// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package vsync

// Sync defines methods for data exchange between Syncbases.
// TODO(hpucha): Flesh this out further.
type Sync interface {
	// GetDeltas returns the responder's current generation vector
	// and all the missing log records when compared to the
	// initiator's generation vector.
	GetDeltas() error

	// SyncGroup-related methods.
	// TODO(hpucha): Think of better names for these methods.

	// CreateSyncGroup is typically invoked on a "central" peer to
	// request the creation of a SyncGroup.
	CreateSyncGroup() error

	// JoinSyncGroup is invoked on a SyncGroup Admin and checks if
	// the requestor can join the SyncGroup.
	JoinSyncGroup() error

	// BlobSync methods.
	// FetchBlob returns the requested blob.
	FetchBlob() error
}