78 lines
2.3 KiB
Go
78 lines
2.3 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 bindinfo
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import (
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"strconv"
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"strings"
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"testing"
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"github.com/pingcap/tidb/pkg/sessionctx/variable"
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"github.com/pingcap/tidb/pkg/util/hack"
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"github.com/stretchr/testify/require"
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)
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func TestBindCache(t *testing.T) {
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variable.MemQuotaBindingCache.Store(250)
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bindCache := newBindCache()
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value := make([]Bindings, 3)
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key := make([]bindCacheKey, 3)
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var bigKey string
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for i := 0; i < 3; i++ {
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cacheKey := strings.Repeat(strconv.Itoa(i), 50)
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key[i] = bindCacheKey(hack.Slice(cacheKey))
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value[i] = []Binding{{OriginalSQL: cacheKey}}
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bigKey += cacheKey
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require.Equal(t, int64(116), calcBindCacheKVMem(key[i], value[i]))
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}
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ok, err := bindCache.set(key[0], value[0])
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require.True(t, ok)
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require.Nil(t, err)
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result := bindCache.get(key[0])
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require.NotNil(t, result)
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ok, err = bindCache.set(key[1], value[1])
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require.True(t, ok)
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require.Nil(t, err)
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result = bindCache.get(key[1])
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require.NotNil(t, result)
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ok, err = bindCache.set(key[2], value[2])
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require.True(t, ok)
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require.NotNil(t, err) // exceed the memory limit
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result = bindCache.get(key[2])
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require.NotNil(t, result)
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// key[0] is not in the cache
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result = bindCache.get(key[0])
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require.Nil(t, result)
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// key[1] is still in the cache
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result = bindCache.get(key[1])
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require.NotNil(t, result)
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bigBindCacheKey := bindCacheKey(hack.Slice(bigKey))
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bigBindCacheValue := []Binding{{OriginalSQL: strings.Repeat("x", 100)}}
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require.Equal(t, int64(266), calcBindCacheKVMem(bigBindCacheKey, bigBindCacheValue))
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ok, err = bindCache.set(bigBindCacheKey, bigBindCacheValue)
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require.False(t, ok) // the key-value pair is too big to be cached
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require.NotNil(t, err)
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result = bindCache.get(bigBindCacheKey)
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require.Nil(t, result)
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}
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