/
node.go
76 lines (64 loc) · 1.9 KB
/
node.go
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/*
* node.go
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* 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.
*/
// FoundationDB Go Directory Layer
package directory
import (
"bytes"
"github.com/apple/foundationdb/bindings/go/src/fdb"
"github.com/apple/foundationdb/bindings/go/src/fdb/subspace"
)
type node struct {
subspace subspace.Subspace
path []string
targetPath []string
_layer fdb.FutureByteSlice
}
func (n *node) exists() bool {
if n.subspace == nil {
return false
}
return true
}
func (n *node) prefetchMetadata(rtr fdb.ReadTransaction) *node {
if n.exists() {
n.layer(rtr)
}
return n
}
func (n *node) layer(rtr fdb.ReadTransaction) fdb.FutureByteSlice {
if n._layer == nil {
fv := rtr.Get(n.subspace.Sub([]byte("layer")))
n._layer = fv
}
return n._layer
}
func (n *node) isInPartition(tr *fdb.Transaction, includeEmptySubpath bool) bool {
return n.exists() && bytes.Compare(n._layer.MustGet(), []byte("partition")) == 0 && (includeEmptySubpath || len(n.targetPath) > len(n.path))
}
func (n *node) getPartitionSubpath() []string {
return n.targetPath[len(n.path):]
}
func (n *node) getContents(dl directoryLayer, tr *fdb.Transaction) (DirectorySubspace, error) {
l, err := n._layer.Get()
if err != nil {
return nil, err
}
return dl.contentsOfNode(n.subspace, n.path, l)
}