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event.go
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event.go
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package pico
import (
"fmt"
"time"
// Namespace imports
. "github.com/djthorpe/go-pico"
. "github.com/djthorpe/go-pico/pkg/errors"
)
////////////////////////////////////////////////////////////////////////////////
// TYPES
type event struct {
EventSource
v map[EventField]value
}
type value struct {
v interface{}
u EventUnit
}
////////////////////////////////////////////////////////////////////////////////
// LIFECYCLE
func New(source EventSource) *event {
return &event{
EventSource: source,
v: make(map[EventField]value),
}
}
////////////////////////////////////////////////////////////////////////////////
// PUBLIC METHODS
func (e *event) Source() EventSource {
return e.EventSource
}
func (e *event) Is(f EventField) bool {
_, exists := e.v[f]
return exists
}
func (e *event) Set(f EventField, u EventUnit, v interface{}) Event {
e.v[f] = value{v, u}
return e
}
func (e *event) Value(f EventField) (interface{}, EventUnit) {
if v, exists := e.v[f]; exists {
return v.v, v.u
} else {
return nil, 0
}
}
func (e *event) Emit(C chan<- Event) error {
for i := 0; i < 3; i++ {
select {
case C <- e:
return nil
default:
// Wait
time.Sleep(time.Duration(i) * time.Millisecond)
}
}
return ErrTimeout
}
////////////////////////////////////////////////////////////////////////////////
// STRINGIFY
func (e *event) String() string {
str := "<event"
for k, v := range e.v {
str += fmt.Sprintf(" %v=%v", k, v)
}
return str + ">"
}
func (v value) String() string {
units := fmt.Sprint(v.u)
if units == "" {
return fmt.Sprint(v.v)
} else {
return fmt.Sprint(v.v, " ", units)
}
}