tidb worker 源码
tidb worker 代码
文件路径：/br/pkg/lightning/worker/worker.go
// Copyright 2019 PingCAP, Inc.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package worker
import (
"context"
"time"
"github.com/pingcap/tidb/br/pkg/lightning/metric"
)
// Pool is the worker pool.
type Pool struct {
limit int
workers chan *Worker
name string
metrics *metric.Metrics
}
// Worker is the worker struct.
type Worker struct {
ID int64
}
// NewPool creates a new worker pool.
func NewPool(ctx context.Context, limit int, name string) *Pool {
workers := make(chan *Worker, limit)
for i := 0; i < limit; i++ {
workers <- &Worker{ID: int64(i + 1)}
}
metrics, ok := metric.FromContext(ctx)
if ok {
metrics.IdleWorkersGauge.WithLabelValues(name).Set(float64(limit))
}
return &Pool{
limit: limit,
workers: workers,
name: name,
metrics: metrics,
}
}
// Apply gets a worker from the pool.
func (pool *Pool) Apply() *Worker {
start := time.Now()
worker := <-pool.workers
if pool.metrics != nil {
pool.metrics.IdleWorkersGauge.WithLabelValues(pool.name).Set(float64(len(pool.workers)))
pool.metrics.ApplyWorkerSecondsHistogram.WithLabelValues(pool.name).Observe(time.Since(start).Seconds())
}
return worker
}
// Recycle puts a worker back to the pool.
func (pool *Pool) Recycle(worker *Worker) {
if worker == nil {
panic("invalid restore worker")
}
pool.workers <- worker
if pool.metrics != nil {
pool.metrics.IdleWorkersGauge.WithLabelValues(pool.name).Set(float64(len(pool.workers)))
}
}
// HasWorker returns whether the pool has worker.
func (pool *Pool) HasWorker() bool {
return len(pool.workers) > 0
}
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