Skip to content

README.md

Latest commit

 

History

History
730 lines (632 loc) · 23.5 KB

README.md

File metadata and controls

730 lines (632 loc) · 23.5 KB
FIT 配置架构设计

[TOC]

配置优先级

配置的优先级原则为外部配置的优先级大于内部配置的优先级。即外部配置更优先被使用，只有当外部配置不存在时，才使用内部配置（默认配置）。

@startuml
hide empty members

skinparam backgroundColor #EEEBDC
skinparam roundcorner 20
skinparam sequenceArrowThickness 2
skinparam ClassFontName Consolas

skinparam component {
BackgroundColor<<File>> #BFCAED
BackgroundColor<<Resource>> #BFEDCA
BackgroundColor<<External>> #EDBFCA
}

left to right direction

actor "调用方" as Client

package 外部配置 {
component [启动参数] <<External>> as StartupConfig
component [系统属性] <<External>> as SystemPropertiesConfig
component [配置文件] <<External>> as ApplicationConfigFile
component [环境变量] <<External>> as EnvironmentVariableConfig
}
ApplicationConfigFile -[hidden]> StartupConfig
EnvironmentVariableConfig -[hidden]> SystemPropertiesConfig

package 嵌入资源 {
component [插件配置] <<Resource>> as PluginEmbeddedResource
component [应用配置] <<Resource>> as ApplicationEmbeddedResource
}
StartupConfig -down-> SystemPropertiesConfig
SystemPropertiesConfig -left-> ApplicationConfigFile
ApplicationConfigFile -down-> EnvironmentVariableConfig
EnvironmentVariableConfig -down-> ApplicationEmbeddedResource
ApplicationEmbeddedResource -right-> PluginEmbeddedResource
Client --> StartupConfig
@enduml

命令行参数 > 环境变量 > 插件配置文件 > 框架配置文件 > 插件资源文件 > 框架资源文件。

架构设计

核心类图

@startuml
hide empty members

skinparam backgroundColor #EEEBDC
skinparam roundcorner 20
skinparam sequenceArrowThickness 2
skinparam ClassFontName Consolas

interface Config {
+ {abstract} name() : String
+ {abstract} keys() : Set<String>
+ {abstract} get(String key) : Object
+ {abstract} get(String key, Type type) : Object
+ {abstract} get(String key, Class<T> clazz) : T
+ {abstract} decrypt(ConfigDecryptor decryptor) : void
+ list(String key, Class<T> elementClass) : List<T>
--
Provide a config that is <b>readonly</b>. <color:blue><b>ModifiableConfig</b></color>
should be used when the value of config can be changed.
}
note right of Config::name()
The name of a <color:blue><b>Config</b></color> is non-functional. It
provides an identifier for <b>distinguishing</b> and
<b>marking</b> in terms of debugging and logs.
end note

interface ModifiableConfig {
+ {abstract} set(String key, Object value) : void
+ {abstract} subscribe(<color:blue><u>ModifiableConfigListener</u></color> listener) : void
+ {abstract} unsubscribe(<color:blue><u>ModifiableConfigListener</u></color> listener) : void
--
Provide a config that can be modified. <color:blue><b>Config</b></color> should
be used if it is <b>NOT</b> modifiable.
}
ModifiableConfig --up--|> Config

interface ModifiableConfigListener {
+ onValueChanged(<color:blue><u>ModifiableConfig</u></color> config, String key) : void
--
<color:red><b>Observer Pattern</b></color>
Provide a listener for <color:blue><b>ModifiableConfig</b></color>. The listener will
be notified with the specified key when the value is
changed.
}
ModifiableConfigListener .left.> ModifiableConfig : listen

interface ConfigChain {
+ {abstract} addConfig(<color:blue><u>Config</u></color> config) : void
+ {abstract} insertConfig(int index, <color:blue><u>Config</u></color> config) : void
+ {abstract} addConfigs(<color:blue><u>Config</u></color>... configs) : void
+ {abstract} removeConfig(<color:blue><u>Config</u></color>) : void
+ {abstract} clear() : void
+ {abstract} numberOfConfigs() : int
+ {abstract} configAt(int index) : <color:blue><u>Config</u></color>
+ {abstract} subscribe(<color:blue><u>ConfigChainListener</u></color> listener) : void
+ {abstract} unsubscribe(<color:blue><u>ConfigChainListener</u></color> listener) : void
--
<color:red><b>Composite Pattern</b></color>
Provide a composite for <color:blue><b>Config</b></color> to present
multiple instances as one.
<color:red><b>Chain of Responsibility Pattern</b></color>
When any key is accessed, the retrieval starts
from the head of the chain and ends when the
value is found. The remaining <color:blue><b>Config</b></color>s will not
be accessed. 
}
ConfigChain -right--|> Config
ConfigChain *-down--> Config

interface ConfigChainListener {
+ onConfigAdded(<color:blue><u>ConfigChain</u></color> chain, <color:blue><u>Config</u></color> config) : void
+ onConfigRemoved(<color:blue><u>ConfigChain</u></color> chain, <color:blue><u>Config</u></color> config) : void
+ onConfigChanged(<color:blue><u>ConfigChain</u></color> chain, <color:blue><u>ModifiableConfig</u></color> config, String key) : void
--
<color:red><b>Observer Pattern</b></color>
Provide a listener for <color:blue><b>ConfigChain</b></color>. The listener will be notified when
<color:blue><b>Config</b></color> is added to or removed from the chain, or values in <color:blue><b>Config</b></color> is
changed.
}
ConfigChainListener .right.> ConfigChain : listen

interface ConfigLoadingResult {
+ {abstract} loaded() : boolean
+ {abstract} config() : <color:blue><u>Config</u></color>
+ {static} success(<color:blue><u>Config</u></color> config) : <color:blue><u>ConfigLoadingResult</u></color>
+ {static} failure() : <color:blue><u>ConfigLoadingResult</u></color>
}

interface ConfigLoader {
+ {abstract} extensions() : Set<String>
+ load(Resource resource) : <color:blue><u>ConfigLoadingResult</u></color>
+ {abstract} load(Resource resource, String name) : <color:blue><u>ConfigLoadingResult</u></color>
+ {static} empty() : <color:blue><u>ConfigLoader</u></color>
+ {static} loadConfig(<color:blue><u>ConfigLoader</u></color> loader, Resource resource) : <color:blue><u>Config</u></color>
+ {static} loadConfig(<color:blue><u>ConfigLoader</u></color> loader, Resource resource, String name) : <color:blue><u>Config</u></color>
--
Provide methods to load <color:blue><b>Config</b></color> from resources.
<color:red><b>Extensibility</b></color>: Java <color:blue>ServiceLoader</color> mechanism.
}
ConfigLoader .right.> ConfigLoadingResult : return
ConfigLoader .down.> Config : load

interface ConfigLoaderChain {
+ {abstract} addLoader(<color:blue><u>ConfigLoader</u></color> loader) : void
+ {abstract} removeLoader(<color:blue><u>ConfigLoader</u></color> loader) : void
+ {abstract} numberOfLoaders() : int
+ {abstract} loaderAt(int index) : <color:blue><u>ConfigLoader</u></color>
+ {abstract} subscribe(<color:blue><u>ConfigLoaderChainListener</u></color> listener) : void
+ {abstract} unsubscribe(<color:blue><u>ConfigLoaderChainListener</u></color> listener) : void
+ {static} createDefault() : <color:blue><u>ConfigLoaderChain</u></color>
--
<color:red><b>Composite Pattern</b></color>
Provide a composite for <color:blue><b>ConfigLoader</b></color> to present
multiple instances as one.
<color:red><b>Chain of Responsibility Pattern</b></color>
When any key is accessed, the retrieval starts from
the head of the chain and ends when the value is
found. The remaining <color:blue><b>ConfigLoader</b></color>s will not be
accessed. 
}
ConfigLoaderChain -right-|> ConfigLoader

interface ConfigLoaderChainListener {
+ onConfigLoaderAdded(<color:blue><u>ConfigLoaderChain</u></color> chain, <color:blue><u>ConfigLoader</u></color> loader) : void
+ onConfigLoaderRemoved(<color:blue><u>ConfigLoaderChain</u></color> chain, <color:blue><u>ConfigLoader</u></color> loader) : void
--
<color:red><b>Observer Pattern</b></color>
Provide a listener for <color:blue><b>ConfigLoaderChain</b></color>. The listener will be notified
when <color:blue><b>ConfigLoader</b></color> is added to or removed from the chain.
}
ConfigLoaderChainListener .right.> ConfigLoaderChain : listen

abstract AbstractConfig {
- name : String
--
+ AbstractConfig(String name)
+ name() : String
+ get(String key, Type type) : Object
+ get(String key, Class<T> clazz) : T
+ toString() : String
--
Provide an abstract base
implementation for the <color:blue><b>Config</b></color>.
Support to convert type of values.
}
AbstractConfig ..up..|> Config

AbstractConfig -[hidden]> ModifiableConfig

class DefaultConfigChain {
- configs : List<<color:blue><u>Config</u></color>>
- listeners : List<<color:blue><u>ConfigChainListener</u></color>>
- configListener : ConfigListener
..
- currentConfigs : List<<color:blue><u>Config</u></color>>
- currentListeners : List<<color:blue><u>ConfigChainListener</u></color>>
--
+ DefaultConfigChain(String name)
+ Set<String> keys()
+ Object get(String key)
+ decrypt(ConfigDecryptor decryptor) : void
+ int addConfig(<color:blue><u>Config</u></color> config)
+ void insertConfig(int index, <color:blue><u>Config</u></color> config)
+ void addConfigs(<color:blue><u>Config</u></color>... configs)
+ void removeConfig(<color:blue><u>Config</u></color> config)
+ void clear()
+ int numberOfConfigs()
+ <color:blue><u>Config</u></color> configAt(int index)
+ void subscribe(<color:blue><u>ConfigChainListener</u></color> listener)
+ void unsubscribe(<color:blue><u>ConfigChainListener</u></color> listener)
# void notifyConfigAdded(<color:blue><u>Config</u></color> config)
# void notifyConfigRemoved(<color:blue><u>Config</u></color> config)
# void notifyConfigChanged(<color:blue><u>ModifiableConfig</u></color> config, String key)
}
DefaultConfigChain .up.> ConfigChain
DefaultConfigChain -down-|> AbstractConfig

abstract AbstractModifiableConfig {
- listeners : List<<color:blue><u>ModifiableConfigListener</u></color>>
--
+ AbstractModifiableConfig(String name)
+ subscribe(<color:blue><u>ModifiableConfigListener</u></color> listener) : void
+ unsubscribe(<color:blue><u>ModifiableConfigListener</u></color> listener) : void
+ decrypt(ConfigDecryptor decryptor) : void
# notifyValueChanged(String key) : void
--
Provide a abstract base implementation for the
<color:blue><b>ModifiableConfig</b></color>.
Support to subscribe and unsubscribe listeners.
}
AbstractModifiableConfig -up-|> AbstractConfig
AbstractModifiableConfig .up.|> ModifiableConfig

class MapConfig {
- map : Map<String, Object>
--
+ MapConfig(String name, Map<String, ?> map)
+ keys() : Set<String>
+ get(String key) : Object
+ set(String key, Object value) : void
--
Provide an implementation of
<color:blue><b>ModifiableConfig</b></color> which values is stored in
a map.
}
MapConfig -up-|> AbstractModifiableConfig

class HierarchicalConfig {
- values : Map<String, Object>
--
+ HierarchicalConfig(String name)
+ HierarchicalConfig(String name, Map<?, ?> values)
+ keys() : Set<String>
+ get(String key) : Object
+ set(String key, Object value) : void
--
Provide an implementation of <color:blue><b>ModifiableConfig</b></color>
which values is stored in a hierarchical map. The
key will be separated into a path by the <b>separator</b>.
The value to set or get will be retrieved
recursively in the hierarchical map.
}
HierarchicalConfig -up-|> AbstractModifiableConfig

class PropertiesConfig {
- properties : Properties
--
+ PropertiesConfig(String name, Properties properties)
+ keys() : Set<String>
+ get(String key) : Object
+ set(String key, Object value) : void
--
Provide an implementation of <color:blue><b>ModifiableConfig</b></color> which
values is stored in a property set.
}
PropertiesConfig -up-|> AbstractModifiableConfig

class ReadonlyPropertiesConfig {
- properties : Properties
--
+ ReadonlyPropertiesConfig(String name, Properties properties)
+ keys() : Set<String>
+ get(String key) : Object
+ decrypt(ConfigDecryptor decryptor) : void
--
Provide an implementation of <color:blue><b>Config</b></color> which values is stored in
a property set.
}
ReadonlyPropertiesConfig -up-|> AbstractConfig

class ReadonlyMapConfig {
- map : Map<String, Object>
--
+ ReadonlyMapConfig(Map<String, Object> map)
+ ReadonlyMapConfig(String name, Map<String, ?> map)
+ keys() : Set<String>
+ get(String key) : Object
+ decrypt(ConfigDecryptor decryptor) : void
--
Provide an implementation of <color:blue><b>Config</b></color> which values is
stored in a map.
}
ReadonlyMapConfig -up-|> AbstractConfig
@enduml

配置的值

值的类型

  • 标量（scalar），表示一个具体的值，如一个整数、字符串等。
    • 整数：java.math.BigInteger
    • 实数：java.math.BigDecimal
    • 布尔值：java.lang.Boolean
    • 字符串：java.lang.String
    • 日期时间：java.util.Date
  • 列表（java.util.List<Object>），表示一系列有序的值，如列表或数组等。
  • 对象（java.util.Map<String, Object>），表示key=value风格的属性与值的集合。

当通过Config接口的get(String)方法获取的配置中指定键的值时，仅会返回null或以上类型的实例。

类型转换

@startuml
hide empty members

skinparam backgroundColor #EEEBDC
skinparam roundcorner 20
skinparam sequenceArrowThickness 2
skinparam ClassFontName Consolas

interface ConversionService {
+ {abstract} discover(Class) : void
+ {abstract} register(ScalarConverter) : void
+ {abstract} register(Iterable<ScalarConverter>) : void
+ convert(Object, Class) : Object
+ {abstract} convert(Object, Type) : Object
+ {static} instance() : ConversionService
}

interface ScalarConverter {
+ {abstract} source() : Class
+ {abstract} target() : Class
+ {abstract} convert(Object) : Object
+ {static} of(Method) : ScalarConverter
}
ConversionService o-> ScalarConverter : use

class MethodScalarConverter {
- source : Class
- target : Class
- method : Method
+ MethodScalarConverter(Method)
+ source() : Class
+ target() : Class
+ convert(Object) : Object
}
MethodScalarConverter .up.|> ScalarConverter

class BuiltinScalarConverters {
+ {static} toByte(Number) : Byte
+ {static} toByte(String) : Byte
+ {static} toShort(Number) : Short
+ {static} toShort(String) : Short
+ {static} toInteger(Number) : Integer
+ {static} toInteger(String) : Integer
+ {static} toLong(Number) : Long
+ {static} toLong(String) : Long
+ {static} toFloat(Number) : Float
+ {static} toFloat(String) : Float
+ {static} toDouble(Number) : Double
+ {static} toDouble(String) : Double
+ {static} toBoolean(BigInteger) : Boolean
+ {static} toBoolean(BigDecimal) : Boolean
+ {static} toBoolean(String) : Boolean
+ {static} toCharacter(Number) : Character
+ {static} toCharacter(String) : Character
+ {static} toString(Object) : String
+ {static} toBigInteger(Number) : BigInteger
+ {static} toBigInteger(String) : BigInteger
+ {static} toBigDecimal(Number) : BigDecimal
+ {static} toBigDecimal(String) : BigDecimal
+ {static} toDate(String) : Date
--
Defines the methods that used to convert
scalar values.
Each method declares a <color:blue><b>ScalarConverter</b></color>
to convert <i><u>parameter type</u></i> to <i><u>return type</u></i>.
}
BuiltinScalarConverters .left.> MethodScalarConverter : implements
@enduml

Support

byte short int long float double boolean char String BigInteger BigDecimal Date
BigInteger Y Y Y Y Y Y Y Y Y Y Y Y
BigDecimal Y Y Y Y Y Y Y Y Y Y Y Y
Boolean N N N N N N Y N Y N N N
String Y Y Y Y Y Y Y Y Y Y Y Y
Date N N N N N N N N Y N N Y

值的合并

标量 列表 对象
标量 列表，包含两个标量 列表，包含标量及列表中的所有值 不支持
列表 列表，包含标量及列表中的所有值 列表，包含两个列表中的所有值 不支持
对象 不支持 不支持 对象，包含两个对象中的所有属性

为什么不能将对象与标量的处理方式保持一致？

配置的形态是层次化的，即是一个树形结构，这个树形结构既是通过对象类型的值构建而成。例如，当配置中包含以下内容时：

  • server.name=demo
  • server.type=http
  • server.port=8088

此时配置的实际结构如下所示（yaml格式）：

server:
  name: demo
  type: http
  port: 8088

此时若将对象与标量合并形成一个列表，会影响配置的实际结构，因此不能将二者合并。

使用方

@startuml
hide empty members

skinparam backgroundColor #EEEBDC
skinparam roundcorner 20
skinparam sequenceArrowThickness 2
skinparam ClassFontName Consolas

left to right direction

component Config

component FitRuntime
component Plugin
component BeanContainer
component BeanMetadata

FitRuntime *-> Plugin
Plugin *-> BeanContainer
BeanContainer *-> BeanMetadata

FitRuntime *-down-> Config
note on link
<color:red><b>Global Config</b></color>
# Command line arguments.
# System properties: <i><color:blue>System</color>.getProperties()</i>
# External config file specified in #1 or #2. (--config-file=xxx)
# Environment variables: <i><color:blue>System</color>.getenv()</i>
end note
Plugin *-down-> Config
note on link
<color:red><b>Plugin Config</b></color>
# Configs from <color:red><b>Global Config</b></color> with <b>prefix</b> of plugin name.
# Embedded resource. Such as <i>fit.yaml</i> e.g.
end note
BeanMetadata *-down-> Config
note on link
<color:red><b>Bean Config</b></color>
# Set manually: <i><color:blue>BeanDefinition</color>.config().set(xxx, xxx)</i>
# Inherited from <color:red><b>Plugin Config</b></color>
end note
@enduml

配置的分层：

  • Global Config
  • Plugin Config
  • Bean Config

Global Config

@startuml
hide empty members

skinparam backgroundColor #EEEBDC
skinparam roundcorner 20
skinparam sequenceArrowThickness 2
skinparam ClassFontName Consolas

skinparam component {
BackgroundColor<<Chain>> #7FBDC0
BackgroundColor<<Node>> #B7D679
}

component "External Config Chain" <<Chain>> as ExternalConfigs
component "CLI Arguments Config" <<Node>> as CliArgsConfig
component "System Properties Config" <<Node>> as SysPropsConfig
component "External Config File" <<Node>> as ExternalFileConfig
component "Environment Variables" <<Node>> as EnvVarsConfig

ExternalConfigs -right-> CliArgsConfig
CliArgsConfig -right-> SysPropsConfig
SysPropsConfig -right-> ExternalFileConfig
ExternalFileConfig -> EnvVarsConfig

component "Builtin Config Chain" <<Chain>> as BuiltinConfigs
component "Profile Builtin Config" <<Node>> as ProfileBuiltinConfig
component "Default Builtin Config" <<Node>> as DefaultBuiltinConfig

BuiltinConfigs -right-> ProfileBuiltinConfig
ProfileBuiltinConfig -right-> DefaultBuiltinConfig

component "Imported Config Chain" <<Chain>> as ImportedConfigs

ExternalConfigs -down-> BuiltinConfigs
BuiltinConfigs -down-> ImportedConfigs
@enduml
  • Command Line Arguments Config，从命令行中解析key=value风格的输入。其中key可以添加--前缀，其与无前缀时的含义是一样的。即--config-file=xxx与config-file=xxx的含义是一样的。
  • System Properties Config，直接通过System.getProperties()所获取的系统属性生成配置。
  • External Config File，从指定的配置文件中解析配置。配置文件的路径通过config-file指定。
  • Environment Variables，直接通过System.getenv()所获取的环境变量生成配置。

Plugin Config

@startuml
hide empty members

skinparam backgroundColor #EEEBDC
skinparam roundcorner 20
skinparam sequenceArrowThickness 2
skinparam ClassFontName Consolas

skinparam component {
BackgroundColor<<Chain>> #7FBDC0
BackgroundColor<<Node>> #B7D679
BackgroundColor<<Decorator>> #779629
BackgroundColor<<Reference>> #D776B9
}

component "Inherited Config Chain" <<Chain>> as InheritedConfigs
component "Global Config (Prefixed)" <<Decorator>> as GlobalConfigWithPrefix
component "Global Config" <<Reference>> as GlobalConfig

InheritedConfigs -right-> GlobalConfigWithPrefix
GlobalConfigWithPrefix -right-> GlobalConfig

component "Imported Config Chain" <<Chain>> as ImportedConfigs

component "Builtin Config Chain" <<Chain>> as BuiltinConfigs
component "Profile Builtin Config" <<Node>> as ProfileBuiltinConfig
component "Default Builtin Config" <<Node>> as DefaultBuiltinConfig

BuiltinConfigs -right-> ProfileBuiltinConfig
ProfileBuiltinConfig -right-> DefaultBuiltinConfig

InheritedConfigs -down-> ImportedConfigs
ImportedConfigs -down->BuiltinConfigs
@enduml
@startuml
hide empty members

skinparam backgroundColor #EEEBDC
skinparam roundcorner 20
skinparam sequenceArrowThickness 2
skinparam ClassFontName Consolas

left to right direction

skinparam component {
  BackgroundColor<<Input>> Pink
  BackgroundColor<<Client>> #7FBDC0
  BackgroundColor<<Class>> #B7D679
  BackgroundColor<<Virtual>> white
}

skinparam package {
  BackgroundColor<<Composite>> lightgray
}

component FitRuntime as FR <<Client>>

package "Global Config" as GC <<Composite>> {
component "Command Line" as CLI <<Input>>
component PropertiesConfig as CLIPC <<Class>>
FR -down-> CLI
CLI -down-> CLIPC

component "System Properties" as SP <<Input>>
component MapConfig as SPMC <<Class>>
FR -down-> SP
SP -down-> SPMC
SP -[hidden]> CLI

component "External File" as EF <<Input>>
component HierarchicalMapConfig as EFHMC <<Class>>
FR -down-> EF
EF -down-> EFHMC
EF -[hidden]> SP

component "Environment Variables" as EV <<Input>>
component MapConfig as EVMC <<Class>>
FR -down-> EV
EV -down-> EVMC
EV -[hidden]> EF

component "Embedded Resource" as ER <<Input>>
component HierarchicalMapConfig as ERHMC <<Class>>
FR -down-> ER
ER -[hidden]> EV
component "Builtin Resource (Default)" as BER <<Input>>
component "Builtin Resource (Profile)" as PAER <<Input>>
component "Annotated Import Resource" as AIER <<Input>>
BER -[hidden]> PAER
AIER -[hidden]> BER
ER -down-> BER
ER -down-> PAER
ER -down-> AIER
BER -down-> ERHMC
PAER -down-> ERHMC
AIER -down-> ERHMC
}

component Plugin as P <<Client>>
FR -right-> P

component "Visit with prefix\n(<i>Key of plugin</i>)" as PVC <<Virtual>> #line.dashed

component "Embedded Resource" as PER <<Input>>
component HierarchicalMapConfig as PERHMC <<Class>>
P -down-> PER
PER -down-> PERHMC

component BeanMetadata as BM <<Client>>
P -right-> BM

component "Custom Properties" as BMCP <<Input>>
component MapConfig as BMCPMC <<Class>>
BM -down-> BMCP
BMCP -down-> BMCPMC

PVC .left.> GC
PER .left.> PVC : inherit
BMCP .left.> PER : inherit
@enduml
@startuml
hide empty members

skinparam backgroundColor #EEEBDC
skinparam roundcorner 20
skinparam sequenceArrowThickness 2
skinparam ClassFontName Consolas
interface BeanContainer {
+ {abstract} plugin() : <color:blue><u>Plugin</u></color>
+ {abstract} factories() : List<<color:blue><u>BeanFactory</u></color>>
}
interface BeanFactory {
+ {abstract} container() : <color:blue><u>BeanContainer</u></color>
+ {abstract} metadata() : <color:blue><u>BeanMetadata</u></color>
}

package "Main elements that contains config" {

interface FitRuntime {
+ {abstract} plugins() : List<<color:blue><u>Plugin</u></color>>
+ {abstract} <color:red><b>config()</b></color> : <color:blue><u>Config</u></color>
}
interface Plugin {
+ {abstract} runtime() : <color:blue><u>FitRuntime</u></color>
+ {abstract} container() : <color:blue><u>BeanContainer</u></color>
+ {abstract} <color:red><b>config()</b></color> : <color:blue><u>Config</u></color>
}
interface BeanMetadata {
+ {abstract} <color:red><b>config()</b></color> : <color:blue><u>Config</u></color>
}
FitRuntime -[hidden]-> BeanMetadata
Plugin -[hidden]-> BeanMetadata
}

FitRuntime "1" *-right-> "n" Plugin
Plugin "1" *-right-> "1" BeanContainer
BeanContainer "1" *-down-> "n" BeanFactory
BeanFactory "1" *-left-> "1" BeanMetadata
@enduml