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observer.go
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observer.go
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package services
import (
"context"
"os"
"sync"
)
// Observer will be called Before and After some actions by a `Runner`.
type Observer interface {
BeforeStart(context.Context, Service)
AfterStart(context.Context, Service, error)
BeforeStop(context.Context, Service)
AfterStop(context.Context, Service, error)
BeforeLoad(context.Context, Configurable)
AfterLoad(context.Context, Configurable, error)
SignalReceived(os.Signal)
}
// runnerObserver is an Observer implementation used by Runner to broadcast the events to the observers.
type runnerObserver struct {
initObserver sync.Once
observers []Observer
}
func (r *runnerObserver) BeforeStart(ctx context.Context, service Service) {
for _, o := range r.observers {
o.BeforeStart(ctx, service)
}
}
func (r *runnerObserver) AfterStart(ctx context.Context, service Service, err error) {
for _, o := range r.observers {
o.AfterStart(ctx, service, err)
}
}
func (r *runnerObserver) BeforeStop(ctx context.Context, service Service) {
for _, o := range r.observers {
o.BeforeStop(ctx, service)
}
}
func (r *runnerObserver) AfterStop(ctx context.Context, service Service, err error) {
for _, o := range r.observers {
o.AfterStop(ctx, service, err)
}
}
func (r *runnerObserver) BeforeLoad(ctx context.Context, configurable Configurable) {
for _, o := range r.observers {
o.BeforeLoad(ctx, configurable)
}
}
func (r *runnerObserver) AfterLoad(ctx context.Context, configurable Configurable, err error) {
for _, o := range r.observers {
o.AfterLoad(ctx, configurable, err)
}
}
func (r *runnerObserver) SignalReceived(signal os.Signal) {
for _, o := range r.observers {
o.SignalReceived(signal)
}
}
func (r *runnerObserver) Add(observer Observer) {
r.initObserver.Do(func() {
r.observers = make([]Observer, 0)
})
r.observers = append(r.observers, observer)
}