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49d0e0fbc8
* Rename dax.Shard to dax.VersionedShard * Rename dax.Partition to dax.VersionedPartition * Rename dax.FieldVersion to dax.VersionedField * Rename go files to a standard
110 lines
4.1 KiB
Go
110 lines
4.1 KiB
Go
package dax
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import (
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"context"
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)
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// VersionStore is an interface for tracking Shard, Partition, and Field[Key]
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// versions. For example, when the contents of a shard are checkpointed, and a
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// snapshot is generated, and the write log messages for that shard are
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// truncated, the ShardVersion for that shard is incremented. The VersionStore
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// is the interface through which various services read/write that version.
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type VersionStore interface {
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AddTable(ctx context.Context, qtid QualifiedTableID) error
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RemoveTable(ctx context.Context, qtid QualifiedTableID) (VersionedShards, VersionedPartitions, error)
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// Shards (shardData)
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AddShards(ctx context.Context, qtid QualifiedTableID, shards ...VersionedShard) error
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Shards(ctx context.Context, qtid QualifiedTableID) (VersionedShards, bool, error)
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ShardVersion(ctx context.Context, qtid QualifiedTableID, shardNum ShardNum) (int, bool, error)
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ShardTables(ctx context.Context, qual TableQualifier) (TableIDs, error)
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// Partitions (tableKeys)
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AddPartitions(ctx context.Context, qtid QualifiedTableID, partitions ...VersionedPartition) error
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Partitions(ctx context.Context, qtid QualifiedTableID) (VersionedPartitions, bool, error)
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PartitionVersion(ctx context.Context, qtid QualifiedTableID, partitionNum PartitionNum) (int, bool, error)
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PartitionTables(ctx context.Context, qual TableQualifier) (TableIDs, error)
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// Fields (fieldKeys)
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AddFields(ctx context.Context, qtid QualifiedTableID, fields ...VersionedField) error
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Fields(ctx context.Context, qtid QualifiedTableID) (VersionedFields, bool, error)
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FieldVersion(ctx context.Context, qtid QualifiedTableID, field FieldName) (int, bool, error)
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FieldTables(ctx context.Context, qual TableQualifier) (TableIDs, error)
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Copy(ctx context.Context) (VersionStore, error)
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}
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type DirectiveVersion interface {
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Increment(ctx context.Context, delta uint64) (uint64, error)
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}
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// Ensure type implements interface.
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var _ VersionStore = (*nopVersionStore)(nil)
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// nopVersionStore is a no-op implementation of the VersionStore interface.
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type nopVersionStore struct{}
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// NewNopVersionStore returns a new no-op instance of VersionStore.
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func NewNopVersionStore() *nopVersionStore {
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return &nopVersionStore{}
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}
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func (s *nopVersionStore) AddTable(ctx context.Context, qtid QualifiedTableID) error {
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return nil
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}
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func (s *nopVersionStore) RemoveTable(ctx context.Context, qtid QualifiedTableID) (VersionedShards, VersionedPartitions, error) {
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return nil, nil, nil
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}
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func (s *nopVersionStore) AddShards(ctx context.Context, qtid QualifiedTableID, shards ...VersionedShard) error {
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return nil
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}
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func (s *nopVersionStore) Shards(ctx context.Context, qtid QualifiedTableID) (VersionedShards, bool, error) {
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return nil, false, nil
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}
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func (s *nopVersionStore) ShardVersion(ctx context.Context, qtid QualifiedTableID, shardNum ShardNum) (int, bool, error) {
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return 0, true, nil
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}
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func (s *nopVersionStore) ShardTables(ctx context.Context, qual TableQualifier) (TableIDs, error) {
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return TableIDs{}, nil
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}
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func (s *nopVersionStore) AddPartitions(ctx context.Context, qtid QualifiedTableID, partitions ...VersionedPartition) error {
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return nil
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}
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func (s *nopVersionStore) Partitions(ctx context.Context, qtid QualifiedTableID) (VersionedPartitions, bool, error) {
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return nil, false, nil
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}
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func (s *nopVersionStore) PartitionVersion(ctx context.Context, qtid QualifiedTableID, partitionNum PartitionNum) (int, bool, error) {
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return 0, true, nil
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}
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func (s *nopVersionStore) PartitionTables(ctx context.Context, qual TableQualifier) (TableIDs, error) {
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return TableIDs{}, nil
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}
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func (s *nopVersionStore) AddFields(ctx context.Context, qtid QualifiedTableID, fields ...VersionedField) error {
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return nil
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}
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func (s *nopVersionStore) Fields(ctx context.Context, qtid QualifiedTableID) (VersionedFields, bool, error) {
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return nil, false, nil
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}
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func (s *nopVersionStore) FieldVersion(ctx context.Context, qtid QualifiedTableID, field FieldName) (int, bool, error) {
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return 0, true, nil
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}
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func (s *nopVersionStore) FieldTables(ctx context.Context, qual TableQualifier) (TableIDs, error) {
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return TableIDs{}, nil
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}
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func (s *nopVersionStore) Copy(ctx context.Context) (VersionStore, error) {
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return nil, nil
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}
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