94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
package graphvent
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import (
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"encoding/json"
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)
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type SignalDirection int
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const (
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Up SignalDirection = iota
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Down
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Direct
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)
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// GraphSignals are passed around the event tree/resource DAG and cast by Type()
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type GraphSignal interface {
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// How to propogate the signal
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Direction() SignalDirection
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Type() string
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String() string
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}
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// BaseSignal is the most basic type of signal, it has no additional data
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type BaseSignal struct {
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FDirection SignalDirection `json:"direction"`
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FType string `json:"type"`
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}
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func (state BaseSignal) String() string {
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ser, err := json.Marshal(state)
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if err != nil {
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return "STATE_SER_ERR"
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}
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return string(ser)
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}
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func (signal BaseSignal) Direction() SignalDirection {
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return signal.FDirection
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}
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func (signal BaseSignal) Type() string {
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return signal.FType
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}
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func NewBaseSignal(_type string, direction SignalDirection) BaseSignal {
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signal := BaseSignal{
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FDirection: direction,
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FType: _type,
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}
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return signal
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}
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func NewDownSignal(_type string) BaseSignal {
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return NewBaseSignal(_type, Down)
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}
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func NewSignal(_type string) BaseSignal {
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return NewBaseSignal(_type, Up)
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}
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func NewDirectSignal(_type string) BaseSignal {
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return NewBaseSignal(_type, Direct)
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}
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var AbortSignal = NewBaseSignal("abort", Down)
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var StopSignal = NewBaseSignal("stop", Down)
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type IDSignal struct {
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BaseSignal
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ID NodeID `json:"id"`
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}
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func NewIDSignal(_type string, direction SignalDirection, id NodeID) IDSignal {
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return IDSignal{
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BaseSignal: NewBaseSignal(_type, direction),
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ID: id,
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}
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}
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func NewStatusSignal(_type string, source NodeID) IDSignal {
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return NewIDSignal(_type, Up, source)
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}
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type StartChildSignal struct {
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IDSignal
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Action string `json:"action"`
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}
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func NewStartChildSignal(child_id NodeID, action string) StartChildSignal {
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return StartChildSignal{
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IDSignal: NewIDSignal("start_child", Direct, child_id),
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Action: action,
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}
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}
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