88 lines
1.9 KiB
Go
88 lines
1.9 KiB
Go
// Copyright 2021 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 membuf
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import (
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"crypto/rand"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func init() {
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allocBufLen = 1024
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}
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type testAllocator struct {
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allocs int
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frees int
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}
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func (t *testAllocator) Alloc(n int) []byte {
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t.allocs++
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return make([]byte, n)
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}
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func (t *testAllocator) Free(_ []byte) {
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t.frees++
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}
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func TestBufferPool(t *testing.T) {
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t.Parallel()
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allocator := &testAllocator{}
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pool := NewPool(2, allocator)
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bytesBuf := pool.NewBuffer()
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bytesBuf.AllocBytes(256)
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require.Equal(t, 1, allocator.allocs)
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bytesBuf.AllocBytes(512)
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require.Equal(t, 1, allocator.allocs)
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bytesBuf.AllocBytes(257)
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require.Equal(t, 2, allocator.allocs)
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bytesBuf.AllocBytes(767)
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require.Equal(t, 2, allocator.allocs)
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require.Equal(t, 0, allocator.frees)
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bytesBuf.Destroy()
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require.Equal(t, 0, allocator.frees)
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bytesBuf = pool.NewBuffer()
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for i := 0; i < 6; i++ {
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bytesBuf.AllocBytes(512)
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}
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bytesBuf.Destroy()
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require.Equal(t, 3, allocator.allocs)
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require.Equal(t, 1, allocator.frees)
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}
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func TestBufferIsolation(t *testing.T) {
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t.Parallel()
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bytesBuf := NewBuffer()
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defer bytesBuf.Destroy()
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b1 := bytesBuf.AllocBytes(16)
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b2 := bytesBuf.AllocBytes(16)
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require.Equal(t, len(b1), cap(b1))
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require.Equal(t, len(b2), cap(b2))
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_, err := rand.Read(b2)
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require.NoError(t, err)
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b3 := append([]byte(nil), b2...)
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b1 = append(b1, 0, 1, 2, 3)
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require.Equal(t, b3, b2)
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}
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