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package pool
import (
"sync"
)
type Reader interface {
Buffered() int
Bytes() []byte
Read([]byte) (int, error)
ReadByte() (byte, error)
UnreadByte() error
ReadSlice(byte) ([]byte, error)
Discard(int) (int, error)
// ReadBytes(fn func(byte) bool) ([]byte, error)
// ReadN(int) ([]byte, error)
ReadFull() ([]byte, error)
ReadFullTemp() ([]byte, error)
}
type ColumnInfo struct {
Index int16
DataType int32
Name string
}
type ColumnAlloc struct {
columns []ColumnInfo
}
func NewColumnAlloc() *ColumnAlloc {
return new(ColumnAlloc)
}
func (c *ColumnAlloc) Reset() {
c.columns = c.columns[:0]
}
func (c *ColumnAlloc) New(index int16, name []byte) *ColumnInfo {
c.columns = append(c.columns, ColumnInfo{
Index: index,
Name: string(name),
})
return &c.columns[len(c.columns)-1]
}
func (c *ColumnAlloc) Columns() []ColumnInfo {
return c.columns
}
type ReaderContext struct {
*BufReader
ColumnAlloc *ColumnAlloc
}
func NewReaderContext() *ReaderContext {
const bufSize = 1 << 20 // 1mb
return &ReaderContext{
BufReader: NewBufReader(bufSize),
ColumnAlloc: NewColumnAlloc(),
}
}
var readerPool = sync.Pool{
New: func() interface{} {
return NewReaderContext()
},
}
func GetReaderContext() *ReaderContext {
rd := readerPool.Get().(*ReaderContext)
return rd
}
func PutReaderContext(rd *ReaderContext) {
rd.ColumnAlloc.Reset()
readerPool.Put(rd)
}
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