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pool.go
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pool.go
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// Copyright (c) 2022 Proton AG
//
// This file is part of Proton Mail Bridge.
//
// Proton Mail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Proton Mail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
package pool
import (
"sync"
"github.com/ljanyst/peroxide/pkg/pchan"
)
type WorkFunc func(interface{}, int) (interface{}, error)
type DoneFunc func()
type Pool struct {
jobCh *pchan.PChan
}
func New(size int, work WorkFunc) *Pool {
jobCh := pchan.New()
for i := 0; i < size; i++ {
go func() {
for {
val, prio, ok := jobCh.Pop()
if !ok {
return
}
job, ok := val.(*Job)
if !ok {
panic("bad result type")
}
res, err := work(job.req, prio)
if err != nil {
job.postFailure(err)
} else {
job.postSuccess(res)
}
job.waitDone()
}
}()
}
return &Pool{jobCh: jobCh}
}
func (pool *Pool) NewJob(req interface{}, prio int) (*Job, DoneFunc) {
job := newJob(req)
job.setItem(pool.jobCh.Push(job, prio))
return job, job.markDone
}
type Job struct {
req interface{}
res interface{}
err error
item *pchan.Item
ready, done sync.WaitGroup
once sync.Once
}
func newJob(req interface{}) *Job {
job := &Job{req: req}
job.ready.Add(1)
job.done.Add(1)
return job
}
func (job *Job) GetResult() (interface{}, error) {
job.ready.Wait()
return job.res, job.err
}
func (job *Job) GetPriority() int {
return job.item.GetPriority()
}
func (job *Job) SetPriority(prio int) {
job.item.SetPriority(prio)
}
func (job *Job) postSuccess(res interface{}) {
defer job.ready.Done()
job.res = res
}
func (job *Job) postFailure(err error) {
defer job.ready.Done()
job.err = err
}
func (job *Job) setItem(item *pchan.Item) {
job.item = item
}
func (job *Job) markDone() {
job.once.Do(func() { job.done.Done() })
}
func (job *Job) waitDone() {
job.done.Wait()
}