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- // 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")
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