70 lines
2.6 KiB
Go
70 lines
2.6 KiB
Go
// Copyright 2023 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 pdhelper
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import (
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"context"
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"testing"
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"time"
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"github.com/jellydator/ttlcache/v3"
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"github.com/pingcap/tidb/pkg/sessionctx"
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"github.com/stretchr/testify/require"
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)
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var globalMockClient mockClient
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type mockClient struct {
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missCnt int
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}
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func (m *mockClient) getMissCnt() int {
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return m.missCnt
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}
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func (m *mockClient) getFakeApproximateTableCountFromStorage(_ context.Context, _ sessionctx.Context, _ int64, _, _, _ string) (float64, bool) {
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m.missCnt++
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return 1.0, true
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}
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func TestTTLCache(t *testing.T) {
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cache := ttlcache.New[string, float64](
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ttlcache.WithTTL[string, float64](100*time.Millisecond),
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ttlcache.WithCapacity[string, float64](2),
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)
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helper := &PDHelper{
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cacheForApproximateTableCountFromStorage: cache,
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getApproximateTableCountFromStorageFunc: globalMockClient.getFakeApproximateTableCountFromStorage,
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}
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ctx := context.Background()
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helper.GetApproximateTableCountFromStorage(ctx, nil, 1, "db", "table", "partition") // Miss
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require.Equal(t, 1, globalMockClient.getMissCnt())
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helper.GetApproximateTableCountFromStorage(ctx, nil, 1, "db", "table", "partition") // Hit
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require.Equal(t, 1, globalMockClient.getMissCnt())
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helper.GetApproximateTableCountFromStorage(ctx, nil, 2, "db1", "table1", "partition") // Miss
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require.Equal(t, 2, globalMockClient.getMissCnt())
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helper.GetApproximateTableCountFromStorage(ctx, nil, 3, "db2", "table2", "partition") // Miss
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helper.GetApproximateTableCountFromStorage(ctx, nil, 1, "db", "table", "partition") // Miss
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require.Equal(t, 4, globalMockClient.getMissCnt())
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helper.GetApproximateTableCountFromStorage(ctx, nil, 3, "db2", "table2", "partition") // Hit
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require.Equal(t, 4, globalMockClient.getMissCnt())
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time.Sleep(200 * time.Millisecond)
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// All is miss.
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helper.GetApproximateTableCountFromStorage(ctx, nil, 1, "db", "table", "partition")
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helper.GetApproximateTableCountFromStorage(ctx, nil, 2, "db1", "table1", "partition")
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helper.GetApproximateTableCountFromStorage(ctx, nil, 3, "db2", "table2", "partition")
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require.Equal(t, 7, globalMockClient.getMissCnt())
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}
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