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package logr
import (
"fmt"
"sync"
)
// LevelStatus represents whether a level is enabled and
// requires a stack trace.
type LevelStatus struct {
Enabled bool
Stacktrace bool
empty bool
}
type levelCache interface {
setup()
get(id LevelID) (LevelStatus, bool)
put(id LevelID, status LevelStatus) error
clear()
}
// syncMapLevelCache uses sync.Map which may better handle large concurrency
// scenarios.
type syncMapLevelCache struct {
m sync.Map
}
func (c *syncMapLevelCache) setup() {
c.clear()
}
func (c *syncMapLevelCache) get(id LevelID) (LevelStatus, bool) {
if id > MaxLevelID {
return LevelStatus{}, false
}
s, _ := c.m.Load(id)
status := s.(LevelStatus)
return status, !status.empty
}
func (c *syncMapLevelCache) put(id LevelID, status LevelStatus) error {
if id > MaxLevelID {
return fmt.Errorf("level id cannot exceed MaxLevelID (%d)", MaxLevelID)
}
c.m.Store(id, status)
return nil
}
func (c *syncMapLevelCache) clear() {
var i LevelID
for i = 0; i < MaxLevelID; i++ {
c.m.Store(i, LevelStatus{empty: true})
}
}
// arrayLevelCache using array and a mutex.
type arrayLevelCache struct {
arr [MaxLevelID + 1]LevelStatus
mux sync.RWMutex
}
func (c *arrayLevelCache) setup() {
c.clear()
}
//var dummy = LevelStatus{}
func (c *arrayLevelCache) get(id LevelID) (LevelStatus, bool) {
if id > MaxLevelID {
return LevelStatus{}, false
}
c.mux.RLock()
status := c.arr[id]
ok := !status.empty
c.mux.RUnlock()
return status, ok
}
func (c *arrayLevelCache) put(id LevelID, status LevelStatus) error {
if id > MaxLevelID {
return fmt.Errorf("level id cannot exceed MaxLevelID (%d)", MaxLevelID)
}
c.mux.Lock()
defer c.mux.Unlock()
c.arr[id] = status
return nil
}
func (c *arrayLevelCache) clear() {
c.mux.Lock()
defer c.mux.Unlock()
for i := range c.arr {
c.arr[i] = LevelStatus{empty: true}
}
}
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