76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
// Copyright 2024 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package priorityqueue
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import "container/heap"
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// AnalysisPriorityQueue is a priority queue for TableAnalysisJobs.
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type AnalysisPriorityQueue struct {
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inner *analysisInnerQueue
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}
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// NewAnalysisPriorityQueue creates a new AnalysisPriorityQueue.
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func NewAnalysisPriorityQueue() *AnalysisPriorityQueue {
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q := &AnalysisPriorityQueue{
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inner: &analysisInnerQueue{},
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}
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heap.Init(q.inner)
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return q
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}
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// Push adds a job to the priority queue with the given weight.
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func (apq *AnalysisPriorityQueue) Push(job *TableAnalysisJob) {
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heap.Push(apq.inner, job)
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}
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// Pop removes the highest priority job from the queue.
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func (apq *AnalysisPriorityQueue) Pop() *TableAnalysisJob {
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return heap.Pop(apq.inner).(*TableAnalysisJob)
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}
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// Len returns the number of jobs in the queue.
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func (apq *AnalysisPriorityQueue) Len() int {
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return apq.inner.Len()
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}
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// An analysisInnerQueue implements heap.Interface and holds TableAnalysisJobs.
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type analysisInnerQueue []*TableAnalysisJob
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// Implement the sort.Interface methods for the priority queue.
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func (aq analysisInnerQueue) Len() int { return len(aq) }
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func (aq analysisInnerQueue) Less(i, j int) bool {
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// We want Pop to give us the highest, not lowest, priority, so we use greater than here.
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return aq[i].Weight > aq[j].Weight
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}
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func (aq analysisInnerQueue) Swap(i, j int) {
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aq[i], aq[j] = aq[j], aq[i]
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}
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// Push adds an item to the priority queue.
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func (aq *analysisInnerQueue) Push(x any) {
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item := x.(*TableAnalysisJob)
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*aq = append(*aq, item)
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}
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// Pop removes the highest priority item from the queue.
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func (aq *analysisInnerQueue) Pop() any {
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old := *aq
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n := len(old)
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item := old[n-1]
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*aq = old[0 : n-1]
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return item
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}
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