gcfg组件采用了接口化设计，以实现高扩展性。通过接口化设计的方式，使用者可以自定义对接的配置获取方式，例如etcd, zookeeper, consule, kubernetes configmap, apollo等等。
https://github.com/gogf/gf/v2/blob/master/os/gcfg/gcfg_adaper.go
// Adapter is the interface for configuration retrieving.
type Adapter interface {
// Available checks and returns the configuration service is available.
// The optional parameter `resource` specifies certain configuration resource.
//
// It returns true if configuration file is present in default AdapterFile, or else false.
// Note that this function does not return error as it just does simply check for backend configuration service.
Available(ctx context.Context, resource ...string) (ok bool)
// Get retrieves and returns value by specified `pattern`.
Get(ctx context.Context, pattern string) (value interface{}, err error)
// Data retrieves and returns all configuration data as map type.
// Note that this function may lead lots of memory usage if configuration data is too large,
// you can implement this function if necessary.
Data(ctx context.Context) (data map[string]interface{}, err error)
}
// SetAdapter sets the adapter of current Config object.
func (c *Config) SetAdapter(adapter Adapter)
// GetAdapter returns the adapter of current Config object.
func (c *Config) GetAdapter() Adapter
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