/
pagedmutable.go
171 lines (144 loc) · 4.07 KB
/
pagedmutable.go
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package packed
type PagedMutable interface {
Get(index int) (uint64, error)
GetTest(index int) uint64
Set(index int, value uint64)
Resize(newSize int) PagedMutable
Grow(minSize int) PagedMutable
GrowOne() PagedMutable
SubMutables() []Mutable
GetSubMutableByIndex(index int) Mutable
SetSubMutableByIndex(index int, value Mutable)
}
// basePagedMutable
// Base implementation for FixSizePagedMutable and PagedGrowableWriter.
// lucene.internal
type basePagedMutable struct {
spi PagedMutableBuilder
size int
pageShift int
pageMask int
subMutables []Mutable
bitsPerValue int
}
func newPagedMutable(spi PagedMutableBuilder, bitsPerValue, size, pageSize int) (*basePagedMutable, error) {
m := &basePagedMutable{
spi: spi,
bitsPerValue: bitsPerValue,
size: size,
pageShift: checkBlockSize(pageSize, MIN_BLOCK_SIZE, MAX_BLOCK_SIZE),
pageMask: pageSize - 1,
}
numPages, err := getNumBlocks(size, pageSize)
if err != nil {
return nil, err
}
m.subMutables = make([]Mutable, numPages)
return m, nil
}
type PagedMutableBuilder interface {
NewMutable(valueCount, bitsPerValue int) Mutable
NewUnfilledCopy(newSize int) (PagedMutable, error)
}
const (
MIN_BLOCK_SIZE = 1 << 6
MAX_BLOCK_SIZE = 1 << 30
)
func (a *basePagedMutable) fillPages() error {
numPages, err := getNumBlocks(a.size, a.pageSize())
if err != nil {
return err
}
for i := 0; i < numPages; i++ {
valueCount := a.pageSize()
if i == numPages-1 {
// do not allocate for more entries than necessary on the last page
valueCount = a.lastPageSize(a.size)
}
a.subMutables[i] = a.spi.NewMutable(valueCount, a.bitsPerValue)
}
return nil
}
func (a *basePagedMutable) lastPageSize(size int) int {
sz := a.indexInPage(size)
if sz == 0 {
return a.pageSize()
}
return sz
}
func (a *basePagedMutable) pageSize() int {
return a.pageMask + 1
}
func (a *basePagedMutable) Size() int {
return a.size
}
func (a *basePagedMutable) pageIndex(index int) int {
return index >> a.pageShift
}
func (a *basePagedMutable) indexInPage(index int) int {
return index & a.pageMask
}
func (a *basePagedMutable) Get(index int) (uint64, error) {
pageIndex := a.pageIndex(index)
indexInPage := a.indexInPage(index)
return a.subMutables[pageIndex].Get(indexInPage)
}
func (a *basePagedMutable) GetTest(index int) uint64 {
v, _ := a.Get(index)
return v
}
func (a *basePagedMutable) Set(index int, value uint64) {
pageIndex := a.pageIndex(index)
indexInPage := a.indexInPage(index)
a.subMutables[pageIndex].Set(indexInPage, value)
}
func (a *basePagedMutable) SubMutables() []Mutable {
return a.subMutables
}
func (a *basePagedMutable) GetSubMutableByIndex(index int) Mutable {
return a.subMutables[index]
}
func (a *basePagedMutable) SetSubMutableByIndex(index int, value Mutable) {
a.subMutables[index] = value
}
// Resize
// Create a new copy of size newSize based on the content of this buffer.
// This method is much more efficient than creating a new instance and copying values one by one.
func (a *basePagedMutable) Resize(newSize int) PagedMutable {
ucopy, _ := a.spi.NewUnfilledCopy(newSize)
numCommonPages := min(len(ucopy.SubMutables()), len(a.subMutables))
copyBuffer := make([]uint64, 1024)
size := len(ucopy.SubMutables())
subMutables := ucopy.SubMutables()
for i := range subMutables {
valueCount := a.pageSize()
if i < size-1 {
valueCount = a.lastPageSize(newSize)
}
bpv := a.bitsPerValue
if i < numCommonPages {
bpv = a.subMutables[i].GetBitsPerValue()
}
ucopy.SetSubMutableByIndex(i, a.spi.NewMutable(valueCount, bpv))
if i < numCommonPages {
copyLength := min(valueCount, a.subMutables[i].Size())
CopyValuesWithBuffer(a.subMutables[i], 0, subMutables[i], 0, copyLength, copyBuffer)
}
}
return ucopy
}
func (a *basePagedMutable) Grow(minSize int) PagedMutable {
if minSize <= a.Size() {
return a
}
extra := minSize >> 3
if extra < 3 {
extra = 3
}
newSize := minSize + extra
return a.Resize(newSize)
}
// GrowOne Similar to ArrayUtil.grow(long[]).
func (a *basePagedMutable) GrowOne() PagedMutable {
return a.Grow(a.Size() + 1)
}