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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package queue
import (
"context"
"fmt"
"reflect"
"time"
"code.gitea.io/gitea/modules/log"
)
// ChannelQueueType is the type for channel queue
const ChannelQueueType Type = "channel"
// ChannelQueueConfiguration is the configuration for a ChannelQueue
type ChannelQueueConfiguration struct {
QueueLength int
BatchLength int
Workers int
MaxWorkers int
BlockTimeout time.Duration
BoostTimeout time.Duration
BoostWorkers int
Name string
}
// ChannelQueue implements
type ChannelQueue struct {
pool *WorkerPool
exemplar interface{}
workers int
name string
}
// NewChannelQueue create a memory channel queue
func NewChannelQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
configInterface, err := toConfig(ChannelQueueConfiguration{}, cfg)
if err != nil {
return nil, err
}
config := configInterface.(ChannelQueueConfiguration)
if config.BatchLength == 0 {
config.BatchLength = 1
}
dataChan := make(chan Data, config.QueueLength)
ctx, cancel := context.WithCancel(context.Background())
queue := &ChannelQueue{
pool: &WorkerPool{
baseCtx: ctx,
cancel: cancel,
batchLength: config.BatchLength,
handle: handle,
dataChan: dataChan,
blockTimeout: config.BlockTimeout,
boostTimeout: config.BoostTimeout,
boostWorkers: config.BoostWorkers,
maxNumberOfWorkers: config.MaxWorkers,
},
exemplar: exemplar,
workers: config.Workers,
name: config.Name,
}
queue.pool.qid = GetManager().Add(queue, ChannelQueueType, config, exemplar, queue.pool)
return queue, nil
}
// Run starts to run the queue
func (c *ChannelQueue) Run(atShutdown, atTerminate func(context.Context, func())) {
atShutdown(context.Background(), func() {
log.Warn("ChannelQueue: %s is not shutdownable!", c.name)
})
atTerminate(context.Background(), func() {
log.Warn("ChannelQueue: %s is not terminatable!", c.name)
})
go func() {
_ = c.pool.AddWorkers(c.workers, 0)
}()
}
// Push will push data into the queue
func (c *ChannelQueue) Push(data Data) error {
if c.exemplar != nil {
// Assert data is of same type as r.exemplar
t := reflect.TypeOf(data)
exemplarType := reflect.TypeOf(c.exemplar)
if !t.AssignableTo(exemplarType) || data == nil {
return fmt.Errorf("Unable to assign data: %v to same type as exemplar: %v in queue: %s", data, c.exemplar, c.name)
}
}
c.pool.Push(data)
return nil
}
// Name returns the name of this queue
func (c *ChannelQueue) Name() string {
return c.name
}
func init() {
queuesMap[ChannelQueueType] = NewChannelQueue
}
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