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vclock.go
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vclock.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 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 vclock
import (
"fmt"
"go.temporal.io/api/serviceerror"
clockspb "go.temporal.io/server/api/clock/v1"
)
func NewVectorClock(
clusterID int64,
shardID int32,
clock int64,
) *clockspb.VectorClock {
return &clockspb.VectorClock{
ClusterId: clusterID,
ShardId: shardID,
Clock: clock,
}
}
func Comparable(
clock1 *clockspb.VectorClock,
clock2 *clockspb.VectorClock,
) bool {
if clock1 == nil || clock2 == nil {
return false
}
return clock1.GetClusterId() == clock2.GetClusterId() &&
clock1.GetShardId() == clock2.GetShardId()
}
func Compare(
clock1 *clockspb.VectorClock,
clock2 *clockspb.VectorClock,
) (int, error) {
if !Comparable(clock1, clock2) {
return 0, serviceerror.NewInternal(fmt.Sprintf(
"Encountered shard ID mismatch: %v:%v vs %v:%v",
clock1.GetClusterId(),
clock1.GetShardId(),
clock2.GetClusterId(),
clock2.GetShardId(),
))
}
vClock1 := clock1.GetClock()
vClock2 := clock2.GetClock()
if vClock1 < vClock2 {
return -1, nil
} else if vClock1 > vClock2 {
return 1, nil
} else {
return 0, nil
}
}