Mermaid图表编辑器

classDiagram
    class Configuration {
        <<interface>>
        +String getValue(String key)
        +void setValue(String key, String value)
        +void refresh()
    }
    class LocalConfiguration {
        -Properties properties
        +getValue(String key) String
        +setValue(String key, String value)
        +loadFromFile(String filePath)
    }
    class RemoteConfiguration {
        -ConfigClient client
        -Map~String, String~ cache
        +getValue(String key) String
        +setValue(String key, String value)
        +refresh()
        +pullFromServer()
    }
    class ConfigClient {
        <<interface>>
        +String fetchConfig(String key)
        +void updateConfig(String key, String value)
        +Map~String, String~ fetchAll()
    }
    class ConsulConfigClient {
        -ConsulClient consulClient
        +fetchConfig(String key) String
        +updateConfig(String key, String value)
        +fetchAll() Map~String, String~
        +watchChanges(ConfigChangeListener listener)
    }
    class NacosConfigClient {
        -NacosConfigService configService
        +fetchConfig(String key) String
        +updateConfig(String key, String value)
        +fetchAll() Map~String, String~
    }
    class ConfigurationManager {
        -Configuration configuration
        -List~ConfigChangeListener~ listeners
        +getInstance() ConfigurationManager
        +getConfig() Configuration
        +setConfig(Configuration config)
        +notifyListeners(ConfigChangeEvent event)
    }
    class ConfigChangeListener {
        <<interface>>
        +onChange(ConfigChangeEvent event)
    }
    Configuration <|.. LocalConfiguration
    Configuration <|.. RemoteConfiguration
    RemoteConfiguration --> ConfigClient
    ConfigClient <|.. ConsulConfigClient
    ConfigClient <|.. NacosConfigClient
    ConfigurationManager --> Configuration
    ConfigurationManager o-- ConfigChangeListener
    ConsulConfigClient --> ConfigChangeListener : notifies