mtsatellite/cmd/mtredisalize/backend.go

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// Copyright 2014, 2015 by Sascha L. Teichmann
2014-08-03 15:59:56 +02:00
// Use of this source code is governed by the MIT license
// that can be found in the LICENSE file.
package main
type (
// Block is the essential transfer unit from to the database.
// Key is the serialized spatial position.
// Data is the serialized from of the corresponding block data.
Block struct {
Key []byte
Data []byte
}
// Session is a database session.
Session interface {
// Del deletes a block by a given key.
Del(hash, key []byte) (bool, error)
// Fetch fetches the block data for a given position.
Fetch(hash, key []byte) ([]byte, error)
// InTransaction returns true if a transaction is running.
InTransaction() bool
// Store stores a block with a given position and data.
Store(hash, key, value []byte) (bool, error)
// AllKeys returns all keys in the database.
AllKeys(hash []byte, done <-chan struct{}) (<-chan []byte, int, error)
// SpatialQuery performs a box query between the positions first and second.
SpatialQuery(hash, first, second []byte, done <-chan struct{}) (<-chan Block, error)
// BeginTransaction starts a transcation.
BeginTransaction() error
// CommitTransaction finishes a transaction.
CommitTransaction() error
// Close closes the database session.
Close() error
}
// Backend is the interface representing a database.
Backend interface {
// NewSession opens a new session.
NewSession() (Session, error)
// Shutdown shuts down the database server.
Shutdown() error
}
)