53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
// Copyright 2014 The Cayley Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package graph
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// Defines the interface for consistent replication of a graph instance.
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//
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// Separate from the backend, this dictates how individual triples get
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// identified and replicated consistently across (potentially) multiple
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// instances. The simplest case is to keep an append-only log of triple
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// changes.
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type Procedure byte
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const (
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Add Procedure = iota
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Delete
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)
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type Transaction struct {
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Id int64
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Triple *Triple
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Action Procedure
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}
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type Replication interface {
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// Get a unique range of triple IDs from the Replication strategy.
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// Returns the inclusive set of unique ids.
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AcquireNextIds(size int64) (start int64, end int64)
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// Returns the highest current ID.
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GetLastId() int64
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// Sends the transactions to the replicas.
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Replicate([]*Transaction)
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// Attempt to acquire the given range of triples from other replicated sources.
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RequestTransactionRange(start int64, end int64)
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// Opens the replication interface.
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Open(TripleStore, Options)
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}
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