| /' |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF 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. |
| '/ |
| @startuml |
| [*] --> Active : acquire new |
| Active : state=Active |
| Active : startTime=t |
| Active : leaseEnd=t' > tc |
| Active -right-> Inactive : release |
| Active -down-> Expired : lease\nexpired |
| |
| Inactive : state=null |
| Inactive : startTime=t |
| Inactive : leaseEnd=null |
| Inactive -left-> Active : acquire existing |
| |
| Expired : state=Active |
| Expired : startTime=t |
| Expired : leaseEnd=t' < tc |
| Expired -right-> Recovering : start recovery |
| |
| Recovering : state=Active |
| Recovering : startTime=t |
| Recovering : leaseEnd=t' > tc |
| Recovering : recoveryLock=Acquired |
| Recovering : recoveryBy=id |
| Recovering -up-> Inactive : recovery\nsuccessful |
| Recovering -left-> Expired : recovery failed |
| Recovering -> Recovering : break\nrecovery lock |
| |
| footer tc : current time |
| @enduml |
