57 lines
1.5 KiB
Go
57 lines
1.5 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 replication
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import (
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"sync"
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"github.com/google/cayley/graph"
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)
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type Single struct {
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lastID int64
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ts graph.TripleStore
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mut sync.Mutex
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}
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func NewSingleReplication(ts graph.TripleStore, opts graph.Options) (graph.Replication, error) {
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rep := &Single{lastID: ts.Horizon(), ts: ts}
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ts.SetReplication(rep)
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return rep, nil
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}
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func (s *Single) AcquireNextIds(size int64) (start int64, end int64) {
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s.mut.Lock()
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defer s.mut.Unlock()
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start = s.lastID + 1
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end = s.lastID + size
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s.lastID += size
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return
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}
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func (s *Single) GetLastID() int64 {
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return s.lastID
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}
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func (s *Single) Replicate([]*graph.Transaction) {
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// Noop, single-machines don't replicate out anywhere.
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}
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func (s *Single) RequestTransactionRange(int64, int64) {
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// Single machines also can't catch up.
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}
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func init() {
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graph.RegisterReplication("local", NewSingleReplication)
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}
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