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service.go
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service.go
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// Copyright 2019-present Open Networking Foundation.
//
// 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 set
import (
setapi "github.com/atomix/atomix-api/go/atomix/primitive/set"
"github.com/atomix/atomix-go-framework/pkg/atomix/errors"
"github.com/atomix/atomix-go-framework/pkg/atomix/meta"
)
func init() {
registerServiceFunc(newService)
}
func newService(context ServiceContext) Service {
return &setService{
ServiceContext: context,
values: make(map[string]meta.ObjectMeta),
}
}
// setService is a state machine for a list primitive
type setService struct {
ServiceContext
values map[string]meta.ObjectMeta
}
func (s *setService) Backup(writer SnapshotWriter) error {
values := make([]SetValue, 0, len(s.values))
for value, obj := range s.values {
values = append(values, SetValue{
ObjectMeta: obj.Proto(),
Value: value,
})
}
return writer.WriteState(&SetState{
Values: values,
})
}
func (s *setService) Restore(reader SnapshotReader) error {
state, err := reader.ReadState()
if err != nil {
return err
}
s.values = make(map[string]meta.ObjectMeta)
for _, value := range state.Values {
s.values[value.Value] = meta.FromProto(value.ObjectMeta)
}
return nil
}
func (s *setService) notify(event setapi.Event) error {
output := &setapi.EventsResponse{
Event: event,
}
for _, events := range s.Proposals().Events().List() {
if err := events.Notify(output); err != nil {
return err
}
}
return nil
}
func (s *setService) Size(size SizeProposal) error {
return size.Reply(&setapi.SizeResponse{
Size_: uint32(len(s.values)),
})
}
func (s *setService) Contains(contains ContainsProposal) error {
_, ok := s.values[contains.Request().Element.Value]
return contains.Reply(&setapi.ContainsResponse{
Contains: ok,
})
}
func (s *setService) Add(add AddProposal) error {
if _, ok := s.values[add.Request().Element.Value]; ok {
return errors.NewAlreadyExists("value already exists")
}
s.values[add.Request().Element.Value] = meta.FromProto(add.Request().Element.ObjectMeta)
err := s.notify(setapi.Event{
Type: setapi.Event_ADD,
Element: add.Request().Element,
})
if err != nil {
return err
}
return add.Reply(&setapi.AddResponse{
Element: add.Request().Element,
})
}
func (s *setService) Remove(remove RemoveProposal) error {
object, ok := s.values[remove.Request().Element.Value]
if !ok {
return errors.NewNotFound("value not found")
}
if !object.Equal(meta.FromProto(remove.Request().Element.ObjectMeta)) {
return errors.NewConflict("metadata mismatch")
}
delete(s.values, remove.Request().Element.Value)
element := setapi.Element{
ObjectMeta: object.Proto(),
Value: remove.Request().Element.Value,
}
err := s.notify(setapi.Event{
Type: setapi.Event_REMOVE,
Element: element,
})
if err != nil {
return err
}
return remove.Reply(&setapi.RemoveResponse{
Element: element,
})
}
func (s *setService) Clear(clear ClearProposal) error {
s.values = make(map[string]meta.ObjectMeta)
return clear.Reply(&setapi.ClearResponse{})
}
func (s *setService) Events(events EventsProposal) error {
if events.Request().Replay {
for value, metadata := range s.values {
err := events.Notify(&setapi.EventsResponse{
Event: setapi.Event{
Type: setapi.Event_REPLAY,
Element: setapi.Element{
ObjectMeta: metadata.Proto(),
Value: value,
},
},
})
if err != nil {
return err
}
}
}
return nil
}
func (s *setService) Elements(elements ElementsProposal) error {
defer elements.Close()
for value, object := range s.values {
err := elements.Notify(&setapi.ElementsResponse{
Element: setapi.Element{
ObjectMeta: object.Proto(),
Value: value,
},
})
if err != nil {
return err
}
}
return nil
}