/
lazy_list.go
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/
lazy_list.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package binary
import (
"sync"
"go.uber.org/thriftrw/wire"
)
var (
lazyValueListPool = sync.Pool{New: func() interface{} {
return &lazyValueList{}
}}
lazyMapItemListPool = sync.Pool{New: func() interface{} {
return &lazyMapItemList{}
}}
)
func borrowLazyValueList() *lazyValueList {
return lazyValueListPool.Get().(*lazyValueList)
}
func borrowLazyMapItemList() *lazyMapItemList {
return lazyMapItemListPool.Get().(*lazyMapItemList)
}
// lazyValueList is an implementation of ValueList which parses Values from a
// Reader on-demand.
type lazyValueList struct {
count int32
typ wire.Type
reader *Reader
startOffset int64
}
func (ll *lazyValueList) ValueType() wire.Type {
return ll.typ
}
func (ll *lazyValueList) Size() int {
return int(ll.count)
}
func (ll *lazyValueList) ForEach(f func(wire.Value) error) error {
off := ll.startOffset
for i := int32(0); i < ll.count; i++ {
var (
val wire.Value
err error
)
val, off, err = ll.reader.ReadValue(ll.typ, off)
if err != nil {
return err
}
if err := f(val); err != nil {
return err
}
}
return nil
}
func (ll *lazyValueList) Close() {
ll.reader = nil
lazyValueListPool.Put(ll)
}
// lazyMapItemList is an implementation of MapItemList which parses MapItems
// from a Reader on-demand.
type lazyMapItemList struct {
ktype, vtype wire.Type
count int32
reader *Reader
startOffset int64
}
func (lm *lazyMapItemList) KeyType() wire.Type {
return lm.ktype
}
func (lm *lazyMapItemList) ValueType() wire.Type {
return lm.vtype
}
func (lm *lazyMapItemList) Size() int {
return int(lm.count)
}
func (lm *lazyMapItemList) ForEach(f func(wire.MapItem) error) error {
off := lm.startOffset
for i := int32(0); i < lm.count; i++ {
var (
k, v wire.Value
err error
)
k, off, err = lm.reader.ReadValue(lm.ktype, off)
if err != nil {
return err
}
v, off, err = lm.reader.ReadValue(lm.vtype, off)
if err != nil {
return err
}
item := wire.MapItem{Key: k, Value: v}
if err := f(item); err != nil {
return err
}
}
return nil
}
func (lm *lazyMapItemList) Close() {
lm.reader = nil
lazyMapItemListPool.Put(lm)
}