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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 rsm
import (
"io"
)
// ServiceID is a service identifier
type ServiceID ServiceId
// ServiceContext provides information about the context within which a service is running
type ServiceContext interface {
PartitionContext
// ServiceID is the service identifier
ServiceID() ServiceID
// ServiceType returns the service type
ServiceType() string
// CurrentOperation returns the current operation identifier
CurrentOperation() OperationID
// CurrentSession returns the current session
CurrentSession() Session
// Session returns the session with the given identifier
Session(id SessionID) Session
// Sessions returns a list of open sessions
Sessions() []Session
}
// internalContext provides setters for the service context
type internalContext interface {
ServiceContext
setCurrentOperation(op OperationID)
setCurrentSession(session Session)
addSession(session Session)
removeSession(session Session)
}
func newServiceContext(ctx PartitionContext, id ServiceID) ServiceContext {
return &serviceContext{
PartitionContext: ctx,
serviceID: id,
sessions: make(map[SessionID]Session),
}
}
// serviceContext is a default implementation of the service context
type serviceContext struct {
PartitionContext
serviceID ServiceID
sessions map[SessionID]Session
currentSession Session
currentOp OperationID
}
func (c *serviceContext) ServiceID() ServiceID {
return c.serviceID
}
func (c *serviceContext) ServiceType() string {
return c.serviceID.Type
}
func (c *serviceContext) CurrentOperation() OperationID {
return c.currentOp
}
// setOperation sets the current operation
func (c *serviceContext) setCurrentOperation(op OperationID) {
c.currentOp = op
}
func (c *serviceContext) CurrentSession() Session {
return c.currentSession
}
// setCurrentSession sets the current session
func (c *serviceContext) setCurrentSession(session Session) {
c.currentSession = session
}
func (c *serviceContext) Session(id SessionID) Session {
return c.sessions[id]
}
func (c *serviceContext) Sessions() []Session {
sessions := make([]Session, 0, len(c.sessions))
for _, session := range c.sessions {
sessions = append(sessions, session)
}
return sessions
}
// addSession adds a session to the service
func (c *serviceContext) addSession(session Session) {
c.sessions[session.ID()] = session
}
// removeSession removes a session from the service
func (c *serviceContext) removeSession(session Session) {
delete(c.sessions, session.ID())
}
var _ ServiceContext = &serviceContext{}
// SessionOpenService is an interface for listening to session open events
type SessionOpenService interface {
// SessionOpen is called when a session is opened for a service
SessionOpen(Session)
}
// SessionClosedService is an interface for listening to session closed events
type SessionClosedService interface {
// SessionClosed is called when a session is closed for a service
SessionClosed(Session)
}
// SessionExpiredService is an interface for listening to session expired events
type SessionExpiredService interface {
// SessionExpired is called when a session is expired for a service
SessionExpired(Session)
}
// BackupService is an interface for backing up a service
type BackupService interface {
// Backup is called to take a snapshot of the service state
Backup(writer io.Writer) error
}
// RestoreService is an interface for restoring up a service
type RestoreService interface {
// Restore is called to restore the service state from a snapshot
Restore(reader io.Reader) error
}
// Service is a primitive service
type Service interface {
BackupService
RestoreService
Executor
Scheduler
internalContext
}
// NewService creates a new primitive service
func NewService(scheduler Scheduler, context ServiceContext) Service {
return &managedService{
Executor: newExecutor(),
Scheduler: scheduler,
internalContext: context.(internalContext),
}
}
// managedService is a primitive service
type managedService struct {
BackupService
RestoreService
Executor
Scheduler
internalContext
}