/
engine.go
49 lines (39 loc) · 941 Bytes
/
engine.go
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package keyvaluestore
import (
"io"
)
type ReadOperator func(backend Backend) (interface{}, error)
type WriteOperator func(backend Backend) error
type RepairOperator func(args RepairArgs)
type RollbackOperator func(args RollbackArgs)
type RepairArgs struct {
Value interface{}
Err error
Winners []Backend
Losers []Backend
}
type RollbackArgs struct {
Nodes []Backend
}
type OperationMode int
type VotingMode int
var (
OperationModeConcurrent OperationMode
OperationModeSequential OperationMode = 1
)
var (
VotingModeVoteOnNotFound VotingMode
VotingModeSkipVoteOnNotFound VotingMode = 1
)
type Engine interface {
io.Closer
Read(nodes []Backend, votesRequired int,
operator ReadOperator,
repair RepairOperator,
cmp ValueComparer,
mode VotingMode) (interface{}, error)
Write(nodes []Backend, acknowledgeRequired int,
operator WriteOperator,
rollback RollbackOperator,
mode OperationMode) error
}