// 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 queueimport ( "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// datatype 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 queuevar ErrAlreadyInQueue = fmt.Errorf("already in queue")
// 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")