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node.go
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2019 CERN and copyright holders of ALICE O².
* Author: Teo Mrnjavac <teo.mrnjavac@cern.ch>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* In applying this license CERN does not waive the privileges and
* immunities granted to it by virtue of its status as an
* Intergovernmental Organization or submit itself to any jurisdiction.
*/
package node
import (
"github.com/AliceO2Group/Control/common/event"
"github.com/AliceO2Group/Control/common/node/state"
)
type Handler func(n Node, e event.Event) error
type Path string
type Node interface {
Run(<-chan event.Trigger, chan<- event.Event) error
GetPath() Path
GetName() string
processEvent(e event.Event) error
}
type BaseNode struct {
parent Node
name string
pending map[event.Trigger]struct{}
handlers map[event.Type]Handler
children []Node
fromChildren <-chan event.Event
toChildren chan<- event.Trigger
state state.State
}
func (b *BaseNode) GetName() string {
return b.name
}
func (b *BaseNode) GetPath() Path {
if b.parent == nil {
return Path(b.name)
}
return Path(string(b.parent.GetPath()) + "." + b.name)
}
func (b *BaseNode) processEvent(e event.Event) error {
if handler, ok := b.handlers[e.GetType()]; ok && handler != nil {
return handler(b, e)
}
return nil
}
func (b *BaseNode) Run(fromParent <-chan event.Trigger, toParent chan<- event.Event) error {
for {
if b.state.IsStable() {
select {
case e := <-fromParent:
err := b.processEvent(e)
if err != nil {
toParent <- err //todo fix this with a TriggerHandlerError
}
b.pending[e] = struct{}{}
}
}
select {
case e := <- b.fromChildren:
err := b.processEvent(e)
if err != nil {
toParent <- err
}
case t <- timeout:
}
}
}