| /* |
| Copyright 2014 The Kubernetes 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 uuid |
| |
| import ( |
| "sync" |
| |
| "github.com/pborman/uuid" |
| |
| "k8s.io/apimachinery/pkg/types" |
| ) |
| |
| var uuidLock sync.Mutex |
| var lastUUID uuid.UUID |
| |
| func NewUUID() types.UID { |
| uuidLock.Lock() |
| defer uuidLock.Unlock() |
| result := uuid.NewUUID() |
| // The UUID package is naive and can generate identical UUIDs if the |
| // time interval is quick enough. |
| // The UUID uses 100 ns increments so it's short enough to actively |
| // wait for a new value. |
| for uuid.Equal(lastUUID, result) == true { |
| result = uuid.NewUUID() |
| } |
| lastUUID = result |
| return types.UID(result.String()) |
| } |