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setup.go
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setup.go
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package datacontext
import (
"sync"
)
// SetupHandler is a handler, which can be registered by an arbitrary
// context part used to setup this parts for a new context.
// For example, a typical use case is setup a default value
// for a context attribute.
// The handler may consider the context creation mode to determine
// the initial content or structure of the context part.
type SetupHandler interface {
Setup(mode BuilderMode, ctx Context)
}
// SetupHandlerFunction is a function usable as SetupHandler.
type SetupHandlerFunction func(mode BuilderMode, ctx Context)
func (f SetupHandlerFunction) Setup(mode BuilderMode, ctx Context) {
f(mode, ctx)
}
// SetupHandlerRegistry is used to register and execute SetupHandler for
// a freshly created context.
type SetupHandlerRegistry interface {
Register(h SetupHandler)
Setup(mode BuilderMode, ctx Context)
}
type setupRegistry struct {
lock sync.Mutex
handlers []SetupHandler
}
func (s *setupRegistry) Register(h SetupHandler) {
s.lock.Lock()
defer s.lock.Unlock()
s.handlers = append(s.handlers, h)
}
func (s *setupRegistry) Setup(mode BuilderMode, ctx Context) {
s.lock.Lock()
defer s.lock.Unlock()
for _, h := range s.handlers {
h.Setup(mode, ctx)
}
}
var registry SetupHandlerRegistry = &setupRegistry{}
func RegisterSetupHandler(h SetupHandler) {
registry.Register(h)
}
func SetupContext[C Context](mode BuilderMode, ctx C) C {
registry.Setup(mode, ctx)
return ctx
}