Платформа ЦРНП "Мирокод" для разработки проектов
https://git.mirocod.ru
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29 lines
1010 B
29 lines
1010 B
// Copyright 2020 The Gitea Authors. All rights reserved. |
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// Use of this source code is governed by a MIT-style |
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// license that can be found in the LICENSE file. |
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package queue |
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import ( |
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"fmt" |
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) |
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// UniqueQueue defines a queue which guarantees only one instance of same |
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// data is in the queue. Instances with same identity will be |
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// discarded if there is already one in the line. |
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// |
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// This queue is particularly useful for preventing duplicated task |
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// of same purpose - please note that this does not guarantee that a particular |
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// task cannot be processed twice or more at the same time. Uniqueness is |
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// only guaranteed whilst the task is waiting in the queue. |
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// |
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// Users of this queue should be careful to push only the identifier of the |
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// data |
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type UniqueQueue interface { |
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Queue |
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PushFunc(Data, func() error) error |
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Has(Data) (bool, error) |
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} |
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// ErrAlreadyInQueue is returned when trying to push data to the queue that is already in the queue |
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var ErrAlreadyInQueue = fmt.Errorf("already in queue")
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