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// Copyright (c) 2014 Couchbase, 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test
import (
"encoding/binary"
"testing"
"github.com/blevesearch/bleve/index/store"
)
// test merge behavior
func encodeUint64(in uint64) []byte {
rv := make([]byte, 8)
binary.LittleEndian.PutUint64(rv, in)
return rv
}
func CommonTestMerge(t *testing.T, s store.KVStore) {
testKey := []byte("k1")
data := []struct {
key []byte
val []byte
}{
{testKey, encodeUint64(1)},
{testKey, encodeUint64(1)},
}
// open a writer
writer, err := s.Writer()
if err != nil {
t.Fatal(err)
}
// write the data
batch := writer.NewBatch()
for _, row := range data {
batch.Merge(row.key, row.val)
}
err = writer.ExecuteBatch(batch)
if err != nil {
t.Fatal(err)
}
// close the writer
err = writer.Close()
if err != nil {
t.Fatal(err)
}
// open a reader
reader, err := s.Reader()
if err != nil {
t.Fatal(err)
}
// read key
returnedVal, err := reader.Get(testKey)
if err != nil {
t.Fatal(err)
}
// check the value
mergedval := binary.LittleEndian.Uint64(returnedVal)
if mergedval != 2 {
t.Errorf("expected 2, got %d", mergedval)
}
// close the reader
err = reader.Close()
if err != nil {
t.Fatal(err)
}
}
// a test merge operator which is just an incrementing counter of uint64
type TestMergeCounter struct{}
func (mc *TestMergeCounter) FullMerge(key, existingValue []byte, operands [][]byte) ([]byte, bool) {
var newval uint64
if len(existingValue) > 0 {
newval = binary.LittleEndian.Uint64(existingValue)
}
// now process operands
for _, operand := range operands {
next := binary.LittleEndian.Uint64(operand)
newval += next
}
rv := make([]byte, 8)
binary.LittleEndian.PutUint64(rv, newval)
return rv, true
}
func (mc *TestMergeCounter) PartialMerge(key, leftOperand, rightOperand []byte) ([]byte, bool) {
left := binary.LittleEndian.Uint64(leftOperand)
right := binary.LittleEndian.Uint64(rightOperand)
rv := make([]byte, 8)
binary.LittleEndian.PutUint64(rv, left+right)
return rv, true
}
func (mc *TestMergeCounter) Name() string {
return "test_merge_counter"
}
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