47daa9d5f0
All source should be prepared in a manner that reflects comments that VMware would be comfortable sharing with the public. Documentation only. No functional change. Update the license to MIT to be consistent with approved OSSTP product tracking ticket: https://osstp.vmware.com/oss/#/upstreamcontrib/project/1101391 Jira CNA-1117 Change-Id: I3fe31f10db954887481e3b21ccd20ec8e39c5996
81 lines
3 KiB
Go
81 lines
3 KiB
Go
/*
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* Copyright (c) 2018 VMware, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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* associated documentation files (the "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package worker
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import (
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"github.com/aws/aws-sdk-go/aws"
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kcl "vmware.com/cascade-kinesis-client/clientlibrary/interfaces"
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)
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type (
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/* Objects of this class are prepared to checkpoint at a specific sequence number. They use an
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* IRecordProcessorCheckpointer to do the actual checkpointing, so their checkpoint is subject to the same 'didn't go
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* backwards' validation as a normal checkpoint.
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*/
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PreparedCheckpointer struct {
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pendingCheckpointSequenceNumber *kcl.ExtendedSequenceNumber
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checkpointer kcl.IRecordProcessorCheckpointer
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}
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/**
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* This class is used to enable RecordProcessors to checkpoint their progress.
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* The Amazon Kinesis Client Library will instantiate an object and provide a reference to the application
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* RecordProcessor instance. Amazon Kinesis Client Library will create one instance per shard assignment.
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*/
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RecordProcessorCheckpointer struct {
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shard *shardStatus
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checkpoint Checkpointer
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}
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)
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func NewRecordProcessorCheckpoint(shard *shardStatus, checkpoint Checkpointer) kcl.IRecordProcessorCheckpointer {
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return &RecordProcessorCheckpointer{
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shard: shard,
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checkpoint: checkpoint,
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}
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}
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func (pc *PreparedCheckpointer) GetPendingCheckpoint() *kcl.ExtendedSequenceNumber {
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return pc.pendingCheckpointSequenceNumber
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}
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func (pc *PreparedCheckpointer) Checkpoint() error {
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return pc.checkpointer.Checkpoint(pc.pendingCheckpointSequenceNumber.SequenceNumber)
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}
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func (rc *RecordProcessorCheckpointer) Checkpoint(sequenceNumber *string) error {
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rc.shard.mux.Lock()
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// checkpoint the last sequence of a closed shard
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if sequenceNumber == nil {
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rc.shard.Checkpoint = SHARD_END
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} else {
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rc.shard.Checkpoint = aws.StringValue(sequenceNumber)
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}
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rc.shard.mux.Unlock()
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return rc.checkpoint.CheckpointSequence(rc.shard)
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}
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func (rc *RecordProcessorCheckpointer) PrepareCheckpoint(sequenceNumber *string) (kcl.IPreparedCheckpointer, error) {
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return &PreparedCheckpointer{}, nil
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}
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