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version_gen.go
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version_gen.go
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package core
import (
"strconv"
"time"
"github.com/rerorero/meshem/src/model"
)
type VersionGenerator interface {
New() model.Version
Compare(l, r model.Version) int
}
type currentTimeGen struct{}
func NewCurrentTimeGenerator() VersionGenerator {
return ¤tTimeGen{}
}
// TODO: generate a distributed sequential unique number (in datastore?)
func (gen *currentTimeGen) New() model.Version {
now := time.Now().UnixNano() / int64(time.Millisecond)
return model.Version(strconv.FormatInt(now, 10))
}
// Compare returns 0 if l==r, -1 if l>r, +1 if l<r
func (gen *currentTimeGen) Compare(l, r model.Version) int {
if l == r {
return 0
}
ln, err := strconv.ParseInt(string(l), 10, 64)
if err != nil {
return 0
}
rn, err := strconv.ParseInt(string(r), 10, 64)
if err != nil {
return 0
}
if ln > rn {
return -1
} else if ln < rn {
return 1
}
return 0
}
// MockedVersionGen is mock generator for testing
type MockedVersionGen struct {
Version model.Version
CompareResult int
}
func (gen *MockedVersionGen) New() model.Version {
return gen.Version
}
func (gen *MockedVersionGen) Compare(l, r model.Version) int {
return gen.CompareResult
}