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added sync pools for hashing

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This commit is contained in:
panamafrancis 2015-02-26 01:52:09 +01:00
parent 9281fc2971
commit 643e721f82
3 changed files with 33 additions and 32 deletions
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53
graph/gaedatastore/quadstore.go
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@ -23,6 +23,7 @@ import (
"hash"
"math"
"net/http"
"sync"
"appengine"
"appengine/datastore"
@ -41,13 +42,15 @@ const (
var (
// Order of quad fields
spo = [4]quad.Direction{quad.Subject, quad.Predicate, quad.Object, quad.Label}
spo = [4]quad.Direction{quad.Subject, quad.Predicate, quad.Object, quad.Label}
hashPool = sync.Pool{
New: func() interface{} { return sha1.New() },
}
hashSize = sha1.Size
)
type QuadStore struct {
hashSize int
makeHasher func() hash.Hash
context appengine.Context
context appengine.Context
}
type MetadataEntry struct {
@ -87,14 +90,12 @@ func init() {
}
func initQuadStore(_ string, _ graph.Options) error {
// TODO (stefankoshiw) check appengine datastore for consistency
// TODO (panamafrancis) check appengine datastore for consistency
return nil
}
func newQuadStore(_ string, options graph.Options) (graph.QuadStore, error) {
var qs QuadStore
qs.hashSize = sha1.Size
qs.makeHasher = sha1.New
return &qs, nil
}
@ -109,17 +110,15 @@ func newQuadStoreForRequest(qs graph.QuadStore, options graph.Options) (graph.Qu
}
func (qs *QuadStore) createKeyForQuad(q quad.Quad) *datastore.Key {
hasher := qs.makeHasher()
id := qs.hashOf(q.Subject, hasher)
id += qs.hashOf(q.Predicate, hasher)
id += qs.hashOf(q.Object, hasher)
id += qs.hashOf(q.Label, hasher)
id := hashOf(q.Subject)
id += hashOf(q.Predicate)
id += hashOf(q.Object)
id += hashOf(q.Label)
return qs.createKeyFromToken(&Token{quadKind, id})
}
func (qs *QuadStore) createKeyForNode(n string) *datastore.Key {
hasher := qs.makeHasher()
id := qs.hashOf(n, hasher)
id := hashOf(n)
return qs.createKeyFromToken(&Token{nodeKind, id})
}
@ -401,8 +400,7 @@ func (qs *QuadStore) QuadsAllIterator() graph.Iterator {
}
func (qs *QuadStore) ValueOf(s string) graph.Value {
hasher := qs.makeHasher()
id := qs.hashOf(s, hasher)
id := hashOf(s)
return &Token{Kind: nodeKind, Hash: id}
}
@ -419,7 +417,7 @@ func (qs *QuadStore) NameOf(val graph.Value) string {
return ""
}
// TODO (stefankoshiw) implement a cache
// TODO (panamafrancis) implement a cache
node := new(NodeEntry)
err := datastore.Get(qs.context, key, node)
@ -537,21 +535,24 @@ func (qs *QuadStore) QuadDirection(val graph.Value, dir quad.Direction) graph.Va
case quad.Subject:
offset = 0
case quad.Predicate:
offset = (qs.hashSize * 2)
offset = (hashSize * 2)
case quad.Object:
offset = (qs.hashSize * 2) * 2
offset = (hashSize * 2) * 2
case quad.Label:
offset = (qs.hashSize * 2) * 3
offset = (hashSize * 2) * 3
}
sub := t.Hash[offset : offset+(qs.hashSize*2)]
sub := t.Hash[offset : offset+(hashSize*2)]
return &Token{Kind: nodeKind, Hash: sub}
}
func (qs *QuadStore) hashOf(s string, hasher hash.Hash) string {
hasher.Reset()
key := make([]byte, 0, qs.hashSize)
hasher.Write([]byte(s))
key = hasher.Sum(key)
func hashOf(s string) string {
h := hashPool.Get().(hash.Hash)
h.Reset()
defer hashPool.Put(h)
key := make([]byte, 0, hashSize)
h.Write([]byte(s))
key = h.Sum(key)
return hex.EncodeToString(key)
}