Jeremy Tregunna
6fc3be617d
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Adds a complete LSM-based storage engine with these features: - Single-writer based architecture for the storage engine - WAL for durability, and hey it's configurable - MemTable with skip list implementation for fast read/writes - SSTable with block-based structure for on-disk level-based storage - Background compaction with tiered strategy - ACID transactions - Good documentation (I hope)
46 lines
1.3 KiB
Go
46 lines
1.3 KiB
Go
package transaction
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import (
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"github.com/jer/kevo/pkg/common/iterator"
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)
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// TransactionMode defines the transaction access mode (ReadOnly or ReadWrite)
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type TransactionMode int
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const (
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// ReadOnly transactions only read from the database
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ReadOnly TransactionMode = iota
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// ReadWrite transactions can both read and write to the database
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ReadWrite
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)
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// Transaction represents a database transaction that provides ACID guarantees
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// It follows an concurrency model using reader-writer locks
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type Transaction interface {
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// Get retrieves a value for the given key
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Get(key []byte) ([]byte, error)
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// Put adds or updates a key-value pair (only for ReadWrite transactions)
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Put(key, value []byte) error
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// Delete removes a key (only for ReadWrite transactions)
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Delete(key []byte) error
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// NewIterator returns an iterator for all keys in the transaction
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NewIterator() iterator.Iterator
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// NewRangeIterator returns an iterator limited to the given key range
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NewRangeIterator(startKey, endKey []byte) iterator.Iterator
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// Commit makes all changes permanent
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// For ReadOnly transactions, this just releases resources
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Commit() error
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// Rollback discards all transaction changes
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Rollback() error
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// IsReadOnly returns true if this is a read-only transaction
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IsReadOnly() bool
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}
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