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84 lines
1.9 KiB
84 lines
1.9 KiB
// Copyright 2014 The Macaron Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// 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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package cache
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import (
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"bytes"
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"encoding/gob"
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"errors"
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)
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func EncodeGob(item *Item) ([]byte, error) {
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buf := bytes.NewBuffer(nil)
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err := gob.NewEncoder(buf).Encode(item)
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return buf.Bytes(), err
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}
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func DecodeGob(data []byte, out *Item) error {
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buf := bytes.NewBuffer(data)
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return gob.NewDecoder(buf).Decode(&out)
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}
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func Incr(val interface{}) (interface{}, error) {
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switch val.(type) {
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case int:
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val = val.(int) + 1
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case int32:
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val = val.(int32) + 1
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case int64:
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val = val.(int64) + 1
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case uint:
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val = val.(uint) + 1
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case uint32:
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val = val.(uint32) + 1
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case uint64:
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val = val.(uint64) + 1
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default:
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return val, errors.New("item value is not int-type")
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}
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return val, nil
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}
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func Decr(val interface{}) (interface{}, error) {
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switch val.(type) {
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case int:
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val = val.(int) - 1
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case int32:
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val = val.(int32) - 1
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case int64:
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val = val.(int64) - 1
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case uint:
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if val.(uint) > 0 {
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val = val.(uint) - 1
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} else {
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return val, errors.New("item value is less than 0")
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}
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case uint32:
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if val.(uint32) > 0 {
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val = val.(uint32) - 1
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} else {
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return val, errors.New("item value is less than 0")
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}
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case uint64:
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if val.(uint64) > 0 {
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val = val.(uint64) - 1
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} else {
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return val, errors.New("item value is less than 0")
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}
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default:
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return val, errors.New("item value is not int-type")
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}
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return val, nil
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}
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