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session_pool.go
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session_pool.go
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// Copyright 2018 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package ddl
import (
"sync"
"github.com/hanchuanchuan/goInception/mysql"
"github.com/hanchuanchuan/goInception/sessionctx"
"github.com/hanchuanchuan/goInception/util/mock"
"github.com/ngaut/pools"
"github.com/pingcap/errors"
)
// sessionPool is used to new session.
type sessionPool struct {
mu sync.Mutex
resPool *pools.ResourcePool
}
// get gets sessionctx from context resource pool.
// Please remember to call put after you finished using sessionctx.
func (sg *sessionPool) get() (sessionctx.Context, error) {
if sg.resPool == nil {
return mock.NewContext(), nil
}
resource, err := sg.resPool.Get()
if err != nil {
return nil, errors.Trace(err)
}
ctx := resource.(sessionctx.Context)
ctx.GetSessionVars().SetStatusFlag(mysql.ServerStatusAutocommit, true)
ctx.GetSessionVars().InRestrictedSQL = true
return ctx, nil
}
// put returns sessionctx to context resource pool.
func (sg *sessionPool) put(ctx sessionctx.Context) {
if sg.resPool == nil {
return
}
sg.resPool.Put(ctx.(pools.Resource))
}
// close clean up the sessionPool.
func (sg *sessionPool) close() {
sg.mu.Lock()
defer sg.mu.Unlock()
if sg.resPool == nil {
return
}
sg.resPool.Close()
sg.resPool = nil
}