/
memory.go
94 lines (77 loc) · 1.44 KB
/
memory.go
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package bus
import (
"errors"
"sync"
"time"
"github.com/abdullin/omni/core"
"github.com/abdullin/omni/core/env"
)
type mem struct {
c chan core.Event
handlers map[string]env.EventHandler
started bool
mu sync.Mutex
}
func (m *mem) AddEventHandler(name string, h env.EventHandler) {
m.handlers[name] = h
}
func (m *mem) MustPublish(es ...core.Event) {
for _, e := range es {
m.c <- e
}
}
func (m *mem) Publish(es ...core.Event) error {
m.MustPublish(es...)
return nil
}
func (m *mem) Start() {
if m.started {
panic("Bus can't be started twice")
}
m.started = true
go func() {
for {
select {
case message := <-m.c:
m.dispatch(message)
}
}
}()
}
func (m *mem) dispatch(e core.Event) {
for name, h := range m.handlers {
if err := handleWithTimeout(h, e); err != nil {
var contract = e.Meta().Contract
l.Panicf("%s @ %s: %s", name, contract, err)
}
}
}
func handleWithTimeout(h env.EventHandler, e core.Event) (err error) {
c := make(chan error, 1)
defer func() {
if r := recover(); r != nil {
err = r.(error)
}
}()
go func() {
c <- h.HandleEvent(e)
}()
select {
case err = <-c:
return
case <-time.After(time.Second):
err = errors.New("Timeout")
}
return
}
type Bus interface {
AddEventHandler(name string, h env.EventHandler)
env.Publisher
Start()
}
func NewMem() Bus {
return &mem{
c: make(chan core.Event, 10000),
handlers: make(map[string]env.EventHandler),
}
}