/
backend.go
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/
backend.go
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// Copyright 2016 IBM Corporation
//
// 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 cluster
import "errors"
// BackendType defines the type of backend used for the cluster
type BackendType int
// Available backend types
const (
UnspecifiedBackend BackendType = iota // Zero-value
FilesystemBackend
MemoryBackend
)
type backend interface {
WriteMember(m *member) error
DeleteMember(id MemberID) error
ReadMember(id MemberID) (*member, error)
ReadMembers() (map[MemberID]*member, error)
ReadMemberIDs() (map[MemberID]struct{}, error)
}
func newBackend(conf *Config) (backend, error) {
switch conf.BackendType {
case FilesystemBackend:
return newFilesystemBackend(conf.Directory, conf.TTL*3)
case MemoryBackend:
return newMemoryBackend(), nil
default:
return nil, errors.New("No backend type configured")
}
}