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command.go
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command.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
// RequestID is a request identifier
type RequestID uint64
// ResponseID is a response identifier
type ResponseID uint64
// CommandID is a command identifier
type CommandID uint64
// Commands provides access to pending commands
type Commands interface {
// Get gets a command by ID
Get(CommandID) (Command, bool)
// List lists all open commands
List(OperationID) []Command
}
func newCommands() *primitiveCommands {
return &primitiveCommands{
commands: make(map[CommandID]Command),
}
}
type primitiveCommands struct {
commands map[CommandID]Command
}
func (s *primitiveCommands) add(command Command) {
s.commands[command.ID()] = command
}
func (s *primitiveCommands) remove(command Command) {
delete(s.commands, command.ID())
}
func (s *primitiveCommands) Get(commandID CommandID) (Command, bool) {
command, ok := s.commands[commandID]
return command, ok
}
func (s *primitiveCommands) List(operationID OperationID) []Command {
commands := make([]Command, 0, len(s.commands))
for _, command := range s.commands {
if command.OperationID() == operationID {
commands = append(commands, command)
}
}
return commands
}
var _ Commands = (*primitiveCommands)(nil)
type CommandState int
const (
CommandPending CommandState = iota
CommandRunning
CommandComplete
)
// Command is a command operation
type Command interface {
Operation
// ID returns the command identifier
ID() CommandID
// State returns the current command state
State() CommandState
// Watch watches the command state
Watch(f func(CommandState)) Watcher
}