85 lines
2 KiB
Go
85 lines
2 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 writer
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import (
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"sync"
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"time"
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"github.com/google/cayley/graph"
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"github.com/google/cayley/quad"
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)
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type Single struct {
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nextID 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.QuadWriter, error) {
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rep := &Single{nextID: ts.Horizon(), ts: ts}
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if rep.nextID == -1 {
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rep.nextID = 1
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}
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return rep, nil
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}
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func (s *Single) AcquireNextId() int64 {
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s.mut.Lock()
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defer s.mut.Unlock()
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id := s.nextID
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s.nextID += 1
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return id
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}
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func (s *Single) AddQuad(t *quad.Quad) error {
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trans := make([]*graph.Transaction, 1)
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trans[0] = &graph.Transaction{
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ID: s.AcquireNextId(),
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Quad: t,
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Action: graph.Add,
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Timestamp: time.Now(),
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}
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return s.ts.ApplyTransactions(trans)
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}
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func (s *Single) AddQuadSet(set []*quad.Quad) error {
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trans := make([]*graph.Transaction, len(set))
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for i, t := range set {
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trans[i] = &graph.Transaction{
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ID: s.AcquireNextId(),
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Quad: t,
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Action: graph.Add,
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Timestamp: time.Now(),
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}
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}
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s.ts.ApplyTransactions(trans)
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return nil
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}
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func (s *Single) RemoveQuad(t *graph.Quad) error {
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trans := make([]*graph.Transaction, 1)
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trans[0] = &graph.Transaction{
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ID: s.AcquireNextId(),
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Triple: t,
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Action: graph.Delete,
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Timestamp: time.Now(),
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}
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return s.ts.ApplyTransactions(trans)
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}
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func init() {
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graph.RegisterWriter("single", NewSingleReplication)
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}
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