57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
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// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package store
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import (
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"encoding/binary"
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"testing"
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)
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type addUint64Operator struct {
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offset uint64
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}
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func newAddUint64Operator(offset uint64) *addUint64Operator {
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return &addUint64Operator{offset: offset}
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}
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func (a *addUint64Operator) Merge(key, existing []byte) ([]byte, error) {
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var existingUint64 uint64
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if len(existing) > 0 {
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existingUint64, _ = binary.Uvarint(existing)
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}
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existingUint64 += a.offset
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result := make([]byte, 8)
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binary.PutUvarint(result, existingUint64)
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return result, nil
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}
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func TestAssociativeMerge(t *testing.T) {
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// simulate original lookup of value
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existingValue := make([]byte, 8)
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binary.PutUvarint(existingValue, 27)
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mergeChain := make(AssociativeMergeChain, 0)
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mergeChain = append(mergeChain, newAddUint64Operator(6))
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mergeChain = append(mergeChain, newAddUint64Operator(3))
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mergeChain = append(mergeChain, newAddUint64Operator(25))
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mergeChain = append(mergeChain, newAddUint64Operator(1))
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newValueBytes, err := mergeChain.Merge([]byte("key"), existingValue)
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if err != nil {
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t.Fatal(err)
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}
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newValue, _ := binary.Uvarint(newValueBytes)
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if newValue != 62 {
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t.Errorf("expected 62, got %d", newValue)
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}
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}
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