fun showUp()
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}
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interface ServiceAPI {
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val names: List<String>
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}
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@Serializable
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class Controller(@ContextualSerialization val service: ServiceAPI) : ControllerAPI {
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override fun showUp() {
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println("Inited with name \"${service.names}\"")
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}
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}
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@Serializable
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class BusinessService(override val names: List<String>) : ServiceAPI
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```
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Here there is common way to create all of this directly:
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```kotlin
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val service = BusinessService(listOf("One", "Two"))
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val controller = Controller(service)
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```
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And with config for this library:
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```json
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{
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"service": [
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"com.example.BusinessService",
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{
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"names": ["One", "Two"]
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}
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],
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"controller": [
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"com.example.Controller",
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{
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"service": "service"
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}
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]
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}
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```
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Kotlin code will be:
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```kotlin
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val module = loadModule(input)
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val businessService = (module["service"] as BusinessService)
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```
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Here `input` is a json of configuration.
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List example you can find in
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[this test](https://git.insanusmokrassar.com/InsanusMokrassar/SDI/src/master/src/commonTest/kotlin/com/insanusmokrassar/sdi/ListTest.kt).
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Besides, usually you can create objects inside of places where expected something like dependency injection directly. In
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this case config will look like:
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```json
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{
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"controller": [
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"com.example.Controller",
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{
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"service": [
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"com.example.BusinessService",
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{
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"names": ["One", "Two"]
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}
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]
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}
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]
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}
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```
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More expanded example you can find in
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[suitable test](https://git.insanusmokrassar.com/InsanusMokrassar/SDI/src/master/src/commonTest/kotlin/com/insanusmokrassar/sdi/SimpleCustomObjectTest.kt#L63).
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