forked from basho/riak-go-client
/
states.go
executable file
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/
states.go
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package riak
import (
"fmt"
"sync"
)
type state byte
type stateful interface {
fmt.Stringer
setStateDesc(desc ...string)
isCurrentState(st state) (rv bool)
isStateLessThan(st state) (rv bool)
setState(st state)
getState() (st state)
stateCheck(allowed ...state) (err error)
}
type stateData struct {
sync.RWMutex
stateVal state
stateDesc []string
setStateFunc func(sd *stateData, st state)
}
var defaultSetStateFunc = func(sd *stateData, st state) {
sd.stateVal = st
}
func (s *stateData) initStateData(desc ...string) {
s.stateDesc = desc
s.setStateFunc = defaultSetStateFunc
}
func (s *stateData) String() string {
stateIdx := int(s.stateVal)
if len(s.stateDesc) > stateIdx {
return s.stateDesc[stateIdx]
} else {
return fmt.Sprintf("STATE_%v", stateIdx)
}
}
func (s *stateData) isCurrentState(st state) bool {
s.RLock()
defer s.RUnlock()
return s.stateVal == st
}
func (s *stateData) isStateLessThan(st state) bool {
s.RLock()
defer s.RUnlock()
return s.stateVal < st
}
func (s *stateData) getState() state {
s.RLock()
defer s.RUnlock()
return s.stateVal
}
func (s *stateData) setState(st state) {
s.Lock()
defer s.Unlock()
s.setStateFunc(s, st)
}
func (s *stateData) stateCheck(allowed ...state) error {
s.RLock()
defer s.RUnlock()
stateAllowed := false
for _, st := range allowed {
if s.stateVal == st {
stateAllowed = true
break
}
}
if !stateAllowed {
return fmt.Errorf("Illegal State - required %v: current: %v", allowed, s.stateVal)
}
return nil
}