func New(mo store.MergeOperator, config map[string]interface{}) (store.KVStore, error) {
name, ok := config["kvStoreName_actual"].(string)
if !ok || name == "" {
return nil, fmt.Errorf("metrics: missing kvStoreName_actual,"+
" config: %#v", config)
}
if name == Name {
return nil, fmt.Errorf("metrics: circular kvStoreName_actual")
}
ctr := registry.KVStoreConstructorByName(name)
if ctr == nil {
return nil, fmt.Errorf("metrics: no kv store constructor,"+
" kvStoreName_actual: %s", name)
}
kvs, err := ctr(mo, config)
if err != nil {
return nil, err
}
return &Store{
o: kvs,
TimerReaderGet: metrics.NewTimer(),
TimerReaderMultiGet: metrics.NewTimer(),
TimerReaderPrefixIterator: metrics.NewTimer(),
TimerReaderRangeIterator: metrics.NewTimer(),
TimerWriterExecuteBatch: metrics.NewTimer(),
TimerIteratorSeek: metrics.NewTimer(),
TimerIteratorNext: metrics.NewTimer(),
TimerBatchMerge: metrics.NewTimer(),
errors: list.New(),
}, nil
}
func (udc *UpsideDownCouch) Open() (err error) {
//acquire the write mutex for the duratin of Open()
udc.writeMutex.Lock()
defer udc.writeMutex.Unlock()
// open the kv store
storeConstructor := registry.KVStoreConstructorByName(udc.storeName)
if storeConstructor == nil {
err = index.ErrorUnknownStorageType
return
}
// now open the store
udc.store, err = storeConstructor(&mergeOperator, udc.storeConfig)
if err != nil {
return
}
// start a reader to look at the index
var kvreader store.KVReader
kvreader, err = udc.store.Reader()
if err != nil {
return
}
var value []byte
value, err = kvreader.Get(VersionKey)
if err != nil {
_ = kvreader.Close()
return
}
if value != nil {
err = udc.loadSchema(kvreader)
if err != nil {
_ = kvreader.Close()
return
}
// set doc count
udc.m.Lock()
udc.docCount, err = udc.countDocs(kvreader)
udc.m.Unlock()
err = kvreader.Close()
} else {
// new index, close the reader and open writer to init
err = kvreader.Close()
if err != nil {
return
}
var kvwriter store.KVWriter
kvwriter, err = udc.store.Writer()
if err != nil {
return
}
defer func() {
if cerr := kvwriter.Close(); err == nil && cerr != nil {
err = cerr
}
}()
// init the index
err = udc.init(kvwriter)
}
return
}
func (f *Firestorm) Open() (err error) {
// open the kv store
storeConstructor := registry.KVStoreConstructorByName(f.storeName)
if storeConstructor == nil {
err = index.ErrorUnknownStorageType
return
}
// now open the store
f.store, err = storeConstructor(&mergeOperator, f.storeConfig)
if err != nil {
return
}
// start a reader
var kvreader store.KVReader
kvreader, err = f.store.Reader()
if err != nil {
return
}
// assert correct version, and find out if this is new index
var newIndex bool
newIndex, err = f.checkVersion(kvreader)
if err != nil {
return
}
if !newIndex {
// process existing index before opening
err = f.warmup(kvreader)
if err != nil {
return
}
}
err = kvreader.Close()
if err != nil {
return
}
if newIndex {
// prepare a new index
err = f.bootstrap()
if err != nil {
return
}
}
// start the garbage collector
f.garbageCollector.Start()
// start the lookuper
f.lookuper.Start()
// start the dict updater
f.dictUpdater.Start()
return
}