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// Copyright 2022 Terin Stock.
// SPDX-License-Identifier: MPL-2.0
package manager
import (
"context"
"sync/atomic"
"golang.org/x/sync/errgroup"
)
type Manager struct {
started uint32
runnables []Runnable
internalCtx context.Context
group *errgroup.Group
}
func New() *Manager {
return &Manager{
runnables: []Runnable{},
}
}
func (m *Manager) Add(r Runnable) error {
if atomic.LoadUint32(&m.started) == 1 {
m.group.Go(func() error {
return r.Start(m.internalCtx)
})
} else {
m.runnables = append(m.runnables, r)
}
return nil
}
func (m *Manager) Start(ctx context.Context) error {
g, internalCtx := errgroup.WithContext(ctx)
m.group = g
m.internalCtx = internalCtx
atomic.SwapUint32(&m.started, 1)
for _, r := range m.runnables {
r := r
g.Go(func() error {
return r.Start(internalCtx)
})
}
m.runnables = nil
return g.Wait()
}
type Runnable interface {
Start(ctx context.Context) error
}
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