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groups.go
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groups.go
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// Copyright 2022 Antrea Authors
//
// Licensed 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 openflow
import (
"sync"
binding "antrea.io/antrea/pkg/ovs/openflow"
)
type GroupAllocator interface {
Allocate() binding.GroupIDType
Release(id binding.GroupIDType)
}
type groupAllocator struct {
// mu is a lock for the groupAllocator.
mu sync.Mutex
groupIDCounter binding.GroupIDType
recycled []binding.GroupIDType
}
// Allocate allocates a new group ID. It allocates id from the "recycled" slices first, then increases the groupIDCounter if no
// recycled ids exist.
func (a *groupAllocator) Allocate() binding.GroupIDType {
a.mu.Lock()
defer a.mu.Unlock()
var id binding.GroupIDType
if len(a.recycled) != 0 {
id = a.recycled[len(a.recycled)-1]
a.recycled = a.recycled[:len(a.recycled)-1]
} else {
a.groupIDCounter += 1
id = a.groupIDCounter
}
return id
}
func (a *groupAllocator) Release(id binding.GroupIDType) {
a.mu.Lock()
defer a.mu.Unlock()
a.recycled = append(a.recycled, id)
}
func NewGroupAllocator(isIPv6 bool) GroupAllocator {
var groupIDCounter binding.GroupIDType
if isIPv6 {
groupIDCounter = 0x10000000
}
return &groupAllocator{groupIDCounter: groupIDCounter}
}