github.com/matrixorigin/matrixone@v1.2.0/pkg/fileservice/example_test.go (about)

     1  // Copyright 2022 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package fileservice
    16  
    17  import (
    18  	"context"
    19  	"io"
    20  	"testing"
    21  
    22  	"github.com/matrixorigin/matrixone/pkg/fileservice/memorycache"
    23  	"github.com/matrixorigin/matrixone/pkg/util/toml"
    24  	"github.com/stretchr/testify/assert"
    25  )
    26  
    27  func TestCacheExample(t *testing.T) {
    28  	ctx := context.Background()
    29  
    30  	dir := t.TempDir()
    31  	fs, err := NewLocalFS(
    32  		ctx,
    33  		"rc",
    34  		dir,
    35  		CacheConfig{
    36  			MemoryCapacity: ptrTo[toml.ByteSize](32 << 20),
    37  		},
    38  		nil,
    39  	)
    40  	assert.Nil(t, err)
    41  
    42  	// write
    43  	err = fs.Write(ctx, IOVector{
    44  		FilePath: "foo",
    45  		Entries: []IOEntry{
    46  			{
    47  				Data: []byte("42"),
    48  				Size: 2,
    49  			},
    50  		},
    51  	})
    52  	assert.Nil(t, err)
    53  
    54  	// read
    55  	vec := &IOVector{
    56  		FilePath: "foo",
    57  		Entries: []IOEntry{
    58  			{
    59  				Offset: 0,
    60  				Size:   2,
    61  				ToCacheData: func(_ io.Reader, data []byte, allocator CacheDataAllocator) (memorycache.CacheData, error) {
    62  					cacheData := allocator.Alloc(len(data))
    63  					copy(cacheData.Bytes(), data)
    64  					return cacheData, nil
    65  				},
    66  			},
    67  		},
    68  	}
    69  	err = fs.Read(ctx, vec)
    70  	assert.Nil(t, err)
    71  
    72  	value := vec.Entries[0].CachedData
    73  	assert.Equal(t, []byte("42"), value.Bytes())
    74  
    75  	vec.Release()
    76  	fs.FlushCache()
    77  }