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records.go
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records.go
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package health
import (
"container/list"
"sync"
)
type records struct {
capacity int
items *list.List
mutex sync.RWMutex
}
func newRecords(capacity int) *records {
return &records{
capacity: capacity,
items: list.New(),
}
}
func (records *records) addRecord(incomingRecord record) {
records.mutex.Lock()
defer records.mutex.Unlock()
if !records.makeRoomForRecordNoLock(incomingRecord) {
return
}
insertionPlace := records.findInsertionPlaceNoLock(incomingRecord)
if insertionPlace == nil {
records.items.PushBack(incomingRecord)
} else {
records.items.InsertBefore(incomingRecord, insertionPlace)
}
err := incomingRecord.save()
if err != nil {
log.Error("records.addRecord()", "err", err)
}
}
func (records *records) makeRoomForRecordNoLock(incomingRecord record) bool {
capacityReached := records.items.Len() >= records.capacity
if capacityReached {
if records.getLeastImportantNoLock().isMoreImportantThan(incomingRecord) {
return false
}
records.evictLeastImportantNoLock()
}
return true
}
func (records *records) getLeastImportantNoLock() record {
return records.items.Back().Value.(record)
}
func (records *records) evictLeastImportantNoLock() {
leastImportantElement := records.items.Back()
leastImportantRecord := leastImportantElement.Value.(record)
records.items.Remove(leastImportantElement)
err := leastImportantRecord.delete()
if err != nil {
log.Error("records.evictLeastImportantNoLock()", "err", err)
}
}
func (records *records) findInsertionPlaceNoLock(incomingRecord record) *list.Element {
for element := records.items.Front(); element != nil; element = element.Next() {
recordObj := element.Value.(record)
if incomingRecord.isMoreImportantThan(recordObj) {
return element
}
}
return nil
}
func (records *records) len() int {
records.mutex.RLock()
defer records.mutex.RUnlock()
return records.items.Len()
}
func (records *records) getMostImportant() record {
records.mutex.RLock()
defer records.mutex.RUnlock()
return records.items.Front().Value.(record)
}