engine

package
Version: v0.0.0-...-7f9930a Latest Latest
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Published: Sep 6, 2015 License: Apache-2.0 Imports: 0 Imported by: 0

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Constants

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Variables

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Functions

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Types

type Batch

type Batch interface {
	// Put appends 'put operation' of the key/value to the batch
	Put(key []byte, value []byte)
	// Delete appends 'delete operation' of the key/value to the batch
	Delete(key []byte)
}

Batch is the interface for local storage

type DB

type DB interface {
	// Get the associated value with key
	// return nil, nil if no value found
	Get(key []byte) ([]byte, error)
	// Getsnapshot generates a snapshot for current DB
	GetSnapshot() (Snapshot, error)
	// NewBatch creates a Batch for writing
	NewBatch() Batch
	// Commit writes the changed data in Batch
	Commit(b Batch) error
	// Close closes database
	Close() error
}

DB is the interface for local storage

type Driver

type Driver interface {
	// Open opens or creates a local storage DB.
	// The schema is a string for a local storage DB specific format.
	Open(schema string) (DB, error)
}

Driver is the interface that must be implemented by a local storage db engine.

type Iterator

type Iterator interface {
	// Next moves the iterator to the next key/value pair,
	// returns true/false if the iterator is exhausted
	Next() bool
	// Key returns the current key of the key/value pair or nil
	// if the iterator is done.
	Key() []byte
	// Values returns the current value of the key/value pair or nil
	// if the iterator is done.
	Value() []byte
	// Release releases current iterator.
	Release()
}

Iterator is the interface for local storage

type Snapshot

type Snapshot interface {
	// Get the associated value with key in this snapshot
	// return nil, nil if no value found
	Get(key []byte) ([]byte, error)
	// NewIterator creates an iterator, seeks the iterator to
	// the first key >= startKey.
	NewIterator(startKey []byte) Iterator
	// Release releases the snapshot
	Release()
}

Snapshot is the interface for local storage

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