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family_manager.go
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family_manager.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package tsdb
import (
"sync"
)
var (
fManager FamilyManager
once4FamilyManager sync.Once
)
// GetFamilyManager returns the data family manager singleton instance.
// FIXME: need clean readonly family when no read long term
func GetFamilyManager() FamilyManager {
once4FamilyManager.Do(func() {
fManager = newFamilyManager()
})
return fManager
}
// FamilyManager represents the data family manager.
type FamilyManager interface {
// AddFamily adds the family.
AddFamily(family DataFamily)
// RemoveFamily removes the family.
RemoveFamily(family DataFamily)
// WalkEntry walks each family entry via fn.
WalkEntry(fn func(family DataFamily))
// GetFamiliesByShard returns families for spec shard.
GetFamiliesByShard(shard Shard) []DataFamily
}
// familyManager implements FamilyManager interface.
type familyManager struct {
families sync.Map
}
// newFamilyManager creates the family manager.
func newFamilyManager() FamilyManager {
return &familyManager{}
}
// AddFamily adds the family.
func (sm *familyManager) AddFamily(family DataFamily) {
sm.families.Store(family.Indicator(), family)
}
// RemoveFamily removes the family.
func (sm *familyManager) RemoveFamily(family DataFamily) {
sm.families.Delete(family.Indicator())
}
// WalkEntry walks each family entry via fn.
func (sm *familyManager) WalkEntry(fn func(family DataFamily)) {
sm.families.Range(func(_, value interface{}) bool {
family := value.(DataFamily)
fn(family)
return true
})
}
// GetFamiliesByShard returns families for spec shard.
func (sm *familyManager) GetFamiliesByShard(shard Shard) (rs []DataFamily) {
sm.families.Range(func(_, value interface{}) bool {
family := value.(DataFamily)
if family.Shard().Indicator() == shard.Indicator() {
rs = append(rs, family)
}
return true
})
return
}