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map.go
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map.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package namespace
import (
"errors"
"fmt"
xerrors "github.com/m3db/m3/src/x/errors"
"github.com/m3db/m3/src/x/ident"
)
var (
errEmptyMetadatas = errors.New("no namespace metadata provided")
)
type nsMap struct {
namespaces *metadataMap
ids []ident.ID
metadatas []Metadata
}
// NewMap returns a new registry containing provided metadatas,
// providing a consistent order.
func NewMap(metadatas []Metadata) (Map, error) {
if len(metadatas) == 0 {
return nil, errEmptyMetadatas
}
var (
ns = newMetadataMap(metadataMapOptions{})
ids = make([]ident.ID, 0, len(metadatas))
nsMetadatas = make([]Metadata, 0, len(metadatas))
multiErr xerrors.MultiError
)
for _, m := range metadatas {
id := m.ID()
ids = append(ids, id)
nsMetadatas = append(nsMetadatas, m)
if _, ok := ns.Get(id); ok {
multiErr = multiErr.Add(fmt.Errorf(
"namespace ids must be unique, duplicate found: %v", id.String()))
}
ns.Set(id, m)
}
if err := multiErr.FinalError(); err != nil {
return nil, err
}
return &nsMap{
namespaces: ns,
ids: ids,
metadatas: nsMetadatas,
}, nil
}
func (r *nsMap) Get(namespace ident.ID) (Metadata, error) {
metadata, ok := r.namespaces.Get(namespace)
if !ok {
return nil, fmt.Errorf("unable to find namespace (%v) in registry", namespace.String())
}
return metadata, nil
}
func (r *nsMap) IDs() []ident.ID {
return r.ids
}
func (r *nsMap) Metadatas() []Metadata {
return r.metadatas
}
func (r *nsMap) Equal(value Map) bool {
// short circuit ptr equals
if value == r {
return true
}
ourMds := r.Metadatas()
theirMds := value.Metadatas()
if len(ourMds) != len(theirMds) {
return false
}
// O(n**2) test, not a big deal because this is only 3-5 elements
for _, om := range ourMds {
found := false
for _, tm := range theirMds {
if om.Equal(tm) {
found = true
break
}
}
if !found {
return false
}
}
return true
}