/
jsonHistoryTokenSerializer.go
92 lines (78 loc) · 2.89 KB
/
jsonHistoryTokenSerializer.go
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// Copyright (c) 2017 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 persistence
import "encoding/json"
type (
jsonHistoryTokenSerializer struct{}
// historyV2PagingToken is used to serialize/deserialize pagination token for ReadHistoryBranchRequest
historyV2PagingToken struct {
// TODO remove LastEventVersion once 3+DC is enabled for all workflow
LastEventVersion int64
LastEventID int64
// the pagination token passing to persistence
StoreToken []byte
// recording which branchRange it is reading
CurrentRangeIndex int
FinalRangeIndex int
// LastNodeID is the last known node ID attached to a history node
LastNodeID int64
// LastTransactionID is the last known transaction ID attached to a history node
LastTransactionID int64
}
)
const notStartedIndex = -1
// newJSONHistoryTokenSerializer creates a new instance of TaskTokenSerializer
func newJSONHistoryTokenSerializer() *jsonHistoryTokenSerializer {
return &jsonHistoryTokenSerializer{}
}
func (t *historyV2PagingToken) SetRangeIndexes(
current int,
final int,
) {
t.CurrentRangeIndex = current
t.FinalRangeIndex = final
}
func (j *jsonHistoryTokenSerializer) Serialize(
token *historyV2PagingToken,
) ([]byte, error) {
data, err := json.Marshal(token)
return data, err
}
func (j *jsonHistoryTokenSerializer) Deserialize(
data []byte,
defaultLastEventID int64,
defaultLastEventVersion int64,
defaultLastNodeID int64,
defaultLastTransactionID int64,
) (*historyV2PagingToken, error) {
if len(data) == 0 {
token := historyV2PagingToken{
LastEventID: defaultLastEventID,
LastEventVersion: defaultLastEventVersion,
CurrentRangeIndex: notStartedIndex,
LastNodeID: defaultLastNodeID,
LastTransactionID: defaultLastTransactionID,
}
return &token, nil
}
token := historyV2PagingToken{}
err := json.Unmarshal(data, &token)
return &token, err
}