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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"
"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 {
WorkerPoolConfiguration
Workers int
Name string
}
// ChannelQueue implements Queue
//
// A channel queue is not persistable and does not shutdown or terminate cleanly
// It is basically a very thin wrapper around a WorkerPool
type ChannelQueue struct {
*WorkerPool
exemplar interface{}
workers int
name string
}
// NewChannelQueue creates 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
}
queue := &ChannelQueue{
WorkerPool: NewWorkerPool(handle, config.WorkerPoolConfiguration),
exemplar: exemplar,
workers: config.Workers,
name: config.Name,
}
queue.qid = GetManager().Add(queue, ChannelQueueType, config, exemplar)
return queue, nil
}
// Run starts to run the queue
func (q *ChannelQueue) Run(atShutdown, atTerminate func(context.Context, func())) {
atShutdown(context.Background(), func() {
log.Warn("ChannelQueue: %s is not shutdownable!", q.name)
})
atTerminate(context.Background(), func() {
log.Warn("ChannelQueue: %s is not terminatable!", q.name)
})
log.Debug("ChannelQueue: %s Starting", q.name)
go func() {
_ = q.AddWorkers(q.workers, 0)
}()
}
// Push will push data into the queue
func (q *ChannelQueue) Push(data Data) error {
if !assignableTo(data, q.exemplar) {
return fmt.Errorf("Unable to assign data: %v to same type as exemplar: %v in queue: %s", data, q.exemplar, q.name)
}
q.WorkerPool.Push(data)
return nil
}
// Name returns the name of this queue
func (q *ChannelQueue) Name() string {
return q.name
}
func init() {
queuesMap[ChannelQueueType] = NewChannelQueue
}
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