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preview_source_offset_tracker.go
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/
preview_source_offset_tracker.go
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// Copyright 2018 StreamSets Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package preview
import (
"github.com/streamsets/datacollector-edge/container/common"
"github.com/streamsets/datacollector-edge/container/execution"
"time"
)
type PreviewSourceOffsetTracker struct {
pipelineId string
currentOffset common.SourceOffset
newOffset *string
finished bool
lastBatchTime time.Time
}
var emptyOffset = ""
func (o *PreviewSourceOffsetTracker) IsFinished() bool {
return false
}
func (o *PreviewSourceOffsetTracker) SetOffset(newOffset *string) {
o.newOffset = newOffset
}
func (o *PreviewSourceOffsetTracker) CommitOffset() error {
o.currentOffset.Offset[common.PollSourceOffsetKey] = o.newOffset
o.finished = o.currentOffset.Offset[common.PollSourceOffsetKey] == &emptyOffset
o.newOffset = &emptyOffset
return nil
}
func (o *PreviewSourceOffsetTracker) GetOffset() *string {
return o.currentOffset.Offset[common.PollSourceOffsetKey]
}
func (o *PreviewSourceOffsetTracker) GetLastBatchTime() time.Time {
return o.lastBatchTime
}
func NewPreviewSourceOffsetTracker(pipelineId string) execution.SourceOffsetTracker {
return &PreviewSourceOffsetTracker{
pipelineId: pipelineId,
currentOffset: common.GetDefaultOffset(),
}
}