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container.go
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container.go
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package client
import (
"errors"
"sync"
"github.com/plgd-dev/go-coap/v2/message"
)
var (
ErrKeyAlreadyExists = errors.New("key already exists")
ErrKeyNotExists = errors.New("key does not exist")
)
// HandlerContainer for regirstration handlers by key
type HandlerContainer struct {
datas map[interface{}]HandlerFunc
mutex sync.Mutex
}
// NewHandlerContainer factory
func NewHandlerContainer() *HandlerContainer {
return &HandlerContainer{
datas: make(map[interface{}]HandlerFunc),
}
}
// Insert handler for key.
func (s *HandlerContainer) Insert(key interface{}, handler HandlerFunc) error {
if v, ok := key.(message.Token); ok {
key = v.Hash()
}
s.mutex.Lock()
defer s.mutex.Unlock()
if _, keyExist := s.datas[key]; keyExist {
return ErrKeyAlreadyExists
}
s.datas[key] = handler
return nil
}
// Get returns handler for key
func (s *HandlerContainer) Get(key interface{}) (HandlerFunc, error) {
if v, ok := key.(message.Token); ok {
key = v.Hash()
}
s.mutex.Lock()
defer s.mutex.Unlock()
v, keyExists := s.datas[key]
if !keyExists {
return nil, ErrKeyNotExists
}
return v, nil
}
// Pop pops handler for key
func (s *HandlerContainer) Pop(key interface{}) (HandlerFunc, error) {
if v, ok := key.(message.Token); ok {
key = v.Hash()
}
s.mutex.Lock()
defer s.mutex.Unlock()
v, keyExists := s.datas[key]
if !keyExists {
return nil, ErrKeyNotExists
}
delete(s.datas, key)
return v, nil
}