mirror of
https://github.com/go-gitea/gitea
synced 2024-11-25 13:22:52 +01:00
30 lines
1,010 B
Go
30 lines
1,010 B
Go
|
// Copyright 2020 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 (
|
||
|
|
"fmt"
|
||
|
|
)
|
||
|
|
|
||
|
|
// UniqueQueue defines a queue which guarantees only one instance of same
|
||
|
|
// data is in the queue. Instances with same identity will be
|
||
|
|
// discarded if there is already one in the line.
|
||
|
|
//
|
||
|
|
// This queue is particularly useful for preventing duplicated task
|
||
|
|
// of same purpose - please note that this does not guarantee that a particular
|
||
|
|
// task cannot be processed twice or more at the same time. Uniqueness is
|
||
|
|
// only guaranteed whilst the task is waiting in the queue.
|
||
|
|
//
|
||
|
|
// Users of this queue should be careful to push only the identifier of the
|
||
|
|
// data
|
||
|
|
type UniqueQueue interface {
|
||
|
|
Queue
|
||
|
|
PushFunc(Data, func() error) error
|
||
|
|
Has(Data) (bool, error)
|
||
|
|
}
|
||
|
|
|
||
|
|
// ErrAlreadyInQueue is returned when trying to push data to the queue that is already in the queue
|
||
|
|
var ErrAlreadyInQueue = fmt.Errorf("already in queue")
|