90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// Copyright 2022 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 ddl
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import (
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"github.com/ngaut/pools"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/pkg/ddl/logutil"
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"go.uber.org/atomic"
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)
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// workerPool is used to new worker.
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type workerPool struct {
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t jobType
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exit atomic.Bool
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resPool *pools.ResourcePool
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}
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func newDDLWorkerPool(resPool *pools.ResourcePool, tp jobType) *workerPool {
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return &workerPool{
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t: tp,
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exit: *atomic.NewBool(false),
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resPool: resPool,
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}
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}
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// get gets workerPool from context resource pool.
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// Please remember to call put after you finished using workerPool.
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func (wp *workerPool) get() (*worker, error) {
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if wp.exit.Load() {
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return nil, errors.Errorf("workerPool is closed")
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}
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// no need to protect wp.resPool
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resource, err := wp.resPool.TryGet()
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if err != nil {
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return nil, errors.Trace(err)
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}
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if resource == nil {
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return nil, nil
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}
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worker := resource.(*worker)
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return worker, nil
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}
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// put returns workerPool to context resource pool.
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func (wp *workerPool) put(wk *worker) {
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if wp.exit.Load() {
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return
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}
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// no need to protect wp.resPool, even the wp.resPool is closed, the ctx still need to
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// put into resPool, because when resPool is closing, it will wait all the ctx returns, then resPool finish closing.
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wp.resPool.Put(wk)
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}
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// close clean up the workerPool.
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func (wp *workerPool) close() {
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// prevent closing resPool twice.
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if wp.exit.Load() {
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return
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}
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wp.exit.Store(true)
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logutil.DDLLogger().Info("closing workerPool")
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wp.resPool.Close()
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}
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// tp return the type of backfill worker pool.
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func (wp *workerPool) tp() jobType {
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return wp.t
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}
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func (wp *workerPool) available() int {
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return int(wp.resPool.Available())
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}
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