github.com/slspeek/camlistore_namedsearch@v0.0.0-20140519202248-ed6f70f7721a/pkg/index/memindex.go (about) 1 /* 2 Copyright 2011 Google Inc. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package index 18 19 import ( 20 "camlistore.org/pkg/blobserver" 21 "camlistore.org/pkg/jsonconfig" 22 "camlistore.org/pkg/sorted" 23 ) 24 25 func init() { 26 blobserver.RegisterStorageConstructor("memory-only-dev-indexer", 27 blobserver.StorageConstructor(newMemoryIndexFromConfig)) 28 } 29 30 // NewMemoryIndex returns an Index backed only by memory, for use in tests. 31 func NewMemoryIndex() *Index { 32 ix, err := New(sorted.NewMemoryKeyValue()) 33 if err != nil { 34 // Nothing to fail in memory, so worth panicing about 35 // if we ever see something. 36 panic(err) 37 } 38 return ix 39 } 40 41 func newMemoryIndexFromConfig(ld blobserver.Loader, config jsonconfig.Obj) (blobserver.Storage, error) { 42 blobPrefix := config.RequiredString("blobSource") 43 if err := config.Validate(); err != nil { 44 return nil, err 45 } 46 sto, err := ld.GetStorage(blobPrefix) 47 if err != nil { 48 return nil, err 49 } 50 51 ix := NewMemoryIndex() 52 ix.BlobSource = sto 53 54 // Good enough, for now: 55 ix.KeyFetcher = ix.BlobSource 56 57 return ix, err 58 }