| // Copyright (C) MongoDB, Inc. 2017-present. |
| // |
| // 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 |
| |
| package session |
| |
| import ( |
| "sync" |
| |
| "github.com/mongodb/mongo-go-driver/bson" |
| ) |
| |
| // ClusterClock represents a logical clock for keeping track of cluster time. |
| type ClusterClock struct { |
| clusterTime bson.Raw |
| lock sync.Mutex |
| } |
| |
| // GetClusterTime returns the cluster's current time. |
| func (cc *ClusterClock) GetClusterTime() bson.Raw { |
| var ct bson.Raw |
| cc.lock.Lock() |
| ct = cc.clusterTime |
| cc.lock.Unlock() |
| |
| return ct |
| } |
| |
| // AdvanceClusterTime updates the cluster's current time. |
| func (cc *ClusterClock) AdvanceClusterTime(clusterTime bson.Raw) { |
| cc.lock.Lock() |
| cc.clusterTime = MaxClusterTime(cc.clusterTime, clusterTime) |
| cc.lock.Unlock() |
| } |