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Refactoring of Delta.IDs & horizon functionality with a PrimaryKey type, needed for implementing UUID based primary keys for backends such as the appengine datastore \n Tests: at top level and if available per backend, if not then just visual

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This commit is contained in:
panamafrancis 2014-12-01 23:00:06 +01:00
parent 26ceed35cc
commit abda6cbbb0
11 changed files with 135 additions and 44 deletions
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27
writer/single.go
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@ -15,7 +15,6 @@
package writer
import (
"sync"
"time"
"github.com/google/cayley/graph"
@ -27,32 +26,18 @@ func init() {
}
type Single struct {
nextID int64
qs graph.QuadStore
mut sync.Mutex
currentID graph.PrimaryKey
qs graph.QuadStore
}
func NewSingleReplication(qs graph.QuadStore, opts graph.Options) (graph.QuadWriter, error) {
horizon := qs.Horizon()
rep := &Single{nextID: horizon + 1, qs: qs}
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
return &Single{currentID: qs.Horizon(), qs: qs}, nil
}
func (s *Single) AddQuad(q quad.Quad) error {
deltas := make([]graph.Delta, 1)
deltas[0] = graph.Delta{
ID: s.AcquireNextID(),
ID: s.currentID.Next(),
Quad: q,
Action: graph.Add,
Timestamp: time.Now(),
@ -64,7 +49,7 @@ 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(),
ID: s.currentID.Next(),
Quad: q,
Action: graph.Add,
Timestamp: time.Now(),
@ -77,7 +62,7 @@ func (s *Single) AddQuadSet(set []quad.Quad) error {
func (s *Single) RemoveQuad(q quad.Quad) error {
deltas := make([]graph.Delta, 1)
deltas[0] = graph.Delta{
ID: s.AcquireNextID(),
ID: s.currentID.Next(),
Quad: q,
Action: graph.Delete,
Timestamp: time.Now(),