/
queue.go
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/
queue.go
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// Copyright 2023 Cloudera. All Rights Reserved.
//
// This file is licensed under the Apache License Version 2.0 (the "License").
// You may not use this file except in compliance with the License.
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.
//
// This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
// OF ANY KIND, either express or implied. Refer to the License for the specific
// permissions and limitations governing your use of the file.
package utils
import "fmt"
type Queue[T any] interface {
Enqueue(T) error
Dequeue() (T, error)
Len() int
}
var (
ErrQueueEmpty = fmt.Errorf("QUEUE EMPTY")
)
type SliceQueue[T any] []T
func NewSliceQueue[T any]() Queue[T] {
return &SliceQueue[T]{}
}
func (q *SliceQueue[T]) Len() int {
return len(*q)
}
func (q *SliceQueue[T]) Enqueue(value T) error {
*q = append(*q, value)
return nil
}
func (q *SliceQueue[T]) Dequeue() (T, error) {
queue := *q
if len(*q) > 0 {
card := queue[0]
*q = queue[1:]
return card, nil
}
var empty T
return empty, ErrQueueEmpty
}