51a59cb05c
an IndexAlias allows you easily work with one logical Index while changing the actual Index its pointing to behind the scenes Changing which actual Index is backing an IndexAlias can be done atomically so that your application smoothly transitions from one Index to another. A separate use of IndexAlias is allowed when the IndexAlias is defined to point to multiple Indexes. In this case only the Search() operation is supported, but the Search will be run on each of the underlying indexes in parallel, and the results will be merged.
121 lines
3.2 KiB
Go
121 lines
3.2 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package http
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import (
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"fmt"
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"sync"
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"github.com/blevesearch/bleve"
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)
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var indexNameMapping map[string]bleve.Index
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var indexNameMappingLock sync.RWMutex
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var indexStats = bleve.IndexStats{}
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func RegisterIndexName(name string, idx bleve.Index) {
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indexNameMappingLock.Lock()
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defer indexNameMappingLock.Unlock()
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if indexNameMapping == nil {
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indexNameMapping = make(map[string]bleve.Index)
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}
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indexNameMapping[name] = idx
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indexStats[name] = idx.Stats()
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}
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func UnregisterIndexByName(name string) bleve.Index {
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indexNameMappingLock.Lock()
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defer indexNameMappingLock.Unlock()
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if indexNameMapping == nil {
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return nil
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}
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rv := indexNameMapping[name]
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if rv != nil {
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delete(indexNameMapping, name)
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}
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delete(indexStats, name)
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return rv
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}
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func IndexByName(name string) bleve.Index {
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indexNameMappingLock.RLock()
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defer indexNameMappingLock.RUnlock()
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return indexNameMapping[name]
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}
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func IndexNames() []string {
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indexNameMappingLock.RLock()
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defer indexNameMappingLock.RUnlock()
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rv := make([]string, len(indexNameMapping))
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count := 0
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for k := range indexNameMapping {
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rv[count] = k
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count++
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}
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return rv
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}
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func IndexStats() bleve.IndexStats {
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return indexStats
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}
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func UpdateAlias(alias string, add, remove []string) error {
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indexNameMappingLock.Lock()
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defer indexNameMappingLock.Unlock()
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index, exists := indexNameMapping[alias]
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if !exists {
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// new alias
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if len(remove) > 0 {
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return fmt.Errorf("cannot remove indexes from a new alias")
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}
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indexes := make([]bleve.Index, len(add))
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for i, addIndexName := range add {
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addIndex, indexExists := indexNameMapping[addIndexName]
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if !indexExists {
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return fmt.Errorf("index named '%s' does not exist", addIndexName)
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}
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indexes[i] = addIndex
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}
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indexAlias := bleve.NewIndexAlias(indexes...)
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indexNameMapping[alias] = indexAlias
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} else {
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// something with this name already exists
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indexAlias, isAlias := index.(bleve.IndexAlias)
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if !isAlias {
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return fmt.Errorf("'%s' is not an alias")
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}
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// build list of add indexes
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addIndexes := make([]bleve.Index, len(add))
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for i, addIndexName := range add {
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addIndex, indexExists := indexNameMapping[addIndexName]
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if !indexExists {
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return fmt.Errorf("index named '%s' does not exist", addIndexName)
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}
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addIndexes[i] = addIndex
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}
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// build list of remove indexes
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removeIndexes := make([]bleve.Index, len(add))
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for i, removeIndexName := range add {
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removeIndex, indexExists := indexNameMapping[removeIndexName]
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if !indexExists {
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return fmt.Errorf("index named '%s' does not exist", removeIndexName)
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}
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removeIndexes[i] = removeIndex
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}
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indexAlias.Swap(addIndexes, removeIndexes)
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}
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return nil
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}
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