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Wenquan Xing
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // Copyright (c) 2018 Uber Technologies, Inc. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
|
|
||
| package cluster | ||
|
|
||
| type ( | ||
| // Metadata provides information about clusters | ||
| Metadata interface { | ||
| GetNextFailoverVersion(int64) int64 | ||
| // GetCurrentClusterName return the current cluster name | ||
| GetCurrentClusterName() string | ||
| // GetAllClusterNames return the all cluster names, as a set | ||
| GetAllClusterNames() map[string]bool | ||
| } | ||
|
|
||
| MetadataImpl struct { | ||
| // initialFailoverVersion is the initial failover version | ||
| initialFailoverVersion int64 | ||
| // failoverVersionIncrement is the increment of each cluster failover version | ||
| failoverVersionIncrement int64 | ||
| // currentClusterName is the name of the current cluster | ||
| currentClusterName string | ||
| // clusterNames contains all cluster names, as a set | ||
| clusterNames map[string]bool | ||
| } | ||
| ) | ||
|
|
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| // NewMetadata create a new instance of Metadata | ||
| func NewMetadata(initialFailoverVersion int64, failoverVersionIncrement int64, | ||
| currentClusterName string, clusterNames []string) Metadata { | ||
|
|
||
| if initialFailoverVersion < 0 { | ||
| panic("Bad initial failover version") | ||
| } else if failoverVersionIncrement <= initialFailoverVersion { | ||
| panic("Bad failover version increment") | ||
| } else if len(currentClusterName) == 0 { | ||
| panic("Current cluster name is empty") | ||
| } else if len(clusterNames) == 0 { | ||
| panic("Total number of all cluster names is 0") | ||
| } | ||
|
|
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| clusters := make(map[string]bool) | ||
| for _, clusterName := range clusterNames { | ||
| if len(clusterName) == 0 { | ||
| panic("Cluster name in all cluster names is empty") | ||
| } | ||
| clusters[clusterName] = true | ||
| } | ||
| if _, ok := clusters[currentClusterName]; !ok { | ||
| panic("Current cluster is not specified in all cluster names") | ||
| } | ||
|
|
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| return &MetadataImpl{ | ||
| initialFailoverVersion: initialFailoverVersion, | ||
| failoverVersionIncrement: failoverVersionIncrement, | ||
| currentClusterName: currentClusterName, | ||
| clusterNames: clusters, | ||
| } | ||
| } | ||
|
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| // GetNextFailoverVersion return the next failover version based on input | ||
| func (metadata *MetadataImpl) GetNextFailoverVersion(currentFailoverVersion int64) int64 { | ||
| failoverVersion := currentFailoverVersion/metadata.failoverVersionIncrement + metadata.initialFailoverVersion | ||
| if failoverVersion < currentFailoverVersion { | ||
| return failoverVersion + metadata.failoverVersionIncrement | ||
| } | ||
| return failoverVersion | ||
| } | ||
|
|
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| // GetCurrentClusterName return the current cluster name | ||
| func (metadata *MetadataImpl) GetCurrentClusterName() string { | ||
| return metadata.currentClusterName | ||
| } | ||
|
|
||
| // GetAllClusterNames return the all cluster names | ||
| func (metadata *MetadataImpl) GetAllClusterNames() map[string]bool { | ||
| return metadata.clusterNames | ||
| } |
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