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// Copyright (c) 2014 Couchbase, Inc.
//
// 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 http
import (
"fmt"
"sync"
"github.com/blevesearch/bleve"
)
var indexNameMapping map[string]bleve.Index
var indexNameMappingLock sync.RWMutex
func RegisterIndexName(name string, idx bleve.Index) {
indexNameMappingLock.Lock()
defer indexNameMappingLock.Unlock()
if indexNameMapping == nil {
indexNameMapping = make(map[string]bleve.Index)
}
indexNameMapping[name] = idx
}
func UnregisterIndexByName(name string) bleve.Index {
indexNameMappingLock.Lock()
defer indexNameMappingLock.Unlock()
if indexNameMapping == nil {
return nil
}
rv := indexNameMapping[name]
if rv != nil {
delete(indexNameMapping, name)
}
return rv
}
func IndexByName(name string) bleve.Index {
indexNameMappingLock.RLock()
defer indexNameMappingLock.RUnlock()
return indexNameMapping[name]
}
func IndexNames() []string {
indexNameMappingLock.RLock()
defer indexNameMappingLock.RUnlock()
rv := make([]string, len(indexNameMapping))
count := 0
for k := range indexNameMapping {
rv[count] = k
count++
}
return rv
}
func UpdateAlias(alias string, add, remove []string) error {
indexNameMappingLock.Lock()
defer indexNameMappingLock.Unlock()
index, exists := indexNameMapping[alias]
if !exists {
// new alias
if len(remove) > 0 {
return fmt.Errorf("cannot remove indexes from a new alias")
}
indexes := make([]bleve.Index, len(add))
for i, addIndexName := range add {
addIndex, indexExists := indexNameMapping[addIndexName]
if !indexExists {
return fmt.Errorf("index named '%s' does not exist", addIndexName)
}
indexes[i] = addIndex
}
indexAlias := bleve.NewIndexAlias(indexes...)
indexNameMapping[alias] = indexAlias
} else {
// something with this name already exists
indexAlias, isAlias := index.(bleve.IndexAlias)
if !isAlias {
return fmt.Errorf("'%s' is not an alias", alias)
}
// build list of add indexes
addIndexes := make([]bleve.Index, len(add))
for i, addIndexName := range add {
addIndex, indexExists := indexNameMapping[addIndexName]
if !indexExists {
return fmt.Errorf("index named '%s' does not exist", addIndexName)
}
addIndexes[i] = addIndex
}
// build list of remove indexes
removeIndexes := make([]bleve.Index, len(remove))
for i, removeIndexName := range remove {
removeIndex, indexExists := indexNameMapping[removeIndexName]
if !indexExists {
return fmt.Errorf("index named '%s' does not exist", removeIndexName)
}
removeIndexes[i] = removeIndex
}
indexAlias.Swap(addIndexes, removeIndexes)
}
return nil
}
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