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61 lines
1.0 KiB
Go
61 lines
1.0 KiB
Go
package collection
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import "sync"
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type Queue struct {
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lock sync.Mutex
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elements []interface{}
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size int
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head int
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tail int
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count int
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}
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func NewQueue(size int) *Queue {
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return &Queue{
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elements: make([]interface{}, size),
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size: size,
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}
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}
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func (q *Queue) Empty() bool {
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q.lock.Lock()
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empty := q.count == 0
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q.lock.Unlock()
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return empty
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}
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func (q *Queue) Put(element interface{}) {
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q.lock.Lock()
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defer q.lock.Unlock()
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if q.head == q.tail && q.count > 0 {
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nodes := make([]interface{}, len(q.elements)+q.size)
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copy(nodes, q.elements[q.head:])
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copy(nodes[len(q.elements)-q.head:], q.elements[:q.head])
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q.head = 0
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q.tail = len(q.elements)
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q.elements = nodes
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}
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q.elements[q.tail] = element
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q.tail = (q.tail + 1) % len(q.elements)
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q.count++
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}
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func (q *Queue) Take() (interface{}, bool) {
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q.lock.Lock()
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defer q.lock.Unlock()
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if q.count == 0 {
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return nil, false
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}
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element := q.elements[q.head]
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q.head = (q.head + 1) % len(q.elements)
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q.count--
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return element, true
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}
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