postgres

package
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Published: Apr 13, 2019 License: MIT Imports: 6 Imported by: 0

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Types

type Checkpoint

type Checkpoint struct {
	// contains filtered or unexported fields
}

Checkpoint stores and retrieves the last evaluated key from a DDB scan

func New

func New(appName, tableName, connectionStr string, opts ...Option) (*Checkpoint, error)

New returns a checkpoint that uses PostgresDB for underlying storage Using connectionStr turn it more flexible to use specific db configs

func (*Checkpoint) Get

func (c *Checkpoint) Get(streamName, shardID string) (string, error)

Get determines if a checkpoint for a particular Shard exists. Typically used to determine whether we should start processing the shard with TRIM_HORIZON or AFTER_SEQUENCE_NUMBER (if checkpoint exists).

func (*Checkpoint) GetMaxInterval

func (c *Checkpoint) GetMaxInterval() time.Duration

GetMaxInterval returns the maximum interval before the checkpoint

func (*Checkpoint) Set

func (c *Checkpoint) Set(streamName, shardID, sequenceNumber string) error

Set stores a checkpoint for a shard (e.g. sequence number of last record processed by application). Upon failover, record processing is resumed from this point.

func (*Checkpoint) Shutdown

func (c *Checkpoint) Shutdown() error

Shutdown the checkpoint. Save any in-flight data.

type Option

type Option func(*Checkpoint)

Option is used to override defaults when creating a new Checkpoint

func WithMaxInterval

func WithMaxInterval(maxInterval time.Duration) Option

WithMaxInterval sets the flush interval

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