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// Copyright 2017 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 handle
import (
. "github.com/pingcap/check"
"github.com/pingcap/tidb/statistics"
)
var _ = Suite(&testUpdateListSuite{})
type testUpdateListSuite struct {
}
func (s *testUpdateListSuite) TestInsertAndDelete(c *C) {
h := Handle{
listHead: &SessionStatsCollector{mapper: make(tableDeltaMap)},
feedback: statistics.NewQueryFeedbackMap(),
}
var items []*SessionStatsCollector
for i := 0; i < 5; i++ {
items = append(items, h.NewSessionStatsCollector())
}
items[0].Delete() // delete tail
items[2].Delete() // delete middle
items[4].Delete() // delete head
h.sweepList()
c.Assert(h.listHead.next, Equals, items[3])
c.Assert(items[3].next, Equals, items[1])
c.Assert(items[1].next, IsNil)
// delete rest
items[1].Delete()
items[3].Delete()
h.sweepList()
c.Assert(h.listHead.next, IsNil)
}