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single.go
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single.go
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// Copyright 2014 The Cayley Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package writer
import (
"sync"
"time"
"github.com/google/cayley/graph"
"github.com/google/cayley/quad"
)
func init() {
graph.RegisterWriter("single", NewSingleReplication)
}
type Single struct {
nextID int64
ts graph.TripleStore
mut sync.Mutex
}
func NewSingleReplication(ts graph.TripleStore, opts graph.Options) (graph.QuadWriter, error) {
horizon := ts.Horizon()
rep := &Single{nextID: horizon + 1, ts: ts}
if horizon <= 0 {
rep.nextID = 1
}
return rep, nil
}
func (s *Single) AcquireNextID() int64 {
s.mut.Lock()
defer s.mut.Unlock()
id := s.nextID
s.nextID++
return id
}
func (s *Single) AddQuad(q quad.Quad) error {
deltas := make([]graph.Delta, 1)
deltas[0] = graph.Delta{
ID: s.AcquireNextID(),
Quad: q,
Action: graph.Add,
Timestamp: time.Now(),
}
return s.ts.ApplyDeltas(deltas)
}
func (s *Single) AddQuadSet(set []quad.Quad) error {
deltas := make([]graph.Delta, len(set))
for i, q := range set {
deltas[i] = graph.Delta{
ID: s.AcquireNextID(),
Quad: q,
Action: graph.Add,
Timestamp: time.Now(),
}
}
s.ts.ApplyDeltas(deltas)
return nil
}
func (s *Single) RemoveQuad(q quad.Quad) error {
deltas := make([]graph.Delta, 1)
deltas[0] = graph.Delta{
ID: s.AcquireNextID(),
Quad: q,
Action: graph.Delete,
Timestamp: time.Now(),
}
return s.ts.ApplyDeltas(deltas)
}
func (s *Single) Close() error {
// Nothing to clean up locally.
return nil
}