Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

registry/store.go

@@ -0,0 +1,52 @@
+//  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 registry
+
+import (
+	"fmt"
+
+	store "github.com/blevesearch/upsidedown_store_api"
+)
+
+func RegisterKVStore(name string, constructor KVStoreConstructor) error {
+	_, exists := stores[name]
+	if exists {
+		return fmt.Errorf("attempted to register duplicate store named '%s'", name)
+	}
+	stores[name] = constructor
+	return nil
+}
+
+// KVStoreConstructor is used to build a KVStore of a specific type when
+// specificied by the index configuration. In addition to meeting the
+// store.KVStore interface, KVStores must also support this constructor.
+// Note that currently the values of config must
+// be able to be marshaled and unmarshaled using the encoding/json library (used
+// when reading/writing the index metadata file).
+type KVStoreConstructor func(mo store.MergeOperator, config map[string]interface{}) (store.KVStore, error)
+type KVStoreRegistry map[string]KVStoreConstructor
+
+func KVStoreConstructorByName(name string) KVStoreConstructor {
+	return stores[name]
+}
+
+func KVStoreTypesAndInstances() ([]string, []string) {
+	var types []string
+	var instances []string
+	for name := range stores {
+		types = append(types, name)
+	}
+	return types, instances
+}